From: Marc Zyngier <marc.zyngier@arm.com> To: linux-arm-kernel@lists.infradead.org, kvmarm@lists.cs.columbia.edu, kvm@vger.kernel.org Cc: Christoffer Dall <christoffer.dall@linaro.org>, Eric Auger <eric.auger@redhat.com>, Shanker Donthineni <shankerd@codeaurora.org>, Mark Rutland <mark.rutland@arm.com>, Shameerali Kolothum Thodi <shameerali.kolothum.thodi@huawei.com>, Andre Przywara <Andre.Przywara@arm.com> Subject: [PATCH v4 14/26] KVM: arm/arm64: GICv4: Handle MOVALL applied to a vPE Date: Fri, 6 Oct 2017 16:33:49 +0100 [thread overview] Message-ID: <20171006153401.5481-15-marc.zyngier@arm.com> (raw) In-Reply-To: <20171006153401.5481-1-marc.zyngier@arm.com> The current implementation of MOVALL doesn't allow us to call into the core ITS code as we hold a number of spinlocks. Let's try a method used in other parts of the code, were we copy the intids of the candicate interrupts, and then do whatever we need to do with them outside of the critical section. This allows us to move the interrupts one by one, at the expense of a bit of CPU time. Who cares? MOVALL is such a stupid command anyway... Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> --- virt/kvm/arm/vgic/vgic-its.c | 19 ++++++++++--------- 1 file changed, 10 insertions(+), 9 deletions(-) diff --git a/virt/kvm/arm/vgic/vgic-its.c b/virt/kvm/arm/vgic/vgic-its.c index 5778b50911e8..0b7e648e7a0c 100644 --- a/virt/kvm/arm/vgic/vgic-its.c +++ b/virt/kvm/arm/vgic/vgic-its.c @@ -1148,11 +1148,12 @@ static int vgic_its_cmd_handle_invall(struct kvm *kvm, struct vgic_its *its, static int vgic_its_cmd_handle_movall(struct kvm *kvm, struct vgic_its *its, u64 *its_cmd) { - struct vgic_dist *dist = &kvm->arch.vgic; u32 target1_addr = its_cmd_get_target_addr(its_cmd); u32 target2_addr = its_cmd_mask_field(its_cmd, 3, 16, 32); struct kvm_vcpu *vcpu1, *vcpu2; struct vgic_irq *irq; + u32 *intids; + int irq_count, i; if (target1_addr >= atomic_read(&kvm->online_vcpus) || target2_addr >= atomic_read(&kvm->online_vcpus)) @@ -1164,19 +1165,19 @@ static int vgic_its_cmd_handle_movall(struct kvm *kvm, struct vgic_its *its, vcpu1 = kvm_get_vcpu(kvm, target1_addr); vcpu2 = kvm_get_vcpu(kvm, target2_addr); - spin_lock(&dist->lpi_list_lock); + irq_count = vgic_copy_lpi_list(vcpu1, &intids); + if (irq_count < 0) + return irq_count; - list_for_each_entry(irq, &dist->lpi_list_head, lpi_list) { - spin_lock(&irq->irq_lock); + for (i = 0; i < irq_count; i++) { + irq = vgic_get_irq(kvm, NULL, intids[i]); - if (irq->target_vcpu == vcpu1) - irq->target_vcpu = vcpu2; + update_affinity(irq, vcpu2); - spin_unlock(&irq->irq_lock); + vgic_put_irq(kvm, irq); } - spin_unlock(&dist->lpi_list_lock); - + kfree(intids); return 0; } -- 2.14.1
WARNING: multiple messages have this Message-ID (diff)
