linux/arch/x86/kvm
Gleb Natapov d0d538b9d1 KVM: nVMX: fix shadow on EPT
72f857950f broke shadow on EPT. This patch reverts it and fixes PAE
on nEPT (which reverted commit fixed) in other way.

Shadow on EPT is now broken because while L1 builds shadow page table
for L2 (which is PAE while L2 is in real mode) it never loads L2's
GUEST_PDPTR[0-3].  They do not need to be loaded because without nested
virtualization HW does this during guest entry if EPT is disabled,
but in our case L0 emulates L2's vmentry while EPT is enables, so we
cannot rely on vmcs12->guest_pdptr[0-3] to contain up-to-date values
and need to re-read PDPTEs from L2 memory. This is what kvm_set_cr3()
is doing, but by clearing cache bits during L2 vmentry we drop values
that kvm_set_cr3() read from memory.

So why the same code does not work for PAE on nEPT? kvm_set_cr3()
reads pdptes into vcpu->arch.walk_mmu->pdptrs[]. walk_mmu points to
vcpu->arch.nested_mmu while nested guest is running, but ept_load_pdptrs()
uses vcpu->arch.mmu which contain incorrect values. Fix that by using
walk_mmu in ept_(load|save)_pdptrs.

Signed-off-by: Gleb Natapov <gleb@redhat.com>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Tested-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2013-10-10 11:39:57 +02:00
..
Kconfig kvm: Allow build-time configuration of KVM device assignment 2013-04-28 12:58:56 +03:00
Makefile KVM: get rid of $(addprefix ../../../virt/kvm/, ...) in Makefiles 2013-05-19 15:14:00 +03:00
cpuid.c kvm hypervisor : Add a hypercall to KVM hypervisor to support pv-ticketlocks 2013-08-26 12:47:09 +03:00
cpuid.h Merge tag 'kvm-3.8-1' of git://git.kernel.org/pub/scm/virt/kvm/kvm 2012-12-13 15:31:08 -08:00
emulate.c KVM: x86 emulator: emulate RETF imm 2013-09-17 12:51:35 +03:00
i8254.c KVM: Let ioapic know the irq line status 2013-04-15 23:20:34 -03:00
i8254.h KVM: fold kvm_pit_timer into kvm_kpit_state 2012-08-01 00:21:07 -03:00
i8259.c KVM: inject ExtINT interrupt before APIC interrupts 2012-12-13 23:05:21 -02:00
irq.c x86, apicv: add virtual interrupt delivery support 2013-01-29 10:48:19 +02:00
irq.h KVM: switch to symbolic name for irq_states size 2012-07-20 16:12:16 -03:00
kvm_cache_regs.h KVM: MMU: Do not unconditionally read PDPTE from guest memory 2011-09-25 19:18:01 +03:00
lapic.c kvm hypervisor: Simplify kvm_for_each_vcpu with kvm_irq_delivery_to_apic 2013-08-26 12:47:09 +03:00
lapic.h KVM: Fix RTC interrupt coalescing tracking 2013-06-27 14:20:53 +03:00
mmu.c shrinker: convert remaining shrinkers to count/scan API 2013-09-10 18:56:32 -04:00
mmu.h nEPT: MMU context for nested EPT 2013-08-07 15:57:41 +02:00
mmu_audit.c KVM: do not release the error pfn 2012-08-06 16:04:57 +03:00
mmutrace.h KVM: MMU: add tracepoint for check_mmio_spte 2013-06-27 14:20:37 +03:00
paging_tmpl.h KVM: mmu: allow page tables to be in read-only slots 2013-09-17 12:52:31 +03:00
pmu.c perf, kvm: Support the in_tx/in_tx_cp modifiers in KVM arch perfmon emulation v5 2013-07-19 18:24:45 +02:00
svm.c kvm: Add a tracepoint write_tsc_offset 2013-06-27 14:20:51 +03:00
trace.h kvm: Add a tracepoint write_tsc_offset 2013-06-27 14:20:51 +03:00
tss.h KVM: x86: hardware task switching support 2008-04-27 12:00:39 +03:00
vmx.c KVM: nVMX: fix shadow on EPT 2013-10-10 11:39:57 +02:00
x86.c KVM: x86: update masterclock when kvmclock_offset is calculated (v2) 2013-08-28 17:36:11 +03:00
x86.h KVM: x86: Add code to track call origin for msr assignment 2012-11-30 18:26:12 -02:00