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KVM: x86: Move TSC reset out of vmcb_init

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commit 47008cd887 upstream.

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Zachary Amsden
2010-10-28 16:48:15 -02:00
committed by Greg Kroah-Hartman
parent 60977a7ab5
commit 69b54926aa
1 changed files with 1 additions and 1 deletions
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2
arch/x86/kvm/svm.c
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@@ -621,7 +621,6 @@ 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);
@@ -754,6 +753,7 @@ 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();
fx_init(&svm->vcpu);
svm->vcpu.fpu_active = 1;