/* * Kernel-based Virtual Machine driver for Linux * * derived from drivers/kvm/kvm_main.c * * Copyright (C) 2006 Qumranet, Inc. * Copyright (C) 2008 Qumranet, Inc. * Copyright IBM Corporation, 2008 * * Authors: * Avi Kivity * Yaniv Kamay * Amit Shah * Ben-Ami Yassour * * This work is licensed under the terms of the GNU GPL, version 2. See * the COPYING file in the top-level directory. * */ #include #include "irq.h" #include "mmu.h" #include "i8254.h" #include "tss.h" #include "kvm_cache_regs.h" #include "x86.h" #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #undef TRACE_INCLUDE_FILE #define CREATE_TRACE_POINTS #include "trace.h" #include #include #include #include #include #include #define MAX_IO_MSRS 256 #define CR0_RESERVED_BITS \ (~(unsigned long)(X86_CR0_PE | X86_CR0_MP | X86_CR0_EM | X86_CR0_TS \ | X86_CR0_ET | X86_CR0_NE | X86_CR0_WP | X86_CR0_AM \ | X86_CR0_NW | X86_CR0_CD | X86_CR0_PG)) #define CR4_RESERVED_BITS \ (~(unsigned long)(X86_CR4_VME | X86_CR4_PVI | X86_CR4_TSD | X86_CR4_DE\ | X86_CR4_PSE | X86_CR4_PAE | X86_CR4_MCE \ | X86_CR4_PGE | X86_CR4_PCE | X86_CR4_OSFXSR \ | X86_CR4_OSXMMEXCPT | X86_CR4_VMXE)) #define CR8_RESERVED_BITS (~(unsigned long)X86_CR8_TPR) #define KVM_MAX_MCE_BANKS 32 #define KVM_MCE_CAP_SUPPORTED MCG_CTL_P /* EFER defaults: * - enable syscall per default because its emulated by KVM * - enable LME and LMA per default on 64 bit KVM */ #ifdef CONFIG_X86_64 static u64 __read_mostly efer_reserved_bits = 0xfffffffffffffafeULL; #else static u64 __read_mostly efer_reserved_bits = 0xfffffffffffffffeULL; #endif #define VM_STAT(x) offsetof(struct kvm, stat.x), KVM_STAT_VM #define VCPU_STAT(x) offsetof(struct kvm_vcpu, stat.x), KVM_STAT_VCPU static void update_cr8_intercept(struct kvm_vcpu *vcpu); static int kvm_dev_ioctl_get_supported_cpuid(struct kvm_cpuid2 *cpuid, struct kvm_cpuid_entry2 __user *entries); struct kvm_x86_ops *kvm_x86_ops; EXPORT_SYMBOL_GPL(kvm_x86_ops); int ignore_msrs = 0; module_param_named(ignore_msrs, ignore_msrs, bool, S_IRUGO | S_IWUSR); #define KVM_NR_SHARED_MSRS 16 struct kvm_shared_msrs_global { int nr; u32 msrs[KVM_NR_SHARED_MSRS]; }; struct kvm_shared_msrs { struct user_return_notifier urn; bool registered; struct kvm_shared_msr_values { u64 host; u64 curr; } values[KVM_NR_SHARED_MSRS]; }; static struct kvm_shared_msrs_global __read_mostly shared_msrs_global; static DEFINE_PER_CPU(struct kvm_shared_msrs, shared_msrs); struct kvm_stats_debugfs_item debugfs_entries[] = { { "pf_fixed", VCPU_STAT(pf_fixed) }, { "pf_guest", VCPU_STAT(pf_guest) }, { "tlb_flush", VCPU_STAT(tlb_flush) }, { "invlpg", VCPU_STAT(invlpg) }, { "exits", VCPU_STAT(exits) }, { "io_exits", VCPU_STAT(io_exits) }, { "mmio_exits", VCPU_STAT(mmio_exits) }, { "signal_exits", VCPU_STAT(signal_exits) }, { "irq_window", VCPU_STAT(irq_window_exits) }, { "nmi_window", VCPU_STAT(nmi_window_exits) }, { "halt_exits", VCPU_STAT(halt_exits) }, { "halt_wakeup", VCPU_STAT(halt_wakeup) }, { "hypercalls", VCPU_STAT(hypercalls) }, { "request_irq", VCPU_STAT(request_irq_exits) }, { "irq_exits", VCPU_STAT(irq_exits) }, { "host_state_reload", VCPU_STAT(host_state_reload) }, { "efer_reload", VCPU_STAT(efer_reload) }, { "fpu_reload", VCPU_STAT(fpu_reload) }, { "insn_emulation", VCPU_STAT(insn_emulation) }, { "insn_emulation_fail", VCPU_STAT(insn_emulation_fail) }, { "irq_injections", VCPU_STAT(irq_injections) }, { "nmi_injections", VCPU_STAT(nmi_injections) }, { "mmu_shadow_zapped", VM_STAT(mmu_shadow_zapped) }, { "mmu_pte_write", VM_STAT(mmu_pte_write) }, { "mmu_pte_updated", VM_STAT(mmu_pte_updated) }, { "mmu_pde_zapped", VM_STAT(mmu_pde_zapped) }, { "mmu_flooded", VM_STAT(mmu_flooded) }, { "mmu_recycled", VM_STAT(mmu_recycled) }, { "mmu_cache_miss", VM_STAT(mmu_cache_miss) }, { "mmu_unsync", VM_STAT(mmu_unsync) }, { "remote_tlb_flush", VM_STAT(remote_tlb_flush) }, { "largepages", VM_STAT(lpages) }, { NULL } }; static void kvm_on_user_return(struct user_return_notifier *urn) { unsigned slot; struct kvm_shared_msrs *locals = container_of(urn, struct kvm_shared_msrs, urn); struct kvm_shared_msr_values *values; for (slot = 0; slot < shared_msrs_global.nr; ++slot) { values = &locals->values[slot]; if (values->host != values->curr) { wrmsrl(shared_msrs_global.msrs[slot], values->host); values->curr = values->host; } } locals->registered = false; user_return_notifier_unregister(urn); } static void shared_msr_update(unsigned slot, u32 msr) { struct kvm_shared_msrs *smsr; u64 value; smsr = &__get_cpu_var(shared_msrs); /* only read, and nobody should modify it at this time, * so don't need lock */ if (slot >= shared_msrs_global.nr) { printk(KERN_ERR "kvm: invalid MSR slot!"); return; } rdmsrl_safe(msr, &value); smsr->values[slot].host = value; smsr->values[slot].curr = value; } void kvm_define_shared_msr(unsigned slot, u32 msr) { if (slot >= shared_msrs_global.nr) shared_msrs_global.nr = slot + 1; shared_msrs_global.msrs[slot] = msr; /* we need ensured the shared_msr_global have been updated */ smp_wmb(); } EXPORT_SYMBOL_GPL(kvm_define_shared_msr); static void kvm_shared_msr_cpu_online(void) { unsigned i; for (i = 0; i < shared_msrs_global.nr; ++i) shared_msr_update(i, shared_msrs_global.msrs[i]); } void kvm_set_shared_msr(unsigned slot, u64 value, u64 mask) { struct kvm_shared_msrs *smsr = &__get_cpu_var(shared_msrs); if (((value ^ smsr->values[slot].curr) & mask) == 0) return; smsr->values[slot].curr = value; wrmsrl(shared_msrs_global.msrs[slot], value); if (!smsr->registered) { smsr->urn.on_user_return = kvm_on_user_return; user_return_notifier_register(&smsr->urn); smsr->registered = true; } } EXPORT_SYMBOL_GPL(kvm_set_shared_msr); static void drop_user_return_notifiers(void *ignore) { struct kvm_shared_msrs *smsr = &__get_cpu_var(shared_msrs); if (smsr->registered) kvm_on_user_return(&smsr->urn); } unsigned long segment_base(u16 selector) { struct desc_ptr gdt; struct desc_struct *d; unsigned long table_base; unsigned long v; if (selector == 0) return 0; kvm_get_gdt(&gdt); table_base = gdt.address; if (selector & 4) { /* from ldt */ u16 ldt_selector = kvm_read_ldt(); table_base = segment_base(ldt_selector); } d = (struct desc_struct *)(table_base + (selector & ~7)); v = get_desc_base(d); #ifdef CONFIG_X86_64 if (d->s == 0 && (d->type == 2 || d->type == 9 || d->type == 11)) v |= ((unsigned long)((struct ldttss_desc64 *)d)->base3) << 32; #endif return v; } EXPORT_SYMBOL_GPL(segment_base); u64 kvm_get_apic_base(struct kvm_vcpu *vcpu) { if (irqchip_in_kernel(vcpu->kvm)) return vcpu->arch.apic_base; else return vcpu->arch.apic_base; } EXPORT_SYMBOL_GPL(kvm_get_apic_base); void kvm_set_apic_base(struct kvm_vcpu *vcpu, u64 data) { /* TODO: reserve bits check */ if (irqchip_in_kernel(vcpu->kvm)) kvm_lapic_set_base(vcpu, data); else vcpu->arch.apic_base = data; } EXPORT_SYMBOL_GPL(kvm_set_apic_base); #define EXCPT_BENIGN 0 #define EXCPT_CONTRIBUTORY 1 #define EXCPT_PF 2 static int exception_class(int vector) { switch (vector) { case PF_VECTOR: return EXCPT_PF; case DE_VECTOR: case TS_VECTOR: case NP_VECTOR: case SS_VECTOR: case GP_VECTOR: return EXCPT_CONTRIBUTORY; default: break; } return EXCPT_BENIGN; } static void kvm_multiple_exception(struct kvm_vcpu *vcpu, unsigned nr, bool has_error, u32 error_code) { u32 prev_nr; int class1, class2; if (!vcpu->arch.exception.pending) { queue: vcpu->arch.exception.pending = true; vcpu->arch.exception.has_error_code = has_error; vcpu->arch.exception.nr = nr; vcpu->arch.exception.error_code = error_code; return; } /* to check exception */ prev_nr = vcpu->arch.exception.nr; if (prev_nr == DF_VECTOR) { /* triple fault -> shutdown */ set_bit(KVM_REQ_TRIPLE_FAULT, &vcpu->requests); return; } class1 = exception_class(prev_nr); class2 = exception_class(nr); if ((class1 == EXCPT_CONTRIBUTORY && class2 == EXCPT_CONTRIBUTORY) || (class1 == EXCPT_PF && class2 != EXCPT_BENIGN)) { /* generate double fault per SDM Table 5-5 */ vcpu->arch.exception.pending = true; vcpu->arch.exception.has_error_code = true; vcpu->arch.exception.nr = DF_VECTOR; vcpu->arch.exception.error_code = 0; } else /* replace previous exception with a new one in a hope that instruction re-execution will regenerate lost exception */ goto queue; } void kvm_queue_exception(struct kvm_vcpu *vcpu, unsigned nr) { kvm_multiple_exception(vcpu, nr, false, 0); } EXPORT_SYMBOL_GPL(kvm_queue_exception); void kvm_inject_page_fault(struct kvm_vcpu *vcpu, unsigned long addr, u32 error_code) { ++vcpu->stat.pf_guest; vcpu->arch.cr2 = addr; kvm_queue_exception_e(vcpu, PF_VECTOR, error_code); } void kvm_inject_nmi(struct kvm_vcpu *vcpu) { vcpu->arch.nmi_pending = 1; } EXPORT_SYMBOL_GPL(kvm_inject_nmi); void kvm_queue_exception_e(struct kvm_vcpu *vcpu, unsigned nr, u32 error_code) { kvm_multiple_exception(vcpu, nr, true, error_code); } EXPORT_SYMBOL_GPL(kvm_queue_exception_e); /* * Checks if cpl <= required_cpl; if true, return true. Otherwise queue * a #GP and return false. */ bool kvm_require_cpl(struct kvm_vcpu *vcpu, int required_cpl) { if (kvm_x86_ops->get_cpl(vcpu) <= required_cpl) return true; kvm_queue_exception_e(vcpu, GP_VECTOR, 0); return false; } EXPORT_SYMBOL_GPL(kvm_require_cpl); /* * Load the pae pdptrs. Return true is they are all valid. */ int load_pdptrs(struct kvm_vcpu *vcpu, unsigned long cr3) { gfn_t pdpt_gfn = cr3 >> PAGE_SHIFT; unsigned offset = ((cr3 & (PAGE_SIZE-1)) >> 5) << 2; int i; int ret; u64 pdpte[ARRAY_SIZE(vcpu->arch.pdptrs)]; ret = kvm_read_guest_page(vcpu->kvm, pdpt_gfn, pdpte, offset * sizeof(u64), sizeof(pdpte)); if (ret < 0) { ret = 0; goto out; } for (i = 0; i < ARRAY_SIZE(pdpte); ++i) { if (is_present_gpte(pdpte[i]) && (pdpte[i] & vcpu->arch.mmu.rsvd_bits_mask[0][2])) { ret = 0; goto out; } } ret = 1; memcpy(vcpu->arch.pdptrs, pdpte, sizeof(vcpu->arch.pdptrs)); __set_bit(VCPU_EXREG_PDPTR, (unsigned long *)&vcpu->arch.regs_avail); __set_bit(VCPU_EXREG_PDPTR, (unsigned long *)&vcpu->arch.regs_dirty); out: return ret; } EXPORT_SYMBOL_GPL(load_pdptrs); static bool pdptrs_changed(struct kvm_vcpu *vcpu) { u64 pdpte[ARRAY_SIZE(vcpu->arch.pdptrs)]; bool changed = true; int r; if (is_long_mode(vcpu) || !is_pae(vcpu)) return false; if (!test_bit(VCPU_EXREG_PDPTR, (unsigned long *)&vcpu->arch.regs_avail)) return true; r = kvm_read_guest(vcpu->kvm, vcpu->arch.cr3 & ~31u, pdpte, sizeof(pdpte)); if (r < 0) goto out; changed = memcmp(pdpte, vcpu->arch.pdptrs, sizeof(pdpte)) != 0; out: return changed; } void kvm_set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0) { cr0 |= X86_CR0_ET; #ifdef CONFIG_X86_64 if (cr0 & 0xffffffff00000000UL) { kvm_inject_gp(vcpu, 0); return; } #endif cr0 &= ~CR0_RESERVED_BITS; if ((cr0 & X86_CR0_NW) && !(cr0 & X86_CR0_CD)) { kvm_inject_gp(vcpu, 0); return; } if ((cr0 & X86_CR0_PG) && !(cr0 & X86_CR0_PE)) { kvm_inject_gp(vcpu, 0); return; } if (!is_paging(vcpu) && (cr0 & X86_CR0_PG)) { #ifdef CONFIG_X86_64 if ((vcpu->arch.efer & EFER_LME)) { int cs_db, cs_l; if (!is_pae(vcpu)) { kvm_inject_gp(vcpu, 0); return; } kvm_x86_ops->get_cs_db_l_bits(vcpu, &cs_db, &cs_l); if (cs_l) { kvm_inject_gp(vcpu, 0); return; } } else #endif if (is_pae(vcpu) && !load_pdptrs(vcpu, vcpu->arch.cr3)) { kvm_inject_gp(vcpu, 0); return; } } kvm_x86_ops->set_cr0(vcpu, cr0); vcpu->arch.cr0 = cr0; kvm_mmu_reset_context(vcpu); return; } EXPORT_SYMBOL_GPL(kvm_set_cr0); void kvm_lmsw(struct kvm_vcpu *vcpu, unsigned long msw) { kvm_set_cr0(vcpu, kvm_read_cr0_bits(vcpu, ~0x0ful) | (msw & 0x0f)); } EXPORT_SYMBOL_GPL(kvm_lmsw); void kvm_set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4) { unsigned long old_cr4 = kvm_read_cr4(vcpu); unsigned long pdptr_bits = X86_CR4_PGE | X86_CR4_PSE | X86_CR4_PAE; if (cr4 & CR4_RESERVED_BITS) { kvm_inject_gp(vcpu, 0); return; } if (is_long_mode(vcpu)) { if (!(cr4 & X86_CR4_PAE)) { kvm_inject_gp(vcpu, 0); return; } } else if (is_paging(vcpu) && (cr4 & X86_CR4_PAE) && ((cr4 ^ old_cr4) & pdptr_bits) && !load_pdptrs(vcpu, vcpu->arch.cr3)) { kvm_inject_gp(vcpu, 0); return; } if (cr4 & X86_CR4_VMXE) { kvm_inject_gp(vcpu, 0); return; } kvm_x86_ops->set_cr4(vcpu, cr4); vcpu->arch.cr4 = cr4; vcpu->arch.mmu.base_role.cr4_pge = (cr4 & X86_CR4_PGE) && !tdp_enabled; kvm_mmu_reset_context(vcpu); } EXPORT_SYMBOL_GPL(kvm_set_cr4); void kvm_set_cr3(struct kvm_vcpu *vcpu, unsigned long cr3) { if (cr3 == vcpu->arch.cr3 && !pdptrs_changed(vcpu)) { kvm_mmu_sync_roots(vcpu); kvm_mmu_flush_tlb(vcpu); return; } if (is_long_mode(vcpu)) { if (cr3 & CR3_L_MODE_RESERVED_BITS) { kvm_inject_gp(vcpu, 0); return; } } else { if (is_pae(vcpu)) { if (cr3 & CR3_PAE_RESERVED_BITS) { kvm_inject_gp(vcpu, 0); return; } if (is_paging(vcpu) && !load_pdptrs(vcpu, cr3)) { kvm_inject_gp(vcpu, 0); return; } } /* * We don't check reserved bits in nonpae mode, because * this isn't enforced, and VMware depends on this. */ } /* * Does the new cr3 value map to physical memory? (Note, we * catch an invalid cr3 even in real-mode, because it would * cause trouble later on when we turn on paging anyway.) * * A real CPU would silently accept an invalid cr3 and would * attempt to use it - with largely undefined (and often hard * to debug) behavior on the guest side. */ if (unlikely(!gfn_to_memslot(vcpu->kvm, cr3 >> PAGE_SHIFT))) kvm_inject_gp(vcpu, 0); else { vcpu->arch.cr3 = cr3; vcpu->arch.mmu.new_cr3(vcpu); } } EXPORT_SYMBOL_GPL(kvm_set_cr3); void kvm_set_cr8(struct kvm_vcpu *vcpu, unsigned long cr8) { if (cr8 & CR8_RESERVED_BITS) { kvm_inject_gp(vcpu, 0); return; } if (irqchip_in_kernel(vcpu->kvm)) kvm_lapic_set_tpr(vcpu, cr8); else vcpu->arch.cr8 = cr8; } EXPORT_SYMBOL_GPL(kvm_set_cr8); unsigned long kvm_get_cr8(struct kvm_vcpu *vcpu) { if (irqchip_in_kernel(vcpu->kvm)) return kvm_lapic_get_cr8(vcpu); else return vcpu->arch.cr8; } EXPORT_SYMBOL_GPL(kvm_get_cr8); static inline u32 bit(int bitno) { return 1 << (bitno & 31); } /* * List of msr numbers which we expose to userspace through KVM_GET_MSRS * and KVM_SET_MSRS, and KVM_GET_MSR_INDEX_LIST. * * This list is modified at module load time to reflect the * capabilities of the host cpu. This capabilities test skips MSRs that are * kvm-specific. Those are put in the beginning of the list. */ #define KVM_SAVE_MSRS_BEGIN 5 static u32 msrs_to_save[] = { MSR_KVM_SYSTEM_TIME, MSR_KVM_WALL_CLOCK, HV_X64_MSR_GUEST_OS_ID, HV_X64_MSR_HYPERCALL, HV_X64_MSR_APIC_ASSIST_PAGE, MSR_IA32_SYSENTER_CS, MSR_IA32_SYSENTER_ESP, MSR_IA32_SYSENTER_EIP, MSR_K6_STAR, #ifdef CONFIG_X86_64 MSR_CSTAR, MSR_KERNEL_GS_BASE, MSR_SYSCALL_MASK, MSR_LSTAR, #endif MSR_IA32_TSC, MSR_IA32_PERF_STATUS, MSR_IA32_CR_PAT, MSR_VM_HSAVE_PA }; static unsigned num_msrs_to_save; static u32 emulated_msrs[] = { MSR_IA32_MISC_ENABLE, }; static void set_efer(struct kvm_vcpu *vcpu, u64 efer) { if (efer & efer_reserved_bits) { kvm_inject_gp(vcpu, 0); return; } if (is_paging(vcpu) && (vcpu->arch.efer & EFER_LME) != (efer & EFER_LME)) { kvm_inject_gp(vcpu, 0); return; } if (efer & EFER_FFXSR) { struct kvm_cpuid_entry2 *feat; feat = kvm_find_cpuid_entry(vcpu, 0x80000001, 0); if (!feat || !(feat->edx & bit(X86_FEATURE_FXSR_OPT))) { kvm_inject_gp(vcpu, 0); return; } } if (efer & EFER_SVME) { struct kvm_cpuid_entry2 *feat; feat = kvm_find_cpuid_entry(vcpu, 0x80000001, 0); if (!feat || !