From: Christoffer Dall <cdall@linaro.org>
To: Marc Zyngier <marc.zyngier@arm.com>
Cc: linux-kernel@vger.kernel.org,
linux-arm-kernel@lists.infradead.org,
kvmarm@lists.cs.columbia.edu, kvm@vger.kernel.org,
Christoffer Dall <christoffer.dall@linaro.org>,
Thomas Gleixner <tglx@linutronix.de>,
Jason Cooper <jason@lakedaemon.net>,
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>
Subject: Re: [PATCH v3 41/59] KVM: arm/arm64: GICv4: Wire mapping/unmapping of VLPIs in VFIO irq bypass
Date: Wed, 30 Aug 2017 13:46:46 +0200 [thread overview]
Message-ID: <20170830114646.GD24522@cbox> (raw)
In-Reply-To: <06930ddb-6c40-ff74-0062-cec236ce2455@arm.com>
On Wed, Aug 30, 2017 at 11:28:08AM +0100, Marc Zyngier wrote:
> On 26/08/17 20:48, Christoffer Dall wrote:
> > On Mon, Jul 31, 2017 at 06:26:19PM +0100, Marc Zyngier wrote:
> >> Let's use the irq bypass mechanism introduced for platform device
> >> interrupts to intercept the virtual PCIe endpoint configuration
> >> and establish our LPI->VLPI mapping.
> >>
> >> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
> >> ---
> >> include/kvm/arm_vgic.h | 8 ++++
> >> virt/kvm/arm/arm.c | 27 ++++++++----
> >> virt/kvm/arm/vgic/vgic-v4.c | 103 ++++++++++++++++++++++++++++++++++++++++++++
> >> 3 files changed, 130 insertions(+), 8 deletions(-)
> >>
> >> diff --git a/include/kvm/arm_vgic.h b/include/kvm/arm_vgic.h
> >> index 359eeffe9857..050f78d4fb42 100644
> >> --- a/include/kvm/arm_vgic.h
> >> +++ b/include/kvm/arm_vgic.h
> >> @@ -367,4 +367,12 @@ int kvm_vgic_set_forwarding(struct kvm *kvm, unsigned int host_irq,
> >> void kvm_vgic_unset_forwarding(struct kvm *kvm, unsigned int host_irq,
> >> unsigned int vintid);
> >>
> >> +struct kvm_kernel_irq_routing_entry;
> >> +
> >> +int kvm_vgic_v4_set_forwarding(struct kvm *kvm, int irq,
> >> + struct kvm_kernel_irq_routing_entry *irq_entry);
> >> +
> >> +int kvm_vgic_v4_unset_forwarding(struct kvm *kvm, int irq,
> >> + struct kvm_kernel_irq_routing_entry *irq_entry);
> >> +
> >> #endif /* __KVM_ARM_VGIC_H */
> >> diff --git a/virt/kvm/arm/arm.c b/virt/kvm/arm/arm.c
> >> index ebab6c29e3be..6803ea27c47d 100644
> >> --- a/virt/kvm/arm/arm.c
> >> +++ b/virt/kvm/arm/arm.c
> >> @@ -1457,11 +1457,16 @@ int kvm_arch_irq_bypass_add_producer(struct irq_bypass_consumer *cons,
> >> struct kvm_kernel_irqfd *irqfd =
> >> container_of(cons, struct kvm_kernel_irqfd, consumer);
> >>
> >> - if (prod->type != IRQ_BYPASS_VFIO_PLATFORM)
> >> + switch (prod->type) {
> >> + case IRQ_BYPASS_VFIO_PLATFORM:
> >> + return kvm_vgic_set_forwarding(irqfd->kvm, prod->irq,
> >> + irqfd->gsi + VGIC_NR_PRIVATE_IRQS);
> >> + case IRQ_BYPASS_VFIO_PCI_MSI:
> >> + return kvm_vgic_v4_set_forwarding(irqfd->kvm, prod->irq,
> >> + &irqfd->irq_entry);
> >> + default:
> >> return 0;
> >> -
> >> - return kvm_vgic_set_forwarding(irqfd->kvm, prod->irq,