From: marc.zyngier@arm.com (Marc Zyngier) To: linux-arm-kernel@lists.infradead.org Subject: [PATCH v4 14/26] KVM: arm/arm64: GICv4: Handle MOVALL applied to a vPE Date: Fri, 6 Oct 2017 16:33:49 +0100 [thread overview] Message-ID: <20171006153401.5481-15-marc.zyngier@arm.com> (raw) In-Reply-To: <20171006153401.5481-1-marc.zyngier@arm.com> The current implementation of MOVALL doesn't allow us to call into the core ITS code as we hold a number of spinlocks. Let's try a method used in other parts of the code, were we copy the intids of the candicate interrupts, and then do whatever we need to do with them outside of the critical section. This allows us to move the interrupts one by one, at the expense of a bit of CPU time. Who cares? MOVALL is such a stupid command anyway... Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> --- virt/kvm/arm/vgic/vgic-its.c | 19 ++++++++++--------- 1 file changed, 10 insertions(+), 9 deletions(-) diff --git a/virt/kvm/arm/vgic/vgic-its.c b/virt/kvm/arm/vgic/vgic-its.c index 5778b50911e8..0b7e648e7a0c 100644 --- a/virt/kvm/arm/vgic/vgic-its.c +++ b/virt/kvm/arm/vgic/vgic-its.c @@ -1148,11 +1148,12 @@ static int vgic_its_cmd_handle_invall(struct kvm *kvm, struct vgic_its *its, static int vgic_its_cmd_handle_movall(struct kvm *kvm, struct vgic_its *its, u64 *its_cmd) { - struct vgic_dist *dist = &kvm->arch.vgic; u32 target1_addr = its_cmd_get_target_addr(its_cmd); u32 target2_addr = its_cmd_mask_field(its_cmd, 3, 16, 32); struct kvm_vcpu *vcpu1, *vcpu2; struct vgic_irq *irq; + u32 *intids; + int irq_count, i; if (target1_addr >= atomic_read(&kvm->online_vcpus) || target2_addr >= atomic_read(&kvm->online_vcpus)) @@ -1164,19 +1165,19 @@ static int vgic_its_cmd_handle_movall(struct kvm *kvm, struct vgic_its *its, vcpu1 = kvm_get_vcpu(kvm, target1_addr); vcpu2 = kvm_get_vcpu(kvm, target2_addr); - spin_lock(&dist->lpi_list_lock); + irq_count = vgic_copy_lpi_list(vcpu1, &intids); + if (irq_count < 0) + return irq_count; - list_for_each_entry(irq, &dist->lpi_list_head, lpi_list) { - spin_lock(&irq->irq_lock); + for (i = 0; i < irq_count; i++) { + irq = vgic_get_irq(kvm, NULL, intids[i]); - if (irq->target_vcpu == vcpu1) - irq->target_vcpu = vcpu2; + update_affinity(irq, vcpu2); - spin_unlock(&irq->irq_lock); + vgic_put_irq(kvm, irq); } - spin_unlock(&dist->lpi_list_lock); - + kfree(intids); return 0; } -- 2.14.1
next prev parent reply other threads:[~2017-10-06 15:34 UTC|newest] Thread overview: 117+ messages / expand[flat|nested] mbox.gz Atom feed top 2017-10-06 15:33 [PATCH v4 00/26] KVM/ARM: Add support for GICv4 Marc Zyngier 2017-10-06 15:33 ` Marc Zyngier 2017-10-06 15:33 ` [PATCH v4 01/26] KVM: arm/arm64: register irq bypass consumer on ARM/ARM64 Marc Zyngier 2017-10-06 15:33 ` Marc Zyngier 2017-10-06 15:33 ` [PATCH v4 02/26] KVM: arm/arm64: vgic: restructure kvm_vgic_(un)map_phys_irq Marc Zyngier 2017-10-06 15:33 ` Marc Zyngier 2017-10-25 14:44 ` Christoffer Dall 