diff options
| author | Suravee Suthikulpanit <suravee.suthikulpanit@amd.com> | 2016-08-23 21:52:38 +0300 |
|---|---|---|
| committer | Joerg Roedel <jroedel@suse.de> | 2016-09-05 13:41:46 +0300 |
| commit | 8dbea3fd7becd4af8ca882c3132be4b1a857e301 (patch) | |
| tree | 08f9aaa6eab2d4139c69acf105b4d80de5c3a1d3 /drivers/iommu | |
| parent | bd6fcefc66f6d038406e38edf96a95d9842f819d (diff) | |
| download | linux-8dbea3fd7becd4af8ca882c3132be4b1a857e301.tar.xz | |
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>
Diffstat (limited to 'drivers/iommu')
| -rw-r--r-- | drivers/iommu/amd_iommu.c | 39 | ||||
| -rw-r--r-- | drivers/iommu/amd_iommu_types.h | 1 |
2 files changed, 40 insertions, 0 deletions
diff --git a/drivers/iommu/amd_iommu.c b/drivers/iommu/amd_iommu.c index eec37b2f54df..089e1ed4deec 100644 --- a/drivers/iommu/amd_iommu.c +++ b/drivers/iommu/amd_iommu.c @@ -4269,4 +4269,43 @@ int amd_iommu_create_irq_domain(struct amd_iommu *iommu) 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 8a7a93d40063..60018a8fb655 100644 --- a/drivers/iommu/amd_iommu_types.h +++ b/drivers/iommu/amd_iommu_types.h @@ -810,6 +810,7 @@ struct amd_ir_data { 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 { |