iommu/amd: Introduce amd_iommu_update_ga()
Introduces a new IOMMU API, amd_iommu_update_ga(), which allows
KVM (SVM) to update existing posted interrupt IOMMU IRTE when
load/unload vcpu.
Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
diff --git a/drivers/iommu/amd_iommu.c b/drivers/iommu/amd_iommu.c
index eec37b2..089e1ed 100644
--- a/drivers/iommu/amd_iommu.c
+++ b/drivers/iommu/amd_iommu.c
@@ -4269,4 +4269,43 @@
return 0;
}
+
+int amd_iommu_update_ga(int cpu, bool is_run, void *data)
+{
+ unsigned long flags;
+ struct amd_iommu *iommu;
+ struct irq_remap_table *irt;
+ struct amd_ir_data *ir_data = (struct amd_ir_data *)data;
+ int devid = ir_data->irq_2_irte.devid;
+ struct irte_ga *entry = (struct irte_ga *) ir_data->entry;
+ struct irte_ga *ref = (struct irte_ga *) ir_data->ref;
+
+ if (!AMD_IOMMU_GUEST_IR_VAPIC(amd_iommu_guest_ir) ||
+ !ref || !entry || !entry->lo.fields_vapic.guest_mode)
+ return 0;
+
+ iommu = amd_iommu_rlookup_table[devid];
+ if (!iommu)
+ return -ENODEV;
+
+ irt = get_irq_table(devid, false);
+ if (!irt)
+ return -ENODEV;
+
+ spin_lock_irqsave(&irt->lock, flags);
+
+ if (ref->lo.fields_vapic.guest_mode) {
+ if (cpu >= 0)
+ ref->lo.fields_vapic.destination = cpu;
+ ref->lo.fields_vapic.is_run = is_run;
+ barrier();
+ }
+
+ spin_unlock_irqrestore(&irt->lock, flags);
+
+ iommu_flush_irt(iommu, devid);
+ iommu_completion_wait(iommu);
+ return 0;
+}
+EXPORT_SYMBOL(amd_iommu_update_ga);
#endif
diff --git a/drivers/iommu/amd_iommu_types.h b/drivers/iommu/amd_iommu_types.h
index 8a7a93d..60018a8 100644
--- a/drivers/iommu/amd_iommu_types.h
+++ b/drivers/iommu/amd_iommu_types.h
@@ -810,6 +810,7 @@
struct irq_2_irte irq_2_irte;
struct msi_msg msi_entry;
void *entry; /* Pointer to union irte or struct irte_ga */
+ void *ref; /* Pointer to the actual irte */
};
struct amd_irte_ops {