/* * QEMU KVM support * * Copyright IBM, Corp. 2008 * Red Hat, Inc. 2008 * * Authors: * Anthony Liguori * Glauber Costa * * This work is licensed under the terms of the GNU GPL, version 2 or later. * See the COPYING file in the top-level directory. * */ #include "qemu/osdep.h" #include #include #include "qemu-common.h" #include "qemu/atomic.h" #include "qemu/option.h" #include "qemu/config-file.h" #include "qemu/error-report.h" #include "qapi/error.h" #include "hw/hw.h" #include "hw/pci/msi.h" #include "hw/pci/msix.h" #include "hw/s390x/adapter.h" #include "exec/gdbstub.h" #include "sysemu/kvm_int.h" #include "sysemu/cpus.h" #include "qemu/bswap.h" #include "exec/memory.h" #include "exec/ram_addr.h" #include "exec/address-spaces.h" #include "qemu/event_notifier.h" #include "trace.h" #include "hw/irq.h" #include "hw/boards.h" /* This check must be after config-host.h is included */ #ifdef CONFIG_EVENTFD #include #endif /* KVM uses PAGE_SIZE in its definition of KVM_COALESCED_MMIO_MAX. We * need to use the real host PAGE_SIZE, as that's what KVM will use. */ #define PAGE_SIZE getpagesize() //#define DEBUG_KVM #ifdef DEBUG_KVM #define DPRINTF(fmt, ...) \ do { fprintf(stderr, fmt, ## __VA_ARGS__); } while (0) #else #define DPRINTF(fmt, ...) \ do { } while (0) #endif #define KVM_MSI_HASHTAB_SIZE 256 struct KVMParkedVcpu { unsigned long vcpu_id; int kvm_fd; QLIST_ENTRY(KVMParkedVcpu) node; }; struct KVMState { AccelState parent_obj; int nr_slots; int fd; int vmfd; int coalesced_mmio; struct kvm_coalesced_mmio_ring *coalesced_mmio_ring; bool coalesced_flush_in_progress; int broken_set_mem_region; int vcpu_events; int robust_singlestep; int debugregs; #ifdef KVM_CAP_SET_GUEST_DEBUG struct kvm_sw_breakpoint_head kvm_sw_breakpoints; #endif int many_ioeventfds; int intx_set_mask; /* The man page (and posix) say ioctl numbers are signed int, but * they're not. Linux, glibc and *BSD all treat ioctl numbers as * unsigned, and treating them as signed here can break things */ unsigned irq_set_ioctl; unsigned int sigmask_len; GHashTable *gsimap; #ifdef KVM_CAP_IRQ_ROUTING struct kvm_irq_routing *irq_routes; int nr_allocated_irq_routes; unsigned long *used_gsi_bitmap; unsigned int gsi_count; QTAILQ_HEAD(msi_hashtab, KVMMSIRoute) msi_hashtab[KVM_MSI_HASHTAB_SIZE]; #endif KVMMemoryListener memory_listener; QLIST_HEAD(, KVMParkedVcpu) kvm_parked_vcpus; }; KVMState *kvm_state; bool kvm_kernel_irqchip; bool kvm_split_irqchip; bool kvm_async_interrupts_allowed; bool kvm_halt_in_kernel_allowed; bool kvm_eventfds_allowed; bool kvm_irqfds_allowed; bool kvm_resamplefds_allowed; bool kvm_msi_via_irqfd_allowed; bool kvm_gsi_routing_allowed; bool kvm_gsi_direct_mapping; bool kvm_allowed; bool kvm_readonly_mem_allowed; bool kvm_vm_attributes_allowed; bool kvm_direct_msi_allowed; bool kvm_ioeventfd_any_length_allowed; bool kvm_msi_use_devid; static bool kvm_immediate_exit; static const KVMCapabilityInfo kvm_required_capabilites[] = { KVM_CAP_INFO(USER_MEMORY), KVM_CAP_INFO(DESTROY_MEMORY_REGION_WORKS), KVM_CAP_LAST_INFO }; int kvm_get_max_memslots(void) { KVMState *s = KVM_STATE(current_machine->accelerator); return s->nr_slots; } static KVMSlot *kvm_get_free_slot(KVMMemoryListener *kml) { KVMState *s = kvm_state; int i; for (i = 0; i < s->nr_slots; i++) { if (kml->slots[i].memory_size == 0) { return &kml->slots[i]; } } return NULL; } bool kvm_has_free_slot(MachineState *ms) { KVMState *s = KVM_STATE(ms->accelerator); return kvm_get_free_slot(&s->memory_listener); } static KVMSlot *kvm_alloc_slot(KVMMemoryListener *kml) { KVMSlot *slot = kvm_get_free_slot(kml); if (slot) { return slot; } fprintf(stderr, "%s: no free slot available\n", __func__); abort(); } static KVMSlot *kvm_lookup_matching_slot(KVMMemoryListener *kml, hwaddr start_addr, hwaddr end_addr) { KVMState *s = kvm_state; int i; for (i = 0; i < s->nr_slots; i++) { KVMSlot *mem = &kml->slots[i]; if (start_addr == mem->start_addr && end_addr == mem->start_addr + mem->memory_size) { return mem; } } return NULL; } /* * Find overlapping slot with lowest start address */ static KVMSlot *kvm_lookup_overlapping_slot(KVMMemoryListener *kml, hwaddr start_addr, hwaddr end_addr) { KVMState *s = kvm_state; KVMSlot *found = NULL; int i; for (i = 0; i < s->nr_slots; i++) { KVMSlot *mem = &kml->slots[i]; if (mem->memory_size == 0 || (found && found->start_addr < mem->start_addr)) { continue; } if (end_addr > mem->start_addr && start_addr < mem->start_addr + mem->memory_size) { found = mem; } } return found; } int kvm_physical_memory_addr_from_host(KVMState *s, void *ram, hwaddr *phys_addr) { KVMMemoryListener *kml = &s->memory_listener; int i; for (i = 0; i < s->nr_slots; i++) { KVMSlot *mem = &kml->slots[i]; if (ram >= mem->ram && ram < mem->ram + mem->memory_size) { *phys_addr = mem->start_addr + (ram - mem->ram); return 1; } } return 0; } static int kvm_set_user_memory_region(KVMMemoryListener *kml, KVMSlot *slot) { KVMState *s = kvm_state; struct kvm_userspace_memory_region mem; mem.slot = slot->slot | (kml->as_id << 16); mem.guest_phys_addr = slot->start_addr; mem.userspace_addr = (unsigned long)slot->ram; mem.flags = slot->flags; if (slot->memory_size && mem.flags & KVM_MEM_READONLY) { /* Set the slot size to 0 before setting the slot to the desired * value. This is needed based on KVM commit 75d61fbc. */ mem.memory_size = 0; kvm_vm_ioctl(s, KVM_SET_USER_MEMORY_REGION, &mem); } mem.memory_size = slot->memory_size; return kvm_vm_ioctl(s, KVM_SET_USER_MEMORY_REGION, &mem); } int kvm_destroy_vcpu(CPUState *cpu) { KVMState *s = kvm_state; long mmap_size; struct KVMParkedVcpu *vcpu = NULL; int ret = 0; DPRINTF("kvm_destroy_vcpu\n"); mmap_size = kvm_ioctl(s, KVM_GET_VCPU_MMAP_SIZE, 0); if (mmap_size < 0) { ret = mmap_size; DPRINTF("KVM_GET_VCPU_MMAP_SIZE failed\n"); goto err; } ret = munmap(cpu->kvm_run, mmap_size); if (ret < 0) { goto err; } vcpu = g_malloc0(sizeof(*vcpu)); vcpu->vcpu_id = kvm_arch_vcpu_id(cpu); vcpu->kvm_fd = cpu->kvm_fd; QLIST_INSERT_HEAD(&kvm_state->kvm_parked_vcpus, vcpu, node); err: return ret; } static int kvm_get_vcpu(KVMState *s, unsigned long vcpu_id) { struct KVMParkedVcpu *cpu; QLIST_FOREACH(cpu, &s->kvm_parked_vcpus, node) { if (cpu->vcpu_id == vcpu_id) { int kvm_fd; QLIST_REMOVE(cpu, node); kvm_fd = cpu->kvm_fd; g_free(cpu); return kvm_fd; } } return kvm_vm_ioctl(s, KVM_CREATE_VCPU, (void *)vcpu_id); } int kvm_init_vcpu(CPUState *cpu) { KVMState *s = kvm_state; long mmap_size; int ret; DPRINTF("kvm_init_vcpu\n"); ret = kvm_get_vcpu(s, kvm_arch_vcpu_id(cpu)); if (ret < 0) { DPRINTF("kvm_create_vcpu failed\n"); goto err; } cpu->kvm_fd = ret; cpu->kvm_state = s; cpu->vcpu_dirty = true; mmap_size = kvm_ioctl(s, KVM_GET_VCPU_MMAP_SIZE, 0); if (mmap_size < 0) { ret = mmap_size; DPRINTF("KVM_GET_VCPU_MMAP_SIZE failed\n"); goto err; } cpu->kvm_run = mmap(NULL, mmap_size, PROT_READ | PROT_WRITE, MAP_SHARED, cpu->kvm_fd, 0); if (cpu->kvm_run == MAP_FAILED) { ret = -errno; DPRINTF("mmap'ing vcpu state failed\n"); goto err; } if (s->coalesced_mmio && !s->coalesced_mmio_ring) { s->coalesced_mmio_ring = (void *)cpu->kvm_run + s->coalesced_mmio * PAGE_SIZE; } ret = kvm_arch_init_vcpu(cpu); err: return ret; } /* * dirty pages logging control */ static int kvm_mem_flags(MemoryRegion *mr) { bool readonly = mr->readonly || memory_region_is_romd(mr); int flags = 0; if (memory_region_get_dirty_log_mask(mr) != 0) { flags |= KVM_MEM_LOG_DIRTY_PAGES; } if (readonly && kvm_readonly_mem_allowed) { flags |= KVM_MEM_READONLY; } return flags; } static int kvm_slot_update_flags(KVMMemoryListener *kml, KVMSlot *mem, MemoryRegion *mr) { int old_flags; old_flags = mem->flags; mem->flags = kvm_mem_flags(mr); /* If nothing changed effectively, no need to issue ioctl */ if (mem->flags == old_flags) { return 0; } return kvm_set_user_memory_region(kml, mem); } static int kvm_section_update_flags(KVMMemoryListener *kml, MemoryRegionSection *section) { hwaddr phys_addr = section->offset_within_address_space; ram_addr_t size = int128_get64(section->size); KVMSlot *mem = kvm_lookup_matching_slot(kml, phys_addr, phys_addr + size); if (mem == NULL) { return 0; } else { return kvm_slot_update_flags(kml, mem, section->mr); } } static void kvm_log_start(MemoryListener *listener, MemoryRegionSection *section, int old, int new) { KVMMemoryListener *kml = container_of(listener, KVMMemoryListener, listener); int r; if (old != 0) { return; } r = kvm_section_update_flags(kml, section); if (r < 0) { abort(); } } static void kvm_log_stop(MemoryListener *listener, MemoryRegionSection *section, int old, int new) { KVMMemoryListener *kml = container_of(listener, KVMMemoryListener, listener); int r; if (new != 0) { return; } r = kvm_section_update_flags(kml, section); if (r < 0) { abort(); } } /* get kvm's dirty pages bitmap and update qemu's */ static int kvm_get_dirty_pages_log_range(MemoryRegionSection *section, unsigned long *bitmap) { ram_addr_t start = section->offset_within_region + memory_region_get_ram_addr(section->mr); ram_addr_t pages = int128_get64(section->size) / getpagesize(); cpu_physical_memory_set_dirty_lebitmap(bitmap, start, pages); return 0; } #define ALIGN(x, y) (((x)+(y)-1) & ~((y)-1)) /** * kvm_physical_sync_dirty_bitmap - Grab dirty bitmap from kernel space * This function updates qemu's dirty bitmap using * memory_region_set_dirty(). This means all bits are set * to dirty. * * @start_add: start of logged region. * @end_addr: end of logged region. */ static int kvm_physical_sync_dirty_bitmap(KVMMemoryListener *kml, MemoryRegionSection *section) { KVMState *s = kvm_state; unsigned long size, allocated_size = 0; struct kvm_dirty_log d = {}; KVMSlot *mem; int ret = 0; hwaddr start_addr = section->offset_within_address_space; hwaddr end_addr = start_addr + int128_get64(section->size); d.dirty_bitmap = NULL; while (start_addr < end_addr) { mem = kvm_lookup_overlapping_slot(kml, start_addr, end_addr); if (mem == NULL) { break; } /* XXX bad kernel interface alert * For dirty bitmap, kernel allocates array of size aligned to * bits-per-long. But for case when the kernel is 64bits and * the userspace is 32bits, userspace can't align to the same * bits-per-long, since sizeof(long) is different between kernel * and user space. This way, userspace will provide buffer which * may be 4 bytes less than the kernel will use, resulting in * userspace memory corruption (which is not detectable by valgrind * too, in most cases). * So for now, let's align to 64 instead of HOST_LONG_BITS here, in * a hope that sizeof(long) won't become >8 any time soon. */ size = ALIGN(((mem->memory_size) >> TARGET_PAGE_BITS), /*HOST_LONG_BITS*/ 64) / 8; if (!d.dirty_bitmap) { d.dirty_bitmap = g_malloc(size); } else if (size > allocated_size) { d.dirty_bitmap = g_realloc(d.dirty_bitmap, size); } allocated_size = size; memset(d.dirty_bitmap, 0, allocated_size); d.slot = mem->slot | (kml->as_id << 16); if (kvm_vm_ioctl(s, KVM_GET_DIRTY_LOG, &d) == -1) { DPRINTF("ioctl failed %d\n", errno); ret = -1; break; } kvm_get_dirty_pages_log_range(section, d.dirty_bitmap); start_addr = mem->start_addr + mem->memory_size; } g_free(d.dirty_bitmap); return ret; } static void kvm_coalesce_mmio_region(MemoryListener *listener, MemoryRegionSection *secion, hwaddr start, hwaddr size) { KVMState *s = kvm_state; if (s->coalesced_mmio) { struct kvm_coalesced_mmio_zone zone; zone.addr = start; zone.size = size; zone.pad = 0; (void)kvm_vm_ioctl(s, KVM_REGISTER_COALESCED_MMIO, &zone); } } static void kvm_uncoalesce_mmio_region(MemoryListener *listener, MemoryRegionSection *secion, hwaddr start, hwaddr size) { KVMState *s = kvm_state; if (s->coalesced_mmio) { struct kvm_coalesced_mmio_zone zone; zone.addr = start; zone.size = size; zone.pad = 0; (void)kvm_vm_ioctl(s, KVM_UNREGISTER_COALESCED_MMIO, &zone); } } int kvm_check_extension(KVMState *s, unsigned int extension) { int ret; ret = kvm_ioctl(s, KVM_CHECK_EXTENSION, extension); if (ret < 0) { ret = 0; } return ret; } int kvm_vm_check_extension(KVMState *s, unsigned int extension) { int ret; ret = kvm_vm_ioctl(s, KVM_CHECK_EXTENSION, extension); if (ret < 0) { /* VM wide version not implemented, use global one instead */ ret = kvm_check_extension(s, extension); } return ret; } static uint32_t adjust_ioeventfd_endianness(uint32_t val, uint32_t size) { #if defined(HOST_WORDS_BIGENDIAN) != defined(TARGET_WORDS_BIGENDIAN) /* The kernel expects ioeventfd values in HOST_WORDS_BIGENDIAN * endianness, but the memory core hands them in target endianness. * For example, PPC is always treated as big-endian even if running * on KVM and on PPC64LE. Correct here. */ switch (size) { case 2: val = bswap16(val); break; case 4: val = bswap32(val); break; } #endif return val; } static int kvm_set_ioeventfd_mmio(int fd, hwaddr addr, uint32_t val, bool assign, uint32_t size, bool datamatch) { int ret; struct kvm_ioeventfd iofd = { .datamatch = datamatch ? adjust_ioeventfd_endianness(val, size) : 0, .addr = addr, .len = size, .flags = 0, .fd = fd, }; if (!kvm_enabled()) { return -ENOSYS; } if (datamatch) { iofd.flags |= KVM_IOEVENTFD_FLAG_DATAMATCH; } if (!assign) { iofd.flags |= KVM_IOEVENTFD_FLAG_DEASSIGN; } ret = kvm_vm_ioctl(kvm_state, KVM_IOEVENTFD, &iofd); if (ret < 0) { return -errno; } return 0; } static int kvm_set_ioeventfd_pio(int fd, uint16_t addr, uint16_t val, bool assign, uint32_t size, bool datamatch) { struct kvm_ioeventfd kick = { .datamatch = datamatch ? adjust_ioeventfd_endianness(val, size) : 0, .addr = addr, .flags = KVM_IOEVENTFD_FLAG_PIO, .len = size, .fd = fd, }; int r; if (!kvm_enabled()) { return -ENOSYS; } if (datamatch) { kick.flags |= KVM_IOEVENTFD_FLAG_DATAMATCH; } if (!assign) { kick.flags |= KVM_IOEVENTFD_FLAG_DEASSIGN; } r = kvm_vm_ioctl(kvm_state, KVM_IOEVENTFD, &kick); if (r < 0) { return r; } return 0; } static int kvm_check_many_ioeventfds(void) { /* Userspace can use ioeventfd for io notification. This requires a host * that supports eventfd(2) and an I/O thread; since eventfd does not * support SIGIO it cannot interrupt the vcpu. * * Older kernels have a 6 device limit on the KVM io bus. Find out so we * can avoid creating too many