From: christoffer.dall@linaro.org (Christoffer Dall)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH 05/10] KVM: arm/arm64: vgic: Relax vgic_can_sample_irq for edge IRQs
Date: Tue, 30 Jun 2015 22:19:33 +0200 [thread overview]
Message-ID: <20150630201933.GA11332@cbox> (raw)
In-Reply-To: <1433783045-8002-6-git-send-email-marc.zyngier@arm.com>
On Mon, Jun 08, 2015 at 06:04:00PM +0100, Marc Zyngier wrote:
> We only set the irq_queued flag for level interrupts, meaning
> that "!vgic_irq_is_queued(vcpu, irq)" is a good enough predicate
> for all interrupts.
>
> This will allow us to inject edge HW interrupts, for which the
> state ACTIVE+PENDING is not allowed.
I don't understand this; ACTIVE+PENDING is allowed for edge interrupts.
Do you mean that if we set the HW bit in the LR, then we are linking to
an HW interrupt where we don't allow that to be ACTIVE+PENDING on the HW
GIC side?
Why is this relevant here? I feel like I'm missing context.
Thanks,
-Christoffer
>
> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
> ---
> virt/kvm/arm/vgic.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/virt/kvm/arm/vgic.c b/virt/kvm/arm/vgic.c
> index 78fb820..59ed7a3 100644
> --- a/virt/kvm/arm/vgic.c
> +++ b/virt/kvm/arm/vgic.c
> @@ -377,7 +377,7 @@ void vgic_cpu_irq_clear(struct kvm_vcpu *vcpu, int irq)
>
> static bool vgic_can_sample_irq(struct kvm_vcpu *vcpu, int irq)
> {
> - return vgic_irq_is_edge(vcpu, irq) || !vgic_irq_is_queued(vcpu, irq);
> + return !vgic_irq_is_queued(vcpu, irq);
> }
>
> /**
> --
> 2.1.4
>
WARNING: multiple messages have this Message-ID (diff)
From: Christoffer Dall <christoffer.dall@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,
"Eric Auger" <eric.auger@linaro.org>,
"Alex Bennée" <alex.bennee@linaro.org>,
"Andre Przywara" <andre.przywara@arm.com>
Subject: Re: [PATCH 05/10] KVM: arm/arm64: vgic: Relax vgic_can_sample_irq for edge IRQs
Date: Tue, 30 Jun 2015 22:19:33 +0200 [thread overview]
Message-ID: <20150630201933.GA11332@cbox> (raw)
In-Reply-To: <1433783045-8002-6-git-send-email-marc.zyngier@arm.com>
On Mon, Jun 08, 2015 at 06:04:00PM +0100, Marc Zyngier wrote:
> We only set the irq_queued flag for level interrupts, meaning
> that "!vgic_irq_is_queued(vcpu, irq)" is a good enough predicate
> for all interrupts.
>
> This will allow us to inject edge HW interrupts, for which the
> state ACTIVE+PENDING is not allowed.
I don't understand this; ACTIVE+PENDING is allowed for edge interrupts.
Do you mean that if we set the HW bit in the LR, then we are linking to
an HW interrupt where we don't allow that to be ACTIVE+PENDING on the HW
GIC side?
Why is this relevant here? I feel like I'm missing context.
Thanks,
-Christoffer
>
> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
> ---
> virt/kvm/arm/vgic.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/virt/kvm/arm/vgic.c b/virt/kvm/arm/vgic.c
> index 78fb820..59ed7a3 100644
> --- a/virt/kvm/arm/vgic.c
> +++ b/virt/kvm/arm/vgic.c
> @@ -377,7 +377,7 @@ void vgic_cpu_irq_clear(struct kvm_vcpu *vcpu, int irq)
>
> static bool vgic_can_sample_irq(struct kvm_vcpu *vcpu, int irq)
> {
> - return vgic_irq_is_edge(vcpu, irq) || !vgic_irq_is_queued(vcpu, irq);
> + return !vgic_irq_is_queued(vcpu, irq);
> }
>
> /**
> --
> 2.1.4
>
next prev parent reply other threads:[~2015-06-30 20:19 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
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 [this message]
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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