linux-kernel - [PATCH v4 08/12] KVM: nVMX: Make event request on VMXOFF iff INIT/SIPI is pending

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Date:   Wed, 21 Sep 2022 00:31:57 +0000
From:   Sean Christopherson <seanjc@...gle.com>
To:     Paolo Bonzini <pbonzini@...hat.com>, Marc Zyngier <maz@...nel.org>,
        Huacai Chen <chenhuacai@...nel.org>,
        Aleksandar Markovic <aleksandar.qemu.devel@...il.com>,
        Anup Patel <anup@...infault.org>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Christian Borntraeger <borntraeger@...ux.ibm.com>,
        Janosch Frank <frankja@...ux.ibm.com>,
        Claudio Imbrenda <imbrenda@...ux.ibm.com>,
        Sean Christopherson <seanjc@...gle.com>
Cc:     James Morse <james.morse@....com>,
        Alexandru Elisei <alexandru.elisei@....com>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        Oliver Upton <oliver.upton@...ux.dev>,
        Atish Patra <atishp@...shpatra.org>,
        David Hildenbrand <david@...hat.com>, kvm@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.cs.columbia.edu,
        linux-mips@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        kvm-riscv@...ts.infradead.org, linux-riscv@...ts.infradead.org,
        linux-kernel@...r.kernel.org, Maxim Levitsky <mlevitsk@...hat.com>
Subject: [PATCH v4 08/12] KVM: nVMX: Make event request on VMXOFF iff
 INIT/SIPI is pending

Explicitly check for a pending INIT/SIPI event when emulating VMXOFF
instead of blindly making an event request.  There's obviously no need
to evaluate events if none are pending.

Signed-off-by: Sean Christopherson <seanjc@...gle.com>
---
 arch/x86/kvm/vmx/nested.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/x86/kvm/vmx/nested.c b/arch/x86/kvm/vmx/nested.c
index 5922531f6c52..8f67a9c4a287 100644
--- a/arch/x86/kvm/vmx/nested.c
+++ b/arch/x86/kvm/vmx/nested.c
@@ -5193,8 +5193,8 @@ static int handle_vmxoff(struct kvm_vcpu *vcpu)
 
 	free_nested(vcpu);
 
-	/* Process a latched INIT during time CPU was in VMX operation */
-	kvm_make_request(KVM_REQ_EVENT, vcpu);
+	if (kvm_apic_has_pending_init_or_sipi(vcpu))
+		kvm_make_request(KVM_REQ_EVENT, vcpu);
 
 	return nested_vmx_succeed(vcpu);
 }
-- 
2.37.3.968.ga6b4b080e4-goog