From: Marc Zyngier <marc.zyngier@arm.com> To: kvm@vger.kernel.org, kvmarm@lists.cs.columbia.edu, linux-arm-kernel@lists.infradead.org Cc: Andre Przywara <andre.przywara@arm.com> Subject: [PATCH 01/10] arm/arm64: KVM: Fix ordering of timer/GIC on guest entry Date: Mon, 8 Jun 2015 18:03:56 +0100 [thread overview] Message-ID: <1433783045-8002-2-git-send-email-marc.zyngier@arm.com> (raw) In-Reply-To: <1433783045-8002-1-git-send-email-marc.zyngier@arm.com> As we now inject the timer interrupt when we're about to enter the guest, it makes a lot more sense to make sure this happens before the vgic code queues the pending interrupts. Otherwise, we get the interrupt on the following exit, which is not great for latency (and leads to all kind of bizarre issues when using with active interrupts at the HW level). Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> --- arch/arm/kvm/arm.c | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-) diff --git a/arch/arm/kvm/arm.c b/arch/arm/kvm/arm.c index d9631ec..46db690 100644 --- a/arch/arm/kvm/arm.c +++ b/arch/arm/kvm/arm.c @@ -529,9 +529,10 @@ int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *run) if (vcpu->arch.pause) vcpu_pause(vcpu); - kvm_vgic_flush_hwstate(vcpu); kvm_timer_flush_hwstate(vcpu); + kvm_vgic_flush_hwstate(vcpu); + local_irq_disable(); /* @@ -544,8 +545,8 @@ int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *run) if (ret <= 0 || need_new_vmid_gen(vcpu->kvm)) { local_irq_enable(); - kvm_timer_sync_hwstate(vcpu); kvm_vgic_sync_hwstate(vcpu); + kvm_timer_sync_hwstate(vcpu); continue; } @@ -577,9 +578,10 @@ int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *run) * Back from guest *************************************************************/ - kvm_timer_sync_hwstate(vcpu); kvm_vgic_sync_hwstate(vcpu); + kvm_timer_sync_hwstate(vcpu); + ret = handle_exit(vcpu, run, ret); } -- 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 01/10] arm/arm64: KVM: Fix ordering of timer/GIC on guest entry Date: Mon, 8 Jun 2015 18:03:56 +0100 [thread overview] Message-ID: <1433783045-8002-2-git-send-email-marc.zyngier@arm.com> (raw) In-Reply-To: <1433783045-8002-1-git-send-email-marc.zyngier@arm.com> As we now inject the timer interrupt when we're about to enter the guest, it makes a lot more sense to make sure this happens before the vgic code queues the pending interrupts. Otherwise, we get the interrupt on the following exit, which is not great for latency (and leads to all kind of bizarre issues when using with active interrupts at the HW level). Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> --- arch/arm/kvm/arm.c | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-) diff --git a/arch/arm/kvm/arm.c b/arch/arm/kvm/arm.c index d9631ec..46db690 100644 --- a/arch/arm/kvm/arm.c +++ b/arch/arm/kvm/arm.c @@ -529,9 +529,10 @@ int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *run) if (vcpu->arch.pause) vcpu_pause(vcpu); - kvm_vgic_flush_hwstate(vcpu); kvm_timer_flush_hwstate(vcpu); + kvm_vgic_flush_hwstate(vcpu); + local_irq_disable(); /* @@ -544,8 +545,8 @@ int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *run) if (ret <= 0 || need_new_vmid_gen(vcpu->kvm)) { local_irq_enable(); - kvm_timer_sync_hwstate(vcpu); kvm_vgic_sync_hwstate(vcpu); + kvm_timer_sync_hwstate(vcpu); continue; } @@ -577,9 +578,10 @@ int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *run) * Back from guest *************************************************************/ - kvm_timer_sync_hwstate(vcpu); kvm_vgic_sync_hwstate(vcpu); + kvm_timer_sync_hwstate(vcpu); + ret = handle_exit(vcpu, run, ret); } -- 2.1.4
next prev parent reply other threads:[~2015-06-08 17:03 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 ` Marc Zyngier [this message] 2015-06-08 17:03 ` [PATCH 01/10] arm/arm64: KVM: Fix ordering of timer/GIC on guest entry 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 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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