KVM: Allow adjust_tsc_offset to be in host or guest cycles

Redefine the API to take a parameter indicating whether an
adjustment is in host or guest cycles.

Signed-off-by: Zachary Amsden <zamsden@gmail.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>

1 files changed, 5 insertions, 1 deletions

diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index e12026e5244e..0b7690ee20bd 100644
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -1016,10 +1016,14 @@ static void svm_write_tsc_offset(struct kvm_vcpu *vcpu, u64 offset)
         mark_dirty(svm->vmcb, VMCB_INTERCEPTS);
 }
 
-static void svm_adjust_tsc_offset(struct kvm_vcpu *vcpu, s64 adjustment)
+static void svm_adjust_tsc_offset(struct kvm_vcpu *vcpu, s64 adjustment, bool host)
 {
         struct vcpu_svm *svm = to_svm(vcpu);
 
+        WARN_ON(adjustment < 0);
+        if (host)
+                adjustment = svm_scale_tsc(vcpu, adjustment);
+
         svm->vmcb->control.tsc_offset += adjustment;
         if (is_guest_mode(vcpu))
                 svm->nested.hsave->control.tsc_offset += adjustment;