From: Marc Zyngier <marc.zyngier@arm.com>
To: Christoffer Dall <cdall@linaro.org>
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 10:42:58 +0100 [thread overview]
Message-ID: <53116ae6-fd94-2687-740f-5917e158eda7@arm.com> (raw)
In-Reply-To: <20170826194850.GB11074@cbox>
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,
>> + };
>> +
>> + if (its_map_vlpi(virq, &map))
>> + goto out;
>
> This seems to be able to return things like -ENOMEM, whould we really
> not report this back to the caller in any way?
That's a good question.
If we return -ENOMEM, we'll probably end-up returning an error to
userspace (as a result of the VFIO ioctl), which will in turn probably
terminate the guest (I'm guessing, I haven't actually looked at what
userspace does).
If we don't return the error, then we have a chance to keep the guest
running by sticking to software injection.
I'm not sure what is preferable...
Thanks,
M.
--
Jazz is not dead. It just smells funny...
next prev parent reply other threads:[~2017-08-30 9:43 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 [this message]
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
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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