(feat->ecx & bit(X86_FEATURE_SVM))) { kvm_inject_gp(vcpu, 0); return; } } kvm_x86_ops->set_efer(vcpu, efer); efer &= ~EFER_LMA; efer |= vcpu->arch.efer & EFER_LMA; vcpu->arch.efer = efer; vcpu->arch.mmu.base_role.nxe = (efer & EFER_NX) && !tdp_enabled; kvm_mmu_reset_context(vcpu); } void kvm_enable_efer_bits(u64 mask) { efer_reserved_bits &= ~mask; } EXPORT_SYMBOL_GPL(kvm_enable_efer_bits); /* * Writes msr value into into the appropriate "register". * Returns 0 on success, non-0 otherwise. * Assumes vcpu_load() was already called. */ int kvm_set_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 data) { return kvm_x86_ops->set_msr(vcpu, msr_index, data); } /* * Adapt set_msr() to msr_io()'s calling convention */ static int do_set_msr(struct kvm_vcpu *vcpu, unsigned index, u64 *data) { return kvm_set_msr(vcpu, index, *data); } static void kvm_write_wall_clock(struct kvm *kvm, gpa_t wall_clock) { static int version; struct pvclock_wall_clock wc; struct timespec boot; if (!wall_clock) return; version++; kvm_write_guest(kvm, wall_clock, &version, sizeof(version)); /* * The guest calculates current wall clock time by adding * system time (updated by kvm_write_guest_time below) to the * wall clock specified here. guest system time equals host * system time for us, thus we must fill in host boot time here. */ getboottime(&boot); wc.sec = boot.tv_sec; wc.nsec = boot.tv_nsec; wc.version = version; kvm_write_guest(kvm, wall_clock, &wc, sizeof(wc)); version++; kvm_write_guest(kvm, wall_clock, &version, sizeof(version)); } static uint32_t div_frac(uint32_t dividend, uint32_t divisor) { uint32_t quotient, remainder; /* Don't try to replace with do_div(), this one calculates * "(dividend << 32) / divisor" */ __asm__ ( "divl %4" : "=a" (quotient), "=d" (remainder) : "0" (0), "1" (dividend), "r" (divisor) ); return quotient; } static void kvm_set_time_scale(uint32_t tsc_khz, struct pvclock_vcpu_time_info *hv_clock) { uint64_t nsecs = 1000000000LL; int32_t shift = 0; uint64_t tps64; uint32_t tps32; tps64 = tsc_khz * 1000LL; while (tps64 > nsecs*2) { tps64 >>= 1; shift--; } tps32 = (uint32_t)tps64; while (tps32 <= (uint32_t)nsecs) { tps32 <<= 1; shift++; } hv_clock->tsc_shift = shift; hv_clock->tsc_to_system_mul = div_frac(nsecs, tps32); pr_debug("%s: tsc_khz %u, tsc_shift %d, tsc_mul %u\n", __func__, tsc_khz, hv_clock->tsc_shift, hv_clock->tsc_to_system_mul); } static DEFINE_PER_CPU(unsigned long, cpu_tsc_khz); static void kvm_write_guest_time(struct kvm_vcpu *v) { struct timespec ts; unsigned long flags; struct kvm_vcpu_arch *vcpu = &v->arch; void *shared_kaddr; unsigned long this_tsc_khz; if ((!vcpu->time_page)) return; this_tsc_khz = get_cpu_var(cpu_tsc_khz); if (unlikely(vcpu->hv_clock_tsc_khz != this_tsc_khz)) { kvm_set_time_scale(this_tsc_khz, &vcpu->hv_clock); vcpu->hv_clock_tsc_khz = this_tsc_khz; } put_cpu_var(cpu_tsc_khz); /* Keep irq disabled to prevent changes to the clock */ local_irq_save(flags); kvm_get_msr(v, MSR_IA32_TSC, &vcpu->hv_clock.tsc_timestamp); ktime_get_ts(&ts); monotonic_to_bootbased(&ts); local_irq_restore(flags); /* With all the info we got, fill in the values */ vcpu->hv_clock.system_time = ts.tv_nsec + (NSEC_PER_SEC * (u64)ts.tv_sec) + v->kvm->arch.kvmclock_offset; /* * The interface expects us to write an even number signaling that the * update is finished. Since the guest won't see the intermediate * state, we just increase by 2 at the end. */ vcpu->hv_clock.version += 2; shared_kaddr = kmap_atomic(vcpu->time_page, KM_USER0); memcpy(shared_kaddr + vcpu->time_offset, &vcpu->hv_clock, sizeof(vcpu->hv_clock)); kunmap_atomic(shared_kaddr, KM_USER0); mark_page_dirty(v->kvm, vcpu->time >> PAGE_SHIFT); } static int kvm_request_guest_time_update(struct kvm_vcpu *v) { struct kvm_vcpu_arch *vcpu = &v->arch; if (!vcpu->time_page) return 0; set_bit(KVM_REQ_KVMCLOCK_UPDATE, &v->requests); return 1; } static bool msr_mtrr_valid(unsigned msr) { switch (msr) { case 0x200 ... 0x200 + 2 * KVM_NR_VAR_MTRR - 1: case MSR_MTRRfix64K_00000: case MSR_MTRRfix16K_80000: case MSR_MTRRfix16K_A0000: case MSR_MTRRfix4K_C0000: case MSR_MTRRfix4K_C8000: case MSR_MTRRfix4K_D0000: case MSR_MTRRfix4K_D8000: case MSR_MTRRfix4K_E0000: case MSR_MTRRfix4K_E8000: case MSR_MTRRfix4K_F0000: case MSR_MTRRfix4K_F8000: case MSR_MTRRdefType: case MSR_IA32_CR_PAT: return true; case 0x2f8: return true; } return false; } static bool valid_pat_type(unsigned t) { return t < 8 && (1 << t) & 0xf3; /* 0, 1, 4, 5, 6, 7 */ } static bool valid_mtrr_type(unsigned t) { return t < 8 && (1 << t) & 0x73; /* 0, 1, 4, 5, 6 */ } static bool mtrr_valid(struct kvm_vcpu *vcpu, u32 msr, u64 data) { int i; if (!msr_mtrr_valid(msr)) return false; if (msr == MSR_IA32_CR_PAT) { for (i = 0; i < 8; i++) if (!valid_pat_type((data >> (i * 8)) & 0xff)) return false; return true; } else if (msr == MSR_MTRRdefType) { if (data & ~0xcff) return false; return valid_mtrr_type(data & 0xff); } else if (msr >= MSR_MTRRfix64K_00000 && msr <= MSR_MTRRfix4K_F8000) { for (i = 0; i < 8 ; i++) if (!valid_mtrr_type((data >> (i * 8)) & 0xff)) return false; return true; } /* variable MTRRs */ return valid_mtrr_type(data & 0xff); } static int set_msr_mtrr(struct kvm_vcpu *vcpu, u32 msr, u64 data) { u64 *p = (u64 *)&vcpu->arch.mtrr_state.fixed_ranges; if (!mtrr_valid(vcpu, msr, data)) return 1; if (msr == MSR_MTRRdefType) { vcpu->arch.mtrr_state.def_type = data; vcpu->arch.mtrr_state.enabled = (data & 0xc00) >> 10; } else if (msr == MSR_MTRRfix64K_00000) p[0] = data; else if (msr == MSR_MTRRfix16K_80000 || msr == MSR_MTRRfix16K_A0000) p[1 + msr - MSR_MTRRfix16K_80000] = data; else if (msr >= MSR_MTRRfix4K_C0000 && msr <= MSR_MTRRfix4K_F8000) p[3 + msr - MSR_MTRRfix4K_C0000] = data; else if (msr == MSR_IA32_CR_PAT) vcpu->arch.pat = data; else { /* Variable MTRRs */ int idx, is_mtrr_mask; u64 *pt; idx = (msr - 0x200) / 2; is_mtrr_mask = msr - 0x200 - 2 * idx; if (!is_mtrr_mask) pt = (u64 *)&vcpu->arch.mtrr_state.var_ranges[idx].base_lo; else pt = (u64 *)&vcpu->arch.mtrr_state.var_ranges[idx].mask_lo; *pt = data; } kvm_mmu_reset_context(vcpu); return 0; } static int set_msr_mce(struct kvm_vcpu *vcpu, u32 msr, u64 data) { u64 mcg_cap = vcpu->arch.mcg_cap; unsigned bank_num = mcg_cap & 0xff; switch (msr) { case MSR_IA32_MCG_STATUS: vcpu->arch.mcg_status = data; break; case MSR_IA32_MCG_CTL: if (!(mcg_cap & MCG_CTL_P)) return 1; if (data != 0 && data != ~(u64)0) return -1; vcpu->arch.mcg_ctl = data; break; default: if (msr >= MSR_IA32_MC0_CTL && msr < MSR_IA32_MC0_CTL + 4 * bank_num) { u32 offset = msr - MSR_IA32_MC0_CTL; /* only 0 or all 1s can be written to IA32_MCi_CTL * some Linux kernels though clear bit 10 in bank 4 to * workaround a BIOS/GART TBL issue on AMD K8s, ignore * this to avoid an uncatched #GP in the guest */ if ((offset & 0x3) == 0 && data != 0 && (data | (1 << 10)) != ~(u64)0) return -1; vcpu->arch.mce_banks[offset] = data; break; } return 1; } return 0; } static int xen_hvm_config(struct kvm_vcpu *vcpu, u64 data) { struct kvm *kvm = vcpu->kvm; int lm = is_long_mode(vcpu); u8 *blob_addr = lm ? (u8 *)(long)kvm->arch.xen_hvm_config.blob_addr_64 : (u8 *)(long)kvm->arch.xen_hvm_config.blob_addr_32; u8 blob_size = lm ? kvm->arch.xen_hvm_config.blob_size_64 : kvm->arch.xen_hvm_config.blob_size_32; u32 page_num = data & ~PAGE_MASK; u64 page_addr = data & PAGE_MASK; u8 *page; int r; r = -E2BIG; if (page_num >= blob_size) goto out; r = -ENOMEM; page = kzalloc(PAGE_SIZE, GFP_KERNEL); if (!page) goto out; r = -EFAULT; if (copy_from_user(page, blob_addr + (page_num * PAGE_SIZE), PAGE_SIZE)) goto out_free; if (kvm_write_guest(kvm, page_addr, page, PAGE_SIZE)) goto out_free; r = 0; out_free: kfree(page); out: return r; } static bool kvm_hv_hypercall_enabled(struct kvm *kvm) { return kvm->arch.hv_hypercall & HV_X64_MSR_HYPERCALL_ENABLE; } static bool kvm_hv_msr_partition_wide(u32 msr) { bool r = false; switch (msr) { case HV_X64_MSR_GUEST_OS_ID: case HV_X64_MSR_HYPERCALL: r = true; break; } return r; } static int set_msr_hyperv_pw(struct kvm_vcpu *vcpu, u32 msr, u64 data) { struct kvm *kvm = vcpu->kvm; switch (msr) { case HV_X64_MSR_GUEST_OS_ID: kvm->arch.hv_guest_os_id = data; /* setting guest os id to zero disables hypercall page */ if (!kvm->arch.hv_guest_os_id) kvm->arch.hv_hypercall &= ~HV_X64_MSR_HYPERCALL_ENABLE; break; case HV_X64_MSR_HYPERCALL: { u64 gfn; unsigned long addr; u8 instructions[4]; /* if guest os id is not set hypercall should remain disabled */ if (!kvm->arch.hv_guest_os_id) break; if (!(data & HV_X64_MSR_HYPERCALL_ENABLE)) { kvm->arch.hv_hypercall = data; break; } gfn = data >> HV_X64_MSR_HYPERCALL_PAGE_ADDRESS_SHIFT; addr = gfn_to_hva(kvm, gfn); if (kvm_is_error_hva(addr)) return 1; kvm_x86_ops->patch_hypercall(vcpu, instructions); ((unsigned char *)instructions)[3] = 0xc3; /* ret */ if (copy_to_user((void __user *)addr, instructions, 4)) return 1; kvm->arch.hv_hypercall = data; break; } default: pr_unimpl(vcpu, "HYPER-V unimplemented wrmsr: 0x%x " "data 0x%llx\n", msr, data); return 1; } return 0; } static int set_msr_hyperv(struct kvm_vcpu *vcpu, u32 msr, u64 data) { switch (msr) { case HV_X64_MSR_APIC_ASSIST_PAGE: { unsigned long addr; if (!(data & HV_X64_MSR_APIC_ASSIST_PAGE_ENABLE)) { vcpu->arch.hv_vapic = data; break; } addr = gfn_to_hva(vcpu->kvm, data >> HV_X64_MSR_APIC_ASSIST_PAGE_ADDRESS_SHIFT); if (kvm_is_error_hva(addr)) return 1; if (clear_user((void __user *)addr, PAGE_SIZE)) return 1; vcpu->arch.hv_vapic = data; break; } case HV_X64_MSR_EOI: return kvm_hv_vapic_msr_write(vcpu, APIC_EOI, data); case HV_X64_MSR_ICR: return kvm_hv_vapic_msr_write(vcpu, APIC_ICR, data); case HV_X64_MSR_TPR: return kvm_hv_vapic_msr_write(vcpu, APIC_TASKPRI, data); default: pr_unimpl(vcpu, "HYPER-V unimplemented wrmsr: 0x%x " "data 0x%llx\n", msr, data); return 1; } return 0; } int kvm_set_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 data) { switch (msr) { case MSR_EFER: set_efer(vcpu, data); break; case MSR_K7_HWCR: data &= ~(u64)0x40; /* ignore flush filter disable */ if (data != 0) { pr_unimpl(vcpu, "unimplemented HWCR wrmsr: 0x%llx\n", data); return 1; } break; case MSR_FAM10H_MMIO_CONF_BASE: if (data != 0) { pr_unimpl(vcpu, "unimplemented MMIO_CONF_BASE wrmsr: " "0x%llx\n", data); return 1; } break; case MSR_AMD64_NB_CFG: break; case MSR_IA32_DEBUGCTLMSR: if (!data) { /* We support the non-activated case already */ break; } else if (data & ~(DEBUGCTLMSR_LBR | DEBUGCTLMSR_BTF)) { /* Values other than LBR and BTF are vendor-specific, thus reserved and should throw a #GP */ return 1; } pr_unimpl(vcpu, "%s: MSR_IA32_DEBUGCTLMSR 0x%llx, nop\n", __func__, data); break; case MSR_IA32_UCODE_REV: case MSR_IA32_UCODE_WRITE: case MSR_VM_HSAVE_PA: case MSR_AMD64_PATCH_LOADER: break; case 0x200 ... 0x2ff: return set_msr_mtrr(vcpu, msr, data); case MSR_IA32_APICBASE: kvm_set_apic_base(vcpu, data); break; case APIC_BASE_MSR ... APIC_BASE_MSR + 0x3ff: return kvm_x2apic_msr_write(vcpu, msr, data); case MSR_IA32_MISC_ENABLE: vcpu->arch.ia32_misc_enable_msr = data; break; case MSR_KVM_WALL_CLOCK: vcpu->kvm->arch.wall_clock = data; kvm_write_wall_clock(vcpu->kvm, data); break; case MSR_KVM_SYSTEM_TIME: { if (vcpu->arch.time_page) { kvm_release_page_dirty(vcpu->arch.time_page); vcpu->arch.time_page = NULL; } vcpu->arch.time = data; /* we verify if the enable bit is set... */ if (!(data & 1)) break; /* ...but clean it before doing the actual write */ vcpu->arch.time_offset = data & ~(PAGE_MASK | 1); vcpu->arch.time_page = gfn_to_page(vcpu->kvm, data >> PAGE_SHIFT); if (is_error_page(vcpu->arch.time_page)) { kvm_release_page_clean(vcpu->arch.time_page); vcpu->arch.time_page = NULL; } kvm_request_guest_time_update(vcpu); break; } case MSR_IA32_MCG_CTL: case MSR_IA32_MCG_STATUS: case MSR_IA32_MC0_CTL ... MSR_IA32_MC0_CTL + 4 * KVM_MAX_MCE_BANKS - 1: return set_msr_mce(vcpu, msr, data); /* Performance counters are not protected by a CPUID bit, * so we should check all of them in the generic path for the sake of * cross vendor migration. * Writing a zero into the event select MSRs disables them, * which we perfectly emulate ;-). Any other value should be at least * reported, some guests depend on them. */ case MSR_P6_EVNTSEL0: case MSR_P6_EVNTSEL1: case MSR_K7_EVNTSEL0: case MSR_K7_EVNTSEL1: case MSR_K7_EVNTSEL2: case MSR_K7_EVNTSEL3: if (data != 0) pr_unimpl(vcpu, "unimplemented perfctr wrmsr: " "0x%x data 0x%llx\n", msr, data); break; /* at least RHEL 4 unconditionally writes to the perfctr registers, * so we ignore writes to make it happy. */ case MSR_P6_PERFCTR0: case MSR_P6_PERFCTR1: case MSR_K7_PERFCTR0: case MSR_K7_PERFCTR1: case MSR_K7_PERFCTR2: case MSR_K7_PERFCTR3: pr_unimpl(vcpu, "unimplemented perfctr wrmsr: " "0x%x data 0x%llx\n", msr, data); break; case HV_X64_MSR_GUEST_OS_ID ... HV_X64_MSR_SINT15: if (kvm_hv_msr_partition_wide(msr)) { int r; mutex_lock(&vcpu->kvm->lock); r = set_msr_hyperv_pw(vcpu, msr, data); mutex_unlock(&vcpu->kvm->lock); return r; } else return set_msr_hyperv(vcpu, msr, data); break; default: if (msr && (msr == vcpu->kvm->arch.xen_hvm_config.msr)) return xen_hvm_config(vcpu, data); if (!ignore_msrs) { pr_unimpl(vcpu, "unhandled wrmsr: 0x%x data %llx\n", msr, data); return 1; } else { pr_unimpl(vcpu, "ignored wrmsr: 0x%x data %llx\n", msr, data); break; } } return 0; } EXPORT_SYMBOL_GPL(kvm_set_msr_common); /* * Reads an msr value (of 'msr_index') into 'pdata'. * Returns 0 on success, non-0 otherwise. * Assumes vcpu_load() was already called. */ int kvm_get_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 *pdata) { return kvm_x86_ops->get_msr(vcpu, msr_index, pdata); } static int get_msr_mtrr(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata) { u64 *p = (u64 *)&vcpu->arch.mtrr_state.fixed_ranges; if (!msr_mtrr_valid(msr)) return 1; if (msr == MSR_MTRRdefType) *pdata = vcpu->arch.mtrr_state.def_type + (vcpu->arch.mtrr_state.enabled << 10); else if (msr == MSR_MTRRfix64K_00000) *pdata = p[0]; else if (msr == MSR_MTRRfix16K_80000 || msr == MSR_MTRRfix16K_A0000) *pdata = p[1 + msr - MSR_MTRRfix16K_80000]; else if (msr >= MSR_MTRRfix4K_C0000 && msr <= MSR_MTRRfix4K_F8000) *pdata = p[3 + msr - MSR_MTRRfix4K_C0000]; else if (msr == MSR_IA32_CR_PAT) *pdata = vcpu->arch.pat; else { /* Variable MTRRs */ int idx, is_mtrr_mask; u64 *pt; idx = (msr - 0x200) / 2; is_mtrr_mask = msr - 0x200 - 2 * idx; if (!is_mtrr_mask) pt = (u64 *)&vcpu->arch.mtrr_state.var_ranges[idx].base_lo; else pt = (u64 *)&vcpu->arch.mtrr_state.var_ranges[idx].mask_lo; *pdata = *pt; } return 0; } static int get_msr_mce(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata) { u64 data; u64 mcg_cap = vcpu->arch.mcg_cap; unsigned bank_num = mcg_cap & 0xff; switch (msr) { case MSR_IA32_P5_MC_ADDR: case MSR_IA32_P5_MC_TYPE: data = 0; break; case MSR_IA32_MCG_CAP: data = vcpu->arch.mcg_cap; break; case MSR_IA32_MCG_CTL: if (!(mcg_cap & MCG_CTL_P)) return 1; data = vcpu->arch.mcg_ctl; break; case MSR_IA32_MCG_STATUS: data = vcpu->arch.mcg_status; break; default: if (msr >= MSR_IA32_MC0_CTL && msr < MSR_IA32_MC0_CTL + 4 * bank_num) { u32 offset = msr - MSR_IA32_MC0_CTL; data = vcpu->arch.mce_banks[offset]; break; } return 1; } *pdata = data; return 0; } static int get_msr_hyperv_pw(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata) { u64 data = 0; struct kvm *kvm = vcpu->kvm; switch (msr) { case HV_X64_MSR_GUEST_OS_ID: data = kvm->arch.hv_guest_os_id; break; case HV_X64_MSR_HYPERCALL: data = kvm->arch.hv_hypercall; break; default: pr_unimpl(vcpu, "Hyper-V unhandled rdmsr: 0x%x\n", msr); return 1; } *pdata = data; return 0; } static int get_msr_hyperv(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata) { u64 data = 0; switch (msr) { case HV_X64_MSR_VP_INDEX: { int r; struct kvm_vcpu *v; kvm_for_each_vcpu(r, v, vcpu->kvm) if (v == vcpu) data = r; break; } case HV_X64_MSR_EOI: return kvm_hv_vapic_msr_read(vcpu, APIC_EOI, pdata); case HV_X64_MSR_ICR: return kvm_hv_vapic_msr_read(vcpu, APIC_ICR, pdata); case HV_X64_MSR_TPR: return kvm_hv_vapic_msr_read(vcpu, APIC_TASKPRI, pdata); default: pr_unimpl(vcpu, "Hyper-V unhandled rdmsr: 0x%x\n", msr); return 1; } *pdata = data; return 0; } int kvm_get_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata) { u64 data; switch (msr) { case MSR_IA32_PLATFORM_ID: case MSR_IA32_UCODE_REV: case MSR_IA32_EBL_CR_POWERON: case MSR_IA32_DEBUGCTLMSR: case MSR_IA32_LASTBRANCHFROMIP: case MSR_IA32_LASTBRANCHTOIP: case MSR_IA32_LASTINTFROMIP: case MSR_IA32_LASTINTTOIP: case MSR_K8_SYSCFG: case MSR_K7_HWCR: case MSR_VM_HSAVE_PA: case MSR_P6_PERFCTR0: case MSR_P6_PERFCTR1: case MSR_P6_EVNTSEL0: case MSR_P6_EVNTSEL1: case MSR_K7_EVNTSEL0: case MSR_K7_PERFCTR0: case MSR_K8_INT_PENDING_MSG: case MSR_AMD64_NB_CFG: case MSR_FAM10H_MMIO_CONF_BASE: data = 0; break; case MSR_MTRRcap: data = 0x500 | KVM_NR_VAR_MTRR; break; case 0x200 ... 