ioeventfds. */ #if defined(CONFIG_EVENTFD) int ioeventfds[7]; int i, ret = 0; for (i = 0; i < ARRAY_SIZE(ioeventfds); i++) { ioeventfds[i] = eventfd(0, EFD_CLOEXEC); if (ioeventfds[i] < 0) { break; } ret = kvm_set_ioeventfd_pio(ioeventfds[i], 0, i, true, 2, true); if (ret < 0) { close(ioeventfds[i]); break; } } /* Decide whether many devices are supported or not */ ret = i == ARRAY_SIZE(ioeventfds); while (i-- > 0) { kvm_set_ioeventfd_pio(ioeventfds[i], 0, i, false, 2, true); close(ioeventfds[i]); } return ret; #else return 0; #endif } static const KVMCapabilityInfo * kvm_check_extension_list(KVMState *s, const KVMCapabilityInfo *list) { while (list->name) { if (!kvm_check_extension(s, list->value)) { return list; } list++; } return NULL; } static void kvm_set_phys_mem(KVMMemoryListener *kml, MemoryRegionSection *section, bool add) { KVMState *s = kvm_state; KVMSlot *mem, old; int err; MemoryRegion *mr = section->mr; bool writeable = !mr->readonly && !mr->rom_device; hwaddr start_addr = section->offset_within_address_space; ram_addr_t size = int128_get64(section->size); void *ram = NULL; unsigned delta; /* kvm works in page size chunks, but the function may be called with sub-page size and unaligned start address. Pad the start address to next and truncate size to previous page boundary. */ delta = qemu_real_host_page_size - (start_addr & ~qemu_real_host_page_mask); delta &= ~qemu_real_host_page_mask; if (delta > size) { return; } start_addr += delta; size -= delta; size &= qemu_real_host_page_mask; if (!size || (start_addr & ~qemu_real_host_page_mask)) { return; } if (!memory_region_is_ram(mr)) { if (writeable || !kvm_readonly_mem_allowed) { return; } else if (!mr->romd_mode) { /* If the memory device is not in romd_mode, then we actually want * to remove the kvm memory slot so all accesses will trap. */ add = false; } } ram = memory_region_get_ram_ptr(mr) + section->offset_within_region + delta; while (1) { mem = kvm_lookup_overlapping_slot(kml, start_addr, start_addr + size); if (!mem) { break; } if (add && start_addr >= mem->start_addr && (start_addr + size <= mem->start_addr + mem->memory_size) && (ram - start_addr == mem->ram - mem->start_addr)) { /* The new slot fits into the existing one and comes with * identical parameters - update flags and done. */ kvm_slot_update_flags(kml, mem, mr); return; } old = *mem; if (mem->flags & KVM_MEM_LOG_DIRTY_PAGES) { kvm_physical_sync_dirty_bitmap(kml, section); } /* unregister the overlapping slot */ mem->memory_size = 0; err = kvm_set_user_memory_region(kml, mem); if (err) { fprintf(stderr, "%s: error unregistering overlapping slot: %s\n", __func__, strerror(-err)); abort(); } /* Workaround for older KVM versions: we can't join slots, even not by * unregistering the previous ones and then registering the larger * slot. We have to maintain the existing fragmentation. Sigh. * * This workaround assumes that the new slot starts at the same * address as the first existing one. If not or if some overlapping * slot comes around later, we will fail (not seen in practice so far) * - and actually require a recent KVM version. */ if (s->broken_set_mem_region && old.start_addr == start_addr && old.memory_size < size && add) { mem = kvm_alloc_slot(kml); mem->memory_size = old.memory_size; mem->start_addr = old.start_addr; mem->ram = old.ram; mem->flags = kvm_mem_flags(mr); err = kvm_set_user_memory_region(kml, mem); if (err) { fprintf(stderr, "%s: error updating slot: %s\n", __func__, strerror(-err)); abort(); } start_addr += old.memory_size; ram += old.memory_size; size -= old.memory_size; continue; } /* register prefix slot */ if (old.start_addr < start_addr) { mem = kvm_alloc_slot(kml); mem->memory_size = start_addr - old.start_addr; mem->start_addr = old.start_addr; mem->ram = old.ram; mem->flags = kvm_mem_flags(mr); err = kvm_set_user_memory_region(kml, mem); if (err) { fprintf(stderr, "%s: error registering prefix slot: %s\n", __func__, strerror(-err)); #ifdef TARGET_PPC fprintf(stderr, "%s: This is probably because your kernel's " \ "PAGE_SIZE is too big. Please try to use 4k " \ "PAGE_SIZE!\n", __func__); #endif abort(); } } /* register suffix slot */ if (old.start_addr + old.memory_size > start_addr + size) { ram_addr_t size_delta; mem = kvm_alloc_slot(kml); mem->start_addr = start_addr + size; size_delta = mem->start_addr - old.start_addr; mem->memory_size = old.memory_size - size_delta; mem->ram = old.ram + size_delta; mem->flags = kvm_mem_flags(mr); err = kvm_set_user_memory_region(kml, mem); if (err) { fprintf(stderr, "%s: error registering suffix slot: %s\n", __func__, strerror(-err)); abort(); } } } /* in case the KVM bug workaround already "consumed" the new slot */ if (!size) { return; } if (!add) { return; } mem = kvm_alloc_slot(kml); mem->memory_size = size; mem->start_addr = start_addr; mem->ram = ram; mem->flags = kvm_mem_flags(mr); err = kvm_set_user_memory_region(kml, mem); if (err) { fprintf(stderr, "%s: error registering slot: %s\n", __func__, strerror(-err)); abort(); } } static void kvm_region_add(MemoryListener *listener, MemoryRegionSection *section) { KVMMemoryListener *kml = container_of(listener, KVMMemoryListener, listener); memory_region_ref(section->mr); kvm_set_phys_mem(kml, section, true); } static void kvm_region_del(MemoryListener *listener, MemoryRegionSection *section) { KVMMemoryListener *kml = container_of(listener, KVMMemoryListener, listener); kvm_set_phys_mem(kml, section, false); memory_region_unref(section->mr); } static void kvm_log_sync(MemoryListener *listener, MemoryRegionSection *section) { KVMMemoryListener *kml = container_of(listener, KVMMemoryListener, listener); int r; r = kvm_physical_sync_dirty_bitmap(kml, section); if (r < 0) { abort(); } } static void kvm_mem_ioeventfd_add(MemoryListener *listener, MemoryRegionSection *section, bool match_data, uint64_t data, EventNotifier *e) { int fd = event_notifier_get_fd(e); int r; r = kvm_set_ioeventfd_mmio(fd, section->offset_within_address_space, data, true, int128_get64(section->size), match_data); if (r < 0) { fprintf(stderr, "%s: error adding ioeventfd: %s\n", __func__, strerror(-r)); abort(); } } static void kvm_mem_ioeventfd_del(MemoryListener *listener, MemoryRegionSection *section, bool match_data, uint64_t data, EventNotifier *e) { int fd = event_notifier_get_fd(e); int r; r = kvm_set_ioeventfd_mmio(fd, section->offset_within_address_space, data, false, int128_get64(section->size), match_data); if (r < 0) { abort(); } } static void kvm_io_ioeventfd_add(MemoryListener *listener, MemoryRegionSection *section, bool match_data, uint64_t data, EventNotifier *e) { int fd = event_notifier_get_fd(e); int r; r = kvm_set_ioeventfd_pio(fd, section->offset_within_address_space, data, true, int128_get64(section->size), match_data); if (r < 0) { fprintf(stderr, "%s: error adding ioeventfd: %s\n", __func__, strerror(-r)); abort(); } } static void kvm_io_ioeventfd_del(MemoryListener *listener, MemoryRegionSection *section, bool match_data, uint64_t data, EventNotifier *e) { int fd = event_notifier_get_fd(e); int