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 | 23 +++++++++++++++++++++++
1 file changed, 23 insertions(+)
diff --git a/hw/i386/amd_iommu.c b/hw/i386/amd_iommu.c
index cf83ac607064..e24eab34c9e0 100644
--- a/hw/i386/amd_iommu.c
+++ b/hw/i386/amd_iommu.c
@@ -1902,6 +1902,28 @@ static void amdvi_switch_address_space_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;
+ }
+
+ amdvi_address_space_unmap(as, n);
+
+ amdvi_sync_shadow_page_table_range(as, &dte[0], 0, UINT64_MAX, false);
+}
+
static AddressSpace *amdvi_host_dma_iommu(PCIBus *bus, void *opaque, int devfn)
{
char name[128];
@@ -2223,6 +2245,7 @@ static void
amdvi_iommu_memory_region_class_init(ObjectClass *klass, void *data)
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
