linux-kernel - [PATCH v4 05/12] KVM: x86: lapic does not have to process INIT if it is blocked

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Date:   Wed, 21 Sep 2022 00:31:54 +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 05/12] KVM: x86: lapic does not have to process INIT if it
 is blocked

From: Paolo Bonzini <pbonzini@...hat.com>

Do not return true from kvm_vcpu_has_events() if the vCPU isn' going to
immediately process a pending INIT/SIPI.  INIT/SIPI shouldn't be treated
as wake events if they are blocked.

Signed-off-by: Paolo Bonzini <pbonzini@...hat.com>
[sean: rebase onto refactored INIT/SIPI helpers, massage changelog]
Signed-off-by: Sean Christopherson <seanjc@...gle.com>
---
 arch/x86/kvm/x86.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 16a24dd28f26..dcc675d4e44b 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -12765,7 +12765,8 @@ static inline bool kvm_vcpu_has_events(struct kvm_vcpu *vcpu)
 	if (!list_empty_careful(&vcpu->async_pf.done))
 		return true;
 
-	if (kvm_apic_has_pending_init_or_sipi(vcpu))
+	if (kvm_apic_has_pending_init_or_sipi(vcpu) &&
+	    kvm_apic_init_sipi_allowed(vcpu))
 		return true;
 
 	if (vcpu->arch.pv.pv_unhalted)
-- 
2.37.3.968.ga6b4b080e4-goog