From: Nadav Har'El Date: Tue, 2 Aug 2011 12:55:23 +0000 (+0300) Subject: KVM: SVM: Fix TSC MSR read in nested SVM X-Git-Tag: v3.12-rc1~4589^2~52 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=45133ecaaec7aea447afc98cc2c24aac638bbe5c;p=kernel%2Fkernel-generic.git KVM: SVM: Fix TSC MSR read in nested SVM When the TSC MSR is read by an L2 guest (when L1 allowed this MSR to be read without exit), we need to return L2's notion of the TSC, not L1's. The current code incorrectly returned L1 TSC, because svm_get_msr() was also used in x86.c where this was assumed, but now that these places call the new svm_read_l1_tsc(), the MSR read can be fixed. Signed-off-by: Nadav Har'El Tested-by: Joerg Roedel Acked-by: Joerg Roedel Signed-off-by: Avi Kivity --- diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c index 590d1d2..8277f32 100644 --- a/arch/x86/kvm/svm.c +++ b/arch/x86/kvm/svm.c @@ -2923,9 +2923,7 @@ static int svm_get_msr(struct kvm_vcpu *vcpu, unsigned ecx, u64 *data) switch (ecx) { case MSR_IA32_TSC: { - struct vmcb *vmcb = get_host_vmcb(svm); - - *data = vmcb->control.tsc_offset + + *data = svm->vmcb->control.tsc_offset + svm_scale_tsc(vcpu, native_read_tsc()); break;