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KVM: SVM: add wrappers to enable/disable IRET interception

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SEV-ES guests don't use IRET interception for the detection of
an end of a NMI.

Therefore it makes sense to create a wrapper to avoid repeating
the check for the SEV-ES.

No functional change is intended.

Suggested-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: Maxim Levitsky <mlevitsk@redhat.com>
[Renamed iret intercept API of style svm_{clr,set}_iret_intercept()]
Signed-off-by: Santosh Shukla <Santosh.Shukla@amd.com>
Link: https://lore.kernel.org/r/20230227084016.3368-5-santosh.shukla@amd.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
This commit is contained in:
Maxim Levitsky
2023-02-27 14:10:09 +05:30
committed by Sean Christopherson
parent 5d1ec45652
commit 772f254d4d
1 changed files with 19 additions and 9 deletions
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arch/x86/kvm/svm/svm.c
+19 -9
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@@ -2490,16 +2490,29 @@ static int task_switch_interception(struct kvm_vcpu *vcpu)
has_error_code, error_code);
}
static void svm_clr_iret_intercept(struct vcpu_svm *svm)
{
if (!sev_es_guest(svm->vcpu.kvm))
svm_clr_intercept(svm, INTERCEPT_IRET);
}
static void svm_set_iret_intercept(struct vcpu_svm *svm)
{
if (!sev_es_guest(svm->vcpu.kvm))
svm_set_intercept(svm, INTERCEPT_IRET);
}
static int iret_interception(struct kvm_vcpu *vcpu)
{
struct vcpu_svm *svm = to_svm(vcpu);
++vcpu->stat.nmi_window_exits;
svm->awaiting_iret_completion = true;
if (!sev_es_guest(vcpu->kvm)) {
svm_clr_intercept(svm, INTERCEPT_IRET);
svm_clr_iret_intercept(svm);
if (!sev_es_guest(vcpu->kvm))
svm->nmi_iret_rip = kvm_rip_read(vcpu);
}
kvm_make_request(KVM_REQ_EVENT, vcpu);
return 1;
}
@@ -3508,8 +3521,7 @@ static void svm_inject_nmi(struct kvm_vcpu *vcpu)
return;
svm->nmi_masked = true;
if (!sev_es_guest(vcpu->kvm))
svm_set_intercept(svm, INTERCEPT_IRET);
svm_set_iret_intercept(svm);
++vcpu->stat.nmi_injections;
}
@@ -3649,12 +3661,10 @@ static void svm_set_nmi_mask(struct kvm_vcpu *vcpu, bool masked)
if (masked) {
svm->nmi_masked = true;
if (!sev_es_guest(vcpu->kvm))
svm_set_intercept(svm, INTERCEPT_IRET);
svm_set_iret_intercept(svm);
} else {
svm->nmi_masked = false;
if (!sev_es_guest(vcpu->kvm))
svm_clr_intercept(svm, INTERCEPT_IRET);
svm_clr_iret_intercept(svm);
}
}