> >> - irqfd->gsi + VGIC_NR_PRIVATE_IRQS);
> >> + }
> >> }
> >> void kvm_arch_irq_bypass_del_producer(struct irq_bypass_consumer *cons,
> >> struct irq_bypass_producer *prod)
> >> @@ -1469,11 +1474,17 @@ void kvm_arch_irq_bypass_del_producer(struct irq_bypass_consumer *cons,
> >> struct kvm_kernel_irqfd *irqfd =
> >> container_of(cons, struct kvm_kernel_irqfd, consumer);
> >>
> >> - if (prod->type != IRQ_BYPASS_VFIO_PLATFORM)
> >> - return;
> >> + switch (prod->type) {
> >> + case IRQ_BYPASS_VFIO_PLATFORM:
> >> + kvm_vgic_unset_forwarding(irqfd->kvm, prod->irq,
> >> + irqfd->gsi + VGIC_NR_PRIVATE_IRQS);
> >> + break;
> >>
> >> - kvm_vgic_unset_forwarding(irqfd->kvm, prod->irq,
> >> - irqfd->gsi + VGIC_NR_PRIVATE_IRQS);
> >> + case IRQ_BYPASS_VFIO_PCI_MSI:
> >> + kvm_vgic_v4_unset_forwarding(irqfd->kvm, prod->irq,
> >> + &irqfd->irq_entry);
> >> + break;
> >> + }
> >> }
> >>
> >> void kvm_arch_irq_bypass_stop(struct irq_bypass_consumer *cons)
> >> diff --git a/virt/kvm/arm/vgic/vgic-v4.c b/virt/kvm/arm/vgic/vgic-v4.c
> >> index 207e1fda0dcd..338c86c5159f 100644
> >> --- a/virt/kvm/arm/vgic/vgic-v4.c
> >> +++ b/virt/kvm/arm/vgic/vgic-v4.c
> >> @@ -72,3 +72,106 @@ void vgic_v4_teardown(struct kvm *kvm)
> >> its_vm->nr_vpes = 0;
> >> its_vm->vpes = NULL;
> >> }
> >> +
> >> +static struct vgic_its *vgic_get_its(struct kvm *kvm,
> >> + struct kvm_kernel_irq_routing_entry *irq_entry)
> >> +{
> >> + struct kvm_msi msi = (struct kvm_msi) {
> >> + .address_lo = irq_entry->msi.address_lo,
> >> + .address_hi = irq_entry->msi.address_hi,
> >> + .data = irq_entry->msi.data,
> >> + .flags = irq_entry->msi.flags,
> >> + .devid = irq_entry->msi.devid,
> >> + };
> >> +
> >> + /*
> >> + * Get a reference on the LPI. If NULL, this is not a valid
> >> + * translation for any of our vITSs.
> >> + */
> >> + return vgic_msi_to_its(kvm, &msi);
> >> +}
> >> +
> >> +int kvm_vgic_v4_set_forwarding(struct kvm *kvm, int virq,
> >> + struct kvm_kernel_irq_routing_entry *irq_entry)
> >> +{
> >> + struct vgic_its *its;
> >> + struct vgic_irq *irq;
> >> + struct its_vlpi_map map;
> >> + int ret;
> >> +
> >> + if (!vgic_is_v4_capable(kvm))
> >> + return 0;
> >> +
> >> + /*
> >> + * Get the ITS, and escape early on error (not a valid
> >> + * doorbell for any of our vITSs).
> >> + */
> >> + its = vgic_get_its(kvm, irq_entry);
> >> + if (IS_ERR(its))
> >> + return 0;
> >> +
> >> + mutex_lock(&its->its_lock);
> >> +
> >> + /* Perform then actual DevID/EventID -> LPI translation. */
> >> + ret = vgic_its_resolve_lpi(kvm, its, irq_entry->msi.devid,
> >> + irq_entry->msi.data, &irq);
> >> + if (ret)
> >> + goto out;
> >> +
> >> + /*
> >> + * Emit the mapping request. If it fails, the ITS probably
> >> + * isn't v4 compatible, so let's silently bail out. Holding
> >> + * the ITS lock should ensure that nothing can modify the
> >> + * target vcpu.
