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kvm: svm: move WARN_ON in svm_adjust_tsc_offset

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When running the tsc_adjust kvm-unit-test on an AMD processor with the
IA32_TSC_ADJUST feature enabled, the WARN_ON in svm_adjust_tsc_offset can be
triggered. This WARN_ON checks for a negative adjustment in case __scale_tsc
is called; however it may trigger unnecessary warnings.

This patch moves the WARN_ON to trigger only if __scale_tsc will actually be
called from svm_adjust_tsc_offset. In addition make adj in kvm_set_msr_common
s64 since this can have signed values.

Signed-off-by: Chris J Arges <chris.j.arges@canonical.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Chris J Arges
2014-11-12 21:00:39 -06:00
committed by Paolo Bonzini
parent 54b98bff8e
commit d913b90435
2 changed files with 6 additions and 4 deletions
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8
arch/x86/kvm/svm.c
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@@ -1056,9 +1056,11 @@ static void svm_adjust_tsc_offset(struct kvm_vcpu *vcpu, s64 adjustment, bool ho
{
struct vcpu_svm *svm = to_svm(vcpu);
WARN_ON(adjustment < 0);
if (host)
adjustment = svm_scale_tsc(vcpu, adjustment);
if (host) {
if (svm->tsc_ratio != TSC_RATIO_DEFAULT)
WARN_ON(adjustment < 0);
adjustment = svm_scale_tsc(vcpu, (u64)adjustment);
}
svm->vmcb->control.tsc_offset += adjustment;
if (is_guest_mode(vcpu))