linux-kernel - [PATCH v3 4/7] KVM: x86: lapic does not have to process INIT if it is blocked

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Date:   Mon, 22 Aug 2022 13:06:56 -0400
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Cc:     mlevitsk@...hat.com, seanjc@...gle.com
Subject: [PATCH v3 4/7] KVM: x86: lapic does not have to process INIT if it is blocked

Do not return true from kvm_apic_has_events, and consequently from
kvm_vcpu_has_events, if the vCPU is not going to process an INIT.

Signed-off-by: Paolo Bonzini <pbonzini@...hat.com>
---
 arch/x86/include/asm/kvm_host.h | 1 +
 arch/x86/kvm/i8259.c            | 4 ++--
 arch/x86/kvm/lapic.h            | 2 +-
 arch/x86/kvm/x86.c              | 5 +++++
 arch/x86/kvm/x86.h              | 5 -----
 5 files changed, 9 insertions(+), 8 deletions(-)

diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index f57ff10c3ae8..bf23cd9dea79 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -2042,6 +2042,7 @@ void __user *__x86_set_memory_region(struct kvm *kvm, int id, gpa_t gpa,
 				     u32 size);
 bool kvm_vcpu_is_reset_bsp(struct kvm_vcpu *vcpu);
 bool kvm_vcpu_is_bsp(struct kvm_vcpu *vcpu);
+bool kvm_vcpu_latch_init(struct kvm_vcpu *vcpu);
 
 bool kvm_intr_is_single_vcpu(struct kvm *kvm, struct kvm_lapic_irq *irq,
 			     struct kvm_vcpu **dest_vcpu);
diff --git a/arch/x86/kvm/i8259.c b/arch/x86/kvm/i8259.c
index e1bb6218bb96..619520322533 100644
--- a/arch/x86/kvm/i8259.c
+++ b/arch/x86/kvm/i8259.c
@@ -29,9 +29,9 @@
 #include <linux/mm.h>
 #include <linux/slab.h>
 #include <linux/bitops.h>
-#include "irq.h"
-
 #include <linux/kvm_host.h>
+
+#include "irq.h"
 #include "trace.h"
 
 #define pr_pic_unimpl(fmt, ...)	\
diff --git a/arch/x86/kvm/lapic.h b/arch/x86/kvm/lapic.h
index 117a46df5cc1..12577ddccdfc 100644
--- a/arch/x86/kvm/lapic.h
+++ b/arch/x86/kvm/lapic.h
@@ -225,7 +225,7 @@ static inline bool kvm_vcpu_apicv_active(struct kvm_vcpu *vcpu)
 
 static inline bool kvm_apic_has_events(struct kvm_vcpu *vcpu)
 {
-	return lapic_in_kernel(vcpu) && vcpu->arch.apic->pending_events;
+	return lapic_in_kernel(vcpu) && vcpu->arch.apic->pending_events && !kvm_vcpu_latch_init(vcpu);
 }
 
 static inline bool kvm_lowest_prio_delivery(struct kvm_lapic_irq *irq)
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 95035c029def..5c5341110876 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -12572,6 +12572,11 @@ static inline bool kvm_guest_apic_has_interrupt(struct kvm_vcpu *vcpu)
 		static_call(kvm_x86_guest_apic_has_interrupt)(vcpu));
 }
 
+bool kvm_vcpu_latch_init(struct kvm_vcpu *vcpu)
+{
+	return is_smm(vcpu) || static_call(kvm_x86_apic_init_signal_blocked)(vcpu);
+}
+
 static inline bool kvm_vcpu_has_events(struct kvm_vcpu *vcpu)
 {
 	if (!list_empty_careful(&vcpu->async_pf.done))
diff --git a/arch/x86/kvm/x86.h b/arch/x86/kvm/x86.h
index 1926d2cb8e79..c333e7cf933a 100644
--- a/arch/x86/kvm/x86.h
+++ b/arch/x86/kvm/x86.h
@@ -267,11 +267,6 @@ static inline bool kvm_check_has_quirk(struct kvm *kvm, u64 quirk)
 	return !(kvm->arch.disabled_quirks & quirk);
 }
 
-static inline bool kvm_vcpu_latch_init(struct kvm_vcpu *vcpu)
-{
-	return is_smm(vcpu) || static_call(kvm_x86_apic_init_signal_blocked)(vcpu);
-}
-
 void kvm_inject_realmode_interrupt(struct kvm_vcpu *vcpu, int irq, int inc_eip);
 
 u64 get_kvmclock_ns(struct kvm *kvm);
-- 
2.31.1