> >> + */
> >> + map = (struct its_vlpi_map) {
> >> + .vm = &kvm->arch.vgic.its_vm,
> >> + .vintid = irq->intid,
> >> + .db_enabled = true,
> >> + .vpe_idx = irq->target_vcpu->vcpu_id,
>
> This is just wrong. We cannot assume that the vcpu_id has anything to do
> with the vpe_idx. It happens to be the same thing now, but the two things
> should be clearly disconnected.
>
> I suggest the following (untested):
>
> diff --git a/virt/kvm/arm/vgic/vgic-v4.c b/virt/kvm/arm/vgic/vgic-v4.c
> index cf5d6e2de6b8..0146e004401a 100644
> --- a/virt/kvm/arm/vgic/vgic-v4.c
> +++ b/virt/kvm/arm/vgic/vgic-v4.c
> @@ -251,13 +251,27 @@ static void dump_routing(int virq, struct kvm_kernel_irq_routing_entry *irq_entr
>
> }
>
> +static int vgic_v4_vcpu_to_index(struct its_vm *its_vm, struct kvm_vcpu *vcpu)
> +{
> + int i;
> +
> + for (i = 0; i < its_vm->nr_vpes; i++) {
> + struct its_vpe *vpe = &vcpu->arch.vgic_cpu.vgic_v3.its_vpe;
> +
> + if (its_vm->vpes[i] == vpe)
> + return i;
> + }
> +
> + return -ENODEV;
> +}
> +
Stupid question: Can we change the struct its_vlpi_map to contain a
vpe pointer or in stead of or in addition to the index?
Alternatively, can you look it up using
vcpu->arch.vgic_cpu.vgic_v3.its_vpe.irq() and another 'ioctl' in
irq_set_vcpu_affinity() somehow instead of looping around and testing?
> int kvm_vgic_v4_set_forwarding(struct kvm *kvm, int virq,
> struct kvm_kernel_irq_routing_entry *irq_entry)
> {
> struct vgic_its *its;
> struct vgic_irq *irq;
> struct its_vlpi_map map;
> - int ret;
> + int ret, idx;
>
> dump_routing(virq, irq_entry, true);
>
> @@ -280,6 +294,11 @@ int kvm_vgic_v4_set_forwarding(struct kvm *kvm, int virq,
> if (ret)
> goto out;
>
> + idx = vgic_v4_vcpu_to_index(&kvm->arch.vgic.its_vm,
> + irq->target_vcpu);
> + if (idx < 0)
> + goto out;
> +
> /*
> * Emit the mapping request. If it fails, the ITS probably
> * isn't v4 compatible, so let's silently bail out. Holding
> @@ -290,7 +309,7 @@ int kvm_vgic_v4_set_forwarding(struct kvm *kvm, int virq,
> .vm = &kvm->arch.vgic.its_vm,
> .vintid = irq->intid,
> .db_enabled = true,
> - .vpe_idx = irq->target_vcpu->vcpu_id,
> + .vpe_idx = idx,
> };
>
> if (its_map_vlpi(virq, &map))
>
> Another option would be to just pass the pointer to the vpe instead,
> and let the irq code to figure out the index, which can easily be
> derived the doorbells (vpe->vpe_db_lpi - vpe->its_vm->db_lpi_base).
>
> I'll work something out for the next version.
Ah, yeah, so I guess that is an option.
It should be pretty quick to loop over even hundreds of vcpus, but that
kind of thing just always seems wrong, somehow.