r; r = kvm_set_ioeventfd_pio(fd, section->offset_within_address_space, data, false, int128_get64(section->size), match_data); if (r < 0) { abort(); } } void kvm_memory_listener_register(KVMState *s, KVMMemoryListener *kml, AddressSpace *as, int as_id) { int i; kml->slots = g_malloc0(s->nr_slots * sizeof(KVMSlot)); kml->as_id = as_id; for (i = 0; i < s->nr_slots; i++) { kml->slots[i].slot = i; } kml->listener.region_add = kvm_region_add; kml->listener.region_del = kvm_region_del; kml->listener.log_start = kvm_log_start; kml->listener.log_stop = kvm_log_stop; kml->listener.log_sync = kvm_log_sync; kml->listener.priority = 10; memory_listener_register(&kml->listener, as); } static MemoryListener kvm_io_listener = { .eventfd_add = kvm_io_ioeventfd_add, .eventfd_del = kvm_io_ioeventfd_del, .priority = 10, }; int kvm_set_irq(KVMState *s, int irq, int level) { struct kvm_irq_level event; int ret; assert(kvm_async_interrupts_enabled()); event.level = level; event.irq = irq; ret = kvm_vm_ioctl(s, s->irq_set_ioctl, &event); if (ret < 0) { perror("kvm_set_irq"); abort(); } return (s->irq_set_ioctl == KVM_IRQ_LINE) ? 1 : event.status; } #ifdef KVM_CAP_IRQ_ROUTING typedef struct KVMMSIRoute { struct kvm_irq_routing_entry kroute; QTAILQ_ENTRY(KVMMSIRoute) entry; } KVMMSIRoute; static void set_gsi(KVMState *s, unsigned int gsi) { set_bit(gsi, s->used_gsi_bitmap); } static void clear_gsi(KVMState *s, unsigned int gsi) { clear_bit(gsi, s->used_gsi_bitmap); } void kvm_init_irq_routing(KVMState *s) { int gsi_count, i; gsi_count = kvm_check_extension(s, KVM_CAP_IRQ_ROUTING) - 1; if (gsi_count > 0) { /* Round up so we can search ints using ffs */ s->used_gsi_bitmap = bitmap_new(gsi_count); s->gsi_count = gsi_count; } s->irq_routes = g_malloc0(sizeof(*s->irq_routes)); s->nr_allocated_irq_routes = 0; if (!kvm_direct_msi_allowed) { for (i = 0; i < KVM_MSI_HASHTAB_SIZE; i++) { QTAILQ_INIT(&s->msi_hashtab[i]); } } kvm_arch_init_irq_routing(s); } void kvm_irqchip_commit_routes(KVMState *s) { int ret; if (kvm_gsi_direct_mapping()) { return; } if (!kvm_gsi_routing_enabled()) { return; } s->irq_routes->flags = 0; trace_kvm_irqchip_commit_routes(); ret = kvm_vm_ioctl(s, KVM_SET_GSI_ROUTING, s->irq_routes); assert(ret == 0); } static void kvm_add_routing_entry(KVMState *s, struct kvm_irq_routing_entry *entry) { struct kvm_irq_routing_entry *new; int n, size; if (s->irq_routes->nr == s->nr_allocated_irq_routes) { n = s->nr_allocated_irq_routes * 2; if (n < 64) { n = 64; } size = sizeof(struct kvm_irq_routing); size += n * sizeof(*new); s->irq_routes = g_realloc(s->irq_routes, size); s->nr_allocated_irq_routes = n; } n = s->irq_routes->nr++; new = &s->irq_routes->entries[n]; *new = *entry; set_gsi(s, entry->gsi); } static int kvm_update_routing_entry(KVMState *s, struct kvm_irq_routing_entry *new_entry) { struct kvm_irq_routing_entry *entry; int n; for (n = 0; n < s->irq_routes->nr; n++) { entry = &s->irq_routes->entries[n]; if (entry->gsi != new_entry->gsi) { continue; } if(!memcmp(entry, new_entry, sizeof *entry)) { return 0; } *entry = *new_entry; return 0; } return -ESRCH; } void kvm_irqchip_add_irq_route(KVMState *s, int irq, int irqchip, int pin) { struct kvm_irq_routing_entry e = {}; assert(pin < s->gsi_count); e.gsi = irq; e.type = KVM_IRQ_ROUTING_IRQCHIP; e.flags = 0; e.u.irqchip.irqchip = irqchip; e.u.irqchip.pin = pin; kvm_add_routing_entry(s, &e); } void kvm_irqchip_release_virq(KVMState *s, int virq) { struct kvm_irq_routing_entry *e; int i; if (kvm_gsi_direct_mapping()) { return; } for (i = 0; i < s->irq_routes->nr; i++) { e = &s->irq_routes->entries[i]; if (e->gsi == virq) { s->irq_routes->nr--; *e = s->irq_routes->entries[s->irq_routes->nr]; } } clear_gsi(s, virq); kvm_arch_release_virq_post(virq); trace_kvm_irqchip_release_virq(virq); } static unsigned int kvm_hash_msi(uint32_t data) { /* This is optimized for IA32 MSI layout. However, no other arch shall * repeat the mistake of not providing a direct MSI injection API. */ return data & 0xff; } static void kvm_flush_dynamic_msi_routes(KVMState *s) { KVMMSIRoute *route, *next; unsigned int hash; for (hash = 0; hash < KVM_MSI_HASHTAB_SIZE; hash++) { QTAILQ_FOREACH_SAFE(route, &s->msi_hashtab[hash], entry, next) { kvm_irqchip_release_virq(s, route->kroute.gsi); QTAILQ_REMOVE(&s->msi_hashtab[hash], route, entry); g_free(route); } } } static int kvm_irqchip_get_virq(KVMState *s) { int next_virq; /* * PIC and IOAPIC share the first 16 GSI numbers, thus the available * GSI numbers are more than the number of IRQ route. Allocating a GSI * number can succeed even though a new route entry cannot be added. * When this happens, flush dynamic MSI entries to free IRQ route entries. */ if (!kvm_direct_msi_allowed && s->irq_routes->nr == s->gsi_count) { kvm_flush_dynamic_msi_routes(s); } /* Return the lowest unused GSI in the bitmap */ next_virq = find_first_zero_bit(s->used_gsi_bitmap, s->gsi_count); if (next_virq >= s->gsi_count) { return -ENOSPC; } else { return next_virq; } } static KVMMSIRoute *kvm_lookup_msi_route(KVMState *s, MSIMessage msg) { unsigned int hash = kvm_hash_msi(msg.data); KVMMSIRoute *route; QTAILQ_FOREACH(route, &s->msi_hashtab[hash], entry) { if (route->kroute.u.msi.address_lo == (uint32_t)msg.address && route->kroute.u.msi.address_hi == (msg.address >> 32) && route->kroute.u.msi.data == le32_to_cpu(msg.data)) { return route; } } return NULL; } int kvm_irqchip_send_msi(KVMState *s, MSIMessage msg) { struct kvm_msi msi; KVMMSIRoute *route; if (kvm_direct_msi_allowed) { msi.address_lo = (uint32_t)msg.address; msi.address_hi = msg.address >> 32; msi.data = le32_to_cpu(msg.data); msi.flags = 0; memset(msi.pad, 0, sizeof(msi.pad)); return kvm_vm_ioctl(s, KVM_SIGNAL_MSI, &msi); } route = kvm_lookup_msi_route(s, msg); if (!route) { int virq; virq = kvm_irqchip_get_virq(s); if (virq < 0) { return virq; } route = g_malloc0(sizeof(KVMMSIRoute)); route->kroute.gsi = virq; route->kroute.type = KVM_IRQ_ROUTING_MSI; route->kroute.flags = 0; route->kroute.u.msi.address_lo = (uint32_t)msg.address; route->kroute.u.msi.address_hi = msg.address >> 32; route->kroute.u.msi.data = le32_to_cpu(msg.data); kvm_add_routing_entry(s, &route->kroute); kvm_irqchip_commit_routes(s); QTAILQ_INSERT_TAIL(&s->msi_hashtab[kvm_hash_msi(msg.data)], route, entry); } assert(route->kroute.type == KVM_IRQ_ROUTING_MSI); return kvm_set_irq(s, route->kroute.gsi, 1); } int kvm_irqchip_add_msi_route(KVMState *s, int vector, PCIDevice *dev) { struct kvm_irq_routing_entry kroute = {}; int virq; MSIMessage msg = {0, 0}; if (pci_available && dev) { msg = pci_get_msi_message(dev, vector); } if (kvm_gsi_direct_mapping()) { return kvm_arch_msi_data_to_gsi(msg.data); } if (!kvm_gsi_routing_enabled()) { return -ENOSYS; } virq = kvm_irqchip_get_virq(s); if (virq < 0) { return virq; } kroute.gsi = virq; kroute.type = KVM_IRQ_ROUTING_MSI; kroute.flags = 0; kroute.u.msi.address_lo = (uint32_t)msg.address; kroute.u.msi.address_hi = msg.address >> 32; kroute.u.msi.data = le32_to_cpu(msg.data); if (pci_available && kvm_msi_devid_required()) { kroute.flags = KVM_MSI_VALID_DEVID; kroute.u.msi.devid = pci_requester_id(dev); } if (kvm_arch_fixup_msi_route(&kroute, msg.address, msg.data, dev)) { kvm_irqchip_release_virq(s, virq); return -EINVAL; } trace_kvm_irqchip_add_msi_route(dev ? dev->name : (char *)"N/A", vector, virq); kvm_add_routing_entry(s, &kroute); kvm_arch_add_msi_route_post(&kroute, vector, dev); kvm_irqchip_commit_routes(s); return virq; } int kvm_irqchip_update_msi_route(KVMState *s, int virq, MSIMessage msg, PCIDevice *dev) { struct kvm_irq_routing_entry kroute = {}; if (kvm_gsi_direct_mapping()) { return 0; } if (!kvm_irqchip_in_kernel()) { return -ENOSYS; } kroute.gsi = virq; kroute.type = KVM_IRQ_ROUTING_MSI; kroute.flags = 0; kroute.u.msi.address_lo = (uint32_t)msg.address; kroute.u.msi.address_hi = msg.address >> 32; kroute.u.msi.data = le32_to_cpu(msg.data); if (pci_available && kvm_msi_devid_required()) { kroute.flags = KVM_MSI_VALID_DEVID; kroute.u.msi.devid = pci_requester_id(dev); } if (kvm_arch_fixup_msi_route(&kroute, msg.address, msg.data, dev)) { return -EINVAL; } trace_kvm_irqchip_update_msi_route(virq); return kvm_update_routing_entry(s, &kroute); } static int kvm_irqchip_assign_irqfd(KVMState *s, int fd, int rfd, int virq, bool assign) { struct kvm_irqfd irqfd = { .fd = fd, .gsi = virq, .flags = assign ? 0 : KVM_IRQFD_FLAG_DEASSIGN, }; if (rfd != -1) { irqfd.flags |= KVM_IRQFD_FLAG_RESAMPLE; irqfd.resamplefd = rfd; } if (!kvm_irqfds_enabled()) { return -ENOSYS; } return kvm_vm_ioctl(s, KVM_IRQFD, &irqfd); } int kvm_irqchip_add_adapter_route(KVMState *s, AdapterInfo *adapter) { struct kvm_irq_routing_entry kroute = {}; int virq; if (!kvm_gsi_routing_enabled()) { return -ENOSYS; } virq = kvm_irqchip_get_virq(s); if (virq < 0) { return virq; } kroute.gsi = virq; kroute.type = KVM_IRQ_ROUTING_S390_ADAPTER; kroute.flags = 0; kroute.u.adapter.summary_addr = adapter->summary_addr; kroute.u.adapter.ind_addr = adapter->ind_addr; kroute.u.adapter.summary_offset = adapter->summary_offset; kroute.u.adapter.ind_offset = adapter->ind_offset; kroute.u.adapter.adapter_id = adapter->adapter_id; kvm_add_routing_entry(s, &kroute); return virq; } int kvm_irqchip_add_hv_sint_route(KVMState *s, uint32_t vcpu, uint32_t sint) { struct kvm_irq_routing_entry kroute = {}; int virq; if (!kvm_gsi_routing_enabled()) { return -ENOSYS; } if (!kvm_check_extension(s, KVM_CAP_HYPERV_SYNIC)) { return -ENOSYS; } virq = kvm_irqchip_get_virq(s); if (virq < 0) { return virq; } kroute.gsi = virq; kroute.type = KVM_IRQ_ROUTING_HV_SINT; kroute.flags = 0; kroute.u.hv_sint.vcpu = vcpu; kroute.u.hv_sint.sint = sint; kvm_add_routing_entry(s, &kroute); kvm_irqchip_commit_routes(s); return virq; } #else /* !KVM_CAP_IRQ_ROUTING */ void kvm_init_irq_routing(KVMState *s) { } void kvm_irqchip_release_virq(KVMState *s, int virq) { } int kvm_irqchip_send_msi(KVMState *s, MSIMessage msg) { abort(); } int kvm_irqchip_add_msi_route(KVMState *s, int vector, PCIDevice *dev) { return -ENOSYS; } int kvm_irqchip_add_adapter_route(KVMState *s, AdapterInfo *adapter) { return -ENOSYS; } int kvm_irqchip_add_hv_sint_route(KVMState *s, uint32_t vcpu, uint32_t sint) { return -ENOSYS; } static int kvm_irqchip_assign_irqfd(KVMState *s, int fd, int virq, bool assign) { abort(); } int kvm_irqchip_update_msi_route(KVMState *s, int virq, MSIMessage msg) { return -ENOSYS; } #endif /* !KVM_CAP_IRQ_ROUTING */ int kvm_irqchip_add_irqfd_notifier_gsi(KVMState *s, EventNotifier *n, EventNotifier *rn, int virq) { return kvm_irqchip_assign_irqfd(s, event_notifier_get_fd(n), rn ? event_notifier_get_fd(rn) : -1, virq, true); } int kvm_irqchip_remove_irqfd_notifier_gsi(KVMState *s, EventNotifier *n, int virq) { return kvm_irqchip_assign_irqfd(s, event_notifier_get_fd(n), -1, virq, false); } int kvm_irqchip_add_irqfd_notifier(KVMState *s, EventNotifier *n, EventNotifier *rn, qemu_irq irq) { gpointer key, gsi; gboolean found = g_hash_table_lookup_extended(s->gsimap, irq, &key, &gsi); if (!found) { return -ENXIO; } return kvm_irqchip_add_irqfd_notifier_gsi(s, n, rn, GPOINTER_TO_INT(gsi)); } int kvm_irqchip_remove_irqfd_notifier(KVMState *s, EventNotifier *n, qemu_irq irq) { gpointer key, gsi; gboolean found = g_hash_table_lookup_extended(s->gsimap, irq, &key, &gsi); if (!found) { return -ENXIO; } return kvm_irqchip_remove_irqfd_notifier_gsi(s, n, GPOINTER_TO_INT(gsi)); } void kvm_irqchip_set_qemuirq_gsi(KVMState *s, qemu_irq irq, int gsi) { g_hash_table_insert(s->gsimap, irq, GINT_TO_POINTER(gsi)); } static void kvm_irqchip_create(MachineState *machine, KVMState *s) { int ret; if (kvm_check_extension(s, KVM_CAP_IRQCHIP)) { ; } else if (kvm_check_extension(s, KVM_CAP_S390_IRQCHIP)) { ret = kvm_vm_enable_cap(s, KVM_CAP_S390_IRQCHIP, 0); if (ret < 0) { fprintf(stderr, "Enable kernel irqchip failed: %s\n", strerror(-ret)); exit(1); } } else { return; } /* First probe and see if there's a arch-specific hook to create the * in-kernel irqchip for us */ ret = kvm_arch_irqchip_create(machine, s); if (ret == 0) { if (machine_kernel_irqchip_split(machine)) { perror("Split IRQ chip mode not supported."); exit(1); } else { ret = kvm_vm_ioctl(s, KVM_CREATE_IRQCHIP); } } if (ret < 0) { fprintf(stderr, "Create kernel irqchip failed: %s\n", strerror(-ret)); exit(1); } kvm_kernel_irqchip = true; /* If we have an in-kernel IRQ chip then we must have asynchronous * interrupt delivery (though the reverse is not necessarily true) */ kvm_async_interrupts_allowed = true; kvm_halt_in_kernel_allowed = true; kvm_init_irq_routing(s); s->gsimap = g_hash_table_new(g_direct_hash, g_direct_equal); } /* Find number of supported CPUs using the recommended * procedure from the kernel API documentation to cope with * older kernels that may be missing capabilities. */ static int kvm_recommended_vcpus(KVMState *s) { int ret = kvm_check_extension(s, KVM_CAP_NR_VCPUS); return (ret) ? ret : 4; } static int kvm_max_vcpus(KVMState *s) { int ret = kvm_check_extension(s, KVM_CAP_MAX_VCPUS); return (ret) ? ret : kvm_recommended_vcpus(s); } static int kvm_max_vcpu_id(KVMState *s) { int ret = kvm_check_extension(s, KVM_CAP_MAX_VCPU_ID); return (ret) ? ret : kvm_max_vcpus(s); } bool kvm_vcpu_id_is_valid(int vcpu_id) { KVMState *s = KVM_STATE(current_machine->accelerator); return vcpu_id >= 0 && vcpu_id < kvm_max_vcpu_id(s); } static int kvm_init(MachineState *ms) { MachineClass *mc = MACHINE_GET_CLASS(ms); static const char upgrade_note[] = "Please upgrade to at least kernel 2.6.29 or recent kvm-kmod\n" "(see http://sourceforge.net/projects/kvm).