From: Christoffer Dall <christoffer.dall@arm.com> To: Andre Przywara <andre.przywara@arm.com> Cc: Marc Zyngier <marc.zyngier@arm.com>, Stefano Stabellini <sstabellini@kernel.org>, kvmarm@lists.cs.columbia.edu, kvm@vger.kernel.org, linux-arm-kernel@lists.infradead.org Subject: Re: [PATCH] KVM: arm/arm64: VGIC: Kick new VCPU on interrupt migration Date: Tue, 17 Apr 2018 13:32:20 +0200 [thread overview] Message-ID: <20180417113220.GA66827@C02W217FHV2R.local> (raw) In-Reply-To: <20180417102349.3039-1-andre.przywara@arm.com> On Tue, Apr 17, 2018 at 11:23:49AM +0100, Andre Przywara wrote: > When vgic_prune_ap_list() finds an interrupt that needs to be migrated > to a new VCPU, we should notify this VCPU of the pending interrupt, > since it requires immediate action. > Kick this VCPU once we have added the new IRQ to the list, but only > after dropping the locks. > > Reported-by: Stefano Stabellini <sstabellini@kernel.org> > Signed-off-by: Andre Przywara <andre.przywara@arm.com> Reviewed-by: Christoffer Dall <christoffer.dall@arm.com> > --- > virt/kvm/arm/vgic/vgic.c | 8 ++++++++ > 1 file changed, 8 insertions(+) > > diff --git a/virt/kvm/arm/vgic/vgic.c b/virt/kvm/arm/vgic/vgic.c > index e74baec76361..4b6d72939c42 100644 > --- a/virt/kvm/arm/vgic/vgic.c > +++ b/virt/kvm/arm/vgic/vgic.c > @@ -594,6 +594,7 @@ static void vgic_prune_ap_list(struct kvm_vcpu *vcpu) > > list_for_each_entry_safe(irq, tmp, &vgic_cpu->ap_list_head, ap_list) { > struct kvm_vcpu *target_vcpu, *vcpuA, *vcpuB; > + bool target_vcpu_needs_kick = false; > > spin_lock(&irq->irq_lock); > > @@ -664,11 +665,18 @@ static void vgic_prune_ap_list(struct kvm_vcpu *vcpu) > list_del(&irq->ap_list); > irq->vcpu = target_vcpu; > list_add_tail(&irq->ap_list, &new_cpu->ap_list_head); > + target_vcpu_needs_kick = true; > } > > spin_unlock(&irq->irq_lock); > spin_unlock(&vcpuB->arch.vgic_cpu.ap_list_lock); > spin_unlock_irqrestore(&vcpuA->arch.vgic_cpu.ap_list_lock, flags); > + > + if (target_vcpu_needs_kick) { > + kvm_make_request(KVM_REQ_IRQ_PENDING, target_vcpu); > + kvm_vcpu_kick(target_vcpu); > + } > + > goto retry; > } > > -- > 2.14.1 >
WARNING: multiple messages have this Message-ID (diff)
From: christoffer.dall@arm.com (Christoffer Dall) To: linux-arm-kernel@lists.infradead.org Subject: [PATCH] KVM: arm/arm64: VGIC: Kick new VCPU on interrupt migration Date: Tue, 17 Apr 2018 13:32:20 +0200 [thread overview] Message-ID: <20180417113220.GA66827@C02W217FHV2R.local> (raw) In-Reply-To: <20180417102349.3039-1-andre.przywara@arm.com> On Tue, Apr 17, 2018 at 11:23:49AM +0100, Andre Przywara wrote: > When vgic_prune_ap_list() finds an interrupt that needs to be migrated > to a new VCPU, we should notify this VCPU of the pending interrupt, > since it requires immediate action. > Kick this VCPU once we have added the new IRQ to the list, but only > after dropping the locks. > > Reported-by: Stefano Stabellini <sstabellini@kernel.org> > Signed-off-by: Andre Przywara <andre.przywara@arm.com> Reviewed-by: Christoffer Dall <christoffer.dall@arm.com> > --- > virt/kvm/arm/vgic/vgic.c | 8 ++++++++ > 1 file changed, 8 insertions(+) > > diff --git a/virt/kvm/arm/vgic/vgic.c b/virt/kvm/arm/vgic/vgic.c > index e74baec76361..4b6d72939c42 100644 > --- a/virt/kvm/arm/vgic/vgic.c > +++ b/virt/kvm/arm/vgic/vgic.c > @@ -594,6 +594,7 @@ static void vgic_prune_ap_list(struct kvm_vcpu *vcpu) > > list_for_each_entry_safe(irq, tmp, &vgic_cpu->ap_list_head, ap_list) { > struct kvm_vcpu *target_vcpu, *vcpuA, *vcpuB; > + bool target_vcpu_needs_kick = false; > > spin_lock(&irq->irq_lock); > > @@ -664,11 +665,18 @@ static void vgic_prune_ap_list(struct kvm_vcpu *vcpu) > list_del(&irq->ap_list); > irq->vcpu = target_vcpu; > list_add_tail(&irq->ap_list, &new_cpu->ap_list_head); > + target_vcpu_needs_kick = true; > } > > spin_unlock(&irq->irq_lock); > spin_unlock(&vcpuB->arch.vgic_cpu.ap_list_lock); > spin_unlock_irqrestore(&vcpuA->arch.vgic_cpu.ap_list_lock, flags); > + > + if (target_vcpu_needs_kick) { > + kvm_make_request(KVM_REQ_IRQ_PENDING, target_vcpu); > + kvm_vcpu_kick(target_vcpu); > + } > + > goto retry; > } > > -- > 2.14.1 >
next prev parent reply other threads:[~2018-04-17 11:32 UTC|newest] Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top 2018-04-17 10:23 [PATCH] KVM: arm/arm64: VGIC: Kick new VCPU on interrupt migration Andre Przywara 2018-04-17 10:23 ` Andre Przywara 2018-04-17 11:32 ` Christoffer Dall [this message] 2018-04-17 11:32 ` Christoffer Dall
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