From: "Alex Bennée" <alex.bennee@linaro.org> To: Marc Zyngier <marc.zyngier@arm.com> Cc: kvm@vger.kernel.org, kvmarm@lists.cs.columbia.edu, linux-arm-kernel@lists.infradead.org, Christoffer Dall <christoffer.dall@linaro.org>, Eric Auger <eric.auger@linaro.org>, Andre Przywara <andre.przywara@arm.com> Subject: Re: [PATCH 04/10] KVM: arm/arm64: vgic: Allow HW irq to be encoded in LR Date: Tue, 09 Jun 2015 14:21:20 +0100 [thread overview] Message-ID: <87sia16mr3.fsf@linaro.org> (raw) In-Reply-To: <1433783045-8002-5-git-send-email-marc.zyngier@arm.com> Marc Zyngier <marc.zyngier@arm.com> writes: > Now that struct vgic_lr supports the LR_HW bit and carries a hwirq > field, we can encode that information into the list registers. > > This patch provides implementations for both GICv2 and GICv3. > > Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> > --- > include/linux/irqchip/arm-gic-v3.h | 3 +++ > include/linux/irqchip/arm-gic.h | 3 ++- > virt/kvm/arm/vgic-v2.c | 16 +++++++++++++++- > virt/kvm/arm/vgic-v3.c | 21 ++++++++++++++++++--- > 4 files changed, 38 insertions(+), 5 deletions(-) > > diff --git a/include/linux/irqchip/arm-gic-v3.h b/include/linux/irqchip/arm-gic-v3.h > index ffbc034..cf637d6 100644 <snip> > @@ -84,10 +88,17 @@ static void vgic_v3_set_lr(struct kvm_vcpu *vcpu, int lr, > * Eventually we want to make this configurable, so we may revisit > * this in the future. > */ > - if (vcpu->kvm->arch.vgic.vgic_model == KVM_DEV_TYPE_ARM_VGIC_V3) > + switch (vcpu->kvm->arch.vgic.vgic_model) { > + case KVM_DEV_TYPE_ARM_VGIC_V3: > lr_val |= ICH_LR_GROUP; > - else > - lr_val |= (u32)lr_desc.source << GICH_LR_PHYSID_CPUID_SHIFT; > + break; > + case KVM_DEV_TYPE_ARM_VGIC_V2: > + if (lr_desc.irq < VGIC_NR_SGIS) > + lr_val |= (u32)lr_desc.source << GICH_LR_PHYSID_CPUID_SHIFT; > + break; > + default: > + BUG(); > + } > > if (lr_desc.state & LR_STATE_PENDING) > lr_val |= ICH_LR_PENDING_BIT; > @@ -95,6 +106,10 @@ static void vgic_v3_set_lr(struct kvm_vcpu *vcpu, int lr, > lr_val |= ICH_LR_ACTIVE_BIT; > if (lr_desc.state & LR_EOI_INT) > lr_val |= ICH_LR_EOI; > + if (lr_desc.state & LR_HW) { > + lr_val |= ICH_LR_HW; > + lr_val |= ((u64)lr_desc.hwirq) << ICH_LR_PHYS_ID_SHIFT; > + } > Why is the bracketing different for the casting of lr_desc.hwirq compared to lr_desc.source. Surely the precedence of up-casting before the shift is the same in both cases? > vcpu->arch.vgic_cpu.vgic_v3.vgic_lr[LR_INDEX(lr)] = lr_val; > } -- Alex Bennée
WARNING: multiple messages have this Message-ID (diff)
From: alex.bennee@linaro.org (Alex Bennée) To: linux-arm-kernel@lists.infradead.org Subject: [PATCH 04/10] KVM: arm/arm64: vgic: Allow HW irq to be encoded in LR Date: Tue, 09 Jun 2015 14:21:20 +0100 [thread overview] Message-ID: <87sia16mr3.fsf@linaro.org> (raw) In-Reply-To: <1433783045-8002-5-git-send-email-marc.zyngier@arm.com> Marc Zyngier <marc.zyngier@arm.com> writes: > Now that struct vgic_lr supports the LR_HW bit and carries a hwirq > field, we can encode that information into the list registers. > > This patch provides implementations for both GICv2 and GICv3. > > Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> > --- > include/linux/irqchip/arm-gic-v3.h | 3 +++ > include/linux/irqchip/arm-gic.h | 3 ++- > virt/kvm/arm/vgic-v2.c | 16 +++++++++++++++- > virt/kvm/arm/vgic-v3.c | 21 ++++++++++++++++++--- > 4 files changed, 38 insertions(+), 5 deletions(-) > > diff --git a/include/linux/irqchip/arm-gic-v3.h b/include/linux/irqchip/arm-gic-v3.h > index ffbc034..cf637d6 100644 <snip> > @@ -84,10 +88,17 @@ static void vgic_v3_set_lr(struct kvm_vcpu *vcpu, int lr, > * Eventually we want to make this configurable, so we may revisit > * this in the future. > */ > - if (vcpu->kvm->arch.vgic.vgic_model == KVM_DEV_TYPE_ARM_VGIC_V3) > + switch (vcpu->kvm->arch.vgic.vgic_model) { > + case KVM_DEV_TYPE_ARM_VGIC_V3: > lr_val |= ICH_LR_GROUP; > - else > - lr_val |= (u32)lr_desc.source << GICH_LR_PHYSID_CPUID_SHIFT; > + break; > + case KVM_DEV_TYPE_ARM_VGIC_V2: > + if (lr_desc.irq < VGIC_NR_SGIS) > + lr_val |= (u32)lr_desc.source << GICH_LR_PHYSID_CPUID_SHIFT; > + break; > + default: > + BUG(); > + } > > if (lr_desc.state & LR_STATE_PENDING) > lr_val |= ICH_LR_PENDING_BIT; > @@ -95,6 +106,10 @@ static void vgic_v3_set_lr(struct kvm_vcpu *vcpu, int lr, > lr_val |= ICH_LR_ACTIVE_BIT; > if (lr_desc.state & LR_EOI_INT) > lr_val |= ICH_LR_EOI; > + if (lr_desc.state & LR_HW) { > + lr_val |= ICH_LR_HW; > + lr_val |= ((u64)lr_desc.hwirq) << ICH_LR_PHYS_ID_SHIFT; > + } > Why is the bracketing different for the casting of lr_desc.hwirq compared to lr_desc.source. Surely the precedence of up-casting before the shift is the same in both cases? > vcpu->arch.vgic_cpu.vgic_v3.vgic_lr[LR_INDEX(lr)] = lr_val; > } -- Alex Benn?e
next prev parent reply other threads:[~2015-06-09 13:20 UTC|newest] Thread overview: 118+ messages / expand[flat|nested] mbox.gz Atom feed top 2015-06-08 17:03 [PATCH 00/10] arm/arm64: KVM: Active interrupt state switching for shared devices Marc Zyngier 2015-06-08 17:03 ` Marc Zyngier 2015-06-08 17:03 ` [PATCH 01/10] arm/arm64: KVM: Fix ordering of timer/GIC on guest entry Marc Zyngier 2015-06-08 17:03 ` Marc Zyngier 2015-06-09 11:29 ` Alex Bennée 2015-06-09 11:29 ` Alex Bennée 2015-06-30 20:19 ` Christoffer Dall 2015-06-30 20:19 ` Christoffer Dall 2015-06-08 17:03 ` [PATCH 02/10] arm/arm64: KVM: Move vgic handling to a non-preemptible section Marc Zyngier 2015-06-08 17:03 ` Marc Zyngier 2015-06-09 11:38 ` Alex Bennée 2015-06-09 11:38 ` Alex Bennée 2015-06-30 20:19 ` Christoffer Dall 2015-06-30 20:19 ` Christoffer Dall 2015-06-08 17:03 ` [PATCH 03/10] KVM: arm/arm64: vgic: Convert struct vgic_lr to use bitfields Marc Zyngier 2015-06-08 17:03 ` Marc Zyngier 2015-06-09 13:12 ` Alex Bennée 2015-06-09 13:12 ` Alex Bennée 2015-06-10 17:23 ` Andre Przywara 2015-06-10 17:23 ` Andre Przywara 2015-06-10 18:04 ` Marc Zyngier 2015-06-10 18:04 ` Marc Zyngier 2015-06-08 17:03 ` [PATCH 04/10] KVM: arm/arm64: vgic: Allow HW irq to be encoded in LR Marc Zyngier 2015-06-08 17:03 ` Marc Zyngier 2015-06-09 13:21 ` Alex Bennée [this message] 2015-06-09 13:21 ` Alex Bennée 2015-06-09 14:03 ` Marc Zyngier 2015-06-09 14:03 ` Marc Zyngier 2015-06-17 11:53 ` Eric Auger 2015-06-17 11:53 ` Eric Auger 2015-06-17 12:39 ` Marc Zyngier 2015-06-17 12:39 ` Marc Zyngier 2015-06-17 13:21 ` Peter Maydell 2015-06-17 13:21 ` Peter Maydell 2015-06-17 13:34 ` Marc Zyngier 2015-06-17 13:34 ` Marc Zyngier 2015-06-08 17:04 ` [PATCH 05/10] KVM: arm/arm64: vgic: Relax vgic_can_sample_irq for edge IRQs Marc Zyngier 2015-06-08 17:04 ` Marc Zyngier 