[RFC PATCH v3 11/18] hw/arm/smmu: Support nesting in smmuv3_range_inval()

[Mostafa Saleh]

With nesting, we would need to invalidate IPAs without
over-invalidating stage-1 IOVAs. This can be done by
distinguishing IPAs in the TLBs by having ASID=-1.
To achieve that, rework the invalidation for IPAs to have a
separate function, while for IOVA invalidation ASID=-1 means
invalidate for all ASIDs.

Signed-off-by: Mostafa Saleh <smostafa@google.com>
Reviewed-by: Eric Auger <eric.auger@redhat.com>
---
 hw/arm/smmu-common.c         | 47 ++++++++++++++++++++++++++++++++++++
 hw/arm/smmuv3.c              | 23 ++++++++++++------
 hw/arm/trace-events          |  2 +-
 include/hw/arm/smmu-common.h |  3 ++-
 4 files changed, 66 insertions(+), 9 deletions(-)

diff --git a/hw/arm/smmu-common.c b/hw/arm/smmu-common.c
index d48ec08947..fa2460cf64 100644
--- a/hw/arm/smmu-common.c
+++ b/hw/arm/smmu-common.c
@@ -183,6 +183,25 @@ static gboolean 
smmu_hash_remove_by_asid_vmid_iova(gpointer key, gpointer value,
            ((entry->iova & ~info->mask) == info->iova);
 }
 
+static gboolean smmu_hash_remove_by_vmid_ipa(gpointer key, gpointer value,
+                                             gpointer user_data)
+{
+    SMMUTLBEntry *iter = (SMMUTLBEntry *)value;
+    IOMMUTLBEntry *entry = &iter->entry;
+    SMMUIOTLBPageInvInfo *info = (SMMUIOTLBPageInvInfo *)user_data;
+    SMMUIOTLBKey iotlb_key = *(SMMUIOTLBKey *)key;
+
+    if (info->asid >= 0) {
+        /* This is a stage-1 address. */
+        return false;
+    }
+    if (info->vmid != SMMU_IOTLB_VMID(iotlb_key)) {
+        return false;
+    }
+    return ((info->iova & ~entry->addr_mask) == entry->iova) ||
+           ((entry->iova & ~info->mask) == info->iova);
+}
+
 void smmu_iotlb_inv_iova(SMMUState *s, int asid, int vmid, dma_addr_t iova,
                          uint8_t tg, uint64_t num_pages, uint8_t ttl)
 {
@@ -211,6 +230,34 @@ void smmu_iotlb_inv_iova(SMMUState *s, int asid, int vmid, 
dma_addr_t iova,
                                 &info);
 }
 
+/*
+ * Similar to smmu_iotlb_inv_iova(), but for Stage-2, ASID is always -1,
+ * in Stage-1 invalidation ASID = -1, means don't care.
+ */
+void smmu_iotlb_inv_ipa(SMMUState *s, int vmid, dma_addr_t ipa, uint8_t tg,
+                        uint64_t num_pages, uint8_t ttl)
+{
+    uint8_t granule = tg ? tg * 2 + 10 : 12;
+    int asid = -1;
+
+   if (ttl && (num_pages == 1)) {
+        SMMUIOTLBKey key = smmu_get_iotlb_key(asid, vmid, ipa, tg, ttl);
+
+        if (g_hash_table_remove(s->iotlb, &key)) {
+            return;
+        }
+    }
+
+    SMMUIOTLBPageInvInfo info = {
+        .iova = ipa,
+        .vmid = vmid,
+        .mask = (num_pages * 1 << granule) - 1};
+
+    g_hash_table_foreach_remove(s->iotlb,
+                                smmu_hash_remove_by_vmid_ipa,
+                                &info);
+}
+
 void smmu_iotlb_inv_asid(SMMUState *s, int asid)
 {
     trace_smmu_iotlb_inv_asid(asid);
diff --git a/hw/arm/smmuv3.c b/hw/arm/smmuv3.c
index cc61c82321..82d918d9b5 100644
--- a/hw/arm/smmuv3.c
+++ b/hw/arm/smmuv3.c
@@ -1118,7 +1118,7 @@ static void smmuv3_inv_notifiers_iova(SMMUState *s, int 
asid, int vmid,
     }
 }
 
-static void smmuv3_range_inval(SMMUState *s, Cmd *cmd)
+static void smmuv3_range_inval(SMMUState *s, Cmd *cmd, SMMUStage stage)
 {
     dma_addr_t end, addr = CMD_ADDR(cmd);
     uint8_t type = CMD_TYPE(cmd);
@@ -1143,9 +1143,13 @@ static void smmuv3_range_inval(SMMUState *s, Cmd *cmd)
     }
 
     if (!tg) {
-        trace_smmuv3_range_inval(vmid, asid, addr, tg, 1, ttl, leaf);
+        trace_smmuv3_range_inval(vmid, asid, addr, tg, 1, ttl, leaf, stage);
         smmuv3_inv_notifiers_iova(s, asid, vmid, addr, tg, 1);
-        smmu_iotlb_inv_iova(s, asid, vmid, addr, tg, 1, ttl);
+        if (stage == SMMU_STAGE_1) {
+            smmu_iotlb_inv_iova(s, asid, vmid, addr, tg, 1, ttl);
+        } else {
+            smmu_iotlb_inv_ipa(s, vmid, addr, tg, 1, ttl);
+        }
         return;
     }
 