2017-10-25 14:44 ` Christoffer Dall 2017-10-26 13:05 ` Marc Zyngier 2017-10-26 13:05 ` Marc Zyngier 2017-10-06 15:33 ` [PATCH v4 03/26] KVM: arm: Select ARM_GIC_V3 and ARM_GIC_V3_ITS Marc Zyngier 2017-10-06 15:33 ` Marc Zyngier 2017-10-06 15:33 ` [PATCH v4 04/26] KVM: arm/arm64: vgic: Move kvm_vgic_destroy call around Marc Zyngier 2017-10-06 15:33 ` Marc Zyngier 2017-10-06 15:33 ` [PATCH v4 05/26] KVM: arm/arm64: vITS: Add MSI translation helpers Marc Zyngier 2017-10-06 15:33 ` Marc Zyngier 2017-10-06 15:33 ` [PATCH v4 06/26] KVM: arm/arm64: vITS: Add a helper to update the affinity of an LPI Marc Zyngier 2017-10-06 15:33 ` Marc Zyngier 2017-10-25 14:50 ` Christoffer Dall 2017-10-25 14:50 ` Christoffer Dall 2017-10-06 15:33 ` [PATCH v4 07/26] KVM: arm/arm64: GICv4: Add property field and per-VM predicate Marc Zyngier 2017-10-06 15:33 ` Marc Zyngier 2017-10-25 14:54 ` Christoffer Dall 2017-10-25 14:54 ` Christoffer Dall 2017-10-06 15:33 ` [PATCH v4 08/26] KVM: arm/arm64: GICv4: Add init/teardown of the per-VM vPE irq domain Marc Zyngier 2017-10-06 15:33 ` Marc Zyngier 2017-10-25 15:46 ` Christoffer Dall 2017-10-25 15:46 ` Christoffer Dall 2017-10-06 15:33 ` [PATCH v4 09/26] KVM: arm/arm64: GICv4: Wire mapping/unmapping of VLPIs in VFIO irq bypass Marc Zyngier 2017-10-06 15:33 ` Marc Zyngier 2017-10-25 15:58 ` Christoffer Dall 2017-10-25 15:58 ` Christoffer Dall 2017-10-06 15:33 ` [PATCH v4 10/26] KVM: arm/arm64: GICv4: Handle INT command applied to a VLPI Marc Zyngier 2017-10-06 15:33 ` Marc Zyngier 2017-10-06 15:33 ` [PATCH v4 11/26] KVM: arm/arm64: GICv4: Unmap VLPI when freeing an LPI Marc Zyngier 2017-10-06 15:33 ` Marc Zyngier 2017-10-06 15:33 ` [PATCH v4 12/26] KVM: arm/arm64: GICv4: Propagate affinity changes to the physical ITS Marc Zyngier 2017-10-06 15:33 ` Marc Zyngier 2017-10-25 16:22 ` Christoffer Dall 2017-10-25 16:22 ` Christoffer Dall 2017-10-06 15:33 ` [PATCH v4 13/26] KVM: arm/arm64: GICv4: Handle CLEAR applied to a VLPI Marc Zyngier 2017-10-06 15:33 ` Marc Zyngier 2017-10-06 15:33 ` Marc Zyngier [this message] 2017-10-06 15:33 ` [PATCH v4 14/26] KVM: arm/arm64: GICv4: Handle MOVALL applied to a vPE Marc Zyngier 2017-10-25 16:27 ` Christoffer Dall 2017-10-25 16:27 ` Christoffer Dall 2017-10-06 15:33 ` [PATCH v4 15/26] KVM: arm/arm64: GICv4: Propagate property updates to VLPIs Marc Zyngier 2017-10-06 15:33 ` Marc Zyngier 2017-10-06 15:33 ` [PATCH v4 16/26] KVM: arm/arm64: GICv4: Handle INVALL applied to a vPE Marc Zyngier 2017-10-06 15:33 ` Marc Zyngier 2017-10-06 15:33 ` [PATCH v4 17/26] KVM: arm/arm64: GICv4: Propagate VLPI properties at map time Marc Zyngier 2017-10-06 15:33 ` Marc Zyngier 2017-10-25 16:48 ` Christoffer Dall 2017-10-25 16:48 ` Christoffer Dall 2017-10-25 17:01 ` Marc Zyngier 2017-10-25 17:01 ` Marc Zyngier 2017-10-26 8:21 ` Marc Zyngier 2017-10-26 8:21 ` Marc Zyngier 