0x2ff: return get_msr_mtrr(vcpu, msr, pdata); case 0xcd: /* fsb frequency */ data = 3; break; case MSR_IA32_APICBASE: data = kvm_get_apic_base(vcpu); break; case APIC_BASE_MSR ... APIC_BASE_MSR + 0x3ff: return kvm_x2apic_msr_read(vcpu, msr, pdata); break; case MSR_IA32_MISC_ENABLE: data = vcpu->arch.ia32_misc_enable_msr; break; case MSR_IA32_PERF_STATUS: /* TSC increment by tick */ data = 1000ULL; /* CPU multiplier */ data |= (((uint64_t)4ULL) << 40); break; case MSR_EFER: data = vcpu->arch.efer; break; case MSR_KVM_WALL_CLOCK: data = vcpu->kvm->arch.wall_clock; break; case MSR_KVM_SYSTEM_TIME: data = vcpu->arch.time; break; case MSR_IA32_P5_MC_ADDR: case MSR_IA32_P5_MC_TYPE: case MSR_IA32_MCG_CAP: case MSR_IA32_MCG_CTL: case MSR_IA32_MCG_STATUS: case MSR_IA32_MC0_CTL ... MSR_IA32_MC0_CTL + 4 * KVM_MAX_MCE_BANKS - 1: return get_msr_mce(vcpu, msr, pdata); case HV_X64_MSR_GUEST_OS_ID ... HV_X64_MSR_SINT15: if (kvm_hv_msr_partition_wide(msr)) { int r; mutex_lock(&vcpu->kvm->lock); r = get_msr_hyperv_pw(vcpu, msr, pdata); mutex_unlock(&vcpu->kvm->lock); return r; } else return get_msr_hyperv(vcpu, msr, pdata); break; default: if (!ignore_msrs) { pr_unimpl(vcpu, "unhandled rdmsr: 0x%x\n", msr); return 1; } else { pr_unimpl(vcpu, "ignored rdmsr: 0x%x\n", msr); data = 0; } break; } *pdata = data; return 0; } EXPORT_SYMBOL_GPL(kvm_get_msr_common); /* * Read or write a bunch of msrs. All parameters are kernel addresses. * * @return number of msrs set successfully. */ static int __msr_io(struct kvm_vcpu *vcpu, struct kvm_msrs *msrs, struct kvm_msr_entry *entries, int (*do_msr)(struct kvm_vcpu *vcpu, unsigned index, u64 *data)) { int i, idx; vcpu_load(vcpu); idx = srcu_read_lock(&vcpu->kvm->srcu); for (i = 0; i < msrs->nmsrs; ++i) if (do_msr(vcpu, entries[i].index, &entries[i].data)) break; srcu_read_unlock(&vcpu->kvm->srcu, idx); vcpu_put(vcpu); return i; } /* * Read or write a bunch of msrs. Parameters are user addresses. * * @return number of msrs set successfully. */ static int msr_io(struct kvm_vcpu *vcpu, struct kvm_msrs __user *user_msrs, int (*do_msr)(struct kvm_vcpu *vcpu, unsigned index, u64 *data), int writeback) { struct kvm_msrs msrs; struct kvm_msr_entry *entries; int r, n; unsigned size; r = -EFAULT; if (copy_from_user(&msrs, user_msrs, sizeof msrs)) goto out; r = -E2BIG; if (msrs.nmsrs >= MAX_IO_MSRS) goto out; r = -ENOMEM; size = sizeof(struct kvm_msr_entry) * msrs.nmsrs; entries = vmalloc(size); if (!entries) goto out; r = -EFAULT; if (copy_from_user(entries, user_msrs->entries, size)) goto out_free; r = n = __msr_io(vcpu, &msrs, entries, do_msr); if (r < 0) goto out_free; r = -EFAULT; if (writeback && copy_to_user(user_msrs->entries, entries, size)) goto out_free; r = n; out_free: vfree(entries); out: return r; } int kvm_dev_ioctl_check_extension(long ext) { int r; switch (ext) { case KVM_CAP_IRQCHIP: case KVM_CAP_HLT: case KVM_CAP_MMU_SHADOW_CACHE_CONTROL: case KVM_CAP_SET_TSS_ADDR: case KVM_CAP_EXT_CPUID: case KVM_CAP_CLOCKSOURCE: case KVM_CAP_PIT: case KVM_CAP_NOP_IO_DELAY: case KVM_CAP_MP_STATE: case KVM_CAP_SYNC_MMU: case KVM_CAP_REINJECT_CONTROL: case KVM_CAP_IRQ_INJECT_STATUS: case KVM_CAP_ASSIGN_DEV_IRQ: case KVM_CAP_IRQFD: case KVM_CAP_IOEVENTFD: case KVM_CAP_PIT2: case KVM_CAP_PIT_STATE2: case KVM_CAP_SET_IDENTITY_MAP_ADDR: case KVM_CAP_XEN_HVM: case KVM_CAP_ADJUST_CLOCK: case KVM_CAP_VCPU_EVENTS: case KVM_CAP_HYPERV: case KVM_CAP_HYPERV_VAPIC: case KVM_CAP_HYPERV_SPIN: case KVM_CAP_PCI_SEGMENT: case KVM_CAP_X86_ROBUST_SINGLESTEP: r = 1; break; case KVM_CAP_COALESCED_MMIO: r = KVM_COALESCED_MMIO_PAGE_OFFSET; break; case KVM_CAP_VAPIC: r = !kvm_x86_ops->cpu_has_accelerated_tpr(); break; case KVM_CAP_NR_VCPUS: r = KVM_MAX_VCPUS; break; case KVM_CAP_NR_MEMSLOTS: r = KVM_MEMORY_SLOTS; break; case KVM_CAP_PV_MMU: /* obsolete */ r = 0; break; case KVM_CAP_IOMMU: r = iommu_found(); break; case KVM_CAP_MCE: r = KVM_MAX_MCE_BANKS; break; default: r = 0; break; } return r; } long kvm_arch_dev_ioctl(struct file *filp, unsigned int ioctl, unsigned long arg) { void __user *argp = (void __user *)arg; long r; switch (ioctl) { case KVM_GET_MSR_INDEX_LIST: { struct kvm_msr_list __user *user_msr_list = argp; struct kvm_msr_list msr_list; unsigned n; r = -EFAULT; if (copy_from_user(&msr_list, user_msr_list, sizeof msr_list)) goto out; n = msr_list.nmsrs; msr_list.nmsrs = num_msrs_to_save + ARRAY_SIZE(emulated_msrs); if (copy_to_user(user_msr_list, &msr_list, sizeof msr_list)) goto out; r = -E2BIG; if (n < msr_list.nmsrs) goto out; r = -EFAULT; if (copy_to_user(user_msr_list->indices, &msrs_to_save, num_msrs_to_save * sizeof(u32))) goto out; if (copy_to_user(user_msr_list->indices + num_msrs_to_save, &emulated_msrs, ARRAY_SIZE(emulated_msrs) * sizeof(u32))) goto out; r = 0; break; } case KVM_GET_SUPPORTED_CPUID: { struct kvm_cpuid2 __user *cpuid_arg = argp; struct kvm_cpuid2 cpuid; r = -EFAULT; if (copy_from_user(&cpuid, cpuid_arg, sizeof cpuid)) goto out; r = kvm_dev_ioctl_get_supported_cpuid(&cpuid, cpuid_arg->entries); if (r) goto out; r = -EFAULT; if (copy_to_user(cpuid_arg, &cpuid, sizeof cpuid)) goto out; r = 0; break; } case KVM_X86_GET_MCE_CAP_SUPPORTED: { u64 mce_cap; mce_cap = KVM_MCE_CAP_SUPPORTED; r = -EFAULT; if (copy_to_user(argp, &mce_cap, sizeof mce_cap)) goto out; r = 0; break; } default: r = -EINVAL; } out: return r; } void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu) { kvm_x86_ops->vcpu_load(vcpu, cpu); if (unlikely(per_cpu(cpu_tsc_khz, cpu) == 0)) { unsigned long khz = cpufreq_quick_get(cpu); if (!khz) khz = tsc_khz; per_cpu(cpu_tsc_khz, cpu) = khz; } kvm_request_guest_time_update(vcpu); } void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu) { kvm_put_guest_fpu(vcpu); kvm_x86_ops->vcpu_put(vcpu); } static int is_efer_nx(void) { unsigned long long efer = 0; rdmsrl_safe(MSR_EFER, &efer); return efer & EFER_NX; } static void cpuid_fix_nx_cap(struct kvm_vcpu *vcpu) { int i; struct kvm_cpuid_entry2 *e, *entry; entry = NULL; for (i = 0; i < vcpu->arch.cpuid_nent; ++i) { e = &vcpu->arch.cpuid_entries[i]; if (e->function == 0x80000001) { entry = e; break; } } if (entry && (entry->edx & (1 << 20)) && !is_efer_nx()) { entry->edx &= ~(1 << 20); printk(KERN_INFO "kvm: guest NX capability removed\n"); } } /* when an old userspace process fills a new kernel module */ static int kvm_vcpu_ioctl_set_cpuid(struct kvm_vcpu *vcpu, struct kvm_cpuid *cpuid, struct kvm_cpuid_entry __user *entries) { int r, i; struct kvm_cpuid_entry *cpuid_entries; r = -E2BIG; if (cpuid->nent > KVM_MAX_CPUID_ENTRIES) goto out; r = -ENOMEM; cpuid_entries = vmalloc(sizeof(struct kvm_cpuid_entry) * cpuid->nent); if (!cpuid_entries) goto out; r = -EFAULT; if (copy_from_user(cpuid_entries, entries, cpuid->nent * sizeof(struct kvm_cpuid_entry))) goto out_free; for (i = 0; i < cpuid->nent; i++) { vcpu->arch.cpuid_entries[i].function = cpuid_entries[i].function; vcpu->arch.cpuid_entries[i].eax = cpuid_entries[i].eax; vcpu->arch.cpuid_entries[i].ebx = cpuid_entries[i].ebx; vcpu->arch.cpuid_entries[i].ecx = cpuid_entries[i].ecx; vcpu->arch.cpuid_entries[i].edx = cpuid_entries[i].edx; vcpu->arch.cpuid_entries[i].index = 0; vcpu->arch.cpuid_entries[i].flags = 0; vcpu->arch.cpuid_entries[i].padding[0] = 0; vcpu->arch.cpuid_entries[i].padding[1] = 0; vcpu->arch.cpuid_entries[i].padding[2] = 0; } vcpu->arch.cpuid_nent = cpuid->nent; cpuid_fix_nx_cap(vcpu); r = 0; kvm_apic_set_version(vcpu); kvm_x86_ops->cpuid_update(vcpu); out_free: vfree(cpuid_entries); out: return r; } static int kvm_vcpu_ioctl_set_cpuid2(struct kvm_vcpu *vcpu, struct kvm_cpuid2 *cpuid, struct kvm_cpuid_entry2 __user *entries) { int r; r = -E2BIG; if (cpuid->nent > KVM_MAX_CPUID_ENTRIES) goto out; r = -EFAULT; if (copy_from_user(&vcpu->arch.cpuid_entries, entries, cpuid->nent * sizeof(struct kvm_cpuid_entry2))) goto out; vcpu->arch.cpuid_nent = cpuid->nent; kvm_apic_set_version(vcpu); kvm_x86_ops->cpuid_update(vcpu); return 0; out: return r; } static int kvm_vcpu_ioctl_get_cpuid2(struct kvm_vcpu *vcpu, struct kvm_cpuid2 *cpuid, struct kvm_cpuid_entry2 __user *entries) { int r; r = -E2BIG; if (cpuid->nent < vcpu->arch.cpuid_nent) goto out; r = -EFAULT; if (copy_to_user(entries, &vcpu->arch.cpuid_entries, vcpu->arch.cpuid_nent * sizeof(struct kvm_cpuid_entry2))) goto out; return 0; out: cpuid->nent = vcpu->arch.cpuid_nent; return r; } static void do_cpuid_1_ent(struct kvm_cpuid_entry2 *entry, u32 function, u32 index) { entry->function = function; entry->index = index; cpuid_count(entry->function, entry->index, &entry->eax, &entry->ebx, &entry->ecx, &entry->edx); entry->flags = 0; } #define F(x) bit(X86_FEATURE_##x) static void do_cpuid_ent(struct kvm_cpuid_entry2 *entry, u32 function, u32 index, int *nent, int maxnent) { unsigned f_nx = is_efer_nx() ? F(NX) : 0; #ifdef CONFIG_X86_64 unsigned f_gbpages = (kvm_x86_ops->get_lpage_level() == PT_PDPE_LEVEL) ? F(GBPAGES) : 0; unsigned f_lm = F(LM); #else unsigned f_gbpages = 0; unsigned f_lm = 0; #endif unsigned f_rdtscp = kvm_x86_ops->rdtscp_supported() ? F(RDTSCP) : 0; /* cpuid 1.edx */ const u32 kvm_supported_word0_x86_features = F(FPU) | F(VME) | F(DE) | F(PSE) | F(TSC) | F(MSR) | F(PAE) | F(MCE) | F(CX8) | F(APIC) | 0 /* Reserved */ | F(SEP) | F(MTRR) | F(PGE) | F(MCA) | F(CMOV) | F(PAT) | F(PSE36) | 0 /* PSN */ | F(CLFLSH) | 0 /* Reserved, DS, ACPI */ | F(MMX) | F(FXSR) | F(XMM) | F(XMM2) | F(SELFSNOOP) | 0 /* HTT, TM, Reserved, PBE */; /* cpuid 0x80000001.edx */ const u32 kvm_supported_word1_x86_features = F(FPU) | F(VME) | F(DE) | F(PSE) | F(TSC) | F(MSR) | F(PAE) | F(MCE) | F(CX8) | F(APIC) | 0 /* Reserved */ | F(SYSCALL) | F(MTRR) | F(PGE) | F(MCA) | F(CMOV) | F(PAT) | F(PSE36) | 0 /* Reserved */ | f_nx | 0 /* Reserved */ | F(MMXEXT) | F(MMX) | F(FXSR) | F(FXSR_OPT) | f_gbpages | f_rdtscp | 0 /* Reserved */ | f_lm | F(3DNOWEXT) | F(3DNOW); /* cpuid 1.ecx */ const u32 kvm_supported_word4_x86_features = F(XMM3) | 0 /* Reserved, DTES64, MONITOR */ | 0 /* DS-CPL, VMX, SMX, EST */ | 0 /* TM2 */ | F(SSSE3) | 0 /* CNXT-ID */ | 0 /* Reserved */ | 0 /* Reserved */ | F(CX16) | 0 /* xTPR Update, PDCM */ | 0 /* Reserved, DCA */ | F(XMM4_1) | F(XMM4_2) | F(X2APIC) | F(MOVBE) | F(POPCNT) | 0 /* Reserved, XSAVE, OSXSAVE */; /* cpuid 0x80000001.ecx */ const u32 kvm_supported_word6_x86_features = F(LAHF_LM) | F(CMP_LEGACY) | F(SVM) | 0 /* ExtApicSpace */ | F(CR8_LEGACY) | F(ABM) | F(SSE4A) | F(MISALIGNSSE) | F(3DNOWPREFETCH) | 0 /* OSVW */ | 0 /* IBS */ | F(SSE5) | 0 /* SKINIT */ | 0 /* WDT */; /* all calls to cpuid_count() should be made on the same cpu */ get_cpu(); do_cpuid_1_ent(entry, function, index); ++*nent; switch (function) { case 0: entry->eax = min(entry->eax, (u32)0xb); break; case 1: entry->edx &= kvm_supported_word0_x86_features; entry->ecx &= kvm_supported_word4_x86_features; /* we support x2apic emulation even if host does not support * it since we emulate x2apic in software */ entry->ecx |= F(X2APIC); break; /* function 2 entries are STATEFUL. That is, repeated cpuid commands * may return different values. This forces us to get_cpu() before * issuing the first command, and also to emulate this annoying behavior * in kvm_emulate_cpuid() using KVM_CPUID_FLAG_STATE_READ_NEXT */ case 2: { int t, times = entry->eax & 0xff; entry->flags |= KVM_CPUID_FLAG_STATEFUL_FUNC; entry->flags |= KVM_CPUID_FLAG_STATE_READ_NEXT; for (t = 1; t < times && *nent < maxnent; ++t) { do_cpuid_1_ent(&entry[t], function, 0); entry[t].flags |= KVM_CPUID_FLAG_STATEFUL_FUNC; ++*nent; } break; } /* function 4 and 0xb have additional index. */ case 4: { int i, cache_type; entry->flags |= KVM_CPUID_FLAG_SIGNIFCANT_INDEX; /* read more entries until cache_type is zero */ for (i = 1; *nent < maxnent; ++i) { cache_type = entry[i - 1].eax & 0x1f; if (!cache_type) break; do_cpuid_1_ent(&entry[i], function, i); entry[i].flags |= KVM_CPUID_FLAG_SIGNIFCANT_INDEX; ++*nent; } break; } case 0xb: { int i, level_type; entry->flags |= KVM_CPUID_FLAG_SIGNIFCANT_INDEX; /* read more entries until level_type is zero */ for (i = 1; *nent < maxnent; ++i) { level_type = entry[i - 1].ecx & 0xff00; if (!level_type) break; do_cpuid_1_ent(&entry[i], function, i); entry[i].flags |= KVM_CPUID_FLAG_SIGNIFCANT_INDEX; ++*nent; } break; } case 0x80000000: entry->eax = min(entry->eax, 0x8000001a); break; case 0x80000001: entry->edx &= kvm_supported_word1_x86_features; entry->ecx &= kvm_supported_word6_x86_features; break; } put_cpu(); } #undef F static int kvm_dev_ioctl_get_supported_cpuid(struct kvm_cpuid2 *cpuid, struct kvm_cpuid_entry2 __user *entries) { struct kvm_cpuid_entry2 *cpuid_entries; int limit, nent = 0, r = -E2BIG; u32 func; if (cpuid->nent < 1) goto out; if (cpuid->nent > KVM_MAX_CPUID_ENTRIES) cpuid->nent = KVM_MAX_CPUID_ENTRIES; r = -ENOMEM; cpuid_entries = vmalloc(sizeof(struct kvm_cpuid_entry2) * cpuid->nent); if (!cpuid_entries) goto out; do_cpuid_ent(&cpuid_entries[0], 0, 0, &nent, cpuid->nent); limit = cpuid_entries[0].eax; for (func = 1; func <= limit && nent < cpuid->nent; ++func) do_cpuid_ent(&cpuid_entries[nent], func, 0, &nent, cpuid->nent); r = -E2BIG; if (nent >= cpuid->nent) goto out_free; do_cpuid_ent(&cpuid_entries[nent], 0x80000000, 0, &nent, cpuid->nent); limit = cpuid_entries[nent - 1].eax; for (func = 0x80000001; func <= limit && nent < cpuid->nent; ++func) do_cpuid_ent(&cpuid_entries[nent], func, 0, &nent, cpuid->nent); r = -E2BIG; if (nent >= cpuid->nent) goto out_free; r = -EFAULT; if (copy_to_user(entries, cpuid_entries, nent * sizeof(struct kvm_cpuid_entry2))) goto out_free; cpuid->nent = nent; r = 0; out_free: vfree(cpuid_entries); out: return r; } static int kvm_vcpu_ioctl_get_lapic(struct kvm_vcpu *vcpu, struct kvm_lapic_state *s) { vcpu_load(vcpu); memcpy(s->regs, vcpu->arch.apic->regs, sizeof *s); vcpu_put(vcpu); return 0; } static int kvm_vcpu_ioctl_set_lapic(struct kvm_vcpu *vcpu, struct kvm_lapic_state *s) { vcpu_load(vcpu); memcpy(vcpu->arch.apic->regs, s->regs, sizeof *s); kvm_apic_post_state_restore(vcpu); update_cr8_intercept(vcpu); vcpu_put(vcpu); return 0; } static int kvm_vcpu_ioctl_interrupt(struct kvm_vcpu *vcpu, struct kvm_interrupt *irq) { if (irq->irq < 0 || irq->irq >= 256) return -EINVAL; if (irqchip_in_kernel(vcpu->kvm)) return -ENXIO; vcpu_load(vcpu); kvm_queue_interrupt(vcpu, irq->irq, false); vcpu_put(vcpu); return 0; } static int kvm_vcpu_ioctl_nmi(struct kvm_vcpu *vcpu) { vcpu_load(vcpu); kvm_inject_nmi(vcpu); vcpu_put(vcpu); return 0; } static int vcpu_ioctl_tpr_access_reporting(struct kvm_vcpu *vcpu, struct kvm_tpr_access_ctl *tac) { if (tac->flags) return -EINVAL; vcpu->arch.tpr_access_reporting = !!tac->enabled; return 0; } static int kvm_vcpu_ioctl_x86_setup_mce(struct kvm_vcpu *vcpu, u64 mcg_cap) { int r; unsigned bank_num = mcg_cap & 0xff, bank; r = -EINVAL; if (!bank_num || bank_num >= KVM_MAX_MCE_BANKS) goto out; if (mcg_cap & ~(KVM_MCE_CAP_SUPPORTED | 0xff | 0xff0000)) goto out; r = 0; vcpu->arch.mcg_cap = mcg_cap; /* Init IA32_MCG_CTL to all 1s */ if (mcg_cap & MCG_CTL_P) vcpu->arch.mcg_ctl = ~(u64)0; /* Init IA32_MCi_CTL to all 1s */ for (bank = 0; bank < bank_num; bank++) vcpu->arch.mce_banks[bank*4] = ~(u64)0; out: return r; } static int kvm_vcpu_ioctl_x86_set_mce(struct kvm_vcpu *vcpu, struct kvm_x86_mce *mce) { u64 mcg_cap = vcpu->arch.mcg_cap; unsigned bank_num = mcg_cap & 0xff; u64 *banks = vcpu->arch.mce_banks; if (mce->bank >= bank_num || !(mce->status & MCI_STATUS_VAL)) return -EINVAL; /* * if IA32_MCG_CTL is not all 1s, the uncorrected error * reporting is disabled */ if ((mce->status & MCI_STATUS_UC) && (mcg_cap & MCG_CTL_P) && vcpu->arch.mcg_ctl != ~(u64)0) return 0; banks += 4 * mce->bank; /* * if IA32_MCi_CTL is not all 1s, the uncorrected error * reporting is disabled for the bank */ if ((mce->status & MCI_STATUS_UC) && banks[0] != ~(u64)0) return 0; if (mce->status & MCI_STATUS_UC) { if ((vcpu->arch.mcg_status & MCG_STATUS_MCIP) || !kvm_read_cr4_bits(vcpu, X86_CR4_MCE)) { printk(KERN_DEBUG "kvm: set_mce: " "injects mce exception while " "previous one is in progress!\n"); set_bit(KVM_REQ_TRIPLE_FAULT, &vcpu->requests); return 0; } if (banks[1] & MCI_STATUS_VAL) mce->status |= MCI_STATUS_OVER; banks[2] = mce->addr; banks[3] = mce->misc; vcpu->arch.mcg_status = mce->mcg_status; banks[1] = mce->status; kvm_queue_exception(vcpu, MC_VECTOR); } else if (!(banks[1] & MCI_STATUS_VAL) || !(banks[1] & MCI_STATUS_UC)) { if (banks[1] & MCI_STATUS_VAL) mce->status |= MCI_STATUS_OVER; banks[2] = mce->addr; banks[3] = mce->misc; banks[1] = mce->status; } else banks[1] |= MCI_STATUS_OVER; return 0; } static void kvm_vcpu_ioctl_x86_get_vcpu_events(struct kvm_vcpu *vcpu, struct kvm_vcpu_events *events) { vcpu_load(vcpu); events->exception.injected = vcpu->arch.exception.pending; events->exception.nr = vcpu->arch.exception.nr; events->exception.has_error_code = vcpu->arch.exception.has_error_code; events->exception.error_code = vcpu->arch.exception.error_code; events->interrupt.injected = vcpu->arch.interrupt.pending; events->interrupt.nr = vcpu->arch.interrupt.nr; events->interrupt.soft = vcpu->arch.interrupt.soft; events->nmi.injected = vcpu->arch.nmi_injected; events->nmi.pending = vcpu->arch.nmi_pending; events->nmi.masked = kvm_x86_ops->get_nmi_mask(vcpu); events->sipi_vector = vcpu->arch.sipi_vector; events->flags = (KVM_VCPUEVENT_VALID_NMI_PENDING | KVM_VCPUEVENT_VALID_SIPI_VECTOR); vcpu_put(vcpu); } static int kvm_vcpu_ioctl_x86_set_vcpu_events(struct kvm_vcpu *vcpu, struct kvm_vcpu_events *events) { if (events->flags & ~(KVM_VCPUEVENT_VALID_NMI_PENDING | KVM_VCPUEVENT_VALID_SIPI_VECTOR)) return -EINVAL; vcpu_load(vcpu); vcpu->arch.exception.pending = events->exception.injected; vcpu->arch.exception.nr = events->exception.nr; vcpu->arch.exception.has_error_code = events->exception.has_error_code; vcpu->arch.exception.error_code = events->exception.error_code; vcpu->arch.interrupt.pending = events->interrupt.injected; vcpu->arch.interrupt.nr = events->interrupt.nr; vcpu->arch.interrupt.soft = events->interrupt.soft; if (vcpu->arch.interrupt.pending && irqchip_in_kernel(vcpu->kvm)) kvm_pic_clear_isr_ack(vcpu->kvm); vcpu->arch.nmi_injected = events->nmi.injected; if (events->flags & KVM_VCPUEVENT_VALID_NMI_PENDING) vcpu->arch.nmi_pending = events->nmi.pending; kvm_x86_ops->set_nmi_mask(vcpu, events->nmi.masked); if (events->flags & KVM_VCPUEVENT_VALID_SIPI_VECTOR) vcpu->arch.sipi_vector = events->sipi_vector; vcpu_put(vcpu); return 0; } long kvm_arch_vcpu_ioctl(struct file *filp, unsigned int ioctl, unsigned long arg) { struct kvm_vcpu *vcpu = filp->private_data; void __user *argp = (void __user *)arg; int r; struct kvm_lapic_state *lapic = NULL; switch (ioctl) { case KVM_GET_LAPIC: { r = -EINVAL; if (!vcpu->arch.apic) goto out; lapic = kzalloc(sizeof(struct kvm_lapic_state), GFP_KERNEL); r = -ENOMEM; if (!lapic) goto out; r = kvm_vcpu_ioctl_get_lapic(vcpu, lapic); if (r) goto out; r = -EFAULT; if (copy_to_user(argp, lapic, sizeof(struct kvm_lapic_state))) goto out; r = 0; break; } case KVM_SET_LAPIC: { r = -EINVAL; if (!vcpu->arch.apic) goto out; lapic = kmalloc(sizeof(struct kvm_lapic_state), GFP_KERNEL); r = -ENOMEM; if (!lapic) goto out; r = -EFAULT; if (copy_from_user(lapic, argp, sizeof(struct kvm_lapic_state))) goto out; r = kvm_vcpu_ioctl_set_lapic(vcpu, lapic); if (r) goto out; r = 0; break; } case KVM_INTERRUPT: { struct kvm_interrupt irq; r = -EFAULT; if (copy_from_user(&irq, argp, sizeof irq)) goto out; r = kvm_vcpu_ioctl_interrupt(vcpu, &irq); if (r) goto out; r = 0; break; } case KVM_NMI: { r = kvm_vcpu_ioctl_nmi(vcpu); if (r) goto out; r = 0; break; } case KVM_SET_CPUID: { struct kvm_cpuid __user *cpuid_arg = argp; struct kvm_cpuid cpuid; r = -EFAULT; if (copy_from_user(&cpuid, cpuid_arg, sizeof cpuid)) goto out; r = kvm_vcpu_ioctl_set_cpuid(vcpu, &cpuid, cpuid_arg->entries); if (r) goto out; break; } case KVM_SET_CPUID2: { struct kvm_cpuid2 __user *cpuid_arg = argp; struct kvm_cpuid2 cpuid; r = -EFAULT; if (copy_from_user(&cpuid, cpuid_arg, sizeof cpuid)) goto out; r = kvm_vcpu_ioctl_set_cpuid2(vcpu, &cpuid, cpuid_arg->entries); if (r) goto out; break; } case KVM_GET_CPUID2: { struct kvm_cpuid2 __user *cpuid_arg = argp; struct kvm_cpuid2 cpuid; r = -EFAULT; if (copy_from_user(&cpuid, cpuid_arg, sizeof cpuid)) goto out; r = kvm_vcpu_ioctl_get_cpuid2(vcpu, &cpuid, cpuid_arg->entries); if (r) goto out; r = -EFAULT; if (copy_to_user(cpuid_arg, &cpuid, sizeof cpuid)) goto out; r = 0; break; } case KVM_GET_MSRS: r = msr_io(vcpu, argp, kvm_get_msr, 1); break; case KVM_SET_MSRS: r = msr_io(vcpu, argp, do_set_msr, 0); break; case KVM_TPR_ACCESS_REPORTING: { struct kvm_tpr_access_ctl tac; r = -EFAULT; if (copy_from_user(&tac, argp, sizeof tac)) goto out; r = vcpu_ioctl_tpr_access_reporting(vcpu, &tac); if (r) goto out; r = -EFAULT; if (copy_to_user(argp, &tac, sizeof tac)) goto out; r = 0; break; }; case KVM_SET_VAPIC_ADDR: { struct kvm_vapic_addr va; r = -EINVAL; if (!irqchip_in_kernel(vcpu->kvm)) goto out; r = -EFAULT; if (copy_from_user(&va, argp, sizeof va)) goto out; r = 0; kvm_lapic_set_vapic_addr(vcpu, va.vapic_addr); break; } case KVM_X86_SETUP_MCE: { u64 mcg_cap; r = -EFAULT; if (copy_from_user(&mcg_cap, argp, sizeof mcg_cap)) goto out; r = kvm_vcpu_ioctl_x86_setup_mce(vcpu, mcg_cap); break; } case KVM_X86_SET_MCE: { struct kvm_x86_mce mce; r = -EFAULT; if (copy_from_user(&mce, argp, sizeof mce)) goto out; r = kvm_vcpu_ioctl_x86_set_mce(vcpu, &mce); break; } case KVM_GET_VCPU_EVENTS: { struct kvm_vcpu_events events; kvm_vcpu_ioctl_x86_get_vcpu_events(vcpu, &events); r = -EFAULT; if (copy_to_user(argp, &events, sizeof(struct kvm_vcpu_events))) break; r = 0; break; } case KVM_SET_VCPU_EVENTS: { struct kvm_vcpu_events events; r = -EFAULT; if (copy_from_user(&events, argp, sizeof(struct kvm_vcpu_events))) break; r = kvm_vcpu_ioctl_x86_set_vcpu_events(vcpu, &events); break; } default: r = -EINVAL; } out: kfree(lapic); return r; } static int kvm_vm_ioctl_set_tss_addr(struct kvm *kvm, unsigned long addr) { int ret; if (addr > (unsigned int)(-3 * PAGE_SIZE)) return -1; ret = kvm_x86_ops->set_tss_addr(kvm, addr); return ret; } static int kvm_vm_ioctl_set_identity_map_addr(struct kvm *kvm, u64 ident_addr) { kvm->arch.ept_identity_map_addr = ident_addr; return 0; } static int kvm_vm_ioctl_set_nr_mmu_pages(struct kvm *kvm, u32 kvm_nr_mmu_pages) { if (kvm_nr_mmu_pages < KVM_MIN_ALLOC_MMU_PAGES) return -EINVAL; mutex_lock(&kvm->slots_lock); spin_lock(&kvm->mmu_lock); kvm_mmu_change_mmu_pages(kvm, kvm_nr_mmu_pages); kvm->arch.n_requested_mmu_pages = kvm_nr_mmu_pages; spin_unlock(&kvm->mmu_lock); mutex_unlock(&kvm->slots_lock); return 0; } static int kvm_vm_ioctl_get_nr_mmu_pages(struct kvm *kvm) { return kvm->arch.n_alloc_mmu_pages; } gfn_t unalias_gfn_instantiation(struct kvm *kvm, gfn_t gfn) { int i; struct kvm_mem_alias *alias; struct kvm_mem_aliases *aliases; aliases = rcu_dereference(kvm->arch.aliases); for (i = 0; i < aliases->naliases; ++i) { alias = &aliases->aliases[i]; if (alias->flags & KVM_ALIAS_INVALID) continue; if (gfn >= alias->base_gfn && gfn < alias->base_gfn + alias->npages) return alias->target_gfn + gfn - alias->base_gfn; } return gfn; } gfn_t unalias_gfn(struct kvm *kvm, gfn_t gfn) { int i; struct kvm_mem_alias *alias; struct kvm_mem_aliases *aliases; aliases = rcu_dereference(kvm->arch.aliases); for (i = 0; i < aliases->naliases; ++i) { alias = &aliases->aliases[i]; if (gfn >= alias->base_gfn && gfn < alias->base_gfn + alias->npages) return alias->target_gfn + gfn - alias->base_gfn; } return gfn; } /* * Set a new alias region. Aliases map a portion of physical memory into * another portion. This is useful for memory windows, for example the PC * VGA region. */ static int kvm_vm_ioctl_set_memory_alias(struct kvm *kvm, struct kvm_memory_alias *alias) { int r, n; struct kvm_mem_alias *p; struct kvm_mem_aliases *aliases, *old_aliases; r = -EINVAL; /* General sanity checks */ if (alias->memory_size & (PAGE_SIZE - 1)) goto out; if (alias->guest_phys_addr & (PAGE_SIZE - 1)) goto out; if (alias->slot >= KVM_ALIAS_SLOTS) goto out; if (alias->guest_phys_addr + alias->memory_size < alias->guest_phys_addr) goto out; if (alias->target_phys_addr + alias->memory_size < alias->target_phys_addr) goto out; r = -ENOMEM; aliases = kzalloc(sizeof(struct kvm_mem_aliases), GFP_KERNEL); if (!aliases) goto out; mutex_lock(&kvm->slots_lock); /* invalidate any gfn reference in case of deletion/shrinking */ memcpy(aliases, kvm->arch.aliases, sizeof(struct kvm_mem_aliases)); aliases->aliases[alias->slot].flags |= KVM_ALIAS_INVALID; old_aliases = kvm->arch.aliases; rcu_assign_pointer(kvm->arch.aliases, aliases); synchronize_srcu_expedited(&kvm->srcu); kvm_mmu_zap_all(kvm); kfree(old_aliases); r = -ENOMEM; aliases = kzalloc(sizeof(struct kvm_mem_aliases), GFP_KERNEL); if (!aliases) goto out_unlock; memcpy(aliases, kvm->arch.aliases, sizeof(struct kvm_mem_aliases)); p = &aliases->aliases[alias->slot]; p->base_gfn = alias->guest_phys_addr >> PAGE_SHIFT; p->npages = alias->memory_size >> PAGE_SHIFT; p->target_gfn = alias->target_phys_addr >> PAGE_SHIFT; p->flags &= ~(KVM_ALIAS_INVALID); for (n = KVM_ALIAS_SLOTS; n > 0; --n) if (aliases->aliases[n - 1].npages) break; aliases->naliases = n; old_aliases = kvm->arch.aliases; rcu_assign_pointer(kvm->arch.aliases, aliases); synchronize_srcu_expedited(&kvm->srcu); kfree(old_aliases); r = 0; out_unlock: mutex_unlock(&kvm->slots_lock); out: return r; } static int kvm_vm_ioctl_get_irqchip(struct kvm *kvm, struct kvm_irqchip *chip) { int r; r = 0; switch (chip->chip_id) { case KVM_IRQCHIP_PIC_MASTER: memcpy(&chip->chip.pic, &pic_irqchip(kvm)->pics[0], sizeof(struct kvm_pic_state)); break; case KVM_IRQCHIP_PIC_SLAVE: memcpy(&chip->chip.pic, &pic_irqchip(kvm)->pics[1], sizeof(struct kvm_pic_state)); break; case KVM_IRQCHIP_IOAPIC: r = kvm_get_ioapic(kvm, &chip->chip.ioapic); break; default: r = -EINVAL; break; } return r; } static int kvm_vm_ioctl_set_irqchip(struct kvm *kvm, struct kvm_irqchip *chip) { int r; r = 0; switch (chip->chip_id) { case KVM_IRQCHIP_PIC_MASTER: raw_spin_lock(&pic_irqchip(kvm)->lock); memcpy(&pic_irqchip(kvm)->pics[0], &chip->chip.pic, sizeof(struct kvm_pic_state)); raw_spin_unlock(&pic_irqchip(kvm)->lock); break; case KVM_IRQCHIP_PIC_SLAVE: raw_spin_lock(&pic_irqchip(kvm)->lock); memcpy(&pic_irqchip(kvm)->pics[1], &chip->chip.pic, sizeof(struct kvm_pic_state)); raw_spin_unlock(&pic_irqchip(kvm)->lock); break; case KVM_IRQCHIP_IOAPIC: r = kvm_set_ioapic(kvm, &chip->chip.ioapic); break; default: r = -EINVAL; break; } kvm_pic_update_irq(pic_irqchip(kvm)); return r; } static int kvm_vm_ioctl_get_pit(struct kvm *kvm, struct kvm_pit_state *ps) { int r = 0; mutex_lock(&kvm->arch.vpit->pit_state.lock); memcpy(ps, &kvm->arch.vpit->pit_state, sizeof(struct kvm_pit_state)); mutex_unlock(&kvm->arch.vpit->pit_state.lock); return r; } static int kvm_vm_ioctl_set_pit(struct kvm *kvm, struct kvm_pit_state *ps) { int r = 0; mutex_lock(&kvm->arch.vpit->pit_state.lock); memcpy(&kvm->arch.vpit->pit_state, ps, sizeof(struct kvm_pit_state)); kvm_pit_load_count(kvm, 0, ps->channels[0].count, 0); mutex_unlock(&kvm->arch.vpit->pit_state.lock); return r; } static int kvm_vm_ioctl_get_pit2(struct kvm *kvm, struct kvm_pit_state2 *ps) { int r = 0; mutex_lock(&kvm->arch.vpit->pit_state.lock); memcpy(ps->channels, &kvm->arch.vpit->pit_state.channels, sizeof(ps->channels)); ps->flags = kvm->arch.vpit->pit_state.flags; mutex_unlock(&kvm->arch.vpit->pit_state.lock); return r; } static int kvm_vm_ioctl_set_pit2(struct kvm *kvm, struct kvm_pit_state2 *ps) { int r = 0, start = 0; u32 prev_legacy, cur_legacy; mutex_lock(&kvm->arch.vpit->pit_state.lock); prev_legacy = kvm->arch.vpit->pit_state.flags & KVM_PIT_FLAGS_HPET_LEGACY; cur_legacy = ps->flags & KVM_PIT_FLAGS_HPET_LEGACY; if (!prev_legacy && cur_legacy) start = 1; memcpy(&kvm->arch.vpit->pit_state.channels, &ps->channels, sizeof(kvm->arch.vpit->pit_state.channels)); kvm->arch.vpit->pit_state.flags = ps->flags; kvm_pit_load_count(kvm, 0, kvm->arch.vpit->pit_state.channels[0].count, start); mutex_unlock(&kvm->arch.vpit->pit_state.lock); return r; } static int kvm_vm_ioctl_reinject(struct kvm *kvm, struct kvm_reinject_control *control) { if (!kvm->arch.vpit) return -ENXIO; mutex_lock(&kvm->arch.vpit->pit_state.lock); kvm->arch.vpit->pit_state.pit_timer.reinject = control->pit_reinject; mutex_unlock(&kvm->arch.vpit->pit_state.lock); return 0; } /* * Get (and clear) the dirty memory log for a memory slot. */ int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm, struct kvm_dirty_log *log) { int r, i; struct kvm_memory_slot *memslot; unsigned long n; unsigned long is_dirty = 0; unsigned long *dirty_bitmap = NULL; mutex_lock(&kvm->slots_lock); r = -EINVAL; if (log->slot >= KVM_MEMORY_SLOTS) goto out; memslot = &kvm->memslots->memslots[log->slot]; r = -ENOENT; if (!memslot->dirty_bitmap) goto out; n = kvm_dirty_bitmap_bytes(memslot); r = -ENOMEM; dirty_bitmap = vmalloc(n); if (!dirty_bitmap) goto out; memset(dirty_bitmap, 0, n); for (i = 0; !is_dirty && i < n/sizeof(long); i++) is_dirty = memslot->dirty_bitmap[i]; /* If nothing is dirty, don't bother messing with page tables. */ if (is_dirty) { struct kvm_memslots *slots, *old_slots; spin_lock(&kvm->mmu_lock); kvm_mmu_slot_remove_write_access(kvm, log->slot); spin_unlock(&kvm->mmu_lock); slots = kzalloc(sizeof(struct kvm_memslots), GFP_KERNEL); if (!slots) goto out_free; memcpy(slots, kvm->memslots, sizeof(struct kvm_memslots)); slots->memslots[log->slot].dirty_bitmap = dirty_bitmap; old_slots = kvm->memslots; rcu_assign_pointer(kvm->memslots, slots); synchronize_srcu_expedited(&kvm->srcu); dirty_bitmap = old_slots->memslots[log->slot].dirty_bitmap; kfree(old_slots); } r = 0; if (copy_to_user(log->dirty_bitmap, dirty_bitmap, n)) r = -EFAULT; out_free: vfree(dirty_bitmap); out: mutex_unlock(&kvm->slots_lock); return r; } long kvm_arch_vm_ioctl(struct file *filp, unsigned int ioctl, unsigned long arg) { struct kvm *kvm = filp->private_data; void __user *argp = (void __user *)arg; int r = -ENOTTY; /* * This union makes it completely explicit to gcc-3.x * that these two variables' stack usage should be * combined, not added together. */ union { struct kvm_pit_state ps; struct kvm_pit_state2 ps2; struct kvm_memory_alias alias; struct kvm_pit_config pit_config; } u; switch (ioctl) { case KVM_SET_TSS_ADDR: r = kvm_vm_ioctl_set_tss_addr(kvm, arg); if (r < 0) goto out; break; case KVM_SET_IDENTITY_MAP_ADDR: { u64 ident_addr; r = -EFAULT; if (copy_from_user(&ident_addr, argp, sizeof ident_addr)) goto out; r = kvm_vm_ioctl_set_identity_map_addr(kvm, ident_addr); if (r < 0) goto out; break; } case KVM_SET_MEMORY_REGION: { struct kvm_memory_region kvm_mem; struct kvm_userspace_memory_region kvm_userspace_mem; r = -EFAULT; if (copy_from_user(&kvm_mem, argp, sizeof kvm_mem)) goto out; kvm_userspace_mem.slot = kvm_mem.slot; kvm_userspace_mem.flags = kvm_mem.flags; kvm_userspace_mem.guest_phys_addr = kvm_mem.guest_phys_addr; kvm_userspace_mem.memory_size = kvm_mem.memory_size; r = kvm_vm_ioctl_set_memory_region(kvm, &kvm_userspace_mem, 0); if (r) goto out; break; } case KVM_SET_NR_MMU_PAGES: r = kvm_vm_ioctl_set_nr_mmu_pages(kvm, arg); if (r) goto out; break; case KVM_GET_NR_MMU_PAGES: r = kvm_vm_ioctl_get_nr_mmu_pages(kvm); break; case KVM_SET_MEMORY_ALIAS: r = -EFAULT; if (copy_from_user(&u.alias, argp, sizeof(struct kvm_memory_alias))) goto out; r = kvm_vm_ioctl_set_memory_alias(kvm, &u.alias); if (r) goto out; break; case KVM_CREATE_IRQCHIP: { struct kvm_pic *vpic; mutex_lock(&kvm->lock); r = -EEXIST; if (kvm->arch.vpic) goto create_irqchip_unlock; r = -ENOMEM; vpic = kvm_create_pic(kvm); if (vpic) { r = kvm_ioapic_init(kvm); if (r) { kvm_io_bus_unregister_dev(kvm, KVM_PIO_BUS, &vpic->dev); kfree(vpic); goto create_irqchip_unlock; } } else goto create_irqchip_unlock; smp_wmb(); kvm->arch.vpic = vpic; smp_wmb(); r = kvm_setup_default_irq_routing(kvm); if (r) { mutex_lock(&kvm->irq_lock); kvm_ioapic_destroy(kvm); kvm_destroy_pic(kvm); mutex_unlock(&kvm->irq_lock); } create_irqchip_unlock: mutex_unlock(&kvm->lock); break; } case KVM_CREATE_PIT: u.pit_config.flags = KVM_PIT_SPEAKER_DUMMY; goto create_pit; case KVM_CREATE_PIT2: r = -EFAULT; if (copy_from_user(&u.pit_config, argp, sizeof(struct kvm_pit_config))) goto out; create_pit: mutex_lock(&kvm->slots_lock); r = -EEXIST; if (kvm->arch.vpit) goto create_pit_unlock; r = -ENOMEM; kvm->arch.vpit = kvm_create_pit(kvm, u.pit_config.flags); if (kvm->arch.vpit) r = 0; create_pit_unlock: mutex_unlock(&kvm->slots_lock); break; case KVM_IRQ_LINE_STATUS: case KVM_IRQ_LINE: { struct kvm_irq_level irq_event; r = -EFAULT; if (copy_from_user(&irq_event, argp, sizeof irq_event)) goto out; if (irqchip_in_kernel(kvm)) { __s32 status; status = kvm_set_irq(kvm, KVM_USERSPACE_IRQ_SOURCE_ID, irq_event.irq, irq_event.level); if (ioctl == KVM_IRQ_LINE_STATUS) { irq_event.status = status; if (copy_to_user(argp, &irq_event, sizeof irq_event)) goto out; } r = 0; } break; } case KVM_GET_IRQCHIP: { /* 0: PIC master, 1: PIC slave, 2: IOAPIC */ struct kvm_irqchip *chip = kmalloc(sizeof(*chip), GFP_KERNEL); r = -ENOMEM; if (!chip) goto out; r = -EFAULT; if (copy_from_user(chip, argp, sizeof *chip)) goto get_irqchip_out; r = -ENXIO; if (!irqchip_in_kernel(kvm)) goto get_irqchip_out; r = kvm_vm_ioctl_get_irqchip(kvm, chip); if (r) goto get_irqchip_out; r = -EFAULT; if (copy_to_user(argp, chip, sizeof *chip)) goto get_irqchip_out; r = 0; get_irqchip_out: kfree(chip); if (r) goto out; break; } case KVM_SET_IRQCHIP: { /* 0: PIC master, 1: PIC slave, 2: IOAPIC */ struct kvm_irqchip *chip = kmalloc(sizeof(*chip), GFP_KERNEL); r = -ENOMEM; if (!chip) goto out; r = -EFAULT; if (copy_from_user(chip, argp, sizeof *chip)) goto set_irqchip_out; r = -ENXIO; if (!irqchip_in_kernel(kvm)) goto set_irqchip_out; r = kvm_vm_ioctl_set_irqchip(kvm, chip); if (r) goto set_irqchip_out; r = 0; set_irqchip_out: kfree(chip); if (r) goto out; break; } case KVM_GET_PIT: { r = -EFAULT; if (copy_from_user(&u.ps, argp, sizeof(struct kvm_pit_state))) goto out; r = -ENXIO; if (!kvm->arch.vpit) goto out; r = kvm_vm_ioctl_get_pit(kvm, &u.ps); if (r) goto out; r = -EFAULT; if (copy_to_user(argp, &u.ps, sizeof(struct kvm_pit_state))) goto out; r = 0; break; } case KVM_SET_PIT: { r = -EFAULT; if (copy_from_user(&u.ps, argp, sizeof u.ps)) goto out; r = -ENXIO; if (!kvm->arch.vpit) goto out; r = kvm_vm_ioctl_set_pit(kvm, &u.ps); if (r) goto out; r = 0; break; } case KVM_GET_PIT2: { r = -ENXIO; if (!kvm->arch.vpit) goto out; r = kvm_vm_ioctl_get_pit2(kvm, &u.ps2); if (r) goto out; r = -EFAULT; if (copy_to_user(argp, &u.ps2, sizeof(u.ps2))) goto out; r = 0; break; } case KVM_SET_PIT2: { r = -EFAULT; if (copy_from_user(&u.ps2, argp, sizeof(u.ps2))) goto out; r = -ENXIO; if (!kvm->arch.vpit) goto out; r = kvm_vm_ioctl_set_pit2(kvm, &u.ps2); if (r) goto out; r = 0; break; } case KVM_REINJECT_CONTROL: { struct kvm_reinject_control control; r = -EFAULT; if (copy_from_user(&control, argp, sizeof(control))) goto out; r = kvm_vm_ioctl_reinject(kvm, &control); if (r) goto out; r = 0; break; } case KVM_XEN_HVM_CONFIG: { r = -EFAULT; if (copy_from_user(&kvm->arch.xen_hvm_config, argp, sizeof(struct kvm_xen_hvm_config))) goto out; r = -EINVAL; if (kvm->arch.xen_hvm_config.flags) goto out; r = 0; break; } case KVM_SET_CLOCK: { struct timespec now; struct kvm_clock_data user_ns; u64 now_ns; s64 delta; r = -EFAULT; if (copy_from_user(&user_ns, argp, sizeof(user_ns))) goto out; r = -EINVAL; if (user_ns.flags) goto out; r = 0; ktime_get_ts(&now); now_ns = timespec_to_ns(&now); delta = user_ns.clock - now_ns; kvm->arch.kvmclock_offset = delta; break; } case KVM_GET_CLOCK: { struct timespec now; struct kvm_clock_data user_ns; u64 now_ns; ktime_get_ts(&now); now_ns = timespec_to_ns(&now); user_ns.clock = kvm->arch.kvmclock_offset + now_ns; user_ns.flags = 0; r = -EFAULT; if (copy_to_user(argp, &user_ns, sizeof(user_ns))) goto out; r = 0; break; } default: ; } out: return r; } static void kvm_init_msr_list(void) { u32 dummy[2]; unsigned i, j; /* skip the first msrs in the list. KVM-specific */ for (i = j = KVM_SAVE_MSRS_BEGIN; i < ARRAY_SIZE(msrs_to_save); i++) { if (rdmsr_safe(msrs_to_save[i], &dummy[0], &dummy[1]) < 0) continue; if (j < i) msrs_to_save[j] = msrs_to_save[i]; j++; } num_msrs_to_save = j; } static int vcpu_mmio_write(struct kvm_vcpu *vcpu, gpa_t addr, int len, const void *v) { if (vcpu->arch.apic && !kvm_iodevice_write(&vcpu->arch.apic->dev, addr, len, v)) return 0; return kvm_io_bus_write(vcpu->kvm, KVM_MMIO_BUS, addr, len, v); } static int vcpu_mmio_read(struct kvm_vcpu *vcpu, gpa_t addr, int len, void *v) { if (vcpu->arch.apic && !kvm_iodevice_read(&vcpu->arch.apic->dev, addr, len, v)) return 0; return kvm_io_bus_read(vcpu->kvm, KVM_MMIO_BUS, addr, len, v); } gpa_t kvm_mmu_gva_to_gpa_read(struct kvm_vcpu *vcpu, gva_t gva, u32 *error) { u32 access = (kvm_x86_ops->get_cpl(vcpu) == 3) ? PFERR_USER_MASK : 0; return vcpu->arch.mmu.gva_to_gpa(vcpu, gva, access, error); } gpa_t kvm_mmu_gva_to_gpa_fetch(struct kvm_vcpu *vcpu, gva_t gva, u32 *error) { u32 access = (kvm_x86_ops->get_cpl(vcpu) == 3) ? PFERR_USER_MASK : 0; access |= PFERR_FETCH_MASK; return vcpu->arch.mmu.gva_to_gpa(vcpu, gva, access, error); } gpa_t kvm_mmu_gva_to_gpa_write(struct kvm_vcpu *vcpu, gva_t gva, u32 *error) { u32 access = (kvm_x86_ops->get_cpl(vcpu) == 3) ? PFERR_USER_MASK : 0; access |= PFERR_WRITE_MASK; return vcpu->arch.mmu.gva_to_gpa(vcpu, gva, access, error); } /* uses this to access any guest's mapped memory without checking CPL */ gpa_t kvm_mmu_gva_to_gpa_system(struct kvm_vcpu *vcpu, gva_t gva, u32 *error) { return vcpu->arch.mmu.gva_to_gpa(vcpu, gva, 0, error); } static int kvm_read_guest_virt_helper(gva_t addr, void *val, unsigned int bytes, struct kvm_vcpu *vcpu, u32 access, u32 *error) { void *data = val; int r = X86EMUL_CONTINUE; while (bytes) { gpa_t gpa = vcpu->arch.mmu.gva_to_gpa(vcpu, addr, access, error); unsigned offset = addr & (PAGE_SIZE-1); unsigned toread = min(bytes, (unsigned)PAGE_SIZE - offset); int ret; if (gpa == UNMAPPED_GVA) { r = X86EMUL_PROPAGATE_FAULT; goto out; } ret = kvm_read_guest(vcpu->kvm, gpa, data, toread); if (ret < 0) { r = X86EMUL_UNHANDLEABLE; goto out; } bytes -= toread; data += toread; addr += toread; } out: return r; } /* used for instruction fetching */ static int kvm_fetch_guest_virt(gva_t addr, void *val, unsigned int bytes, struct kvm_vcpu *vcpu, u32 *error) { u32 access = (kvm_x86_ops->get_cpl(vcpu) == 3) ? PFERR_USER_MASK : 0; return kvm_read_guest_virt_helper(addr, val, bytes, vcpu, access | PFERR_FETCH_MASK, error); } static int kvm_read_guest_virt(gva_t addr, void *val, unsigned int bytes, struct kvm_vcpu *vcpu, u32 *error) { u32 access = (kvm_x86_ops->get_cpl(vcpu) == 3) ? PFERR_USER_MASK : 0; return kvm_read_guest_virt_helper(addr, val, bytes, vcpu, access, error); } static int kvm_read_guest_virt_system(gva_t addr, void *val, unsigned int bytes, struct kvm_vcpu *vcpu, u32 *error) { return kvm_read_guest_virt_helper(addr, val, bytes, vcpu, 0, error); } static int kvm_write_guest_virt(gva_t addr, void *val, unsigned int bytes, struct kvm_vcpu *vcpu, u32 *error) { void *data = val; int r = X86EMUL_CONTINUE; while (bytes) { gpa_t gpa = kvm_mmu_gva_to_gpa_write(vcpu, addr, error); unsigned offset = addr & (PAGE_SIZE-1); unsigned towrite = min(bytes, (unsigned)PAGE_SIZE - offset); int ret; if (gpa == UNMAPPED_GVA) { r = X86EMUL_PROPAGATE_FAULT; goto out; } ret = kvm_write_guest(vcpu->kvm, gpa, data, towrite); if (ret < 0) { r = X86EMUL_UNHANDLEABLE; goto out; } bytes -= towrite; data += towrite; addr += towrite; } out: return r; } static int emulator_read_emulated(unsigned long addr, void *val, unsigned int bytes, struct kvm_vcpu *vcpu) { gpa_t gpa; u32 error_code; if (vcpu->mmio_read_completed) { memcpy(val, vcpu->mmio_data, bytes); trace_kvm_mmio(KVM_TRACE_MMIO_READ, bytes, vcpu->mmio_phys_addr, *(u64 *)val); vcpu->mmio_read_completed = 0; return X86EMUL_CONTINUE; } gpa = kvm_mmu_gva_to_gpa_read(vcpu, addr, &error_code); if (gpa == UNMAPPED_GVA) { kvm_inject_page_fault(vcpu, addr, error_code); return X86EMUL_PROPAGATE_FAULT; } /* For APIC access vmexit */ if ((gpa & PAGE_MASK) == APIC_DEFAULT_PHYS_BASE) goto mmio; if (kvm_read_guest_virt(addr, val, bytes, vcpu, NULL) == X86EMUL_CONTINUE) return X86EMUL_CONTINUE; mmio: /* * Is this MMIO handled locally? */ if (!vcpu_mmio_read(vcpu, gpa, bytes, val)) { trace_kvm_mmio(KVM_TRACE_MMIO_READ, bytes, gpa, *(u64 *)val); return X86EMUL_CONTINUE; } trace_kvm_mmio(KVM_TRACE_MMIO_READ_UNSATISFIED, bytes, gpa, 0); vcpu->mmio_needed = 1; vcpu->mmio_phys_addr = gpa; vcpu->mmio_size = bytes; vcpu->mmio_is_write = 0; return X86EMUL_UNHANDLEABLE; } int emulator_write_phys(struct kvm_vcpu *vcpu, gpa_t gpa, const void *val, int bytes) { int ret; ret = kvm_write_guest(vcpu->kvm, gpa, val, bytes); if (ret < 0) return 0; kvm_mmu_pte_write(vcpu, gpa, val, bytes, 1); return 1; } static int emulator_write_emulated_onepage(unsigned long addr, const void *val, unsigned int bytes, struct kvm_vcpu *vcpu) { gpa_t gpa; u32 error_code; gpa = kvm_mmu_gva_to_gpa_write(vcpu, addr, &error_code); if (gpa == UNMAPPED_GVA) { kvm_inject_page_fault(vcpu, addr, error_code); return X86EMUL_PROPAGATE_FAULT; } /* For APIC access vmexit */ if ((gpa & PAGE_MASK) == APIC_DEFAULT_PHYS_BASE) goto mmio; if (emulator_write_phys(vcpu, gpa, val, bytes)) return X86EMUL_CONTINUE; mmio: trace_kvm_mmio(KVM_TRACE_MMIO_WRITE, bytes, gpa, *(u64 *)val); /* * Is this MMIO handled locally? */ if (!vcpu_mmio_write(vcpu, gpa, bytes, val)) return X86EMUL_CONTINUE; vcpu->mmio_needed = 1; vcpu->mmio_phys_addr = gpa; vcpu->mmio_size = bytes; vcpu->mmio_is_write = 1; memcpy(vcpu->mmio_data, val, bytes); return X86EMUL_CONTINUE; } int emulator_write_emulated(unsigned long addr, const void *val, unsigned int bytes, struct kvm_vcpu *vcpu) { /* Crossing a page boundary? */ if (((addr + bytes - 1) ^ addr) & PAGE_MASK) { int rc, now; now = -addr & ~PAGE_MASK; rc = emulator_write_emulated_onepage(addr, val, now, vcpu); if (rc != X86EMUL_CONTINUE) return rc; addr += now; val += now; bytes -= now; } return emulator_write_emulated_onepage(addr, val, bytes, vcpu); } EXPORT_SYMBOL_GPL(emulator_write_emulated); static int emulator_cmpxchg_emulated(unsigned long addr, const void *old, const void *new, unsigned int bytes, struct kvm_vcpu *vcpu) { printk_once(KERN_WARNING "kvm: emulating exchange as write\n"); #ifndef CONFIG_X86_64 /* guests cmpxchg8b have to be emulated atomically */ if (bytes == 8) { gpa_t gpa; struct page *page; char *kaddr; u64 val; gpa = kvm_mmu_gva_to_gpa_write(vcpu, addr, NULL); if (gpa == UNMAPPED_GVA || (gpa & PAGE_MASK) == APIC_DEFAULT_PHYS_BASE) goto emul_write; if (((gpa + bytes - 1) & PAGE_MASK) != (gpa & PAGE_MASK)) goto emul_write; val = *(u64 *)new; page = gfn_to_page(vcpu->kvm, gpa >> PAGE_SHIFT); kaddr = kmap_atomic(page, KM_USER0); set_64bit((u64 *)(kaddr + offset_in_page(gpa)), val); kunmap_atomic(kaddr, KM_USER0); kvm_release_page_dirty(page); } emul_write: #endif return emulator_write_emulated(addr, new, bytes, vcpu); } static unsigned long get_segment_base(struct kvm_vcpu *vcpu, int seg) { return kvm_x86_ops->get_segment_base(vcpu, seg); } int emulate_invlpg(struct kvm_vcpu *vcpu, gva_t address) { kvm_mmu_invlpg(vcpu, address); return X86EMUL_CONTINUE; } int emulate_clts(struct kvm_vcpu *vcpu) { kvm_x86_ops->set_cr0(vcpu, kvm_read_cr0_bits(vcpu, ~X86_CR0_TS)); kvm_x86_ops->fpu_activate(vcpu); return X86EMUL_CONTINUE; } int emulator_get_dr(struct x86_emulate_ctxt *ctxt, int dr, unsigned long *dest) { return kvm_x86_ops->get_dr(ctxt->vcpu, dr, dest); } int emulator_set_dr(struct x86_emulate_ctxt *ctxt, int dr, unsigned long value) { unsigned long mask = (ctxt->mode == X86EMUL_MODE_PROT64) ? ~0ULL : ~0U; return kvm_x86_ops->set_dr(ctxt->vcpu, dr, value & mask); } void kvm_report_emulation_failure(struct kvm_vcpu *vcpu, const char *context) { u8 opcodes[4]; unsigned long rip = kvm_rip_read(vcpu); unsigned long rip_linear; if (!printk_ratelimit()) return; rip_linear = rip + get_segment_base(vcpu, VCPU_SREG_CS); kvm_read_guest_virt(rip_linear, (void *)opcodes, 4, vcpu, NULL); printk(KERN_ERR "emulation failed (%s) rip %lx %02x %02x %02x %02x\n", context, rip, opcodes[0], opcodes[1], opcodes[2], opcodes[3]); } EXPORT_SYMBOL_GPL(kvm_report_emulation_failure); static struct x86_emulate_ops emulate_ops = { .read_std = kvm_read_guest_virt_system, .fetch = kvm_fetch_guest_virt, .read_emulated = emulator_read_emulated, .write_emulated = emulator_write_emulated, .cmpxchg_emulated = emulator_cmpxchg_emulated, }; static void cache_all_regs(struct kvm_vcpu *vcpu) { kvm_register_read(vcpu, VCPU_REGS_RAX); kvm_register_read(vcpu, VCPU_REGS_RSP); kvm_register_read(vcpu, VCPU_REGS_RIP); vcpu->arch.regs_dirty = ~0; } int emulate_instruction(struct kvm_vcpu *vcpu, unsigned long cr2, u16 error_code, int emulation_type) { int r, shadow_mask; struct decode_cache *c; struct kvm_run *run = vcpu->run; kvm_clear_exception_queue(vcpu); vcpu->arch.mmio_fault_cr2 = cr2; /* * TODO: fix emulate.c to use guest_read/write_register * instead of direct ->regs accesses, can save hundred cycles * on Intel for instructions that don't read/change RSP, for * for example. */ cache_all_regs(vcpu); vcpu->mmio_is_write = 0; vcpu->arch.pio.string = 0; if (!(emulation_type & EMULTYPE_NO_DECODE)) { int cs_db, cs_l; kvm_x86_ops->get_cs_db_l_bits(vcpu, &cs_db, &cs_l); vcpu->arch.emulate_ctxt.vcpu = vcpu; vcpu->arch.emulate_ctxt.eflags = kvm_get_rflags(vcpu); vcpu->arch.emulate_ctxt.mode = (!is_protmode(vcpu)) ? X86EMUL_MODE_REAL : (vcpu->arch.emulate_ctxt.eflags & X86_EFLAGS_VM) ? X86EMUL_MODE_VM86 : cs_l ? X86EMUL_MODE_PROT64 : cs_db ? X86EMUL_MODE_PROT32 : X86EMUL_MODE_PROT16; r = x86_decode_insn(&vcpu->arch.emulate_ctxt, &emulate_ops); /* Only allow emulation of specific instructions on #UD * (namely VMMCALL, sysenter, sysexit, syscall)*/ c = &vcpu->arch.emulate_ctxt.decode; if (emulation_type & EMULTYPE_TRAP_UD) { if (!c->twobyte) return EMULATE_FAIL; switch (c->b) { case 0x01: /* VMMCALL */ if (c->modrm_mod != 3 || c->modrm_rm != 1) return EMULATE_FAIL; break; case 0x34: /* sysenter */ case 0x35: /* sysexit */ if (c->modrm_mod != 0 || c->modrm_rm != 0) return EMULATE_FAIL; break; case 0x05: /* syscall */ if (c->modrm_mod != 0 || c->modrm_rm != 0) return EMULATE_FAIL; break; default: return EMULATE_FAIL; } if (!(c->modrm_reg == 0 || c->modrm_reg == 3)) return EMULATE_FAIL; } ++vcpu->stat.insn_emulation; if (r) { ++vcpu->stat.insn_emulation_fail; if (kvm_mmu_unprotect_page_virt(vcpu, cr2)) return EMULATE_DONE; return EMULATE_FAIL; } } if (emulation_type & EMULTYPE_SKIP) { kvm_rip_write(vcpu, vcpu->arch.emulate_ctxt.decode.eip); return EMULATE_DONE; } r = x86_emulate_insn(&vcpu->arch.emulate_ctxt, &emulate_ops); shadow_mask = vcpu->arch.emulate_ctxt.interruptibility; if (r == 0) kvm_x86_ops->set_interrupt_shadow(vcpu, shadow_mask); if (vcpu->arch.pio.string) return EMULATE_DO_MMIO; if (r || vcpu->mmio_is_write) { run->exit_reason = KVM_EXIT_MMIO; run->mmio.phys_addr = vcpu->mmio_phys_addr; memcpy(run->mmio.data, vcpu->mmio_data, 8); run->mmio.len = vcpu->mmio_size; run->mmio.is_write = vcpu->mmio_is_write; } if (r) { if (kvm_mmu_unprotect_page_virt(vcpu, cr2)) return EMULATE_DONE; if (!vcpu->mmio_needed) { kvm_report_emulation_failure(vcpu, "mmio"); return EMULATE_FAIL; } return EMULATE_DO_MMIO; } kvm_set_rflags(vcpu, vcpu->arch.emulate_ctxt.eflags); if (vcpu->mmio_is_write) { vcpu->mmio_needed = 0; return EMULATE_DO_MMIO; } return EMULATE_DONE; } EXPORT_SYMBOL_GPL(emulate_instruction); static int pio_copy_data(struct kvm_vcpu *vcpu) { void *p = vcpu->arch.pio_data; gva_t q = vcpu->arch.pio.guest_gva; unsigned bytes; int ret; u32 error_code; bytes = vcpu->arch.pio.size * vcpu->arch.pio.cur_count; if (vcpu->arch.pio.in) ret = kvm_write_guest_virt(q, p, bytes, vcpu, &error_code); else ret = kvm_read_guest_virt(q, p, bytes, vcpu, &error_code); if (ret == X86EMUL_PROPAGATE_FAULT) kvm_inject_page_fault(vcpu, q, error_code); return ret; } int complete_pio(struct kvm_vcpu *vcpu) { struct kvm_pio_request *io = &vcpu->arch.pio; long delta; int r; unsigned long val; if (!io->string) { if (io->in) { val = kvm_register_read(vcpu, VCPU_REGS_RAX); memcpy(&val, vcpu->arch.pio_data, io->size); kvm_register_write(vcpu, VCPU_REGS_RAX, val); } } else { if (io->in) { r = pio_copy_data(vcpu); if (r) goto out; } delta = 1; if (io->rep) { delta *= io->cur_count; /* * The size of the register should really depend on * current address size. */ val = kvm_register_read(vcpu, VCPU_REGS_RCX); val -= delta; kvm_register_write(vcpu, VCPU_REGS_RCX, val); } if (io->down) delta = -delta; delta *= io->size; if (io->in) { val = kvm_register_read(vcpu, VCPU_REGS_RDI); val += delta; kvm_register_write(vcpu, VCPU_REGS_RDI, val); } else { val = kvm_register_read(vcpu, VCPU_REGS_RSI); val += delta; kvm_register_write(vcpu, VCPU_REGS_RSI, val); } } out: io->count -= io->cur_count; io->cur_count = 0; return 0; } static int kernel_pio(struct kvm_vcpu *vcpu, void *pd) { /* TODO: String I/O for in kernel device */ int r; if (vcpu->arch.pio.in) r = kvm_io_bus_read(vcpu->kvm, KVM_PIO_BUS, vcpu->arch.pio.port, vcpu->arch.pio.size, pd); else r = kvm_io_bus_write(vcpu->kvm, KVM_PIO_BUS, vcpu->arch.pio.port, vcpu->arch.pio.size, pd); return r; } static int pio_string_write(struct kvm_vcpu *vcpu) { struct kvm_pio_request *io = &vcpu->arch.pio; void *pd = vcpu->arch.pio_data; int i, r = 0; for (i = 0; i < io->cur_count; i++) { if (kvm_io_bus_write(vcpu->kvm, KVM_PIO_BUS, io->port, io->size, pd)) { r = -EOPNOTSUPP; break; } pd += io->size; } return r; } int kvm_emulate_pio(struct kvm_vcpu *vcpu, int in, int size, unsigned port) { unsigned long val; trace_kvm_pio(!in, port, size, 1); vcpu->run->exit_reason = KVM_EXIT_IO; vcpu->run->io.direction = in ? KVM_EXIT_IO_IN : KVM_EXIT_IO_OUT; vcpu->run->io.size = vcpu->arch.pio.size = size; vcpu->run->io.data_offset = KVM_PIO_PAGE_OFFSET * PAGE_SIZE; vcpu->run->io.count = vcpu->arch.pio.count = vcpu->arch.pio.cur_count = 1; vcpu->run->io.port = vcpu->arch.pio.port = port; vcpu->arch.pio.in = in; vcpu->arch.pio.string = 0; vcpu->arch.pio.down = 0; vcpu->arch.pio.rep = 0; if (!vcpu->arch.pio.in) { val = kvm_register_read(vcpu, VCPU_REGS_RAX); memcpy(vcpu->arch.pio_data, &val, 4); } if (!kernel_pio(vcpu, vcpu->arch.pio_data)) { complete_pio(vcpu); return 1; } return 0; } EXPORT_SYMBOL_GPL(kvm_emulate_pio); int kvm_emulate_pio_string(struct kvm_vcpu *vcpu, int in, int size, unsigned long count, int down, gva_t address, int rep, unsigned port) { unsigned now, in_page; int ret = 0; trace_kvm_pio(!in, port, size, count); vcpu->run->exit_reason = KVM_EXIT_IO; vcpu->run->io.direction = in ? KVM_EXIT_IO_IN : KVM_EXIT_IO_OUT; vcpu->run->io.size = vcpu->arch.pio.size = size; vcpu->run->io.data_offset = KVM_PIO_PAGE_OFFSET * PAGE_SIZE; vcpu->run->io.count = vcpu->arch.pio.count = vcpu->arch.pio.cur_count = count; vcpu->run->io.port = vcpu->arch.pio.port = port; vcpu->arch.pio.in = in; vcpu->arch.pio.string = 1; vcpu->arch.pio.down = down; vcpu->arch.pio.rep = rep; if (!count) { kvm_x86_ops->skip_emulated_instruction(vcpu); return 1; } if (!down) in_page = PAGE_SIZE - offset_in_page(address); else in_page = offset_in_page(address) + size; now = min(count, (unsigned long)in_page / size); if (!now) now = 1; if (down) { /* * String I/O in reverse. Yuck. Kill the guest, fix later. */ pr_unimpl(vcpu, "guest string pio down\n"); kvm_inject_gp(vcpu, 0); return 1; } vcpu->run->io.count = now; vcpu->arch.pio.cur_count = now; if (vcpu->arch.pio.cur_count == vcpu->arch.pio.count) kvm_x86_ops->skip_emulated_instruction(vcpu); vcpu->arch.pio.guest_gva = address; if (!vcpu->arch.pio.in) { /* string PIO write */ ret = pio_copy_data(vcpu); if (ret == X86EMUL_PROPAGATE_FAULT) return 1; if (ret == 0 && !pio_string_write(vcpu)) { complete_pio(vcpu); if (vcpu->arch.pio.count == 0) ret = 1; } } /* no string PIO read support yet */ return ret; } EXPORT_SYMBOL_GPL(kvm_emulate_pio_string); static void bounce_off(void *info) { /* nothing */ } static int kvmclock_cpufreq_notifier(struct notifier_block *nb, unsigned long val, void *data) { struct cpufreq_freqs *freq = data; struct kvm *kvm; struct kvm_vcpu *vcpu; int i, send_ipi = 0; if (val == CPUFREQ_PRECHANGE && freq->old > freq->new) return 0; if (val == CPUFREQ_POSTCHANGE && freq->old < freq->new) return 0; per_cpu(cpu_tsc_khz, freq->cpu) = freq->new; spin_lock(&kvm_lock); list_for_each_entry(kvm, &vm_list, vm_list) { kvm_for_each_vcpu(i, vcpu, kvm) { if (vcpu->cpu != freq->cpu) continue; if (!kvm_request_guest_time_update(vcpu)) continue; if (vcpu->cpu != smp_processor_id()) send_ipi++; } } spin_unlock(&kvm_lock); if (freq->old < freq->new && send_ipi) { /* * We upscale the frequency. Must make the guest * doesn't see old kvmclock values while running with * the new frequency, otherwise we risk the guest sees * time go backwards. * * In case we update the frequency for another cpu * (which might be in guest context) send an interrupt * to kick the cpu out of guest context. Next time * guest context is entered kvmclock will be updated, * so the guest will not see stale values. */ smp_call_function_single(freq->cpu, bounce_off, NULL, 1); } return 0; } static struct notifier_block kvmclock_cpufreq_notifier_block = { .notifier_call = kvmclock_cpufreq_notifier }; static void kvm_timer_init(void) { int cpu; if (!boot_cpu_has(X86_FEATURE_CONSTANT_TSC)) { cpufreq_register_notifier(&kvmclock_cpufreq_notifier_block, CPUFREQ_TRANSITION_NOTIFIER); for_each_online_cpu(cpu) { unsigned long khz = cpufreq_get(cpu); if (!khz) khz = tsc_khz; per_cpu(cpu_tsc_khz, cpu) = khz; } } else { for_each_possible_cpu(cpu) per_cpu(cpu_tsc_khz, cpu) = tsc_khz; } } int kvm_arch_init(void *opaque) { int r; struct kvm_x86_ops *ops = (struct kvm_x86_ops *)opaque; if (kvm_x86_ops) { printk(KERN_ERR "kvm: already loaded the other module\n"); r = -EEXIST; goto out; } if (!ops->cpu_has_kvm_support()) { printk(KERN_ERR "kvm: no hardware support\n"); r = -EOPNOTSUPP; goto out; } if (ops->disabled_by_bios()) { printk(KERN_ERR "kvm: disabled by bios\n"); r = -EOPNOTSUPP; goto out; } r = kvm_mmu_module_init(); if (r) goto out; kvm_init_msr_list(); kvm_x86_ops = ops; kvm_mmu_set_nonpresent_ptes(0ull, 0ull); kvm_mmu_set_base_ptes(PT_PRESENT_MASK); kvm_mmu_set_mask_ptes(PT_USER_MASK, PT_ACCESSED_MASK, PT_DIRTY_MASK, PT64_NX_MASK, 0); kvm_timer_init(); return 0; out: return r; } void kvm_arch_exit(void) { if (!boot_cpu_has(X86_FEATURE_CONSTANT_TSC)) cpufreq_unregister_notifier(&kvmclock_cpufreq_notifier_block, CPUFREQ_TRANSITION_NOTIFIER); kvm_x86_ops = NULL; kvm_mmu_module_exit(); } int kvm_emulate_halt(struct kvm_vcpu *vcpu) { ++vcpu->stat.halt_exits; if (irqchip_in_kernel(vcpu->kvm)) { vcpu->arch.mp_state = KVM_MP_STATE_HALTED; return 1; } else { vcpu->run->exit_reason = KVM_EXIT_HLT; return 0; } } EXPORT_SYMBOL_GPL(kvm_emulate_halt); static inline gpa_t hc_gpa(struct kvm_vcpu *vcpu, unsigned long a0, unsigned long a1) { if (is_long_mode(vcpu)) return a0; else return a0 | ((gpa_t)a1 << 32); } int kvm_hv_hypercall(struct kvm_vcpu *vcpu) { u64 param, ingpa, outgpa, ret; uint16_t code, rep_idx, rep_cnt, res = HV_STATUS_SUCCESS, rep_done = 0; bool fast, longmode; int cs_db, cs_l; /* * hypercall generates UD from non zero cpl and real mode * per HYPER-V spec */ if (kvm_x86_ops->get_cpl(vcpu) != 0 || !is_protmode(vcpu)) { kvm_queue_exception(vcpu, UD_VECTOR); return 0; } kvm_x86_ops->get_cs_db_l_bits(vcpu, &cs_db, &cs_l); longmode = is_long_mode(vcpu) && cs_l == 1; if (!longmode) { param = ((u64)kvm_register_read(vcpu, VCPU_REGS_RDX) << 32) | (kvm_register_read(vcpu, VCPU_REGS_RAX) & 0xffffffff); ingpa = ((u64)kvm_register_read(vcpu, VCPU_REGS_RBX) << 32) | (kvm_register_read(vcpu, VCPU_REGS_RCX) & 0xffffffff); outgpa = ((u64)kvm_register_read(vcpu, VCPU_REGS_RDI) << 32) | (kvm_register_read(vcpu, VCPU_REGS_RSI) & 0xffffffff); } #ifdef CONFIG_X86_64 else { param = kvm_register_read(vcpu, VCPU_REGS_RCX); ingpa = kvm_register_read(vcpu, VCPU_REGS_RDX); outgpa = kvm_register_read(vcpu, VCPU_REGS_R8); } #endif code = param & 0xffff; fast = (param >> 16) & 0x1; rep_cnt = (param >> 32) & 0xfff; rep_idx = (param >> 48) & 0xfff; trace_kvm_hv_hypercall(code, fast, rep_cnt, rep_idx, ingpa, outgpa); switch (code) { case HV_X64_HV_NOTIFY_LONG_SPIN_WAIT: kvm_vcpu_on_spin(vcpu); break; default: res = HV_STATUS_INVALID_HYPERCALL_CODE; break; } ret = res | (((u64)rep_done & 0xfff) << 32); if (longmode) { kvm_register_write(vcpu, VCPU_REGS_RAX, ret); } else { kvm_register_write(vcpu, VCPU_REGS_RDX, ret >> 32); kvm_register_write(vcpu, VCPU_REGS_RAX, ret & 0xffffffff); } return 1; } int kvm_emulate_hypercall(struct kvm_vcpu *vcpu) { unsigned long nr, a0, a1, a2, a3, ret; int r = 1; if (kvm_hv_hypercall_enabled(vcpu->kvm)) return kvm_hv_hypercall(vcpu); nr = kvm_register_read(vcpu, VCPU_REGS_RAX); a0 = kvm_register_read(vcpu, VCPU_REGS_RBX); a1 = kvm_register_read(vcpu, VCPU_REGS_RCX); a2 = kvm_register_read(vcpu, VCPU_REGS_RDX); a3 = kvm_register_read(vcpu, VCPU_REGS_RSI); trace_kvm_hypercall(nr, a0, a1, a2, a3); if (!is_long_mode(vcpu)) { nr &= 0xFFFFFFFF; a0 &= 0xFFFFFFFF; a1 &= 0xFFFFFFFF; a2 &= 0xFFFFFFFF; a3 &= 0xFFFFFFFF; } if (kvm_x86_ops->get_cpl(vcpu) != 0) { ret = -KVM_EPERM; goto out; } switch (nr) { case KVM_HC_VAPIC_POLL_IRQ: ret = 0; break; case KVM_HC_MMU_OP: r = kvm_pv_mmu_op(vcpu, a0, hc_gpa(vcpu, a1, a2), &ret); break; default: ret = -KVM_ENOSYS; break; } out: kvm_register_write(vcpu, VCPU_REGS_RAX, ret); ++vcpu->stat.hypercalls; return r; } EXPORT_SYMBOL_GPL(kvm_emulate_hypercall); int kvm_fix_hypercall(struct kvm_vcpu *vcpu) { char instruction[3]; unsigned long rip = kvm_rip_read(vcpu); /* * Blow out the MMU to ensure that no other VCPU has an active mapping * to ensure that the updated hypercall appears atomically across all * VCPUs. */ kvm_mmu_zap_all(vcpu->kvm); kvm_x86_ops->patch_hypercall(vcpu, instruction); return emulator_write_emulated(rip, instruction, 3, vcpu); } static u64 mk_cr_64(u64 curr_cr, u32 new_val) { return (curr_cr & ~((1ULL << 32) - 1)) | new_val; } void realmode_lgdt(struct kvm_vcpu *vcpu, u16 limit, unsigned long base) { struct desc_ptr dt = { limit, base }; kvm_x86_ops->set_gdt(vcpu, &dt); } void realmode_lidt(struct kvm_vcpu *vcpu, u16 limit, unsigned long base) { struct desc_ptr dt = { limit, base }; kvm_x86_ops->set_idt(vcpu, &dt); } void realmode_lmsw(struct kvm_vcpu *vcpu, unsigned long msw, unsigned long *rflags) { kvm_lmsw(vcpu, msw); *rflags = kvm_get_rflags(vcpu); } unsigned long realmode_get_cr(struct kvm_vcpu *vcpu, int cr) { unsigned long value; switch (cr) { case 0: value = kvm_read_cr0(vcpu); break; case 2: value = vcpu->arch.cr2; break; case 3: value = vcpu->arch.cr3; break; case 4: value = kvm_read_cr4(vcpu); break; case 8: value = kvm_get_cr8(vcpu); break; default: vcpu_printf(vcpu, "%s: unexpected cr %u\n", __func__, cr); return 0; } return value; } void realmode_set_cr(struct kvm_vcpu *vcpu, int cr, unsigned long val, unsigned long *rflags) { switch (cr) { case 0: kvm_set_cr0(vcpu, mk_cr_64(kvm_read_cr0(vcpu), val)); *rflags = kvm_get_rflags(vcpu); break; case 2: vcpu->arch.cr2 = val; break; case 3: kvm_set_cr3(vcpu, val); break; case 4: kvm_set_cr4(vcpu, mk_cr_64(kvm_read_cr4(vcpu), val)); break; case 8: kvm_set_cr8(vcpu, val & 0xfUL); break; default: vcpu_printf(vcpu, "%s: unexpected cr %u\n", __func__, cr); } } static int move_to_next_stateful_cpuid_entry(struct kvm_vcpu *vcpu, int i) { struct kvm_cpuid_entry2 *e = &vcpu->arch.cpuid_entries[i]; int j, nent = vcpu->arch.cpuid_nent; e->flags &= ~KVM_CPUID_FLAG_STATE_READ_NEXT; /* when no next entry is found, the current entry[i] is reselected */ for (j = i + 1; ; j = (j + 1) % nent) { struct kvm_cpuid_entry2 *ej = &vcpu->arch.cpuid_entries[j]; if (ej->function == e->function) { ej->flags |= KVM_CPUID_FLAG_STATE_READ_NEXT; return j; } } return 0; /* silence gcc, even though control never reaches here */ } /* find an entry with matching function, matching index (if needed), and that * should be read next (if it's stateful) */ static int is_matching_cpuid_entry(struct kvm_cpuid_entry2 *e, u32 function, u32 index) { if (e->function != function) return 0; if ((e->flags & KVM_CPUID_FLAG_SIGNIFCANT_INDEX) && e->index != index) return 0; if ((e->flags & KVM_CPUID_FLAG_STATEFUL_FUNC) && !(e->flags & KVM_CPUID_FLAG_STATE_READ_NEXT)) return 0; return 1; } struct kvm_cpuid_entry2 *kvm_find_cpuid_entry(struct kvm_vcpu *vcpu, u32 function, u32 index) { int i; struct kvm_cpuid_entry2 *best = NULL; for (i = 0; i < vcpu->arch.cpuid_nent; ++i) { struct kvm_cpuid_entry2 *e; e = &vcpu->arch.cpuid_entries[i]; if (is_matching_cpuid_entry(e, function, index)) { if (e->flags & KVM_CPUID_FLAG_STATEFUL_FUNC) move_to_next_stateful_cpuid_entry(vcpu, i); best = e; break; } /* * Both basic or both extended? */ if (((e->function ^ function) & 0x80000000) == 0) if (!best || e->function > best->function) best = e; } return best; } EXPORT_SYMBOL_GPL(kvm_find_cpuid_entry); int cpuid_maxphyaddr(struct kvm_vcpu *vcpu) { struct kvm_cpuid_entry2 *best; best = kvm_find_cpuid_entry(vcpu, 0x80000008, 0); if (best) return best->eax & 0xff; return 36; } void kvm_emulate_cpuid(struct kvm_vcpu *vcpu) { u32 function, index; struct kvm_cpuid_entry2 *best; function = kvm_register_read(vcpu, VCPU_REGS_RAX); index = kvm_register_read(vcpu, VCPU_REGS_RCX); kvm_register_write(vcpu, VCPU_REGS_RAX, 0); kvm_register_write(vcpu, VCPU_REGS_RBX, 0); kvm_register_write(vcpu, VCPU_REGS_RCX, 0); kvm_register_write(vcpu, VCPU_REGS_RDX, 0); best = kvm_find_cpuid_entry(vcpu, function, index); if (best) { kvm_register_write(vcpu, VCPU_REGS_RAX, best->eax); kvm_register_write(vcpu, VCPU_REGS_RBX, best->ebx); kvm_register_write(vcpu, VCPU_REGS_RCX, best->ecx); kvm_register_write(vcpu, VCPU_REGS_RDX, best->edx); } kvm_x86_ops->skip_emulated_instruction(vcpu); trace_kvm_cpuid(function, kvm_register_read(vcpu, VCPU_REGS_RAX), kvm_register_read(vcpu, VCPU_REGS_RBX), kvm_register_read(vcpu, VCPU_REGS_RCX), kvm_register_read(vcpu, VCPU_REGS_RDX)); } EXPORT_SYMBOL_GPL(kvm_emulate_cpuid); /* * Check if userspace requested an interrupt window, and that the * interrupt window is open. * * No need to exit to userspace if we already have an interrupt queued. */ static int dm_request_for_irq_injection(struct kvm_vcpu *vcpu) { return (!irqchip_in_kernel(vcpu->kvm) && !kvm_cpu_has_interrupt(vcpu) && vcpu->run->request_interrupt_window && kvm_arch_interrupt_allowed(vcpu)); } static void post_kvm_run_save(struct kvm_vcpu *vcpu) { struct kvm_run *kvm_run = vcpu->run; kvm_run->if_flag = (kvm_get_rflags(vcpu) & X86_EFLAGS_IF) != 0; kvm_run->cr8 = kvm_get_cr8(vcpu); kvm_run->apic_base = kvm_get_apic_base(vcpu); if (irqchip_in_kernel(vcpu->kvm)) kvm_run->ready_for_interrupt_injection = 1; else kvm_run->ready_for_interrupt_injection = kvm_arch_interrupt_allowed(vcpu) && !kvm_cpu_has_interrupt(vcpu) && !kvm_event_needs_reinjection(vcpu); } static void vapic_enter(struct kvm_vcpu *vcpu) { struct kvm_lapic *apic = vcpu->arch.apic; struct page *page; if (!apic || !apic->vapic_addr) return; page = gfn_to_page(vcpu->kvm, apic->vapic_addr >> PAGE_SHIFT); vcpu->arch.apic->vapic_page = page; } static void vapic_exit(struct kvm_vcpu *vcpu) { struct kvm_lapic *apic = vcpu->arch.apic; int idx; if (!apic || !apic->vapic_addr) return; idx = srcu_read_lock(&vcpu->kvm->srcu); kvm_release_page_dirty(apic->vapic_page); mark_page_dirty(vcpu->kvm, apic->vapic_addr >> PAGE_SHIFT); srcu_read_unlock(&vcpu->kvm->srcu, idx); } static void update_cr8_intercept(struct kvm_vcpu *vcpu) { int max_irr, tpr; if (!kvm_x86_ops->update_cr8_intercept) return; if (!vcpu->arch.apic) return; if (!vcpu->arch.apic->vapic_addr) max_irr = kvm_lapic_find_highest_irr(vcpu); else max_irr = -1; if (max_irr != -1) max_irr >>= 4; tpr = kvm_lapic_get_cr8(vcpu); kvm_x86_ops->update_cr8_intercept(vcpu, tpr, max_irr); } static void inject_pending_event(struct kvm_vcpu *vcpu) { /* try to reinject previous events if any */ if (vcpu->arch.exception.pending) { kvm_x86_ops->queue_exception(vcpu, vcpu->arch.exception.nr, vcpu->arch.exception.has_error_code, vcpu->arch.exception.error_code); return; } if (vcpu->arch.nmi_injected) { kvm_x86_ops->set_nmi(vcpu); return; } if (vcpu->arch.interrupt.pending) { kvm_x86_ops->set_irq(vcpu); return; } /* try to inject new event if pending */ if (vcpu->arch.nmi_pending) { if (kvm_x86_ops->nmi_allowed(vcpu)) { vcpu->arch.nmi_pending = false; vcpu->arch.nmi_injected = true; kvm_x86_ops->set_nmi(vcpu); } } else if (kvm_cpu_has_interrupt(vcpu)) { if (kvm_x86_ops->interrupt_allowed(vcpu)) { kvm_queue_interrupt(vcpu, kvm_cpu_get_interrupt(vcpu), false); kvm_x86_ops->set_irq(vcpu); } } } static int vcpu_enter_guest(struct kvm_vcpu *vcpu) { int r; bool req_int_win = !irqchip_in_kernel(vcpu->kvm) && vcpu->run->request_interrupt_window; if (vcpu->requests) if (test_and_clear_bit(KVM_REQ_MMU_RELOAD, &vcpu->requests)) kvm_mmu_unload(vcpu); r = kvm_mmu_reload(vcpu); if (unlikely(r)) goto out; if (vcpu->requests) { if (test_and_clear_bit(KVM_REQ_MIGRATE_TIMER, &vcpu->requests)) __kvm_migrate_timers(vcpu); if (test_and_clear_bit(KVM_REQ_KVMCLOCK_UPDATE, &vcpu->requests)) kvm_write_guest_time(vcpu); if (test_and_clear_bit(KVM_REQ_MMU_SYNC, &vcpu->requests)) kvm_mmu_sync_roots(vcpu); if (test_and_clear_bit(KVM_REQ_TLB_FLUSH, &vcpu->requests)) kvm_x86_ops->tlb_flush(vcpu); if (test_and_clear_bit(KVM_REQ_REPORT_TPR_ACCESS, &vcpu->requests)) { vcpu->run->exit_reason = KVM_EXIT_TPR_ACCESS; r = 0; goto out; } if (test_and_clear_bit(KVM_REQ_TRIPLE_FAULT, &vcpu->requests)) { vcpu->run->exit_reason = KVM_EXIT_SHUTDOWN; r = 0; goto out; } if (test_and_clear_bit(KVM_REQ_DEACTIVATE_FPU, &vcpu->requests)) { vcpu->fpu_active = 0; kvm_x86_ops->fpu_deactivate(vcpu); } } preempt_disable(); kvm_x86_ops->prepare_guest_switch(vcpu); if (vcpu->fpu_active) kvm_load_guest_fpu(vcpu); local_irq_disable(); clear_bit(KVM_REQ_KICK, &vcpu->requests); smp_mb__after_clear_bit(); if (vcpu->requests || need_resched() || signal_pending(current)) { set_bit(KVM_REQ_KICK, &vcpu->requests); local_irq_enable(); preempt_enable(); r = 1; goto out; } inject_pending_event(vcpu); /* enable NMI/IRQ window open exits if needed */ if (vcpu->arch.nmi_pending) kvm_x86_ops->enable_nmi_window(vcpu); else if (kvm_cpu_has_interrupt(vcpu) || req_int_win) kvm_x86_ops->enable_irq_window(vcpu); if (kvm_lapic_enabled(vcpu)) { update_cr8_intercept(vcpu); kvm_lapic_sync_to_vapic(vcpu); } srcu_read_unlock(&vcpu->kvm->srcu, vcpu->srcu_idx); kvm_guest_enter(); if (unlikely(vcpu->arch.switch_db_regs)) { set_debugreg(0, 7); set_debugreg(vcpu->arch.eff_db[0], 0); set_debugreg(vcpu->arch.eff_db[1], 1); set_debugreg(vcpu->arch.eff_db[2], 2); set_debugreg(vcpu->arch.eff_db[3], 3); } trace_kvm_entry(vcpu->vcpu_id); kvm_x86_ops->run(vcpu); /* * If the guest has used debug registers, at least dr7 * will be disabled while returning to the host. * If we don't have active breakpoints in the host, we don't * care about the messed up debug address registers. But if * we have some of them active, restore the old state. */ if (hw_breakpoint_active()) hw_breakpoint_restore(); set_bit(KVM_REQ_KICK, &vcpu->requests); local_irq_enable(); ++vcpu->stat.exits; /* * We must have an instruction between local_irq_enable() and * kvm_guest_exit(), so the timer interrupt isn't delayed by * the interrupt shadow. The stat.exits increment will do nicely. * But we need to prevent reordering, hence this barrier(): */ barrier(); kvm_guest_exit(); preempt_enable(); vcpu->srcu_idx = srcu_read_lock(&vcpu->kvm->srcu); /* * Profile KVM exit RIPs: */ if (unlikely(prof_on == KVM_PROFILING)) { unsigned long rip = kvm_rip_read(vcpu); profile_hit(KVM_PROFILING, (void *)rip); } kvm_lapic_sync_from_vapic(vcpu); r = kvm_x86_ops->handle_exit(vcpu); out: return r; } static int __vcpu_run(struct kvm_vcpu *vcpu) { int r; struct kvm *kvm = vcpu->kvm; if (unlikely(vcpu->arch.mp_state == KVM_MP_STATE_SIPI_RECEIVED)) { pr_debug("vcpu %d received sipi with vector # %x\n", vcpu->vcpu_id, vcpu->arch.sipi_vector); kvm_lapic_reset(vcpu); r = kvm_arch_vcpu_reset(vcpu); if (r) return r; vcpu->arch.mp_state = KVM_MP_STATE_RUNNABLE; } vcpu->srcu_idx = srcu_read_lock(&kvm->srcu); vapic_enter(vcpu); r = 1; while (r > 0) { if (vcpu->arch.mp_state == KVM_MP_STATE_RUNNABLE) r = vcpu_enter_guest(vcpu); else { srcu_read_unlock(&kvm->srcu, vcpu->srcu_idx); kvm_vcpu_block(vcpu); vcpu->srcu_idx = srcu_read_lock(&kvm->srcu); if (test_and_clear_bit(KVM_REQ_UNHALT, &vcpu->requests)) { switch(vcpu->arch.mp_state) { case KVM_MP_STATE_HALTED: vcpu->arch.mp_state = KVM_MP_STATE_RUNNABLE; case KVM_MP_STATE_RUNNABLE: break; case KVM_MP_STATE_SIPI_RECEIVED: default: r = -EINTR; break; } } } if (r <= 0) break; clear_bit(KVM_REQ_PENDING_TIMER, &vcpu->requests); if (kvm_cpu_has_pending_timer(vcpu)) kvm_inject_pending_timer_irqs(vcpu); if (dm_request_for_irq_injection(vcpu)) { r = -EINTR; vcpu->run->exit_reason = KVM_EXIT_INTR; ++vcpu->stat.request_irq_exits; } if (signal_pending(current)) { r = -EINTR; vcpu->run->exit_reason = KVM_EXIT_INTR; ++vcpu->stat.signal_exits; } if (need_resched()) { srcu_read_unlock(&kvm->srcu, vcpu->srcu_idx); kvm_resched(vcpu); vcpu->srcu_idx = srcu_read_lock(&kvm->srcu); } } srcu_read_unlock(&kvm->srcu, vcpu->srcu_idx); post_kvm_run_save(vcpu); vapic_exit(vcpu); return r; } int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run) { int r; sigset_t sigsaved; vcpu_load(vcpu); if (vcpu->sigset_active) sigprocmask(SIG_SETMASK, &vcpu->sigset, &sigsaved); if (unlikely(vcpu->arch.mp_state == KVM_MP_STATE_UNINITIALIZED)) { kvm_vcpu_block(vcpu); clear_bit(KVM_REQ_UNHALT, &vcpu->requests); r = -EAGAIN; goto out; } /* re-sync apic's tpr */ if (!irqchip_in_kernel(vcpu->kvm)) kvm_set_cr8(vcpu, kvm_run->cr8); if (vcpu->arch.pio.cur_count) { vcpu->srcu_idx = srcu_read_lock(&vcpu->kvm->srcu); r = complete_pio(vcpu); srcu_read_unlock(&vcpu->kvm->srcu, vcpu->srcu_idx); if (r) goto out; } if (vcpu->mmio_needed) { memcpy(vcpu->mmio_data, kvm_run->mmio.data, 8); vcpu->mmio_read_completed = 1; vcpu->mmio_needed = 0; vcpu->srcu_idx = srcu_read_lock(&vcpu->kvm->srcu); r = emulate_instruction(vcpu, vcpu->arch.mmio_fault_cr2, 0, EMULTYPE_NO_DECODE); srcu_read_unlock(&vcpu->kvm->srcu, vcpu->srcu_idx); if (r == EMULATE_DO_MMIO) { /* * Read-modify-write. Back to userspace. */ r = 0; goto out; } } if (kvm_run->exit_reason == KVM_EXIT_HYPERCALL) kvm_register_write(vcpu, VCPU_REGS_RAX, kvm_run->hypercall.ret); r = __vcpu_run(vcpu); out: if (vcpu->sigset_active) sigprocmask(SIG_SETMASK, &sigsaved, NULL); vcpu_put(vcpu); return r; } int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs) { vcpu_load(vcpu); regs->rax = kvm_register_read(vcpu, VCPU_REGS_RAX); regs->rbx = kvm_register_read(vcpu, VCPU_REGS_RBX); regs->rcx = kvm_register_read(vcpu, VCPU_REGS_RCX); regs->rdx = kvm_register_read(vcpu, VCPU_REGS_RDX); regs->rsi = kvm_register_read(vcpu, VCPU_REGS_RSI); regs->rdi = kvm_register_read(vcpu, VCPU_REGS_RDI); regs->rsp = kvm_register_read(vcpu, VCPU_REGS_RSP); regs->rbp = kvm_register_read(vcpu, VCPU_REGS_RBP); #ifdef CONFIG_X86_64 regs->r8 = kvm_register_read(vcpu, VCPU_REGS_R8); regs->r9 = kvm_register_read(vcpu, VCPU_REGS_R9); regs->r10 = kvm_register_read(vcpu, VCPU_REGS_R10); regs->r11 = kvm_register_read(vcpu, VCPU_REGS_R11); regs->r12 = kvm_register_read(vcpu, VCPU_REGS_R12); regs->r13 = kvm_register_read(vcpu, VCPU_REGS_R13); regs->r14 = kvm_register_read(vcpu, VCPU_REGS_R14); regs->r15 = kvm_register_read(vcpu, VCPU_REGS_R15); #endif regs->rip = kvm_rip_read(vcpu); regs->rflags = kvm_get_rflags(vcpu); vcpu_put(vcpu); return 0; } int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs) { vcpu_load(vcpu); kvm_register_write(vcpu, VCPU_REGS_RAX, regs->rax); kvm_register_write(vcpu, VCPU_REGS_RBX, regs->rbx); kvm_register_write(vcpu, VCPU_REGS_RCX, regs->rcx); kvm_register_write(vcpu, VCPU_REGS_RDX, regs->rdx); kvm_register_write(vcpu, VCPU_REGS_RSI, regs->rsi); kvm_register_write(vcpu, VCPU_REGS_RDI, regs->rdi); kvm_register_write(vcpu, VCPU_REGS_RSP, regs->rsp); kvm_register_write(vcpu, VCPU_REGS_RBP, regs->rbp); #ifdef CONFIG_X86_64 kvm_register_write(vcpu, VCPU_REGS_R8, regs->r8); kvm_register_write(vcpu, VCPU_REGS_R9, regs->r9); kvm_register_write(vcpu, VCPU_REGS_R10, regs->r10); kvm_register_write(vcpu, VCPU_REGS_R11, regs->r11); kvm_register_write(vcpu, VCPU_REGS_R12, regs->r12); kvm_register_write(vcpu, VCPU_REGS_R13, regs->r13); kvm_register_write(vcpu, VCPU_REGS_R14, regs->r14); kvm_register_write(vcpu, VCPU_REGS_R15, regs->r15); #endif kvm_rip_write(vcpu, regs->rip); kvm_set_rflags(vcpu, regs->rflags); vcpu->arch.exception.pending = false; vcpu_put(vcpu); return 0; } void kvm_get_segment(struct kvm_vcpu *vcpu, struct kvm_segment *var, int seg) { kvm_x86_ops->get_segment(vcpu, var, seg); } void kvm_get_cs_db_l_bits(struct kvm_vcpu *vcpu, int *db, int *l) { struct kvm_segment cs; kvm_get_segment(vcpu, &cs, VCPU_SREG_CS); *db = cs.db; *l = cs.l; } EXPORT_SYMBOL_GPL(kvm_get_cs_db_l_bits); int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu, struct kvm_sregs *sregs) { struct desc_ptr dt; vcpu_load(vcpu); kvm_get_segment(vcpu, &sregs->cs, VCPU_SREG_CS); kvm_get_segment(vcpu, &sregs->ds, VCPU_SREG_DS); kvm_get_segment(vcpu, &sregs->es, VCPU_SREG_ES); kvm_get_segment(vcpu, &sregs->fs, VCPU_SREG_FS); kvm_get_segment(vcpu, &sregs->gs, VCPU_SREG_GS); kvm_get_segment(vcpu, &sregs->ss, VCPU_SREG_SS); kvm_get_segment(vcpu, &sregs->tr, VCPU_SREG_TR); kvm_get_segment(vcpu, &sregs->ldt, VCPU_SREG_LDTR); kvm_x86_ops->get_idt(vcpu, &dt); sregs->idt.limit = dt.size; sregs->idt.base = dt.address; kvm_x86_ops->get_gdt(vcpu, &dt); sregs->gdt.limit = dt.size; sregs->gdt.base = dt.address; sregs->cr0 = kvm_read_cr0(vcpu); sregs->cr2 = vcpu->arch.cr2; sregs->cr3 = vcpu->arch.cr3; sregs->cr4 = kvm_read_cr4(vcpu); sregs->cr8 = kvm_get_cr8(vcpu); sregs->efer = vcpu->arch.efer; sregs->apic_base = kvm_get_apic_base(vcpu); memset(sregs->interrupt_bitmap, 0, sizeof sregs->interrupt_bitmap); if (vcpu->arch.interrupt.pending && !vcpu->arch.interrupt.soft) set_bit(vcpu->arch.interrupt.nr, (unsigned long *)sregs->interrupt_bitmap); vcpu_put(vcpu); return 0; } int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu, struct kvm_mp_state *mp_state) { vcpu_load(vcpu); mp_state->mp_state = vcpu->arch.mp_state; vcpu_put(vcpu); return 0; } int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu, struct kvm_mp_state *mp_state) { vcpu_load(vcpu); vcpu->arch.mp_state = mp_state->mp_state; vcpu_put(vcpu); return 0; } static void kvm_set_segment(struct kvm_vcpu *vcpu, struct kvm_segment *var, int seg) { kvm_x86_ops->set_segment(vcpu, var, seg); } static void seg_desct_to_kvm_desct(struct desc_struct *seg_desc, u16 selector, struct kvm_segment *kvm_desct) { kvm_desct->base = get_desc_base(seg_desc); kvm_desct->limit = get_desc_limit(seg_desc); if (seg_desc->g) { kvm_desct->limit <<= 12; kvm_desct->limit |= 0xfff; } kvm_desct->selector = selector; kvm_desct->type = seg_desc->type; kvm_desct->present = seg_desc->p; kvm_desct->dpl = seg_desc->dpl; kvm_desct->db = seg_desc->d; kvm_desct->s = seg_desc->s; kvm_desct->l = seg_desc->l; kvm_desct->g = seg_desc->g; kvm_desct->avl = seg_desc->avl; if (!selector) kvm_desct->unusable = 1; else kvm_desct->unusable = 0; kvm_desct->padding = 0; } static void get_segment_descriptor_dtable(struct kvm_vcpu *vcpu, u16 selector, struct desc_ptr *dtable) { if (selector & 1 << 2) { struct kvm_segment kvm_seg; kvm_get_segment(vcpu, &kvm_seg, VCPU_SREG_LDTR); if (kvm_seg.unusable) dtable->size = 0; else dtable->size = kvm_seg.limit; dtable->address = kvm_seg.base; } else kvm_x86_ops->get_gdt(vcpu, dtable); } /* allowed just for 8 bytes segments */ static int load_guest_segment_descriptor(struct kvm_vcpu *vcpu, u16 selector, struct desc_struct *seg_desc) { struct desc_ptr dtable; u16 index = selector >> 3; int ret; u32 err; gva_t addr; get_segment_descriptor_dtable(vcpu, selector, &dtable); if (dtable.size < index * 8 + 7) { kvm_queue_exception_e(vcpu, GP_VECTOR, selector & 0xfffc); return X86EMUL_PROPAGATE_FAULT; } addr = dtable.base + index * 8; ret = kvm_read_guest_virt_system(addr, seg_desc, sizeof(*seg_desc), vcpu, &err); if (ret == X86EMUL_PROPAGATE_FAULT) kvm_inject_page_fault(vcpu, addr, err); return ret; } /* allowed just for 8 bytes segments */ static int save_guest_segment_descriptor(struct kvm_vcpu *vcpu, u16 selector, struct desc_struct *seg_desc) { struct desc_ptr dtable; u16 index = selector >> 3; get_segment_descriptor_dtable(vcpu, selector, &dtable); if (dtable.size < index * 8 + 7) return 1; return kvm_write_guest_virt(dtable.address + index*8, seg_desc, sizeof(*seg_desc), vcpu, NULL); } static gpa_t get_tss_base_addr_write(struct kvm_vcpu *vcpu, struct desc_struct *seg_desc) { u32 base_addr = get_desc_base(seg_desc); return kvm_mmu_gva_to_gpa_write(vcpu, base_addr, NULL); } static gpa_t get_tss_base_addr_read(struct kvm_vcpu *vcpu, struct desc_struct *seg_desc) { u32 base_addr = get_desc_base(seg_desc); return kvm_mmu_gva_to_gpa_read(vcpu, base_addr, NULL); } static u16 get_segment_selector(struct kvm_vcpu *vcpu, int seg) { struct kvm_segment kvm_seg; kvm_get_segment(vcpu, &kvm_seg, seg); return kvm_seg.selector; } static int kvm_load_realmode_segment(struct kvm_vcpu *vcpu, u16 selector, int seg) { struct kvm_segment segvar = { .base = selector << 4, .limit = 0xffff, .selector = selector, .type = 3, .present = 1, .dpl = 3, .db = 0, .s = 1, .l = 0, .g = 0, .avl = 0, .unusable = 0, }; kvm_x86_ops->set_segment(vcpu, &segvar, seg); return X86EMUL_CONTINUE; } static int is_vm86_segment(struct kvm_vcpu *vcpu, int seg) { return (seg != VCPU_SREG_LDTR) && (seg != VCPU_SREG_TR) && (kvm_get_rflags(vcpu) & X86_EFLAGS_VM); } int kvm_load_segment_descriptor(struct kvm_vcpu *vcpu, u16 selector, int seg) { struct kvm_segment kvm_seg; struct desc_struct seg_desc; u8 dpl, rpl, cpl; unsigned err_vec = GP_VECTOR; u32 err_code = 0; bool null_selector = !(selector & ~0x3); /* 0000-0003 are null */ int ret; if (is_vm86_segment(vcpu, seg) || !is_protmode(vcpu)) return kvm_load_realmode_segment(vcpu, selector, seg); /* NULL selector is not valid for TR, CS and SS */ if ((seg == VCPU_SREG_CS || seg == VCPU_SREG_SS || seg == VCPU_SREG_TR) && null_selector) goto exception; /* TR should be in GDT only */ if (seg == VCPU_SREG_TR && (selector & (1 << 2))) goto exception; ret = load_guest_segment_descriptor(vcpu, selector, &seg_desc); if (ret) return ret; seg_desct_to_kvm_desct(&seg_desc, selector, &kvm_seg); if (null_selector) { /* for NULL selector skip all following checks */ kvm_seg.unusable = 1; goto load; } err_code = selector & 0xfffc; err_vec = GP_VECTOR; /* can't load system descriptor into segment selecor */ if (seg <= VCPU_SREG_GS && !kvm_seg.s) goto exception; if (!kvm_seg.present) { err_vec = (seg == VCPU_SREG_SS) ? SS_VECTOR : NP_VECTOR; goto exception; } rpl = selector & 3; dpl = kvm_seg.dpl; cpl = kvm_x86_ops->get_cpl(vcpu); switch (seg) { case VCPU_SREG_SS: /* * segment is not a writable data segment or segment * selector's RPL != CPL or segment selector's RPL != CPL */ if (rpl != cpl || (kvm_seg.type & 0xa) != 0x2 || dpl != cpl) goto exception; break; case VCPU_SREG_CS: if (!(kvm_seg.type & 8)) goto exception; if (kvm_seg.type & 4) { /* conforming */ if (dpl > cpl) goto exception; } else { /* nonconforming */ if (rpl > cpl || dpl != cpl) goto exception; } /* CS(RPL) <- CPL */ selector = (selector & 0xfffc) | cpl; break; case VCPU_SREG_TR: if (kvm_seg.s || (kvm_seg.type != 1 && kvm_seg.type != 9)) goto exception; break; case VCPU_SREG_LDTR: if (kvm_seg.s || kvm_seg.type != 2) goto exception; break; default: /* DS, ES, FS, or GS */ /* * segment is not a data or readable code segment or * ((segment is a data or nonconforming code segment) * and (both RPL and CPL > DPL)) */ if ((kvm_seg.type & 0xa) == 0x8 || (((kvm_seg.type & 0xc) != 0xc) && (rpl > dpl && cpl > dpl))) goto exception; break; } if (!kvm_seg.unusable && kvm_seg.s) { /* mark segment as accessed */ kvm_seg.type |= 1; seg_desc.type |= 1; save_guest_segment_descriptor(vcpu, selector, &seg_desc); } load: kvm_set_segment(vcpu, &kvm_seg, seg); return X86EMUL_CONTINUE; exception: kvm_queue_exception_e(vcpu, err_vec, err_code); return X86EMUL_PROPAGATE_FAULT; } static void save_state_to_tss32(struct kvm_vcpu *vcpu, struct tss_segment_32 *tss) { tss->cr3 = vcpu->arch.cr3; tss->eip = kvm_rip_read(vcpu); tss->eflags = kvm_get_rflags(vcpu); tss->eax = kvm_register_read(vcpu, VCPU_REGS_RAX); tss->ecx = kvm_register_read(vcpu, VCPU_REGS_RCX); tss->edx = kvm_register_read(vcpu, VCPU_REGS_RDX); tss->ebx = kvm_register_read(vcpu, VCPU_REGS_RBX); tss->esp = kvm_register_read(vcpu, VCPU_REGS_RSP); tss->ebp = kvm_register_read(vcpu, VCPU_REGS_RBP); tss->esi = kvm_register_read(vcpu, VCPU_REGS_RSI); tss->edi = kvm_register_read(vcpu, VCPU_REGS_RDI); tss->es = get_segment_selector(vcpu, VCPU_SREG_ES); tss->cs = get_segment_selector(vcpu, VCPU_SREG_CS); tss->ss = get_segment_selector(vcpu, VCPU_SREG_SS); tss->ds = get_segment_selector(vcpu, VCPU_SREG_DS); tss->fs = get_segment_selector(vcpu, VCPU_SREG_FS); tss->gs = get_segment_selector(vcpu, VCPU_SREG_GS); tss->ldt_selector = get_segment_selector(vcpu, VCPU_SREG_LDTR); } static void kvm_load_segment_selector(struct kvm_vcpu *vcpu, u16 sel, int seg) { struct kvm_segment kvm_seg; kvm_get_segment(vcpu, &kvm_seg, seg); kvm_seg.selector = sel; kvm_set_segment(vcpu, &kvm_seg, seg); } static int load_state_from_tss32(struct kvm_vcpu *vcpu, struct tss_segment_32 *tss) { kvm_set_cr3(vcpu, tss->cr3); kvm_rip_write(vcpu, tss->eip); kvm_set_rflags(vcpu, tss->eflags | 2); kvm_register_write(vcpu, VCPU_REGS_RAX, tss->eax); kvm_register_write(vcpu, VCPU_REGS_RCX, tss->ecx); kvm_register_write(vcpu, VCPU_REGS_RDX, tss->edx); kvm_register_write(vcpu, VCPU_REGS_RBX, tss->ebx); kvm_register_write(vcpu, VCPU_REGS_RSP, tss->esp); kvm_register_write(vcpu, VCPU_REGS_RBP, tss->ebp); kvm_register_write(vcpu, VCPU_REGS_RSI, tss->esi); kvm_register_write(vcpu, VCPU_REGS_RDI, tss->edi); /* * SDM says that segment selectors are loaded before segment * descriptors */ kvm_load_segment_selector(vcpu, tss->ldt_selector, VCPU_SREG_LDTR); kvm_load_segment_selector(vcpu, tss->es, VCPU_SREG_ES); kvm_load_segment_selector(vcpu, tss->cs, VCPU_SREG_CS); kvm_load_segment_selector(vcpu, tss->ss, VCPU_SREG_SS); kvm_load_segment_selector(vcpu, tss->ds, VCPU_SREG_DS); kvm_load_segment_selector(vcpu, tss->fs, VCPU_SREG_FS); kvm_load_segment_selector(vcpu, tss->gs, VCPU_SREG_GS); /* * Now load segment descriptors. If fault happenes at this stage * it is handled in a context of new task */ if (kvm_load_segment_descriptor(vcpu, tss->ldt_selector, VCPU_SREG_LDTR)) return 1; if (kvm_load_segment_descriptor(vcpu, tss->es, VCPU_SREG_ES)) return 1; if (kvm_load_segment_descriptor(vcpu, tss->cs, VCPU_SREG_CS)) return 1; if (kvm_load_segment_descriptor(vcpu, tss->ss, VCPU_SREG_SS)) return 1; if (kvm_load_segment_descriptor(vcpu, tss->ds, VCPU_SREG_DS)) return 1; if (kvm_load_segment_descriptor(vcpu, tss->fs, VCPU_SREG_FS)) return 1; if (kvm_load_segment_descriptor(vcpu, tss->gs, VCPU_SREG_GS)) return 1; return 0; } static void save_state_to_tss16(struct kvm_vcpu *vcpu, struct tss_segment_16 *tss) { tss->ip = kvm_rip_read(vcpu); tss->flag = kvm_get_rflags(vcpu); tss->ax = kvm_register_read(vcpu, VCPU_REGS_RAX); tss->cx = kvm_register_read(vcpu, VCPU_REGS_RCX); tss->dx = kvm_register_read(vcpu, VCPU_REGS_RDX); tss->bx = kvm_register_read(vcpu, VCPU_REGS_RBX); tss->sp = kvm_register_read(vcpu, VCPU_REGS_RSP); tss->bp = kvm_register_read(vcpu, VCPU_REGS_RBP); tss->si = kvm_register_read(vcpu, VCPU_REGS_RSI); tss->di = kvm_register_read(vcpu, VCPU_REGS_RDI); tss->es = get_segment_selector(vcpu, VCPU_SREG_ES); tss->cs = get_segment_selector(vcpu, VCPU_SREG_CS); tss->ss = get_segment_selector(vcpu, VCPU_SREG_SS); tss->ds = get_segment_selector(vcpu, VCPU_SREG_DS); tss->ldt = get_segment_selector(vcpu, VCPU_SREG_LDTR); } static int load_state_from_tss16(struct kvm_vcpu *vcpu, struct tss_segment_16 *tss) { kvm_rip_write(vcpu, tss->ip); kvm_set_rflags(vcpu, tss->flag | 2); kvm_register_write(vcpu, VCPU_REGS_RAX, tss->ax); kvm_register_write(vcpu, VCPU_REGS_RCX, tss->cx); kvm_register_write(vcpu, VCPU_REGS_RDX, tss->dx); kvm_register_write(vcpu, VCPU_REGS_RBX, tss->bx); kvm_register_write(vcpu, VCPU_REGS_RSP, tss->sp); kvm_register_write(vcpu, VCPU_REGS_RBP, tss->bp); kvm_register_write(vcpu, VCPU_REGS_RSI, tss->si); kvm_register_write(vcpu, VCPU_REGS_RDI, tss->di); /* * SDM says that segment selectors are loaded before segment * descriptors */ kvm_load_segment_selector(vcpu, tss->ldt, VCPU_SREG_LDTR); kvm_load_segment_selector(vcpu, tss->es, VCPU_SREG_ES); kvm_load_segment_selector(vcpu, tss->cs, VCPU_SREG_CS); kvm_load_segment_selector(vcpu, tss->ss, VCPU_SREG_SS); kvm_load_segment_selector(vcpu, tss->ds, VCPU_SREG_DS); /* * Now load segment descriptors. If fault happenes at this stage * it is handled in a context of new task */ if (kvm_load_segment_descriptor(vcpu, tss->ldt, VCPU_SREG_LDTR)) return 1; if (kvm_load_segment_descriptor(vcpu, tss->es, VCPU_SREG_ES)) return 1; if (kvm_load_segment_descriptor(vcpu, tss->cs, VCPU_SREG_CS)) return 1; if (kvm_load_segment_descriptor(vcpu, tss->ss, VCPU_SREG_SS)) return 1; if (kvm_load_segment_descriptor(vcpu, tss->ds, VCPU_SREG_DS)) return 1; return 0; } static int kvm_task_switch_16(struct kvm_vcpu *vcpu, u16 tss_selector, u16 old_tss_sel, u32 old_tss_base, struct desc_struct *nseg_desc) { struct tss_segment_16 tss_segment_16; int ret = 0; if (kvm_read_guest(vcpu->kvm, old_tss_base, &tss_segment_16, sizeof tss_segment_16)) goto out; save_state_to_tss16(vcpu, &tss_segment_16); if (kvm_write_guest(vcpu->kvm, old_tss_base, &tss_segment_16, sizeof tss_segment_16)) goto out; if (kvm_read_guest(vcpu->kvm, get_tss_base_addr_read(vcpu, nseg_desc), &tss_segment_16, sizeof tss_segment_16)) goto out; if (old_tss_sel != 0xffff) { tss_segment_16.prev_task_link = old_tss_sel; if (kvm_write_guest(vcpu->kvm, get_tss_base_addr_write(vcpu, nseg_desc), &tss_segment_16.prev_task_link, sizeof tss_segment_16.prev_task_link)) goto out; } if (load_state_from_tss16(vcpu, &tss_segment_16)) goto out; ret = 1; out: return ret; } static int kvm_task_switch_32(struct kvm_vcpu *vcpu, u16 tss_selector, u16 old_tss_sel, u32 old_tss_base, struct desc_struct *nseg_desc) { struct tss_segment_32 tss_segment_32; int ret = 0; if (kvm_read_guest(vcpu->kvm, old_tss_base, &tss_segment_32, sizeof tss_segment_32)) goto out; save_state_to_tss32(vcpu, &tss_segment_32); if (kvm_write_guest(vcpu->kvm, old_tss_base, &tss_segment_32, sizeof tss_segment_32)) goto out; if (kvm_read_guest(vcpu->kvm, get_tss_base_addr_read(vcpu, nseg_desc), &tss_segment_32, sizeof tss_segment_32)) goto out; if (old_tss_sel != 0xffff) { tss_segment_32.prev_task_link = old_tss_sel; if (kvm_write_guest(vcpu->kvm, get_tss_base_addr_write(vcpu, nseg_desc), &tss_segment_32.prev_task_link, sizeof tss_segment_32.prev_task_link)) goto out; } if (load_state_from_tss32(vcpu, &tss_segment_32)) goto out; ret = 1; out: return ret; } int kvm_task_switch(struct kvm_vcpu *vcpu, u16 tss_selector, int reason) { struct