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From: Paolo Bonzini <pbonzini@redhat.com>
To: linux-kernel@vger.kernel.org, kvm@vger.kernel.org
Cc: rkrcmar@redhat.com, rkagan@virtuozzo.com, dplotnikov@virtuozzo.com
Subject: [PATCH 2/6] KVM: lapic: do not set KVM_REQ_EVENT unnecessarily on EOI
Date: Mon, 19 Dec 2016 10:47:14 +0100	[thread overview]
Message-ID: <1482140838-6303-3-git-send-email-pbonzini@redhat.com> (raw)
In-Reply-To: <1482140838-6303-1-git-send-email-pbonzini@redhat.com>

On EOI, there is no need to set KVM_REQ_EVENT unconditionally.  The PPR
update is already setting it if resetting the ISR bit causes PPR to
decrease.  Even a level-triggered IOAPIC interrupt will set KVM_REQ_EVENT
on a reinjection (ioapic_service -> kvm_irq_delivery_to_apic and from
there to __apic_accept_irq).

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
 arch/x86/kvm/lapic.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/arch/x86/kvm/lapic.c b/arch/x86/kvm/lapic.c
index e35cbd44c505..70c7428b7a57 100644
--- a/arch/x86/kvm/lapic.c
+++ b/arch/x86/kvm/lapic.c
@@ -1066,7 +1066,6 @@ static int apic_set_eoi(struct kvm_lapic *apic)
 		kvm_hv_synic_send_eoi(apic->vcpu, vector);
 
 	kvm_ioapic_send_eoi(apic, vector);
-	kvm_make_request(KVM_REQ_EVENT, apic->vcpu);
 	return vector;
 }
 
@@ -1081,7 +1080,6 @@ void kvm_apic_set_eoi_accelerated(struct kvm_vcpu *vcpu, int vector)
 	trace_kvm_eoi(apic, vector);
 
 	kvm_ioapic_send_eoi(apic, vector);
-	kvm_make_request(KVM_REQ_EVENT, apic->vcpu);
 }
 EXPORT_SYMBOL_GPL(kvm_apic_set_eoi_accelerated);
 
-- 
1.8.3.1

  parent reply	other threads:[~2016-12-19  9:51 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-12-19  9:47 [RFC PATCH v3 0/6] KVM: x86: avoid redundant REQ_EVENT Paolo Bonzini
2016-12-19  9:47 ` [PATCH 1/6] KVM: x86: add VCPU stat for KVM_REQ_EVENT processing Paolo Bonzini
     [not found]   ` <20161220092101.GE2081@rkaganb.sw.ru>
2016-12-20  9:32     ` Paolo Bonzini
2016-12-19  9:47 ` Paolo Bonzini [this message]
2016-12-23 12:08   ` [PATCH 2/6] KVM: lapic: do not set KVM_REQ_EVENT unnecessarily on EOI Paolo Bonzini
2016-12-19  9:47 ` [PATCH 3/6] KVM: vmx: speed up TPR below threshold vmexits Paolo Bonzini
2016-12-19  9:47 ` [PATCH 4/6] KVM: lapic: avoid unnecessary KVM_REQ_EVENT on IRR scan Paolo Bonzini
2016-12-19  9:47 ` [PATCH 5/6] KVM: lapic: do not set KVM_REQ_EVENT unnecessarily on PPR update Paolo Bonzini
2016-12-19  9:47 ` [PATCH 6/6] KVM: lapic: do not scan IRR when delivering an interrupt Paolo Bonzini
2016-12-20 17:11   ` Paolo Bonzini
2016-12-19 13:05 ` [RFC PATCH v3 0/6] KVM: x86: avoid redundant REQ_EVENT Denis Plotnikov
2016-12-19 14:30   ` Paolo Bonzini
2016-12-20 10:01     ` Roman Kagan

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