2017-10-06 15:33 ` [PATCH v4 18/26] KVM: arm/arm64: GICv4: Use pending_last as a scheduling hint Marc Zyngier 2017-10-06 15:33 ` Marc Zyngier 2017-10-06 15:33 ` [PATCH v4 19/26] KVM: arm/arm64: GICv4: Add doorbell interrupt handling Marc Zyngier 2017-10-06 15:33 ` Marc Zyngier 2017-10-26 14:28 ` Christoffer Dall 2017-10-26 14:28 ` Christoffer Dall 2017-10-26 15:25 ` Christoffer Dall 2017-10-26 15:25 ` Christoffer Dall 2017-10-06 15:33 ` [PATCH v4 20/26] KVM: arm/arm64: GICv4: Use the doorbell interrupt as an unblocking source Marc Zyngier 2017-10-06 15:33 ` Marc Zyngier 2017-10-06 15:33 ` [PATCH v4 21/26] KVM: arm/arm64: GICv4: Hook vPE scheduling into vgic flush/sync Marc Zyngier 2017-10-06 15:33 ` Marc Zyngier 2017-10-26 15:24 ` Christoffer Dall 2017-10-26 15:24 ` Christoffer Dall 2017-10-06 15:33 ` [PATCH v4 22/26] KVM: arm/arm64: GICv4: Enable virtual cpuif if VLPIs can be delivered Marc Zyngier 2017-10-06 15:33 ` Marc Zyngier 2017-10-06 15:33 ` [PATCH v4 23/26] KVM: arm/arm64: GICv4: Prevent a VM using GICv4 from being saved Marc Zyngier 2017-10-06 15:33 ` Marc Zyngier 2017-10-26 15:28 ` Christoffer Dall 2017-10-26 15:28 ` Christoffer Dall 2017-10-27 13:56 ` Marc Zyngier 2017-10-27 13:56 ` Marc Zyngier 2017-10-30 6:48 ` Christoffer Dall 2017-10-30 6:48 ` Christoffer Dall 2017-10-06 15:33 ` [PATCH v4 24/26] KVM: arm/arm64: GICv4: Enable VLPI support Marc Zyngier 2017-10-06 15:33 ` Marc Zyngier 2017-10-06 15:34 ` [PATCH v4 25/26] KVM: arm/arm64: GICv4: Prevent heterogenous systems from using GICv4 Marc Zyngier 2017-10-06 15:34 ` Marc Zyngier 2017-10-26 15:31 ` Christoffer Dall 2017-10-26 15:31 ` Christoffer Dall 2017-10-26 15:48 ` Mark Rutland 2017-10-26 15:48 ` Mark Rutland 2017-10-27 6:57 ` Marc Zyngier 2017-10-27 6:57 ` Marc Zyngier 2017-10-27 6:57 ` Marc Zyngier 2017-10-27 7:37 ` Mark Rutland 2017-10-27 7:37 ` Mark Rutland 2017-10-27 7:59 ` Marc Zyngier 2017-10-27 7:59 ` Marc Zyngier 2017-10-27 7:59 ` Marc Zyngier 2017-10-27 8:04 ` Mark Rutland 2017-10-27 8:04 ` Mark Rutland 2017-10-27 8:31 ` Marc Zyngier 2017-10-27 8:31 ` Marc Zyngier 2017-10-27 8:31 ` Marc Zyngier 2017-10-29 2:16 ` Christoffer Dall 2017-10-29 2:16 ` Christoffer Dall 2017-10-06 15:34 ` [PATCH v4 26/26] KVM: arm/arm64: GICv4: Theory of operations Marc Zyngier 2017-10-06 15:34 ` Marc Zyngier 2017-10-26 15:32 ` Christoffer Dall 2017-10-26 15:32 ` Christoffer Dall 2017-10-08 16:45 ` [PATCH v4 00/26] KVM/ARM: Add support for GICv4 Shanker Donthineni 2017-10-08 16:45 ` Shanker Donthineni 2017-10-09 17:52 ` Konrad Rzeszutek Wilk 2017-10-09 17:52 ` Konrad Rzeszutek Wilk 2017-10-09 18:02 ` Marc Zyngier 2017-10-09 18:02 ` Marc Zyngier 2017-10-19 15:48 ` [PATCH v4 27/26] KVM: arm/arm64: GICv4: Prevent userspace from changing doorbell affinity Marc Zyngier 2017-10-19 15:48 ` Marc Zyngier
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