Thanks,
-Christoffer
next prev parent reply other threads:[~2017-08-30 11:46 UTC|newest]
Thread overview: 118+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-07-31 17:25 [PATCH v3 00/59] irqchip: KVM: Add support for GICv4 Marc Zyngier
2017-07-31 17:25 ` [PATCH v3 01/59] genirq: Let irq_set_vcpu_affinity() iterate over hierarchy Marc Zyngier
2017-07-31 17:25 ` [PATCH v3 02/59] irqchip/gic-v3: Add redistributor iterator Marc Zyngier
2017-07-31 17:25 ` [PATCH v3 03/59] irqchip/gic-v3: Add VLPI/DirectLPI discovery Marc Zyngier
2017-07-31 17:25 ` [PATCH v3 04/59] irqchip/gic-v3-its: Move LPI definitions around Marc Zyngier
2017-07-31 17:25 ` [PATCH v3 05/59] irqchip/gic-v3-its: Add probing for VLPI properties Marc Zyngier
2017-07-31 17:25 ` [PATCH v3 06/59] irqchip/gic-v3-its: Macro-ize its_send_single_command Marc Zyngier
2017-07-31 17:25 ` [PATCH v3 07/59] irqchip/gic-v3-its: Implement irq_set_irqchip_state for pending state Marc Zyngier
2017-07-31 17:25 ` [PATCH v3 08/59] irqchip/gic-v3-its: Split out property table allocation Marc Zyngier
2017-07-31 17:25 ` [PATCH v3 09/59] irqchip/gic-v3-its: Allow use of indirect VCPU tables Marc Zyngier
2017-07-31 17:25 ` [PATCH v3 10/59] irqchip/gic-v3-its: Split out pending table allocation Marc Zyngier
2017-07-31 17:25 ` [PATCH v3 11/59] irqchip/gic-v3-its: Rework LPI freeing Marc Zyngier
2017-07-31 17:25 ` [PATCH v3 12/59] irqchip/gic-v3-its: Generalize device table allocation Marc Zyngier
2017-07-31 17:25 ` [PATCH v3 13/59] irqchip/gic-v3-its: Generalize LPI configuration Marc Zyngier
2017-07-31 17:25 ` [PATCH v3 14/59] irqchip/gic-v4: Add management structure definitions Marc Zyngier
2017-07-31 17:25 ` [PATCH v3 15/59] irqchip/gic-v3-its: Add GICv4 ITS command definitions Marc Zyngier
2017-07-31 17:25 ` [PATCH v3 16/59] irqchip/gic-v3-its: Add VLPI configuration hook Marc Zyngier
2017-07-31 17:25 ` [PATCH v3 17/59] irqchip/gic-v3-its: Add VLPI map/unmap operations Marc Zyngier
2017-07-31 17:25 ` [PATCH v3 18/59] irqchip/gic-v3-its: Add VLPI configuration handling Marc Zyngier
2017-07-31 17:25 ` [PATCH v3 19/59] irqchip/gic-v3-its: Add VPE domain infrastructure Marc Zyngier
2017-07-31 17:25 ` [PATCH v3 20/59] irqchip/gic-v3-its: Add VPE irq domain allocation/teardown Marc Zyngier
2017-07-31 17:25 ` [PATCH v3 21/59] irqchip/gic-v3-its: Add VPE irq domain [de]activation Marc Zyngier
2017-07-31 17:26 ` [PATCH v3 22/59] irqchip/gic-v3-its: Add VPENDBASER/VPROPBASER accessors Marc Zyngier
2017-07-31 17:26 ` [PATCH v3 23/59] irqchip/gic-v3-its: Add VPE scheduling Marc Zyngier
2017-07-31 17:26 ` [PATCH v3 24/59] irqchip/gic-v3-its: Add VPE invalidation hook Marc Zyngier
2017-07-31 17:26 ` [PATCH v3 25/59] irqchip/gic-v3-its: Add VPE affinity changes Marc Zyngier
2017-07-31 17:26 ` [PATCH v3 26/59] irqchip/gic-v3-its: Add VPE interrupt masking Marc Zyngier
