Certain functions called during the emulated world switch behave differently when the vcpu is running nested. This is not the expected behavior during a world switch emulation. This patch ensures that the nested state is activated only if the vcpu is completly in nested state.
Signed-off-by: Joerg Roedel <[email protected]> --- arch/x86/kvm/svm.c | 15 +++++++++------ 1 files changed, 9 insertions(+), 6 deletions(-) diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c index d7b75fb..4e8d42b 100644 --- a/arch/x86/kvm/svm.c +++ b/arch/x86/kvm/svm.c @@ -1628,6 +1628,9 @@ static int nested_svm_vmexit(struct vcpu_svm *svm) if (!nested_vmcb) return 1; + /* Exit nested SVM mode */ + svm->nested.vmcb = 0; + /* Give the current vmcb to the guest */ disable_gif(svm); @@ -1715,9 +1718,6 @@ static int nested_svm_vmexit(struct vcpu_svm *svm) svm->vmcb->save.cpl = 0; svm->vmcb->control.exit_int_info = 0; - /* Exit nested SVM mode */ - svm->nested.vmcb = 0; - nested_svm_unmap(page); kvm_mmu_reset_context(&svm->vcpu); @@ -1752,14 +1752,14 @@ static bool nested_svm_vmrun(struct vcpu_svm *svm) struct vmcb *hsave = svm->nested.hsave; struct vmcb *vmcb = svm->vmcb; struct page *page; + u64 vmcb_gpa; + + vmcb_gpa = svm->vmcb->save.rax; nested_vmcb = nested_svm_map(svm, svm->vmcb->save.rax, &page); if (!nested_vmcb) return false; - /* nested_vmcb is our indicator if nested SVM is activated */ - svm->nested.vmcb = svm->vmcb->save.rax; - trace_kvm_nested_vmrun(svm->vmcb->save.rip - 3, svm->nested.vmcb, nested_vmcb->save.rip, nested_vmcb->control.int_ctl, @@ -1874,6 +1874,9 @@ static bool nested_svm_vmrun(struct vcpu_svm *svm) nested_svm_unmap(page); + /* nested_vmcb is our indicator if nested SVM is activated */ + svm->nested.vmcb = vmcb_gpa; + enable_gif(svm); return true; -- 1.6.6 -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
