2016-07-11 05:11-0500, Suravee Suthikulpanit:
> From: Suravee Suthikulpanit <Suravee.Suthikulpanit@xxxxxxx>
>
> This patch adds AMD IOMMU guest virtual APIC log (GALOG) handler.
> When IOMMU hardware receives an interrupt targeting a blocking vcpu,
> it creates an entry in the GALOG, and generates an interrupt to notify
> the AMD IOMMU driver.
>
> At this point, the driver processes the log entry, and notify the SVM
> driver via the registered iommu_ga_log_notifier function.
>
> Signed-off-by: Suravee Suthikulpanit <Suravee.Suthikulpanit@xxxxxxx>
> ---
> diff --git a/drivers/iommu/amd_iommu.c b/drivers/iommu/amd_iommu.c
> @@ -741,14 +741,101 @@ static void iommu_poll_ppr_log(struct amd_iommu *iommu)
> +static void iommu_handle_ga_guest_nr_entry(struct amd_iommu *iommu,
> + u16 devid, u32 ga_tag)
> +{
> + struct amd_ir_data *ir_data;
> + unsigned long flags;
> + int vec = 0;
> +
> + if (!iommu_ga_log_notifier)
> + return;
> +
> + spin_lock_irqsave(&iommu->ga_hash_lock, flags);
> + hash_for_each_possible(iommu->ga_hash, ir_data, hnode, ga_tag) {
> + struct irte_ga *entry = (struct irte_ga *)ir_data->entry;
if (ga_tag != entry->fields_vapic.ga_tag)
continue;
Multiple different ga_tags can map to the same bucket, so we need to
explicitly select the correct entry.
> +
> + vec = entry->hi.fields.vector;
> + break;
> + }
> + spin_unlock_irqrestore(&iommu->ga_hash_lock, flags);
> +
> + if (vec) {
> + pr_debug("AMD-Vi: %s: devid=%#x, ga_tag=%#x\n",
> + __func__, devid, ga_tag);
> +
> + if (iommu_ga_log_notifier(GATAG_TO_AVICTAG(ga_tag),
> + GATAG_TO_VCPUID(ga_tag), vec) != 0)
--
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