2017-07-31 17:26 ` [PATCH v3 27/59] irqchip/gic-v3-its: Support VPE doorbell invalidation even when !DirectLPI Marc Zyngier
2017-07-31 17:26 ` [PATCH v3 28/59] irqchip/gic-v3-its: Allow doorbell interrupts to be injected/cleared Marc Zyngier
2017-07-31 17:26 ` [PATCH v3 29/59] irqchip/gic-v3-its: Set implementation defined bit to enable VLPIs Marc Zyngier
2017-07-31 17:26 ` [PATCH v3 30/59] irqchip/gic-v4: Add per-VM VPE domain creation Marc Zyngier
2017-07-31 17:26 ` [PATCH v3 31/59] irqchip/gic-v4: Add VPE command interface Marc Zyngier
2017-07-31 17:26 ` [PATCH v3 32/59] irqchip/gic-v4: Add VLPI configuration interface Marc Zyngier
2017-07-31 17:26 ` [PATCH v3 33/59] irqchip/gic-v4: Add some basic documentation Marc Zyngier
2017-07-31 17:26 ` [PATCH v3 34/59] irqchip/gic-v4: Enable low-level GICv4 operations Marc Zyngier
2017-07-31 17:26 ` [PATCH v3 35/59] irqchip/gic-v3: Advertise GICv4 support to KVM Marc Zyngier
2017-07-31 17:26 ` [PATCH v3 36/59] KVM: arm: Select ARM_GIC_V3 and ARM_GIC_V3_ITS Marc Zyngier
2017-08-26 19:49 ` Christoffer Dall
2017-07-31 17:26 ` [PATCH v3 37/59] KVM: arm/arm64: vgic: Move kvm_vgic_destroy call around Marc Zyngier
2017-08-26 19:49 ` Christoffer Dall
2017-07-31 17:26 ` [PATCH v3 38/59] KVM: arm/arm64: vITS: Add MSI translation helpers Marc Zyngier
2017-08-26 19:49 ` Christoffer Dall
2017-07-31 17:26 ` [PATCH v3 39/59] KVM: arm/arm64: GICv4: Add property field and per-VM predicate Marc Zyngier
2017-08-26 19:49 ` Christoffer Dall
2017-08-30 9:46 ` Marc Zyngier
2017-07-31 17:26 ` [PATCH v3 40/59] KVM: arm/arm64: GICv4: Add init/teardown of the per-VM vPE irq domain Marc Zyngier
2017-08-26 19:49 ` Christoffer Dall
2017-08-30 9:50 ` Marc Zyngier
2017-07-31 17:26 ` [PATCH v3 41/59] KVM: arm/arm64: GICv4: Wire mapping/unmapping of VLPIs in VFIO irq bypass Marc Zyngier
2017-08-26 19:48 ` Christoffer Dall
2017-08-30 9:42 ` Marc Zyngier
2017-08-30 10:20 ` Auger Eric
2017-08-30 10:42 ` Marc Zyngier
2017-08-30 12:54 ` Auger Eric
2017-08-30 10:28 ` Marc Zyngier
2017-08-30 11:46 ` Christoffer Dall [this message]
2017-08-30 12:53 ` Marc Zyngier
2017-08-30 19:59 ` Christoffer Dall
2017-08-31 10:24 ` Marc Zyngier
2017-08-31 12:36 ` Christoffer Dall
2017-07-31 17:26 ` [PATCH v3 42/59] KVM: arm/arm64: GICv4: Handle INT command applied to a VLPI Marc Zyngier
2017-08-28 18:18 ` Christoffer Dall
2017-07-31 17:26 ` [PATCH v3 43/59] KVM: arm/arm64: GICv4: Unmap VLPI when freeing an LPI Marc Zyngier
2017-08-28 18:18 ` Christoffer Dall
2017-08-30 11:03 ` Marc Zyngier
2017-07-31 17:26 ` [PATCH v3 44/59] KVM: arm/arm64: GICv4: Handle MOVI applied to a VLPI Marc Zyngier
2017-08-28 18:18 ` Christoffer Dall
2017-08-30 14:08 ` Marc Zyngier
2017-08-30 20:04 ` Christoffer Dall