\n"; struct { const char *name; int num; } num_cpus[] = { { "SMP", smp_cpus }, { "hotpluggable", max_cpus }, { NULL, } }, *nc = num_cpus; int soft_vcpus_limit, hard_vcpus_limit; KVMState *s; const KVMCapabilityInfo *missing_cap; int ret; int type = 0; const char *kvm_type; s = KVM_STATE(ms->accelerator); /* * On systems where the kernel can support different base page * sizes, host page size may be different from TARGET_PAGE_SIZE, * even with KVM. TARGET_PAGE_SIZE is assumed to be the minimum * page size for the system though. */ assert(TARGET_PAGE_SIZE <= getpagesize()); s->sigmask_len = 8; #ifdef KVM_CAP_SET_GUEST_DEBUG QTAILQ_INIT(&s->kvm_sw_breakpoints); #endif QLIST_INIT(&s->kvm_parked_vcpus); s->vmfd = -1; s->fd = qemu_open("/dev/kvm", O_RDWR); if (s->fd == -1) { fprintf(stderr, "Could not access KVM kernel module: %m\n"); ret = -errno; goto err; } ret = kvm_ioctl(s, KVM_GET_API_VERSION, 0); if (ret < KVM_API_VERSION) { if (ret >= 0) { ret = -EINVAL; } fprintf(stderr, "kvm version too old\n"); goto err; } if (ret > KVM_API_VERSION) { ret = -EINVAL; fprintf(stderr, "kvm version not supported\n"); goto err; } kvm_immediate_exit = kvm_check_extension(s, KVM_CAP_IMMEDIATE_EXIT); s->nr_slots = kvm_check_extension(s, KVM_CAP_NR_MEMSLOTS); /* If unspecified, use the default value */ if (!s->nr_slots) { s->nr_slots = 32; } /* check the vcpu limits */ soft_vcpus_limit = kvm_recommended_vcpus(s); hard_vcpus_limit = kvm_max_vcpus(s); while (nc->name) { if (nc->num > soft_vcpus_limit) { fprintf(stderr, "Warning: Number of %s cpus requested (%d) exceeds " "the recommended cpus supported by KVM (%d)\n", nc->name, nc->num, soft_vcpus_limit); if (nc->num > hard_vcpus_limit) { fprintf(stderr, "Number of %s cpus requested (%d) exceeds " "the maximum cpus supported by KVM (%d)\n", nc->name, nc->num, hard_vcpus_limit); exit(1); } } nc++; } kvm_type = qemu_opt_get(qemu_get_machine_opts(), "kvm-type"); if (mc->kvm_type) { type = mc->kvm_type(kvm_type); } else if (kvm_type) { ret = -EINVAL; fprintf(stderr, "Invalid argument kvm-type=%s\n", kvm_type); goto err; } do { ret = kvm_ioctl(s, KVM_CREATE_VM, type); } while (ret == -EINTR); if (ret < 0) { fprintf(stderr, "ioctl(KVM_CREATE_VM) failed: %d %s\n", -ret, strerror(-ret)); #ifdef TARGET_S390X if (ret == -EINVAL) { fprintf(stderr, "Host kernel setup problem detected. Please verify:\n"); fprintf(stderr, "- for kernels supporting the switch_amode or" " user_mode parameters, whether\n"); fprintf(stderr, " user space is running in primary address space\n"); fprintf(stderr, "- for kernels supporting the vm.allocate_pgste sysctl, " "whether it is enabled\n"); } #endif goto err; } s->vmfd = ret; missing_cap = kvm_check_extension_list(s, kvm_required_capabilites); if (!missing_cap) { missing_cap = kvm_check_extension_list(s, kvm_arch_required_capabilities); } if (missing_cap) { ret = -EINVAL; fprintf(stderr, "kvm does not support %s\n%s", missing_cap->name, upgrade_note); goto err; } s->coalesced_mmio = kvm_check_extension(s, KVM_CAP_COALESCED_MMIO); s->broken_set_mem_region = 1; ret = kvm_check_extension(s, KVM_CAP_JOIN_MEMORY_REGIONS_WORKS); if (ret > 0) { s->broken_set_mem_region = 0; } #ifdef KVM_CAP_VCPU_EVENTS s->vcpu_events = kvm_check_extension(s, KVM_CAP_VCPU_EVENTS); #endif s->robust_singlestep = kvm_check_extension(s, KVM_CAP_X86_ROBUST_SINGLESTEP); #ifdef KVM_CAP_DEBUGREGS s->debugregs = kvm_check_extension(s, KVM_CAP_DEBUGREGS); #endif #ifdef KVM_CAP_IRQ_ROUTING kvm_direct_msi_allowed = (kvm_check_extension(s, KVM_CAP_SIGNAL_MSI) > 0); #endif s->intx_set_mask = kvm_check_extension(s, KVM_CAP_PCI_2_3); s->irq_set_ioctl = KVM_IRQ_LINE; if (kvm_check_extension(s, KVM_CAP_IRQ_INJECT_STATUS)) { s->irq_set_ioctl = KVM_IRQ_LINE_STATUS; } #ifdef KVM_CAP_READONLY_MEM kvm_readonly_mem_allowed = (kvm_check_extension(s, KVM_CAP_READONLY_MEM) > 0); #endif kvm_eventfds_allowed = (kvm_check_extension(s, KVM_CAP_IOEVENTFD) > 0); kvm_irqfds_allowed = (kvm_check_extension(s, KVM_CAP_IRQFD) > 0); kvm_resamplefds_allowed = (kvm_check_extension(s, KVM_CAP_IRQFD_RESAMPLE) > 0); kvm_vm_attributes_allowed = (kvm_check_extension(s, KVM_CAP_VM_ATTRIBUTES) > 0); kvm_ioeventfd_any_length_allowed = (kvm_check_extension(s, KVM_CAP_IOEVENTFD_ANY_LENGTH) > 0); kvm_state = s; ret = kvm_arch_init(ms, s); if (ret < 0) { goto err; } if (machine_kernel_irqchip_allowed(ms)) { kvm_irqchip_create(ms, s); } if (kvm_eventfds_allowed) { s->memory_listener.listener.eventfd_add = kvm_mem_ioeventfd_add; s->memory_listener.listener.eventfd_del = kvm_mem_ioeventfd_del; } s->memory_listener.listener.coalesced_mmio_add = kvm_coalesce_mmio_region; s->memory_listener.listener.coalesced_mmio_del = kvm_uncoalesce_mmio_region; kvm_memory_listener_register(s, &s->memory_listener, &address_space_memory, 0); memory_listener_register(&kvm_io_listener, &address_space_io); s->many_ioeventfds = kvm_check_many_ioeventfds(); return 0; err: assert(ret < 0); if (s->vmfd >= 0) { close(s->vmfd); } if (s->fd != -1) { close(s->fd); } g_free(s->memory_listener.slots); return ret; } void kvm_set_sigmask_len(KVMState *s, unsigned int sigmask_len) { s->sigmask_len = sigmask_len; } static void kvm_handle_io(uint16_t port, MemTxAttrs attrs, void *data, int direction, int size, uint32_t count) { int i; uint8_t *ptr = data; for (i = 0; i < count; i++) { address_space_rw(&address_space_io, port, attrs, ptr, size, direction == KVM_EXIT_IO_OUT); ptr += size; } } static int kvm_handle_internal_error(CPUState *cpu, struct kvm_run *run) { fprintf(stderr, "KVM internal error. Suberror: %d\n", run->internal.suberror); if (kvm_check_extension(kvm_state, KVM_CAP_INTERNAL_ERROR_DATA)) { int i; for (i = 0; i < run->internal.ndata; ++i) { fprintf(stderr, "extra data[%d]: %"PRIx64"\n", i, (uint64_t)run->internal.data[i]); } } if (run->internal.suberror == KVM_INTERNAL_ERROR_EMULATION) { fprintf(stderr, "emulation failure\n"); if (!kvm_arch_stop_on_emulation_error(cpu)) { cpu_dump_state(cpu, stderr, fprintf, CPU_DUMP_CODE); return EXCP_INTERRUPT; } } /* FIXME: Should trigger a qmp message to let management know * something went wrong. */ return -1; } void kvm_flush_coalesced_mmio_buffer(void) { KVMState *s = kvm_state; if (s->coalesced_flush_in_progress) { return; } s->coalesced_flush_in_progress = true; if (s->coalesced_mmio_ring) { struct kvm_coalesced_mmio_ring *ring = s->coalesced_mmio_ring; while (ring->first != ring->last) { struct kvm_coalesced_mmio *ent; ent = &ring->coalesced_mmio[ring->first]; cpu_physical_memory_write(ent->phys_addr, ent->data, ent->len); smp_wmb(); ring->first = (ring->first + 1) % KVM_COALESCED_MMIO_MAX; } } s->coalesced_flush_in_progress = false; } static void do_kvm_cpu_synchronize_state(CPUState *cpu, run_on_cpu_data arg) { if (!cpu->vcpu_dirty) { kvm_arch_get_registers(cpu); cpu->vcpu_dirty = true; } } void kvm_cpu_synchronize_state(CPUState *cpu) { if (!cpu->vcpu_dirty) { run_on_cpu(cpu, do_kvm_cpu_synchronize_state, RUN_ON_CPU_NULL); } } static void do_kvm_cpu_synchronize_post_reset(CPUState *cpu, run_on_cpu_data arg) { kvm_arch_put_registers(cpu, KVM_PUT_RESET_STATE); cpu->vcpu_dirty = false; } void kvm_cpu_synchronize_post_reset(CPUState *cpu) { run_on_cpu(cpu, do_kvm_cpu_synchronize_post_reset, RUN_ON_CPU_NULL); } static void do_kvm_cpu_synchronize_post_init(CPUState *cpu, run_on_cpu_data arg) { kvm_arch_put_registers(cpu, KVM_PUT_FULL_STATE); cpu->vcpu_dirty = false; } void kvm_cpu_synchronize_post_init(CPUState *cpu) { run_on_cpu(cpu, do_kvm_cpu_synchronize_post_init, RUN_ON_CPU_NULL); } static void do_kvm_cpu_synchronize_pre_loadvm(CPUState *cpu, run_on_cpu_data arg) { cpu->vcpu_dirty = true; } void kvm_cpu_synchronize_pre_loadvm(CPUState *cpu) { run_on_cpu(cpu, do_kvm_cpu_synchronize_pre_loadvm, RUN_ON_CPU_NULL); } #ifdef KVM_HAVE_MCE_INJECTION static __thread void *pending_sigbus_addr; static __thread int pending_sigbus_code; static __thread bool have_sigbus_pending; #endif static void kvm_cpu_kick(CPUState *cpu) { atomic_set(&cpu->kvm_run->immediate_exit, 1); } static void kvm_cpu_kick_self(void) { if (kvm_immediate_exit) { kvm_cpu_kick(current_cpu); } else { qemu_cpu_kick_self(); } } static void kvm_eat_signals(CPUState *cpu) { struct timespec ts = { 0, 0 }; siginfo_t siginfo; sigset_t waitset; sigset_t chkset; int r; if (kvm_immediate_exit) { atomic_set(&cpu->kvm_run->immediate_exit, 0); /* Write kvm_run->immediate_exit before the cpu->exit_request * write in kvm_cpu_exec. */ smp_wmb(); return; } sigemptyset(&waitset); sigaddset(&waitset, SIG_IPI); do { r = sigtimedwait(&waitset, &siginfo, &ts); if (r == -1 && !