[PATCH v2 10/14] intel_iommu_accel: Handle PASID entry removal for system reset

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

When system level reset, DMA translation is turned off, all PASID
entries become stale and should be deleted.

vtd_hiod list is never accessed without BQL, so no need to guard with
iommu lock.

Signed-off-by: Zhenzhong Duan <zhenzhong.duan@intel.com>
---
 hw/i386/intel_iommu_accel.h |  5 +++++
 hw/i386/intel_iommu.c       |  2 ++
 hw/i386/intel_iommu_accel.c | 13 +++++++++++++
 3 files changed, 20 insertions(+)

diff --git a/hw/i386/intel_iommu_accel.h b/hw/i386/intel_iommu_accel.h
index c5981a23bf..1fb7ca0af6 100644
--- a/hw/i386/intel_iommu_accel.h
+++ b/hw/i386/intel_iommu_accel.h
@@ -28,6 +28,7 @@ void vtd_flush_host_piotlb_all_locked(IntelIOMMUState *s, uint16_t domain_id,
                                       uint32_t pasid, hwaddr addr,
                                       uint64_t npages, bool ih);
 void vtd_pasid_cache_sync_accel(IntelIOMMUState *s, VTDPASIDCacheInfo *pc_info);
+void vtd_pasid_cache_reset_accel(IntelIOMMUState *s);
 void vtd_iommu_ops_update_accel(PCIIOMMUOps *ops);
 #else
 static inline bool vtd_check_hiod_accel(IntelIOMMUState *s,
@@ -62,6 +63,10 @@ static inline void vtd_pasid_cache_sync_accel(IntelIOMMUState *s,
 {
 }
 
+static inline void vtd_pasid_cache_reset_accel(IntelIOMMUState *s)
+{
+}
+
 static inline void vtd_iommu_ops_update_accel(PCIIOMMUOps *ops)
 {
 }
diff --git a/hw/i386/intel_iommu.c b/hw/i386/intel_iommu.c
index 451ede7530..b022f3cb9e 100644
--- a/hw/i386/intel_iommu.c
+++ b/hw/i386/intel_iommu.c
@@ -391,6 +391,8 @@ static void vtd_reset_caches(IntelIOMMUState *s)
     vtd_reset_context_cache_locked(s);
     vtd_pasid_cache_reset_locked(s);
     vtd_iommu_unlock(s);
+
+    vtd_pasid_cache_reset_accel(s);
 }
 
 static uint64_t vtd_get_iotlb_gfn(hwaddr addr, uint32_t level)
diff --git a/hw/i386/intel_iommu_accel.c b/hw/i386/intel_iommu_accel.c
index 1e27c0feb8..e9e67eb1a0 100644
--- a/hw/i386/intel_iommu_accel.c
+++ b/hw/i386/intel_iommu_accel.c
@@ -511,6 +511,19 @@ void vtd_pasid_cache_sync_accel(IntelIOMMUState *s, VTDPASIDCacheInfo *pc_info)
     }
 }
 
+/* Fake a gloal pasid cache invalidation to remove all pasid cache entries */
+void vtd_pasid_cache_reset_accel(IntelIOMMUState *s)
+{
+    VTDPASIDCacheInfo pc_info = { .type = VTD_INV_DESC_PASIDC_G_GLOBAL };
+    VTDHostIOMMUDevice *vtd_hiod;
+    GHashTableIter as_it;
+
+    g_hash_table_iter_init(&as_it, s->vtd_host_iommu_dev);
+    while (g_hash_table_iter_next(&as_it, NULL, (void **)&vtd_hiod)) {
+        vtd_pasid_cache_invalidate(vtd_hiod, &pc_info);
+    }
+}
+
 static uint64_t vtd_get_host_iommu_quirks(uint32_t type,
                                           void *caps, uint32_t size)
 {
-- 
2.47.3