kvm_segment tr_seg; struct desc_struct cseg_desc; struct desc_struct nseg_desc; int ret = 0; u32 old_tss_base = get_segment_base(vcpu, VCPU_SREG_TR); u16 old_tss_sel = get_segment_selector(vcpu, VCPU_SREG_TR); u32 desc_limit; old_tss_base = kvm_mmu_gva_to_gpa_write(vcpu, old_tss_base, NULL); /* FIXME: Handle errors. Failure to read either TSS or their * descriptors should generate a pagefault. */ if (load_guest_segment_descriptor(vcpu, tss_selector, &nseg_desc)) goto out; if (load_guest_segment_descriptor(vcpu, old_tss_sel, &cseg_desc)) goto out; if (reason != TASK_SWITCH_IRET) { int cpl; cpl = kvm_x86_ops->get_cpl(vcpu); if ((tss_selector & 3) > nseg_desc.dpl || cpl > nseg_desc.dpl) { kvm_queue_exception_e(vcpu, GP_VECTOR, 0); return 1; } } desc_limit = get_desc_limit(&nseg_desc); if (!nseg_desc.p || ((desc_limit < 0x67 && (nseg_desc.type & 8)) || desc_limit < 0x2b)) { kvm_queue_exception_e(vcpu, TS_VECTOR, tss_selector & 0xfffc); return 1; } if (reason == TASK_SWITCH_IRET || reason == TASK_SWITCH_JMP) { cseg_desc.type &= ~(1 << 1); //clear the B flag save_guest_segment_descriptor(vcpu, old_tss_sel, &cseg_desc); } if (reason == TASK_SWITCH_IRET) { u32 eflags = kvm_get_rflags(vcpu); kvm_set_rflags(vcpu, eflags & ~X86_EFLAGS_NT); } /* set back link to prev task only if NT bit is set in eflags note that old_tss_sel is not used afetr this point */ if (reason != TASK_SWITCH_CALL && reason != TASK_SWITCH_GATE) old_tss_sel = 0xffff; if (nseg_desc.type & 8) ret = kvm_task_switch_32(vcpu, tss_selector, old_tss_sel, old_tss_base, &nseg_desc); else ret = kvm_task_switch_16(vcpu, tss_selector, old_tss_sel, old_tss_base, &nseg_desc); if (reason == TASK_SWITCH_CALL || reason == TASK_SWITCH_GATE) { u32 eflags = kvm_get_rflags(vcpu); kvm_set_rflags(vcpu, eflags | X86_EFLAGS_NT); } if (reason != TASK_SWITCH_IRET) { nseg_desc.type |= (1 << 1); save_guest_segment_descriptor(vcpu, tss_selector, &nseg_desc); } kvm_x86_ops->set_cr0(vcpu, kvm_read_cr0(vcpu) | X86_CR0_TS); seg_desct_to_kvm_desct(&nseg_desc, tss_selector, &tr_seg); tr_seg.type = 11; kvm_set_segment(vcpu, &tr_seg, VCPU_SREG_TR); out: return ret; } EXPORT_SYMBOL_GPL(kvm_task_switch); int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu, struct kvm_sregs *sregs) { int mmu_reset_needed = 0; int pending_vec, max_bits; struct desc_ptr dt; vcpu_load(vcpu); dt.size = sregs->idt.limit; dt.address = sregs->idt.base; kvm_x86_ops->set_idt(vcpu, &dt); dt.size = sregs->gdt.limit; dt.address = sregs->gdt.base; kvm_x86_ops->set_gdt(vcpu, &dt); vcpu->arch.cr2 = sregs->cr2; mmu_reset_needed |= vcpu->arch.cr3 != sregs->cr3; vcpu->arch.cr3 = sregs->cr3; kvm_set_cr8(vcpu, sregs->cr8); mmu_reset_needed |= vcpu->arch.efer != sregs->efer; kvm_x86_ops->set_efer(vcpu, sregs->efer); kvm_set_apic_base(vcpu, sregs->apic_base); mmu_reset_needed |= kvm_read_cr0(vcpu) != sregs->cr0; kvm_x86_ops->set_cr0(vcpu, sregs->cr0); vcpu->arch.cr0 = sregs->cr0; mmu_reset_needed |= kvm_read_cr4(vcpu) != sregs->cr4; kvm_x86_ops->set_cr4(vcpu, sregs->cr4); if (!is_long_mode(vcpu) && is_pae(vcpu)) { load_pdptrs(vcpu, vcpu->arch.cr3); mmu_reset_needed = 1; } if (mmu_reset_needed) kvm_mmu_reset_context(vcpu); max_bits = (sizeof sregs->interrupt_bitmap) << 3; pending_vec = find_first_bit( (const unsigned long *)sregs->interrupt_bitmap, max_bits); if (pending_vec < max_bits) { kvm_queue_interrupt(vcpu, pending_vec, false); pr_debug("Set back pending irq %d\n", pending_vec); if (irqchip_in_kernel(vcpu->kvm)) kvm_pic_clear_isr_ack(vcpu->kvm); } kvm_set_segment(vcpu, &sregs->cs, VCPU_SREG_CS); kvm_set_segment(vcpu, &sregs->ds, VCPU_SREG_DS); kvm_set_segment(vcpu, &sregs->es, VCPU_SREG_ES); kvm_set_segment(vcpu, &sregs->fs, VCPU_SREG_FS); kvm_set_segment(vcpu, &sregs->gs, VCPU_SREG_GS); kvm_set_segment(vcpu, &sregs->ss, VCPU_SREG_SS); kvm_set_segment(vcpu, &sregs->tr, VCPU_SREG_TR); kvm_set_segment(vcpu, &sregs->ldt, VCPU_SREG_LDTR); update_cr8_intercept(vcpu); /* Older userspace won't unhalt the vcpu on reset. */ if (kvm_vcpu_is_bsp(vcpu) && kvm_rip_read(vcpu) == 0xfff0 && sregs->cs.selector == 0xf000 && sregs->cs.base == 0xffff0000 && !is_protmode(vcpu)) vcpu->arch.mp_state = KVM_MP_STATE_RUNNABLE; vcpu_put(vcpu); return 0; } int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu, struct kvm_guest_debug *dbg) { unsigned long rflags; int i, r; vcpu_load(vcpu); if (dbg->control & (KVM_GUESTDBG_INJECT_DB | KVM_GUESTDBG_INJECT_BP)) { r = -EBUSY; if (vcpu->arch.exception.pending) goto unlock_out; if (dbg->control & KVM_GUESTDBG_INJECT_DB) kvm_queue_exception(vcpu, DB_VECTOR); else kvm_queue_exception(vcpu, BP_VECTOR); } /* * Read rflags as long as potentially injected trace flags are still * filtered out. */ rflags = kvm_get_rflags(vcpu); vcpu->guest_debug = dbg->control; if (!(vcpu->guest_debug & KVM_GUESTDBG_ENABLE)) vcpu->guest_debug = 0; if (vcpu->guest_debug & KVM_GUESTDBG_USE_HW_BP) { for (i = 0; i < KVM_NR_DB_REGS; ++i) vcpu->arch.eff_db[i] = dbg->arch.debugreg[i]; vcpu->arch.switch_db_regs = (dbg->arch.debugreg[7] & DR7_BP_EN_MASK); } else { for (i = 0; i < KVM_NR_DB_REGS; i++) vcpu->arch.eff_db[i] = vcpu->arch.db[i]; vcpu->arch.switch_db_regs = (vcpu->arch.dr7 & DR7_BP_EN_MASK); } if (vcpu->guest_debug & KVM_GUESTDBG_SINGLESTEP) { vcpu->arch.singlestep_cs = get_segment_selector(vcpu, VCPU_SREG_CS); vcpu->arch.singlestep_rip = kvm_rip_read(vcpu); } /* * Trigger an rflags update that will inject or remove the trace * flags. */ kvm_set_rflags(vcpu, rflags); kvm_x86_ops->set_guest_debug(vcpu, dbg); r = 0; unlock_out: vcpu_put(vcpu); return r; } /* * fxsave fpu state. Taken from x86_64/processor.h. To be killed when * we have asm/x86/processor.h */ struct fxsave { u16 cwd; u16 swd; u16 twd; u16 fop; u64 rip; u64 rdp; u32 mxcsr; u32 mxcsr_mask; u32 st_space[32]; /* 8*16 bytes for each FP-reg = 128 bytes */ #ifdef CONFIG_X86_64 u32 xmm_space[64]; /* 16*16 bytes for each XMM-reg = 256 bytes */ #else u32 xmm_space[32]; /* 8*16 bytes for each XMM-reg = 128 bytes */ #endif }; /* * Translate a guest virtual address to a guest physical address. */ int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu, struct kvm_translation *tr) { unsigned long vaddr = tr->linear_address; gpa_t gpa; int idx; vcpu_load(vcpu); idx = srcu_read_lock(&vcpu->kvm->srcu); gpa = kvm_mmu_gva_to_gpa_system(vcpu, vaddr, NULL); srcu_read_unlock(&vcpu->kvm->srcu, idx); tr->physical_address = gpa; tr->valid = gpa != UNMAPPED_GVA; tr->writeable = 1; tr->usermode = 0; vcpu_put(vcpu); return 0; } int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu) { struct fxsave *fxsave = (struct fxsave *)&vcpu->arch.guest_fx_image; vcpu_load(vcpu); memcpy(fpu->fpr, fxsave->st_space, 128); fpu->fcw = fxsave->cwd; fpu->fsw = fxsave->swd; fpu->ftwx = fxsave->twd; fpu->last_opcode = fxsave->fop; fpu->last_ip = fxsave->rip; fpu->last_dp = fxsave->rdp; memcpy(fpu->xmm, fxsave->xmm_space, sizeof fxsave->xmm_space); vcpu_put(vcpu); return 0; } int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu) { struct fxsave *fxsave = (struct fxsave *)&vcpu->arch.guest_fx_image; vcpu_load(vcpu); memcpy(fxsave->st_space, fpu->fpr, 128); fxsave->cwd = fpu->fcw; fxsave->swd = fpu->fsw; fxsave->twd = fpu->ftwx; fxsave->fop = fpu->last_opcode; fxsave->rip = fpu->last_ip; fxsave->rdp = fpu->last_dp; memcpy(fxsave->xmm_space, fpu->xmm, sizeof fxsave->xmm_space); vcpu_put(vcpu); return 0; } void fx_init(struct kvm_vcpu *vcpu) { unsigned after_mxcsr_mask; /* * Touch the fpu the first time in non atomic context as if * this is the first fpu instruction the exception handler * will fire before the instruction returns and it'll have to * allocate ram with GFP_KERNEL. */ if (!used_math()) kvm_fx_save(&vcpu->arch.host_fx_image); /* Initialize guest FPU by resetting ours and saving into guest's */ preempt_disable(); kvm_fx_save(&vcpu->arch.host_fx_image); kvm_fx_finit(); kvm_fx_save(&vcpu->arch.guest_fx_image); kvm_fx_restore(&vcpu->arch.host_fx_image); preempt_enable(); vcpu->arch.cr0 |= X86_CR0_ET; after_mxcsr_mask = offsetof(struct i387_fxsave_struct, st_space); vcpu->arch.guest_fx_image.mxcsr = 0x1f80; memset((void *)&vcpu->arch.guest_fx_image + after_mxcsr_mask, 0, sizeof(struct i387_fxsave_struct) - after_mxcsr_mask); } EXPORT_SYMBOL_GPL(fx_init); void kvm_load_guest_fpu(struct kvm_vcpu *vcpu) { if (vcpu->guest_fpu_loaded) return; vcpu->guest_fpu_loaded = 1; kvm_fx_save(&vcpu->arch.host_fx_image); kvm_fx_restore(&vcpu->arch.guest_fx_image); trace_kvm_fpu(1); } void kvm_put_guest_fpu(struct kvm_vcpu *vcpu) { if (!vcpu->guest_fpu_loaded) return; vcpu->guest_fpu_loaded = 0; kvm_fx_save(&vcpu->arch.guest_fx_image); kvm_fx_restore(&vcpu->arch.host_fx_image); ++vcpu->stat.fpu_reload; set_bit(KVM_REQ_DEACTIVATE_FPU, &vcpu->requests); trace_kvm_fpu(0); } void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu) { if (vcpu->arch.time_page) { kvm_release_page_dirty(vcpu->arch.time_page); vcpu->arch.time_page = NULL; } kvm_x86_ops->vcpu_free(vcpu); } struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, unsigned int id) { return kvm_x86_ops->vcpu_create(kvm, id); } int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu) { int r; /* We do fxsave: this must be aligned. */ BUG_ON((unsigned long)&vcpu->arch.host_fx_image & 0xF); vcpu->arch.mtrr_state.have_fixed = 1; vcpu_load(vcpu); r = kvm_arch_vcpu_reset(vcpu); if (r == 0) r = kvm_mmu_setup(vcpu); vcpu_put(vcpu); if (r < 0) goto free_vcpu; return 0; free_vcpu: kvm_x86_ops->vcpu_free(vcpu); return r; } void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu) { vcpu_load(vcpu); kvm_mmu_unload(vcpu); vcpu_put(vcpu); kvm_x86_ops->vcpu_free(vcpu); } int kvm_arch_vcpu_reset(struct kvm_vcpu *vcpu) { vcpu->arch.nmi_pending = false; vcpu->arch.nmi_injected = false; vcpu->arch.switch_db_regs = 0; memset(vcpu->arch.db, 0, sizeof(vcpu->arch.db)); vcpu->arch.dr6 = DR6_FIXED_1; vcpu->arch.dr7 = DR7_FIXED_1; return kvm_x86_ops->vcpu_reset(vcpu); } int kvm_arch_hardware_enable(void *garbage) { /* * Since this may be called from a hotplug notifcation, * we can't get the CPU frequency directly. */ if (!boot_cpu_has(X86_FEATURE_CONSTANT_TSC)) { int cpu = raw_smp_processor_id(); per_cpu(cpu_tsc_khz, cpu) = 0; } kvm_shared_msr_cpu_online(); return kvm_x86_ops->hardware_enable(garbage); } void kvm_arch_hardware_disable(void *garbage) { kvm_x86_ops->hardware_disable(garbage); drop_user_return_notifiers(garbage); } int kvm_arch_hardware_setup(void) { return kvm_x86_ops->hardware_setup(); } void kvm_arch_hardware_unsetup(void) { kvm_x86_ops->hardware_unsetup(); } void kvm_arch_check_processor_compat(void *rtn) { kvm_x86_ops->check_processor_compatibility(rtn); } int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu) { struct page *page; struct kvm *kvm; int r; BUG_ON(vcpu->kvm == NULL); kvm = vcpu->kvm; vcpu->arch.mmu.root_hpa = INVALID_PAGE; if (!irqchip_in_kernel(kvm) || kvm_vcpu_is_bsp(vcpu)) vcpu->arch.mp_state = KVM_MP_STATE_RUNNABLE; else vcpu->arch.mp_state = KVM_MP_STATE_UNINITIALIZED; page = alloc_page(GFP_KERNEL | __GFP_ZERO); if (!page) { r = -ENOMEM; goto fail; } vcpu->arch.pio_data = page_address(page); r = kvm_mmu_create(vcpu); if (r < 0) goto fail_free_pio_data; if (irqchip_in_kernel(kvm)) { r = kvm_create_lapic(vcpu); if (r < 0) goto fail_mmu_destroy; } vcpu->arch.mce_banks = kzalloc(KVM_MAX_MCE_BANKS * sizeof(u64) * 4, GFP_KERNEL); if (!vcpu->arch.mce_banks) { r = -ENOMEM; goto fail_free_lapic; } vcpu->arch.mcg_cap = KVM_MAX_MCE_BANKS; return 0; fail_free_lapic: kvm_free_lapic(vcpu); fail_mmu_destroy: kvm_mmu_destroy(vcpu); fail_free_pio_data: free_page((unsigned long)vcpu->arch.pio_data); fail: return r; } void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu) { int idx; kfree(vcpu->arch.mce_banks); kvm_free_lapic(vcpu); idx = srcu_read_lock(&vcpu->kvm->srcu); kvm_mmu_destroy(vcpu); srcu_read_unlock(&vcpu->kvm->srcu, idx); free_page((unsigned long)vcpu->arch.pio_data); } struct kvm *kvm_arch_create_vm(void) { struct kvm *kvm = kzalloc(sizeof(struct kvm), GFP_KERNEL); if (!kvm) return ERR_PTR(-ENOMEM); kvm->arch.aliases = kzalloc(sizeof(struct kvm_mem_aliases), GFP_KERNEL); if (!kvm->arch.aliases) { kfree(kvm); return ERR_PTR(-ENOMEM); } INIT_LIST_HEAD(&kvm->arch.active_mmu_pages); INIT_LIST_HEAD(&kvm->arch.assigned_dev_head); /* Reserve bit 0 of irq_sources_bitmap for userspace irq source */ set_bit(KVM_USERSPACE_IRQ_SOURCE_ID, &kvm->arch.irq_sources_bitmap); rdtscll(kvm->arch.vm_init_tsc); return kvm; } static void kvm_unload_vcpu_mmu(struct kvm_vcpu *vcpu) { vcpu_load(vcpu); kvm_mmu_unload(vcpu); vcpu_put(vcpu); } static void kvm_free_vcpus(struct kvm *kvm) { unsigned int i; struct kvm_vcpu *vcpu; /* * Unpin any mmu pages first. */ kvm_for_each_vcpu(i, vcpu, kvm) kvm_unload_vcpu_mmu(vcpu); kvm_for_each_vcpu(i, vcpu, kvm) kvm_arch_vcpu_free(vcpu); mutex_lock(&kvm->lock); for (i = 0; i < atomic_read(&kvm->online_vcpus); i++) kvm->vcpus[i] = NULL; atomic_set(&kvm->online_vcpus, 0); mutex_unlock(&kvm->lock); } void kvm_arch_sync_events(struct kvm *kvm) { kvm_free_all_assigned_devices(kvm); } void kvm_arch_destroy_vm(struct kvm *kvm) { kvm_iommu_unmap_guest(kvm); kvm_free_pit(kvm); kfree(kvm->arch.vpic); kfree(kvm->arch.vioapic); kvm_free_vcpus(kvm); kvm_free_physmem(kvm); if (kvm->arch.apic_access_page) put_page(kvm->arch.apic_access_page); if (kvm->arch.ept_identity_pagetable) put_page(kvm->arch.ept_identity_pagetable); cleanup_srcu_struct(&kvm->srcu); kfree(kvm->arch.aliases); kfree(kvm); } int kvm_arch_prepare_memory_region(struct kvm *kvm, struct kvm_memory_slot *memslot, struct kvm_memory_slot old, struct kvm_userspace_memory_region *mem, int user_alloc) { int npages = memslot->npages; /*To keep backward compatibility with older userspace, *x86 needs to hanlde !user_alloc case. */ if (!user_alloc) { if (npages && !old.rmap) { unsigned long userspace_addr; down_write(¤t->mm->mmap_sem); userspace_addr = do_mmap(NULL, 0, npages * PAGE_SIZE, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, 0); up_write(¤t->mm->mmap_sem); if (IS_ERR((void *)userspace_addr)) return PTR_ERR((void *)userspace_addr); memslot->userspace_addr = userspace_addr; } } return 0; } void kvm_arch_commit_memory_region(struct kvm *kvm, struct kvm_userspace_memory_region *mem, struct kvm_memory_slot old, int user_alloc) { int npages = mem->memory_size >> PAGE_SHIFT; if (!user_alloc && !old.user_alloc && old.rmap && !npages) { int ret; down_write(¤t->mm->mmap_sem); ret = do_munmap(current->mm, old.userspace_addr, old.npages * PAGE_SIZE); up_write(¤t->mm->mmap_sem); if (ret < 0) printk(KERN_WARNING "kvm_vm_ioctl_set_memory_region: " "failed to munmap memory\n"); } spin_lock(&kvm->mmu_lock); if (!kvm->arch.n_requested_mmu_pages) { unsigned int nr_mmu_pages = kvm_mmu_calculate_mmu_pages(kvm); kvm_mmu_change_mmu_pages(kvm, nr_mmu_pages); } kvm_mmu_slot_remove_write_access(kvm, mem->slot); spin_unlock(&kvm->mmu_lock); } void kvm_arch_flush_shadow(struct kvm *kvm) { kvm_mmu_zap_all(kvm); kvm_reload_remote_mmus(kvm); } int kvm_arch_vcpu_runnable(struct kvm_vcpu *vcpu) { return vcpu->arch.mp_state == KVM_MP_STATE_RUNNABLE || vcpu->arch.mp_state == KVM_MP_STATE_SIPI_RECEIVED || vcpu->arch.nmi_pending || (kvm_arch_interrupt_allowed(vcpu) && kvm_cpu_has_interrupt(vcpu)); } void kvm_vcpu_kick(struct kvm_vcpu *vcpu) { int me; int cpu = vcpu->cpu; if (waitqueue_active(&vcpu->wq)) { wake_up_interruptible(&vcpu->wq); ++vcpu->stat.halt_wakeup; } me = get_cpu(); if (cpu != me && (unsigned)cpu < nr_cpu_ids && cpu_online(cpu)) if (!test_and_set_bit(KVM_REQ_KICK, &vcpu->requests)) smp_send_reschedule(cpu); put_cpu(); } int kvm_arch_interrupt_allowed(struct kvm_vcpu *vcpu) { return kvm_x86_ops->interrupt_allowed(vcpu); } unsigned long kvm_get_rflags(struct kvm_vcpu *vcpu) { unsigned long rflags; rflags = kvm_x86_ops->get_rflags(vcpu); if (vcpu->guest_debug & KVM_GUESTDBG_SINGLESTEP) rflags &= ~(unsigned long)(X86_EFLAGS_TF | X86_EFLAGS_RF); return rflags; } EXPORT_SYMBOL_GPL(kvm_get_rflags); void kvm_set_rflags(struct kvm_vcpu *vcpu, unsigned long rflags) { if (vcpu->guest_debug & KVM_GUESTDBG_SINGLESTEP && vcpu->arch.singlestep_cs == get_segment_selector(vcpu, VCPU_SREG_CS) && vcpu->arch.singlestep_rip == kvm_rip_read(vcpu)) rflags |= X86_EFLAGS_TF | X86_EFLAGS_RF; kvm_x86_ops->set_rflags(vcpu, rflags); } EXPORT_SYMBOL_GPL(kvm_set_rflags); EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_exit); EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_inj_virq); EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_page_fault); EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_msr); EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_cr); EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_nested_vmrun); EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_nested_vmexit); EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_nested_vmexit_inject); EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_nested_intr_vmexit); EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_invlpga); EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_skinit);