@@ -1161,9 +1165,14 @@ static void smmuv3_range_inval(SMMUState *s, Cmd *cmd)
         uint64_t mask = dma_aligned_pow2_mask(addr, end, 64);
 
         num_pages = (mask + 1) >> granule;
-        trace_smmuv3_range_inval(vmid, asid, addr, tg, num_pages, ttl, leaf);
+        trace_smmuv3_range_inval(vmid, asid, addr, tg, num_pages,
+                                 ttl, leaf, stage);
         smmuv3_inv_notifiers_iova(s, asid, vmid, addr, tg, num_pages);
-        smmu_iotlb_inv_iova(s, asid, vmid, addr, tg, num_pages, ttl);
+        if (stage == SMMU_STAGE_1) {
+            smmu_iotlb_inv_iova(s, asid, vmid, addr, tg, num_pages, ttl);
+        } else {
+            smmu_iotlb_inv_ipa(s, vmid, addr, tg, num_pages, ttl);
+        }
         addr += mask + 1;
     }
 }
@@ -1322,7 +1331,7 @@ static int smmuv3_cmdq_consume(SMMUv3State *s)
                 cmd_error = SMMU_CERROR_ILL;
                 break;
             }
-            smmuv3_range_inval(bs, &cmd);
+            smmuv3_range_inval(bs, &cmd, SMMU_STAGE_1);
             break;
         case SMMU_CMD_TLBI_S12_VMALL:
         {
@@ -1347,7 +1356,7 @@ static int smmuv3_cmdq_consume(SMMUv3State *s)
              * As currently only either s1 or s2 are supported
              * we can reuse same function for s2.
              */
-            smmuv3_range_inval(bs, &cmd);
+            smmuv3_range_inval(bs, &cmd, SMMU_STAGE_2);
             break;
         case SMMU_CMD_TLBI_EL3_ALL:
         case SMMU_CMD_TLBI_EL3_VA:
diff --git a/hw/arm/trace-events b/hw/arm/trace-events
index 09ccd39548..7d9c1703da 100644
--- a/hw/arm/trace-events
+++ b/hw/arm/trace-events
@@ -46,7 +46,7 @@ smmuv3_cmdq_cfgi_ste_range(int start, int end) "start=0x%x - 
end=0x%x"
 smmuv3_cmdq_cfgi_cd(uint32_t sid) "sid=0x%x"
 smmuv3_config_cache_hit(uint32_t sid, uint32_t hits, uint32_t misses, uint32_t 
perc) "Config cache HIT for sid=0x%x (hits=%d, misses=%d, hit rate=%d)"
 smmuv3_config_cache_miss(uint32_t sid, uint32_t hits, uint32_t misses, 
uint32_t perc) "Config cache MISS for sid=0x%x (hits=%d, misses=%d, hit 
rate=%d)"
-smmuv3_range_inval(int vmid, int asid, uint64_t addr, uint8_t tg, uint64_t 
num_pages, uint8_t ttl, bool leaf) "vmid=%d asid=%d addr=0x%"PRIx64" tg=%d 
num_pages=0x%"PRIx64" ttl=%d leaf=%d"
+smmuv3_range_inval(int vmid, int asid, uint64_t addr, uint8_t tg, uint64_t 
num_pages, uint8_t ttl, bool leaf, int stage) "vmid=%d asid=%d addr=0x%"PRIx64" 
tg=%d num_pages=0x%"PRIx64" ttl=%d leaf=%d stage=%d"
 smmuv3_cmdq_tlbi_nh(void) ""
 smmuv3_cmdq_tlbi_nh_asid(int asid) "asid=%d"
 smmuv3_cmdq_tlbi_s12_vmid(int vmid) "vmid=%d"
diff --git a/include/hw/arm/smmu-common.h b/include/hw/arm/smmu-common.h
index cf0fd3ec74..de032fdfd1 100644
--- a/include/hw/arm/smmu-common.h
+++ b/include/hw/arm/smmu-common.h
@@ -216,7 +216,8 @@ void smmu_iotlb_inv_asid(SMMUState *s, int asid);
 void smmu_iotlb_inv_vmid(SMMUState *s, int vmid);
 void smmu_iotlb_inv_iova(SMMUState *s, int asid, int vmid, dma_addr_t iova,
                          uint8_t tg, uint64_t num_pages, uint8_t ttl);
-
+void smmu_iotlb_inv_ipa(SMMUState *s, int vmid, dma_addr_t ipa, uint8_t tg,
+                        uint64_t num_pages, uint8_t ttl);
 /* Unmap the range of all the notifiers registered to any IOMMU mr */
 void smmu_inv_notifiers_all(SMMUState *s);
 
-- 
2.44.0.769.g3c40516874-goog