A replay() method is necessary to efficiently synchronize the host page
tables after VFIO registers a notifier for IOMMU events. It is called to
ensure that existing mappings from an IOMMU memory region are "replayed" to
a specified notifier, initializing or updating the shadow page tables on the
host.
Signed-off-by: Alejandro Jimenez <alejandro.j.jime...@oracle.com>
---
hw/i386/amd_iommu.c | 24 ++++++++++++++++++++++++
1 file changed, 24 insertions(+)
diff --git a/hw/i386/amd_iommu.c b/hw/i386/amd_iommu.c
index 7bcba47a01ba..5ce74f2c052d 100644
--- a/hw/i386/amd_iommu.c
+++ b/hw/i386/amd_iommu.c
@@ -879,6 +879,29 @@ static void amdvi_address_space_unmap_all(AMDVIState *s)
}
}
+/*
+ * For every translation present in the IOMMU, construct IOMMUTLBEntry data
+ * and pass it as parameter to notifier callback.
+ */
+static void amdvi_iommu_replay(IOMMUMemoryRegion *iommu_mr, IOMMUNotifier *n)
+{
+ AMDVIAddressSpace *as = container_of(iommu_mr, AMDVIAddressSpace, iommu);
+ uint64_t dte[4] = { 0 };
+
+ if (!(n->notifier_flags & IOMMU_NOTIFIER_MAP)) {
+ return;
+ }
+
+ if (amdvi_as_to_dte(as, dte)) {
+ return;
+ }
+
+ /* Dropping all mappings for the address space. Also clears the IOVA tree
*/
+ amdvi_address_space_unmap(as, n);
+
+ amdvi_sync_shadow_page_table_range(as, &dte[0], 0, UINT64_MAX, false);
+}
+
/* log error without aborting since linux seems to be using reserved bits */
static void amdvi_inval_devtab_entry(AMDVIState *s, uint64_t *cmd)
{
@@ -2240,6 +2263,7 @@ static void
amdvi_iommu_memory_region_class_init(ObjectClass *klass,
imrc->translate = amdvi_translate;
imrc->notify_flag_changed = amdvi_iommu_notify_flag_changed;
+ imrc->replay = amdvi_iommu_replay;
}
static const TypeInfo amdvi_iommu_memory_region_info = {
--
2.43.5
