From: Marc Zyngier <marc.zyngier@arm.com> To: Paolo Bonzini <pbonzini@redhat.com>, Gleb Natapov <gleb@kernel.org> Cc: Christoffer Dall <christoffer.dall@linaro.org>, kvm@vger.kernel.org, kvmarm@lists.cs.columbia.edu, linux-arm-kernel@lists.infradead.org Subject: [PATCH] KVM: arm/arm64: vgic-new: Try to insert multi-source SGIs at once Date: Fri, 18 Dec 2015 13:00:09 +0000 [thread overview] Message-ID: <1450443609-2233-2-git-send-email-marc.zyngier@arm.com> (raw) In-Reply-To: <1450443609-2233-1-git-send-email-marc.zyngier@arm.com> Improve handling of multi-source SGIs: instead of only inserting one source per SGI per run, try to insert them all at once. Hopefully this is a rare case. Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> --- virt/kvm/arm/vgic/vgic.c | 30 ++++++++++++++++++++++++++---- 1 file changed, 26 insertions(+), 4 deletions(-) diff --git a/virt/kvm/arm/vgic/vgic.c b/virt/kvm/arm/vgic/vgic.c index c6f04a1..052f917 100644 --- a/virt/kvm/arm/vgic/vgic.c +++ b/virt/kvm/arm/vgic/vgic.c @@ -371,15 +371,22 @@ static int compute_ap_list_depth(struct kvm_vcpu *vcpu) struct vgic_irq *irq; int count = 0; - list_for_each_entry(irq, &vgic_cpu->ap_list_head, ap_list) - count++; - + list_for_each_entry(irq, &vgic_cpu->ap_list_head, ap_list) { + spin_lock(&irq->irq_lock); + /* GICv2 SGIs can count for more than one... */ + if (irq->intid < VGIC_NR_SGIS && irq->source) + count += hweight8(irq->source); + else + count++; + spin_unlock(&irq->irq_lock); + } return count; } static void vgic_populate_lrs(struct kvm_vcpu *vcpu) { struct vgic_cpu *vgic_cpu = &vcpu->arch.vgic_cpu; + u32 model = vcpu->kvm->arch.vgic.vgic_model; struct vgic_irq *irq; int count = 0; @@ -390,8 +397,23 @@ static void vgic_populate_lrs(struct kvm_vcpu *vcpu) list_for_each_entry(irq, &vgic_cpu->ap_list_head, ap_list) { spin_lock(&irq->irq_lock); - if (vgic_target_oracle(irq) == vcpu) + + if (unlikely(vgic_target_oracle(irq) != vcpu)) + goto next; + + /* + * If we get an SGI with multiple sources, try to get + * them in all at once. + */ + if (model == KVM_DEV_TYPE_ARM_VGIC_V2 && + irq->intid < VGIC_NR_SGIS) { + while(irq->source && count < vcpu->arch.vgic_cpu.nr_lr) + vgic_populate_lr(vcpu, irq, count++); + } else { vgic_populate_lr(vcpu, irq, count++); + } + + next: spin_unlock(&irq->irq_lock); if (count == vcpu->arch.vgic_cpu.nr_lr) -- 2.1.4
WARNING: multiple messages have this Message-ID (diff)
From: marc.zyngier@arm.com (Marc Zyngier) To: linux-arm-kernel@lists.infradead.org Subject: [PATCH] KVM: arm/arm64: vgic-new: Try to insert multi-source SGIs at once Date: Fri, 18 Dec 2015 13:00:09 +0000 [thread overview] Message-ID: <1450443609-2233-2-git-send-email-marc.zyngier@arm.com> (raw) In-Reply-To: <1450443609-2233-1-git-send-email-marc.zyngier@arm.com> Improve handling of multi-source SGIs: instead of only inserting one source per SGI per run, try to insert them all at once. Hopefully this is a rare case. Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> --- virt/kvm/arm/vgic/vgic.c | 30 ++++++++++++++++++++++++++---- 1 file changed, 26 insertions(+), 4 deletions(-) diff --git a/virt/kvm/arm/vgic/vgic.c b/virt/kvm/arm/vgic/vgic.c index c6f04a1..052f917 100644 --- a/virt/kvm/arm/vgic/vgic.c +++ b/virt/kvm/arm/vgic/vgic.c @@ -371,15 +371,22 @@ static int compute_ap_list_depth(struct kvm_vcpu *vcpu) struct vgic_irq *irq; int count = 0; - list_for_each_entry(irq, &vgic_cpu->ap_list_head, ap_list) - count++; - + list_for_each_entry(irq, &vgic_cpu->ap_list_head, ap_list) { + spin_lock(&irq->irq_lock); + /* GICv2 SGIs can count for more than one... */ + if (irq->intid < VGIC_NR_SGIS && irq->source) + count += hweight8(irq->source); + else + count++; + spin_unlock(&irq->irq_lock); + } return count; } static void vgic_populate_lrs(struct kvm_vcpu *vcpu) { struct vgic_cpu *vgic_cpu = &vcpu->arch.vgic_cpu; + u32 model = vcpu->kvm->arch.vgic.vgic_model; struct vgic_irq *irq; int count = 0; @@ -390,8 +397,23 @@ static void vgic_populate_lrs(struct kvm_vcpu *vcpu) list_for_each_entry(irq, &vgic_cpu->ap_list_head, ap_list) { spin_lock(&irq->irq_lock); - if (vgic_target_oracle(irq) == vcpu) + + if (unlikely(vgic_target_oracle(irq) != vcpu)) + goto next; + + /* + * If we get an SGI with multiple sources, try to get + * them in all at once. + */ + if (model == KVM_DEV_TYPE_ARM_VGIC_V2 && + irq->intid < VGIC_NR_SGIS) { + while(irq->source && count < vcpu->arch.vgic_cpu.nr_lr) + vgic_populate_lr(vcpu, irq, count++); + } else { vgic_populate_lr(vcpu, irq, count++); + } + + next: spin_unlock(&irq->irq_lock); if (count == vcpu->arch.vgic_cpu.nr_lr) -- 2.1.4
next prev parent reply other threads:[~2015-12-18 13:00 UTC|newest] Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top 2015-12-18 13:00 [PULL] KVM/ARM fixes for v4.4-rc6 Marc Zyngier 2015-12-18 13:00 ` Marc Zyngier 2015-12-18 13:00 ` Marc Zyngier [this message] 2015-12-18 13:00 ` [PATCH] KVM: arm/arm64: vgic-new: Try to insert multi-source SGIs at once Marc Zyngier 2015-12-18 14:01 ` [PULL] KVM/ARM fixes for v4.4-rc6 Marc Zyngier 2015-12-18 14:01 ` Marc Zyngier
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