(errno == EAGAIN || errno == EINTR)) { perror("sigtimedwait"); exit(1); } r = sigpending(&chkset); if (r == -1) { perror("sigpending"); exit(1); } } while (sigismember(&chkset, SIG_IPI)); } int kvm_cpu_exec(CPUState *cpu) { struct kvm_run *run = cpu->kvm_run; int ret, run_ret; DPRINTF("kvm_cpu_exec()\n"); if (kvm_arch_process_async_events(cpu)) { atomic_set(&cpu->exit_request, 0); return EXCP_HLT; } qemu_mutex_unlock_iothread(); cpu_exec_start(cpu); do { MemTxAttrs attrs; if (cpu->vcpu_dirty) { kvm_arch_put_registers(cpu, KVM_PUT_RUNTIME_STATE); cpu->vcpu_dirty = false; } kvm_arch_pre_run(cpu, run); if (atomic_read(&cpu->exit_request)) { DPRINTF("interrupt exit requested\n"); /* * KVM requires us to reenter the kernel after IO exits to complete * instruction emulation. This self-signal will ensure that we * leave ASAP again. */ kvm_cpu_kick_self(); } /* Read cpu->exit_request before KVM_RUN reads run->immediate_exit. * Matching barrier in kvm_eat_signals. */ smp_rmb(); run_ret = kvm_vcpu_ioctl(cpu, KVM_RUN, 0); attrs = kvm_arch_post_run(cpu, run); #ifdef KVM_HAVE_MCE_INJECTION if (unlikely(have_sigbus_pending)) { qemu_mutex_lock_iothread(); kvm_arch_on_sigbus_vcpu(cpu, pending_sigbus_code, pending_sigbus_addr); have_sigbus_pending = false; qemu_mutex_unlock_iothread(); } #endif if (run_ret < 0) { if (run_ret == -EINTR || run_ret == -EAGAIN) { DPRINTF("io window exit\n"); kvm_eat_signals(cpu); ret = EXCP_INTERRUPT; break; } fprintf(stderr, "error: kvm run failed %s\n", strerror(-run_ret)); #ifdef TARGET_PPC if (run_ret == -EBUSY) { fprintf(stderr, "This is probably because your SMT is enabled.\n" "VCPU can only run on primary threads with all " "secondary threads offline.\n"); } #endif ret = -1; break; } trace_kvm_run_exit(cpu->cpu_index, run->exit_reason); switch (run->exit_reason) { case KVM_EXIT_IO: DPRINTF("handle_io\n"); /* Called outside BQL */ kvm_handle_io(run->io.port, attrs, (uint8_t *)run + run->io.data_offset, run->io.direction, run->io.size, run->io.count); ret = 0; break; case KVM_EXIT_MMIO: DPRINTF("handle_mmio\n"); /* Called outside BQL */ address_space_rw(&address_space_memory, run->mmio.phys_addr, attrs, run->mmio.data, run->mmio.len, run->mmio.is_write); ret = 0; break; case KVM_EXIT_IRQ_WINDOW_OPEN: DPRINTF("irq_window_open\n"); ret = EXCP_INTERRUPT; break; case KVM_EXIT_SHUTDOWN: DPRINTF("shutdown\n"); qemu_system_reset_request(SHUTDOWN_CAUSE_GUEST_RESET); ret = EXCP_INTERRUPT; break; case KVM_EXIT_UNKNOWN: fprintf(stderr, "KVM: unknown exit, hardware reason %" PRIx64 "\n", (uint64_t)run->hw.hardware_exit_reason); ret = -1; break; case KVM_EXIT_INTERNAL_ERROR: ret = kvm_handle_internal_error(cpu, run); break; case KVM_EXIT_SYSTEM_EVENT: switch (run->system_event.type) { case KVM_SYSTEM_EVENT_SHUTDOWN: qemu_system_shutdown_request(SHUTDOWN_CAUSE_GUEST_SHUTDOWN); ret = EXCP_INTERRUPT; break; case KVM_SYSTEM_EVENT_RESET: qemu_system_reset_request(SHUTDOWN_CAUSE_GUEST_RESET); ret = EXCP_INTERRUPT; break; case KVM_SYSTEM_EVENT_CRASH: kvm_cpu_synchronize_state(cpu); qemu_mutex_lock_iothread(); qemu_system_guest_panicked(cpu_get_crash_info(cpu)); qemu_mutex_unlock_iothread(); ret = 0; break; default: DPRINTF("kvm_arch_handle_exit\n"); ret = kvm_arch_handle_exit(cpu, run); break; } break; default: DPRINTF("kvm_arch_handle_exit\n"); ret = kvm_arch_handle_exit(cpu, run); break; } } while (ret == 0); cpu_exec_end(cpu); qemu_mutex_lock_iothread(); if (ret < 0) { cpu_dump_state(cpu, stderr, fprintf, CPU_DUMP_CODE); vm_stop(RUN_STATE_INTERNAL_ERROR); } atomic_set(&cpu->exit_request, 0); return ret; } int kvm_ioctl(KVMState *s, int type, ...) { int ret; void *arg; va_list ap; va_start(ap, type); arg = va_arg(ap, void *); va_end(ap); trace_kvm_ioctl(type, arg); ret = ioctl(s->fd, type, arg); if (ret == -1) { ret = -errno; } return ret; } int kvm_vm_ioctl(KVMState *s, int type, ...) { int ret; void *arg; va_list ap; va_start(ap, type); arg = va_arg(ap, void *); va_end(ap); trace_kvm_vm_ioctl(type, arg); ret = ioctl(s->vmfd, type, arg); if (ret == -1) { ret = -errno; } return ret; } int kvm_vcpu_ioctl(CPUState *cpu, int type, ...) { int ret; void *arg; va_list ap; va_start(ap, type); arg = va_arg(ap, void *); va_end(ap); trace_kvm_vcpu_ioctl(cpu->cpu_index, type, arg); ret = ioctl(cpu->kvm_fd, type, arg); if (ret == -1) { ret = -errno; } return ret; } int kvm_device_ioctl(int fd, int type, ...) { int ret; void *arg; va_list ap; va_start(ap, type); arg = va_arg(ap, void *); va_end(ap); trace_kvm_device_ioctl(fd, type, arg); ret = ioctl(fd, type, arg); if (ret == -1) { ret = -errno; } return ret; } int kvm_vm_check_attr(KVMState *s, uint32_t group, uint64_t attr) { int ret; struct kvm_device_attr attribute = { .group = group, .attr = attr, }; if (!kvm_vm_attributes_allowed) { return 0; } ret = kvm_vm_ioctl(s, KVM_HAS_DEVICE_ATTR, &attribute); /* kvm returns 0 on success for HAS_DEVICE_ATTR */ return ret ? 0 : 1; } int kvm_device_check_attr(int dev_fd, uint32_t group, uint64_t attr) { struct kvm_device_attr attribute = { .group = group, .attr = attr, .flags = 0, }; return kvm_device_ioctl(dev_fd, KVM_HAS_DEVICE_ATTR, &attribute) ? 