[PATCH rfcv2 18/20] intel_iommu: Refresh pasid bind when either SRTP or TE bit is changed

[Zhenzhong Duan <zhenzhong.duan@intel.com>]

From: Yi Liu <yi.l.liu@intel.com>

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

Introduce a helper function vtd_refresh_pasid_bind() for that purpose.

Signed-off-by: Yi Liu <yi.l.liu@intel.com>
Signed-off-by: Zhenzhong Duan <zhenzhong.duan@intel.com>
---
 hw/i386/intel_iommu.c | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)

diff --git a/hw/i386/intel_iommu.c b/hw/i386/intel_iommu.c
index 8f7fb473f5..225e332132 100644
--- a/hw/i386/intel_iommu.c
+++ b/hw/i386/intel_iommu.c
@@ -89,6 +89,7 @@ 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_refresh_pasid_bind(IntelIOMMUState *s);
 
 static void vtd_pasid_cache_reset(IntelIOMMUState *s);
 static void vtd_pasid_cache_sync(IntelIOMMUState *s,
@@ -3366,6 +3367,7 @@ 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_refresh_pasid_bind(s);
 }
 
 /* Set Interrupt Remap Table Pointer */
@@ -3400,6 +3402,7 @@ static void vtd_handle_gcmd_te(IntelIOMMUState *s, bool en)
 
     vtd_reset_caches(s);
     vtd_address_space_refresh_all(s);
+    vtd_refresh_pasid_bind(s);
 }
 
 /* Handle Interrupt Remap Enable/Disable */
@@ -4109,6 +4112,28 @@ static void vtd_replay_guest_pasid_bindings(IntelIOMMUState *s,
     }
 }
 
+static void vtd_refresh_pasid_bind(IntelIOMMUState *s)
+{
+    VTDPASIDCacheInfo pc_info = { .error_happened = false,
+                                  .type = VTD_PASID_CACHE_GLOBAL_INV };
+
+    /*
+     * Only when dmar is enabled, should pasid bindings replayed,
+     * otherwise no need to replay.
+     */
+    if (!s->dmar_enabled) {
+        return;
+    }
+
+    if (!s->flts || !s->root_scalable) {
+        return;
+    }
+
+    vtd_iommu_lock(s);
+    vtd_replay_guest_pasid_bindings(s, &pc_info);
+    vtd_iommu_unlock(s);
+}
+
 /*
  * This function syncs the pasid bindings between guest and host.
  * It includes updating the pasid cache in vIOMMU and updating the
-- 
2.34.1