smmu: Clear SMMUPciBus pointer cache when system reset

s->smmu_pcibus_by_bus_num is a SMMUPciBus pointer cache indexed
by bus number, bus number may not always be a fixed value,
i.e., guest reboot to different kernel which set bus number with
different algorithm.

This could lead to smmu_iommu_mr() providing the wrong iommu MR.

Suggested-by: Eric Auger <eric.auger@redhat.com>
Signed-off-by: Zhenzhong Duan <zhenzhong.duan@intel.com>
Message-Id: <20240125073706.339369-3-zhenzhong.duan@intel.com>
Reviewed-by: Eric Auger <eric.auger@redhat.com>
Tested-by: Eric Auger <eric.auger@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

diff --git a/hw/arm/smmu-common.c b/hw/arm/smmu-common.c
index 9a8ac45431abb80fc5e9f60104248cb356509088..f58261bb81efd95b76d8f2bf311b676b15f175cd 100644 (file)
--- a/hw/arm/smmu-common.c
+++ b/hw/arm/smmu-common.c
@@ -675,6 +675,8 @@ static void smmu_base_reset_hold(Object *obj)
 {
     SMMUState *s = ARM_SMMU(obj);
 
+    memset(s->smmu_pcibus_by_bus_num, 0, sizeof(s->smmu_pcibus_by_bus_num));
+
     g_hash_table_remove_all(s->configs);
     g_hash_table_remove_all(s->iotlb);
 }