0 : 1; } int kvm_device_access(int fd, int group, uint64_t attr, void *val, bool write, Error **errp) { struct kvm_device_attr kvmattr; int err; kvmattr.flags = 0; kvmattr.group = group; kvmattr.attr = attr; kvmattr.addr = (uintptr_t)val; err = kvm_device_ioctl(fd, write ? KVM_SET_DEVICE_ATTR : KVM_GET_DEVICE_ATTR, &kvmattr); if (err < 0) { error_setg_errno(errp, -err, "KVM_%s_DEVICE_ATTR failed: Group %d " "attr 0x%016" PRIx64, write ? "SET" : "GET", group, attr); } return err; } /* Return 1 on success, 0 on failure */ int kvm_has_sync_mmu(void) { return kvm_check_extension(kvm_state, KVM_CAP_SYNC_MMU); } int kvm_has_vcpu_events(void) { return kvm_state->vcpu_events; } int kvm_has_robust_singlestep(void) { return kvm_state->robust_singlestep; } int kvm_has_debugregs(void) { return kvm_state->debugregs; } int kvm_has_many_ioeventfds(void) { if (!kvm_enabled()) { return 0; } return kvm_state->many_ioeventfds; } int kvm_has_gsi_routing(void) { #ifdef KVM_CAP_IRQ_ROUTING return kvm_check_extension(kvm_state, KVM_CAP_IRQ_ROUTING); #else return false; #endif } int kvm_has_intx_set_mask(void) { return kvm_state->intx_set_mask; } bool kvm_arm_supports_user_irq(void) { return kvm_check_extension(kvm_state, KVM_CAP_ARM_USER_IRQ); } #ifdef KVM_CAP_SET_GUEST_DEBUG struct kvm_sw_breakpoint *kvm_find_sw_breakpoint(CPUState *cpu, target_ulong pc) { struct kvm_sw_breakpoint *bp; QTAILQ_FOREACH(bp, &cpu->kvm_state->kvm_sw_breakpoints, entry) { if (bp->pc == pc) { return bp; } } return NULL; } int kvm_sw_breakpoints_active(CPUState *cpu) { return !QTAILQ_EMPTY(&cpu->kvm_state->kvm_sw_breakpoints); } struct kvm_set_guest_debug_data { struct kvm_guest_debug dbg; int err; }; static void kvm_invoke_set_guest_debug(CPUState *cpu, run_on_cpu_data data) { struct kvm_set_guest_debug_data *dbg_data = (struct kvm_set_guest_debug_data *) data.host_ptr; dbg_data->err = kvm_vcpu_ioctl(cpu, KVM_SET_GUEST_DEBUG, &dbg_data->dbg); } int kvm_update_guest_debug(CPUState *cpu, unsigned long reinject_trap) { struct kvm_set_guest_debug_data data; data.dbg.control = reinject_trap; if (cpu->singlestep_enabled) { data.dbg.control |= KVM_GUESTDBG_ENABLE | KVM_GUESTDBG_SINGLESTEP; } kvm_arch_update_guest_debug(cpu, &data.dbg); run_on_cpu(cpu, kvm_invoke_set_guest_debug, RUN_ON_CPU_HOST_PTR(&data)); return data.err; } int kvm_insert_breakpoint(CPUState *cpu, target_ulong addr, target_ulong len, int type) { struct kvm_sw_breakpoint *bp; int err; if (type == GDB_BREAKPOINT_SW) { bp = kvm_find_sw_breakpoint(cpu, addr); if (bp) { bp->use_count++; return 0; } bp = g_malloc(sizeof(struct kvm_sw_breakpoint)); bp->pc = addr; bp->use_count = 1; err = kvm_arch_insert_sw_breakpoint(cpu, bp); if (err) { g_free(bp); return err; } QTAILQ_INSERT_HEAD(&cpu->kvm_state->kvm_sw_breakpoints, bp, entry); } else { err = kvm_arch_insert_hw_breakpoint(addr, len, type); if (err) { return err; } } CPU_FOREACH(cpu) { err = kvm_update_guest_debug(cpu, 0); if (err) { return err; } } return 0; } int kvm_remove_breakpoint(CPUState *cpu, target_ulong addr, target_ulong len, int type) { struct kvm_sw_breakpoint *bp; int err; if (type == GDB_BREAKPOINT_SW) { bp = kvm_find_sw_breakpoint(cpu, addr); if (!bp) { return -ENOENT; } if (bp->use_count > 1) { bp->use_count--; return 0; } err = kvm_arch_remove_sw_breakpoint(cpu, bp); if (err) { return err; } QTAILQ_REMOVE(&cpu->kvm_state->kvm_sw_breakpoints, bp, entry); g_free(bp); } else { err = kvm_arch_remove_hw_breakpoint(addr, len, type); if (err) { return err; } } CPU_FOREACH(cpu) { err = kvm_update_guest_debug(cpu, 0); if (err) { return err; } } return 0; } void kvm_remove_all_breakpoints(CPUState *cpu) { struct kvm_sw_breakpoint *bp, *next; KVMState *s = cpu->kvm_state; CPUState *tmpcpu; QTAILQ_FOREACH_SAFE(bp, &s->kvm_sw_breakpoints, entry, next) { if (kvm_arch_remove_sw_breakpoint(cpu, bp) != 0) { /* Try harder to find a CPU that currently sees the breakpoint. */ CPU_FOREACH(tmpcpu) { if (kvm_arch_remove_sw_breakpoint(tmpcpu, bp) == 0) { break; } } } QTAILQ_REMOVE(&s->kvm_sw_breakpoints, bp, entry); g_free(bp); } kvm_arch_remove_all_hw_breakpoints(); CPU_FOREACH(cpu) { kvm_update_guest_debug(cpu, 0); } } #else /* !KVM_CAP_SET_GUEST_DEBUG */ int kvm_update_guest_debug(CPUState *cpu, unsigned long reinject_trap) { return -EINVAL; } int kvm_insert_breakpoint(CPUState *cpu, target_ulong addr, target_ulong len, int type) { return -EINVAL; } int kvm_remove_breakpoint(CPUState *cpu, target_ulong addr, target_ulong len, int type) { return -EINVAL; } void kvm_remove_all_breakpoints(CPUState *cpu) { } #endif /* !KVM_CAP_SET_GUEST_DEBUG */ static int kvm_set_signal_mask(CPUState *cpu, const sigset_t *sigset) { KVMState *s = kvm_state; struct kvm_signal_mask *sigmask; int r; sigmask = g_malloc(sizeof(*sigmask) + sizeof(*sigset)); sigmask->len = s->sigmask_len; memcpy(sigmask->sigset, sigset, sizeof(*sigset)); r = kvm_vcpu_ioctl(cpu, KVM_SET_SIGNAL_MASK, sigmask); g_free(sigmask); return r; } static void kvm_ipi_signal(int sig) { if (current_cpu) { assert(kvm_immediate_exit); kvm_cpu_kick(current_cpu); } } void kvm_init_cpu_signals(CPUState *cpu) { int r; sigset_t set; struct sigaction sigact; memset(&sigact, 0, sizeof(sigact)); sigact.sa_handler = kvm_ipi_signal; sigaction(SIG_IPI, &sigact, NULL); pthread_sigmask(SIG_BLOCK, NULL, &set); #if defined KVM_HAVE_MCE_INJECTION sigdelset(&set, SIGBUS); pthread_sigmask(SIG_SETMASK, &set, NULL); #endif sigdelset(&set, SIG_IPI); if (kvm_immediate_exit) { r = pthread_sigmask(SIG_SETMASK, &set, NULL); } else { r = kvm_set_signal_mask(cpu, &set); } if (r) { fprintf(stderr, "kvm_set_signal_mask: %s\n", strerror(-r)); exit(1); } } /* Called asynchronously in VCPU thread. */ int kvm_on_sigbus_vcpu(CPUState *cpu, int code, void *addr) { #ifdef KVM_HAVE_MCE_INJECTION if (have_sigbus_pending) { return 1; } have_sigbus_pending = true; pending_sigbus_addr = addr; pending_sigbus_code = code; atomic_set(&cpu->exit_request, 1); return 0; #else return 1; #endif } /* Called synchronously (via signalfd) in main thread. */ int kvm_on_sigbus(int code, void *addr) { #ifdef KVM_HAVE_MCE_INJECTION /* Action required MCE kills the process if SIGBUS is blocked. Because * that's what happens in the I/O thread, where we handle MCE via signalfd, * we can only get action optional here. */ assert(code != BUS_MCEERR_AR); kvm_arch_on_sigbus_vcpu(first_cpu, code, addr); return 0; #else return 1; #endif } int kvm_create_device(KVMState *s, uint64_t type, bool test) { int ret; struct kvm_create_device create_dev; create_dev.type = type; create_dev.fd = -1; create_dev.flags = test ? KVM_CREATE_DEVICE_TEST : 0; if (!kvm_check_extension(s, KVM_CAP_DEVICE_CTRL)) { return -ENOTSUP; } ret = kvm_vm_ioctl(s, KVM_CREATE_DEVICE, &create_dev); if (ret) { return ret; } return test ? 0 : create_dev.fd; } bool kvm_device_supported(int vmfd, uint64_t type) { struct kvm_create_device create_dev = { .type = type, .fd = -1, .flags = KVM_CREATE_DEVICE_TEST, }; if (ioctl(vmfd, KVM_CHECK_EXTENSION, KVM_CAP_DEVICE_CTRL) <= 0) { return false; } return (ioctl(vmfd, KVM_CREATE_DEVICE, &create_dev) >= 0); } int kvm_set_one_reg(CPUState *cs, uint64_t id, void *source) { struct kvm_one_reg reg; int r; reg.id = id; reg.addr = (uintptr_t) source; r = kvm_vcpu_ioctl(cs, KVM_SET_ONE_REG, ®); if (r) { trace_kvm_failed_reg_set(id, strerror(-r)); } return r; } int kvm_get_one_reg(CPUState *cs, uint64_t id, void *target) { struct kvm_one_reg reg; int r; reg.id = id; reg.addr = (uintptr_t) target; r = kvm_vcpu_ioctl(cs, KVM_GET_ONE_REG, ®); if (r) { trace_kvm_failed_reg_get(id, strerror(-r)); } return r; } static void kvm_accel_class_init(ObjectClass *oc, void *data) { AccelClass *ac = ACCEL_CLASS(oc); ac->name = "KVM"; ac->init_machine = kvm_init; ac->allowed = &kvm_allowed; } static const TypeInfo kvm_accel_type = { .name = TYPE_KVM_ACCEL, .parent = TYPE_ACCEL, .class_init = kvm_accel_class_init, .instance_size = sizeof(KVMState), }; static void kvm_type_init(void) { type_register_static(&kvm_accel_type); } type_init(kvm_type_init);