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KVM: x86: Move TSC reset out of vmcb_init

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The VMCB is reset whenever we receive a startup IPI, so Linux is setting
TSC back to zero happens very late in the boot process and destabilizing
the TSC.  Instead, just set TSC to zero once at VCPU creation time.

Why the separate patch?  So git-bisect is your friend.

Signed-off-by: Zachary Amsden <zamsden@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
This commit is contained in:
Zachary Amsden 2010-08-19 22:07:19 -10:00 • committed by Avi Kivity
parent 58877679fd
commit 47008cd887
1 changed files with 1 additions and 1 deletions
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2
arch/x86/kvm/svm.c
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@ -766,7 +766,6 @@ static void init_vmcb(struct vcpu_svm *svm)
control->iopm_base_pa = iopm_base;
control->msrpm_base_pa = __pa(svm->msrpm);
control->tsc_offset = 0-native_read_tsc();
control->int_ctl = V_INTR_MASKING_MASK;
init_seg(&save->es);
@ -902,6 +901,7 @@ static struct kvm_vcpu *svm_create_vcpu(struct kvm *kvm, unsigned int id)
svm->vmcb_pa = page_to_pfn(page) << PAGE_SHIFT;
svm->asid_generation = 0;
init_vmcb(svm);
svm->vmcb->control.tsc_offset = 0-native_read_tsc();
err = fx_init(&svm->vcpu);
if (err)