2015-06-30 20:19 ` Christoffer Dall 2015-06-30 20:19 ` Christoffer Dall 2015-07-01 9:17 ` Marc Zyngier 2015-07-01 9:17 ` Marc Zyngier 2015-07-01 11:58 ` Christoffer Dall 2015-07-01 11:58 ` Christoffer Dall 2015-07-01 18:18 ` Marc Zyngier 2015-07-01 18:18 ` Marc Zyngier 2015-07-02 16:23 ` Christoffer Dall 2015-07-02 16:23 ` Christoffer Dall 2015-07-03 9:50 ` Marc Zyngier 2015-07-03 9:50 ` Marc Zyngier 2015-07-03 9:57 ` Peter Maydell 2015-07-03 9:57 ` Peter Maydell 2015-06-08 17:04 ` [PATCH 06/10] KVM: arm/arm64: vgic: Allow dynamic mapping of physical/virtual interrupts Marc Zyngier 2015-06-08 17:04 ` Marc Zyngier 2015-06-11 8:43 ` Andre Przywara 2015-06-11 8:43 ` Andre Przywara 2015-06-11 8:56 ` Marc Zyngier 2015-06-11 8:56 ` Marc Zyngier 2015-06-15 15:44 ` Eric Auger 2015-06-15 15:44 ` Eric Auger 2015-06-16 8:28 ` Marc Zyngier 2015-06-16 8:28 ` Marc Zyngier 2015-06-16 9:10 ` Eric Auger 2015-06-16 9:10 ` Eric Auger 2015-06-30 20:19 ` Christoffer Dall 2015-06-30 20:19 ` Christoffer Dall 2015-07-01 10:20 ` Marc Zyngier 2015-07-01 10:20 ` Marc Zyngier 2015-07-01 11:45 ` Christoffer Dall 2015-07-01 11:45 ` Christoffer Dall 2015-06-08 17:04 ` [PATCH 07/10] KVM: arm/arm64: vgic: Allow HW interrupts to be queued to a guest Marc Zyngier 2015-06-08 17:04 ` Marc Zyngier 2015-06-11 8:44 ` Andre Przywara 2015-06-11 8:44 ` Andre Przywara 2015-06-11 9:15 ` Marc Zyngier 2015-06-11 9:15 ` Marc Zyngier 2015-06-11 9:44 ` Andre Przywara 2015-06-11 9:44 ` Andre Przywara 2015-06-11 10:02 ` Marc Zyngier 2015-06-11 10:02 ` Marc Zyngier 2015-06-15 16:11 ` Eric Auger 2015-06-15 16:11 ` Eric Auger 2015-06-17 11:51 ` Eric Auger 2015-06-17 11:51 ` Eric Auger 2015-06-17 12:23 ` Marc Zyngier 2015-06-17 12:23 ` Marc Zyngier 2015-06-08 17:04 ` [PATCH 08/10] KVM: arm/arm64: vgic: Add vgic_{get,set}_phys_irq_active Marc Zyngier 2015-06-08 17:04 ` [PATCH 08/10] KVM: arm/arm64: vgic: Add vgic_{get, set}_phys_irq_active Marc Zyngier 2015-06-17 15:11 ` [PATCH 08/10] KVM: arm/arm64: vgic: Add vgic_{get,set}_phys_irq_active Eric Auger 2015-06-17 15:11 ` [PATCH 08/10] KVM: arm/arm64: vgic: Add vgic_{get, set}_phys_irq_active Eric Auger 2015-06-08 17:04 ` [PATCH 09/10] KVM: arm/arm64: timer: Allow the timer to control the active state Marc Zyngier 2015-06-08 17:04 ` Marc Zyngier 2015-06-08 17:04 ` [PATCH 10/10] KVM: arm/arm64: vgic: Allow non-shared device HW interrupts Marc Zyngier 2015-06-08 17:04 ` Marc Zyngier 2015-06-17 15:11 ` Eric Auger 2015-06-17 15:11 ` Eric Auger 2015-06-17 15:37 ` Marc Zyngier 2015-06-17 15:37 ` Marc Zyngier 2015-06-17 15:50 ` Eric Auger 2015-06-17 15:50 ` Eric Auger 2015-06-18 8:37 ` Marc Zyngier 2015-06-18 8:37 ` Marc Zyngier 2015-06-18 17:51 ` Eric Auger 2015-06-18 17:51 ` Eric Auger 2015-06-30 20:19 ` Christoffer Dall 2015-06-30 20:19 ` Christoffer Dall 2015-07-01 8:26 ` Marc Zyngier 2015-07-01 8:26 ` Marc Zyngier 2015-07-01 8:57 ` Christoffer Dall 2015-07-01 8:57 ` Christoffer Dall 2015-06-10 8:33 ` [PATCH 00/10] arm/arm64: KVM: Active interrupt state switching for shared devices Eric Auger 2015-06-10 8:33 ` Eric Auger 2015-06-10 9:03 ` Marc Zyngier 2015-06-10 9:03 ` Marc Zyngier 2015-06-10 11:13 ` Eric Auger 2015-06-10 11:13 ` Eric Auger 2015-06-18 6:51 ` Eric Auger 2015-06-18 6:51 ` Eric Auger
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