2017-07-31 17:26 ` [PATCH v3 45/59] KVM: arm/arm64: GICv4: Handle CLEAR " Marc Zyngier
2017-08-28 18:18 ` Christoffer Dall
2017-07-31 17:26 ` [PATCH v3 46/59] KVM: arm/arm64: GICv4: Handle MOVALL applied to a vPE Marc Zyngier
2017-08-28 18:18 ` Christoffer Dall
2017-08-30 14:46 ` Marc Zyngier
2017-08-30 20:10 ` Christoffer Dall
2017-07-31 17:26 ` [PATCH v3 47/59] KVM: arm/arm64: GICv4: Propagate property updates to VLPIs Marc Zyngier
2017-08-28 18:18 ` Christoffer Dall
2017-07-31 17:26 ` [PATCH v3 48/59] KVM: arm/arm64: GICv4: Handle INVALL applied to a vPE Marc Zyngier
2017-08-28 18:18 ` Christoffer Dall
2017-07-31 17:26 ` [PATCH v3 49/59] KVM: arm/arm64: GICv4: Propagate VLPI properties at map time Marc Zyngier
2017-08-28 18:18 ` Christoffer Dall
2017-08-30 14:56 ` Marc Zyngier
2017-08-30 20:12 ` Christoffer Dall
2017-07-31 17:26 ` [PATCH v3 50/59] KVM: arm/arm64: GICv4: Use pending_last as a scheduling hint Marc Zyngier
2017-08-28 18:18 ` Christoffer Dall
2017-07-31 17:26 ` [PATCH v3 51/59] KVM: arm/arm64: GICv4: Add doorbell interrupt handling Marc Zyngier
2017-08-04 7:44 ` Marc Zyngier
2017-08-28 18:18 ` Christoffer Dall
2017-08-30 10:31 ` Andrew Jones
2017-08-30 11:55 ` Christoffer Dall
2017-08-30 12:28 ` Andrew Jones
2017-08-31 12:18 ` Marc Zyngier
2017-08-31 12:41 ` Christoffer Dall
2017-08-28 18:18 ` Christoffer Dall
2017-08-30 15:36 ` Marc Zyngier
2017-08-30 20:58 ` Christoffer Dall
2017-08-31 8:19 ` Marc Zyngier
2017-09-06 9:06 ` Shannon Zhao
2017-07-31 17:26 ` [PATCH v3 52/59] KVM: arm/arm64: GICv4: Use the doorbell interrupt as an unblocking source Marc Zyngier
2017-08-28 18:19 ` Christoffer Dall
2017-07-31 17:26 ` [PATCH v3 53/59] KVM: arm/arm64: GICv4: Hook vPE scheduling into vgic flush/sync Marc Zyngier
2017-08-28 18:17 ` Christoffer Dall
2017-08-30 9:59 ` Marc Zyngier
2017-08-30 11:56 ` Christoffer Dall
2017-07-31 17:26 ` [PATCH v3 54/59] KVM: arm/arm64: GICv4: Enable virtual cpuif if VLPIs can be delivered Marc Zyngier
2017-08-28 18:20 ` Christoffer Dall
2017-07-31 17:26 ` [PATCH v3 55/59] KVM: arm/arm64: GICv4: Enable VLPI support Marc Zyngier
2017-08-28 18:25 ` Christoffer Dall
2017-07-31 17:26 ` [PATCH v3 56/59] KVM: arm/arm64: GICv4: Prevent heterogenous systems from using GICv4 Marc Zyngier
2017-08-28 18:35 ` Christoffer Dall
2017-08-30 16:03 ` Marc Zyngier
2017-08-30 21:00 ` Christoffer Dall
2017-07-31 17:26 ` [PATCH v3 57/59] KVM: arm/arm64: GICv4: Theory of operations Marc Zyngier
2017-08-28 18:18 ` Christoffer Dall
2017-08-30 11:30 ` Marc Zyngier
2017-08-30 11:58 ` Christoffer Dall
2017-07-31 17:26 ` [PATCH v3 58/59] irqchip/gic-v3-its: Pass its_node pointer to each command bulder Marc Zyngier
2017-07-31 17:26 ` [PATCH v3 59/59] irqchip/gic-v3-its: Workaround Huawei D05 redistributor addressing Marc Zyngier
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