[PATCH v1 1/5] s390x/mmu: Add EDAT2 translation support

[David Hildenbrand <david@redhat.com>]

This only adds basic support to the DAT translation, but no EDAT2 support
for TCG. E.g., the gdbstub under kvm uses this function, too, to
translate virtual addresses.

Reviewed-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: David Hildenbrand <david@redhat.com>
---
 target/s390x/mmu_helper.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/target/s390x/mmu_helper.c b/target/s390x/mmu_helper.c
index 6b34c4c7b4..54f54137ec 100644
--- a/target/s390x/mmu_helper.c
+++ b/target/s390x/mmu_helper.c
@@ -120,6 +120,7 @@ static int mmu_translate_asce(CPUS390XState *env, target_ulong vaddr,
 {
     const bool edat1 = (env->cregs[0] & CR0_EDAT) &&
                        s390_has_feat(S390_FEAT_EDAT);
+    const bool edat2 = edat1 && s390_has_feat(S390_FEAT_EDAT_2);
     const int asce_tl = asce & ASCE_TABLE_LENGTH;
     const int asce_p = asce & ASCE_PRIVATE_SPACE;
     hwaddr gaddr = asce & ASCE_ORIGIN;
@@ -219,9 +220,17 @@ static int mmu_translate_asce(CPUS390XState *env, target_ulong vaddr,
         if ((entry & REGION_ENTRY_TT) != REGION_ENTRY_TT_REGION3) {
             return PGM_TRANS_SPEC;
         }
+        if (edat2 && (entry & REGION3_ENTRY_CR) && asce_p) {
+            return PGM_TRANS_SPEC;
+        }
         if (edat1 && (entry & REGION_ENTRY_P)) {
             *flags &= ~PAGE_WRITE;
         }
+        if (edat2 && (entry & REGION3_ENTRY_FC)) {
+            *raddr = (entry & REGION3_ENTRY_RFAA) |
+                     (vaddr & REGION3_ENTRY_RFAA);
+            return 0;
+        }
         if (VADDR_SEGMENT_TL(vaddr) < (entry & REGION_ENTRY_TF) >> 6 ||
             VADDR_SEGMENT_TL(vaddr) > (entry & REGION_ENTRY_TL)) {
             return PGM_SEGMENT_TRANS;
-- 
2.21.0