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[RFC,v8,08/28] memory: Introduce IOMMU Memory Region inject_faults API

Message ID 20210225105233.650545-9-eric.auger@redhat.com
State New
Headers show
Series vSMMUv3/pSMMUv3 2 stage VFIO integration | expand

Commit Message

Eric Auger Feb. 25, 2021, 10:52 a.m. UTC 
This new API allows to inject @count iommu_faults into
the IOMMU memory region.

Signed-off-by: Eric Auger <eric.auger@redhat.com>
---
 include/exec/memory.h | 24 ++++++++++++++++++++++++
 softmmu/memory.c      | 10 ++++++++++
 2 files changed, 34 insertions(+)
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Patch

diff --git a/include/exec/memory.h b/include/exec/memory.h
index ad6c807262..0c4389c383 100644
--- a/include/exec/memory.h
+++ b/include/exec/memory.h
@@ -65,6 +65,8 @@  struct ReservedRegion {
     unsigned type;
 };
 
+struct iommu_fault;
+
 typedef struct IOMMUTLBEntry IOMMUTLBEntry;
 
 /* See address_space_translate: bit 0 is read, bit 1 is write.  */
@@ -475,6 +477,19 @@  struct IOMMUMemoryRegionClass {
      int (*iommu_set_page_size_mask)(IOMMUMemoryRegion *iommu,
                                      uint64_t page_size_mask,
                                      Error **errp);
+
+    /*
+     * Inject @count faults into the IOMMU memory region
+     *
+     * Optional method: if this method is not provided, then
+     * memory_region_injection_faults() will return -ENOENT
+     *
+     * @iommu: the IOMMU memory region to inject the faults in
+     * @count: number of faults to inject
+     * @buf: fault buffer
+     */
+    int (*inject_faults)(IOMMUMemoryRegion *iommu, int count,
+                         struct iommu_fault *buf);
 };
 
 typedef struct CoalescedMemoryRange CoalescedMemoryRange;
@@ -1496,6 +1511,15 @@  int memory_region_iommu_num_indexes(IOMMUMemoryRegion *iommu_mr);
 int memory_region_iommu_set_page_size_mask(IOMMUMemoryRegion *iommu_mr,
                                            uint64_t page_size_mask,
                                            Error **errp);
+/**
+ * memory_region_inject_faults : inject @count faults stored in @buf
+ *
+ * @iommu_mr: the IOMMU memory region
+ * @count: number of faults to be injected
+ * @buf: buffer containing the faults
+ */
+int memory_region_inject_faults(IOMMUMemoryRegion *iommu_mr, int count,
+                                struct iommu_fault *buf);
 
 /**
  * memory_region_name: get a memory region's name
diff --git a/softmmu/memory.c b/softmmu/memory.c
index 874a8fccde..c3f2c562f7 100644
--- a/softmmu/memory.c
+++ b/softmmu/memory.c
@@ -2029,6 +2029,16 @@  int memory_region_iommu_num_indexes(IOMMUMemoryRegion *iommu_mr)
     return imrc->num_indexes(iommu_mr);
 }
 
+int memory_region_inject_faults(IOMMUMemoryRegion *iommu_mr, int count,
+                                struct iommu_fault *buf)
+{
+    IOMMUMemoryRegionClass *imrc = IOMMU_MEMORY_REGION_GET_CLASS(iommu_mr);
+    if (!imrc->inject_faults) {
+        return -ENOENT;
+    }
+    return imrc->inject_faults(iommu_mr, count, buf);
+}
+
 void memory_region_set_log(MemoryRegion *mr, bool log, unsigned client)
 {
     uint8_t mask = 1 << client;