hw/arm/smmu-common: Support nested translation

When nested translation is requested, do the following:
- Translate stage-1 table address IPA into PA through stage-2.
- Translate stage-1 table walk output (IPA) through stage-2.
- Create a single TLB entry from stage-1 and stage-2 translations
  using logic introduced before.

smmu_ptw() has a new argument SMMUState which include the TLB as
stage-1 table address can be cached in there.

Also in smmu_ptw(), a separate path used for nesting to simplify the
code, although some logic can be combined.

With nested translation class of translation fault can be different,
from the class of the translation, as faults from translating stage-1
tables are considered as CLASS_TT and not CLASS_IN, a new member
"is_ipa_descriptor" added to "SMMUPTWEventInfo" to differ faults
from walking stage 1 translation table and faults from translating
an IPA for a transaction.

Signed-off-by: Mostafa Saleh <smostafa@google.com>
Reviewed-by: Jean-Philippe Brucker <jean-philippe@linaro.org>
Reviewed-by: Eric Auger <eric.auger@redhat.com>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Message-id: 20240715084519.1189624-12-smostafa@google.com
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

include/hw/arm/smmu-common.h

@@ -63,6 +63,7 @@ typedef struct SMMUPTWEventInfo {
     SMMUStage stage;
     SMMUPTWEventType type;
     dma_addr_t addr; /* fetched address that induced an abort, if any */
+    bool is_ipa_descriptor; /* src for fault in nested translation. */
 } SMMUPTWEventInfo;
 
 typedef struct SMMUTransTableInfo {
@@ -184,9 +185,9 @@ static inline uint16_t smmu_get_sid(SMMUDevice *sdev)
  * smmu_ptw - Perform the page table walk for a given iova / access flags
  * pair, according to @cfg translation config
  */
-int smmu_ptw(SMMUTransCfg *cfg, dma_addr_t iova, IOMMUAccessFlags perm,
-             SMMUTLBEntry *tlbe, SMMUPTWEventInfo *info);
-
+int smmu_ptw(SMMUState *bs, SMMUTransCfg *cfg, dma_addr_t iova,
+             IOMMUAccessFlags perm, SMMUTLBEntry *tlbe,
+             SMMUPTWEventInfo *info);
 
 /*
  * smmu_translate - Look for a translation in TLB, if not, do a PTW.