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From: Joerg Roedel on 24 Feb 2010 13:00
Without resetting the MMU the gva_to_pga function will not
work reliably when the vcpu is running in nested context.

Signed-off-by: Joerg Roedel <joerg.roedel(a)amd.com>
---
arch/x86/kvm/svm.c | 8 +++++---
1 files changed, 5 insertions(+), 3 deletions(-)

diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index 217b8b0..b821b2f 100644
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -1871,10 +1871,12 @@ static bool nested_svm_vmrun(struct vcpu_svm *svm)
if (npt_enabled) {
svm->vmcb->save.cr3 = nested_vmcb->save.cr3;
svm->vcpu.arch.cr3 = nested_vmcb->save.cr3;
- } else {
+ } else
kvm_set_cr3(&svm->vcpu, nested_vmcb->save.cr3);
- kvm_mmu_reset_context(&svm->vcpu);
- }
+
+ /* Guest paging mode is active - reset mmu */
+ kvm_mmu_reset_context(&svm->vcpu);
+
svm->vmcb->save.cr2 = svm->vcpu.arch.cr2 = nested_vmcb->save.cr2;
kvm_register_write(&svm->vcpu, VCPU_REGS_RAX, nested_vmcb->save.rax);
kvm_register_write(&svm->vcpu, VCPU_REGS_RSP, nested_vmcb->save.rsp);
--
1.7.0


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Prev: introduce sys_membarrier(): process-wide memory barrier (v9)
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