[PULL 41/53] intel-iommu: send UNMAP notifications for domain or global inv desc

["Michael S. Tsirkin" <mst@redhat.com>]

From: Peter Xu <peterx@redhat.com>

We don't send UNMAP notification upon domain or global invalidation
which will lead the notifier can't work correctly. One example is to
use vhost remote IOTLB without enabling device IOTLB.

Fixing this by sending UNMAP notification.

Signed-off-by: Peter Xu <peterx@redhat.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
Message-Id: <20230223065924.42503-6-jasowang@redhat.com>
Reviewed-by: Peter Xu <peterx@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
---
 hw/i386/intel_iommu.c | 14 +++++++++-----
 1 file changed, 9 insertions(+), 5 deletions(-)

diff --git a/hw/i386/intel_iommu.c b/hw/i386/intel_iommu.c
index a6b35b07d2..faade7def8 100644
--- a/hw/i386/intel_iommu.c
+++ b/hw/i386/intel_iommu.c
@@ -1530,13 +1530,17 @@ static int vtd_sync_shadow_page_table_range(VTDAddressSpace *vtd_as,
     return vtd_page_walk(s, ce, addr, addr + size, &info, vtd_as->pasid);
 }
 
-static int vtd_sync_shadow_page_table(VTDAddressSpace *vtd_as)
+static int vtd_address_space_sync(VTDAddressSpace *vtd_as)
 {
     int ret;
     VTDContextEntry ce;
     IOMMUNotifier *n;
 
-    if (!(vtd_as->iommu.iommu_notify_flags & IOMMU_NOTIFIER_IOTLB_EVENTS)) {
+    /* If no MAP notifier registered, we simply invalidate all the cache */
+    if (!vtd_as_has_map_notifier(vtd_as)) {
+        IOMMU_NOTIFIER_FOREACH(n, &vtd_as->iommu) {
+            memory_region_unmap_iommu_notifier_range(n);
+        }
         return 0;
     }
 
@@ -2000,7 +2004,7 @@ static void vtd_iommu_replay_all(IntelIOMMUState *s)
     VTDAddressSpace *vtd_as;
 
     QLIST_FOREACH(vtd_as, &s->vtd_as_with_notifiers, next) {
-        vtd_sync_shadow_page_table(vtd_as);
+        vtd_address_space_sync(vtd_as);
     }
 }
 
@@ -2082,7 +2086,7 @@ static void vtd_context_device_invalidate(IntelIOMMUState *s,
              * framework will skip MAP notifications if that
              * happened.
              */
-            vtd_sync_shadow_page_table(vtd_as);
+            vtd_address_space_sync(vtd_as);
         }
     }
 }
@@ -2140,7 +2144,7 @@ static void vtd_iotlb_domain_invalidate(IntelIOMMUState *s, uint16_t domain_id)
         if (!vtd_dev_to_context_entry(s, pci_bus_num(vtd_as->bus),
                                       vtd_as->devfn, &ce) &&
             domain_id == vtd_get_domain_id(s, &ce, vtd_as->pasid)) {
-            vtd_sync_shadow_page_table(vtd_as);
+            vtd_address_space_sync(vtd_as);
         }
     }
 }
-- 
MST