linux-kernel - [PATCHv2 5/7] KVM: SVM: Add VNMI support in inject

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Date:   Sat, 9 Jul 2022 19:12:28 +0530
From:   Santosh Shukla <santosh.shukla@....com>
To:     Paolo Bonzini <pbonzini@...hat.com>
CC:     Sean Christopherson <seanjc@...gle.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>,
        Maxim Levitsky <mlevitsk@...hat.com>,
        Tom Lendacky <thomas.lendacky@....com>, <kvm@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <Santosh.Shukla@....com>
Subject: [PATCHv2 5/7] KVM: SVM: Add VNMI support in inject_nmi

Inject the NMI by setting V_NMI in the VMCB interrupt control. processor
will clear V_NMI to acknowledge processing has started and will keep the
V_NMI_MASK set until the processor is done with processing the NMI event.

Signed-off-by: Santosh Shukla <santosh.shukla@....com>
---
v2:
- Added WARN_ON check for vnmi pending.
- use `get_vnmi_vmcb` to get correct vmcb so to inject vnmi.

 arch/x86/kvm/svm/svm.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c
index 44c1f2317b45..c73a1809a7c7 100644
--- a/arch/x86/kvm/svm/svm.c
+++ b/arch/x86/kvm/svm/svm.c
@@ -3375,12 +3375,20 @@ static void pre_svm_run(struct kvm_vcpu *vcpu)
 static void svm_inject_nmi(struct kvm_vcpu *vcpu)
 {
 	struct vcpu_svm *svm = to_svm(vcpu);
+	struct vmcb *vmcb = NULL;
+
+	++vcpu->stat.nmi_injections;
+	if (is_vnmi_enabled(svm)) {
+		vmcb = get_vnmi_vmcb(svm);
+		WARN_ON(vmcb->control.int_ctl & V_NMI_PENDING);
+		vmcb->control.int_ctl |= V_NMI_PENDING;
+		return;
+	}
 
 	svm->vmcb->control.event_inj = SVM_EVTINJ_VALID | SVM_EVTINJ_TYPE_NMI;
 	vcpu->arch.hflags |= HF_NMI_MASK;
 	if (!sev_es_guest(vcpu->kvm))
 		svm_set_intercept(svm, INTERCEPT_IRET);
-	++vcpu->stat.nmi_injections;
 }
 
 static void svm_inject_irq(struct kvm_vcpu *vcpu)
-- 
2.25.1