diff options
| -rw-r--r-- | drivers/iommu/amd/iommu.c | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/drivers/iommu/amd/iommu.c b/drivers/iommu/amd/iommu.c index 8366d32252cd..0a0d73483195 100644 --- a/drivers/iommu/amd/iommu.c +++ b/drivers/iommu/amd/iommu.c @@ -3986,6 +3986,18 @@ int amd_iommu_create_irq_domain(struct amd_iommu *iommu) return 0; } +/* + * Update the pCPU information for an IRTE that is configured to post IRQs to + * a vCPU, without issuing an IOMMU invalidation for the IRTE. + * + * This API is intended to be used when a vCPU is scheduled in/out (or stops + * running for any reason), to do a fast update of IsRun and (conditionally) + * Destination. + * + * Per the IOMMU spec, the Destination, IsRun, and GATag fields are not cached + * and thus don't require an invalidation to ensure the IOMMU consumes fresh + * information. + */ int amd_iommu_update_ga(int cpu, bool is_run, void *data) { struct amd_ir_data *ir_data = (struct amd_ir_data *)data; |