intel_iommu: Replay all pasid bindings when either SRTP or TE bit is changed

When either 'Set Root Table Pointer' or 'Translation Enable' bit is changed,
all pasid bindings on host side become stale and need to be updated.

Introduce a helper function vtd_replay_pasid_bindings_all() to go through all
pasid entries in all passthrough devices to update host side bindings.

Signed-off-by: Yi Liu <yi.l.liu@intel.com>
Signed-off-by: Zhenzhong Duan <zhenzhong.duan@intel.com>
Reviewed-by: Eric Auger <eric.auger@redhat.com>
Reviewed-by: Yi Liu <yi.l.liu@intel.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Link: https://lore.kernel.org/qemu-devel/20260106061304.314546-16-zhenzhong.duan@intel.com
Signed-off-by: Cédric Le Goater <clg@redhat.com>

diff --git a/hw/i386/intel_iommu.c b/hw/i386/intel_iommu.c
index 2889c29102b1c487f760906e4038274491da1a44..3241af811c4313e22864a0c2fbb2d83b89208541 100644 (file)
--- a/hw/i386/intel_iommu.c
+++ b/hw/i386/intel_iommu.c
@@ -76,6 +76,7 @@ struct vtd_iotlb_key {
 
 static void vtd_address_space_refresh_all(IntelIOMMUState *s);
 static void vtd_address_space_unmap(VTDAddressSpace *as, IOMMUNotifier *n);
+static void vtd_replay_pasid_bindings_all(IntelIOMMUState *s);
 
 static void vtd_pasid_cache_reset_locked(IntelIOMMUState *s)
 {
@@ -2629,6 +2630,7 @@ static void vtd_handle_gcmd_srtp(IntelIOMMUState *s)
     vtd_set_clear_mask_long(s, DMAR_GSTS_REG, 0, VTD_GSTS_RTPS);
     vtd_reset_caches(s);
     vtd_address_space_refresh_all(s);
+    vtd_replay_pasid_bindings_all(s);
 }
 
 /* Set Interrupt Remap Table Pointer */
@@ -2663,6 +2665,7 @@ static void vtd_handle_gcmd_te(IntelIOMMUState *s, bool en)
 
     vtd_reset_caches(s);
     vtd_address_space_refresh_all(s);
+    vtd_replay_pasid_bindings_all(s);
 }
 
 /* Handle Interrupt Remap Enable/Disable */
@@ -3162,6 +3165,13 @@ static void vtd_pasid_cache_sync(IntelIOMMUState *s, VTDPASIDCacheInfo *pc_info)
     vtd_iommu_unlock(s);
 }
 
+static void vtd_replay_pasid_bindings_all(IntelIOMMUState *s)
+{
+    VTDPASIDCacheInfo pc_info = { .type = VTD_INV_DESC_PASIDC_G_GLOBAL };
+
+    vtd_pasid_cache_sync(s, &pc_info);
+}
+
 static bool vtd_process_pasid_desc(IntelIOMMUState *s,
                                    VTDInvDesc *inv_desc)
 {