Merge tag 'for-upstream' of https://gitlab.com/bonzini/qemu into staging

* Fix MMX instructions for system emulators
* Fix uninitialized TranslateFault after canonical address checks

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# gpg:                issuer "pbonzini@redhat.com"
# gpg: Good signature from "Paolo Bonzini <bonzini@gnu.org>" [full]
# gpg:                 aka "Paolo Bonzini <pbonzini@redhat.com>" [full]
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* tag 'for-upstream' of https://gitlab.com/bonzini/qemu:
  target/i386: Always completely initialize TranslateFault
  target/i386: allow MMX instructions with CR4.OSFXSR=0

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>

target/i386/tcg/decode-new.c.inc

@@ -1488,7 +1488,8 @@ static bool validate_vex(DisasContext *s, X86DecodedInsn *decode)
             if (!(s->flags & HF_AVX_EN_MASK)) {
                 goto illegal;
             }
-        } else {
+        } else if (e->special != X86_SPECIAL_MMX ||
+                   (s->prefix & (PREFIX_REPZ | PREFIX_REPNZ | PREFIX_DATA))) {
             if (!(s->flags & HF_OSFXSR_MASK)) {
                 goto illegal;
             }

target/i386/tcg/sysemu/excp_helper.c

@@ -71,10 +71,11 @@ static bool ptw_translate(PTETranslate *inout, hwaddr addr)
         TranslateFault *err = inout->err;
 
         assert(inout->ptw_idx == MMU_NESTED_IDX);
-        err->exception_index = 0; /* unused */
-        err->error_code = inout->env->error_code;
-        err->cr2 = addr;
-        err->stage2 = S2_GPT;
+        *err = (TranslateFault){
+            .error_code = inout->env->error_code,
+            .cr2 = addr,
+            .stage2 = S2_GPT,
+        };
         return false;
     }
     return true;
@@ -431,10 +432,11 @@ static bool mmu_translate(CPUX86State *env, const TranslateParams *in,
                                   MMU_NESTED_IDX, true,
                                   &pte_trans.haddr, &full, 0);
         if (unlikely(flags & TLB_INVALID_MASK)) {
-            err->exception_index = 0; /* unused */
-            err->error_code = env->error_code;
-            err->cr2 = paddr;
-            err->stage2 = S2_GPA;
+            *err = (TranslateFault){
+                .error_code = env->error_code,
+                .cr2 = paddr,
+                .stage2 = S2_GPA,
+            };
             return false;
         }
 
@@ -494,10 +496,11 @@ static bool mmu_translate(CPUX86State *env, const TranslateParams *in,
         }
         break;
     }
-    err->exception_index = EXCP0E_PAGE;
-    err->error_code = error_code;
-    err->cr2 = addr;
-    err->stage2 = S2_NONE;
+    *err = (TranslateFault){
+        .exception_index = EXCP0E_PAGE,
+        .error_code = error_code,
+        .cr2 = addr,
+    };
     return false;
 }
 
@@ -564,9 +567,10 @@ static bool get_physical_address(CPUX86State *env, vaddr addr,
                 int shift = in.pg_mode & PG_MODE_LA57 ? 56 : 47;
                 int64_t sext = (int64_t)addr >> shift;
                 if (sext != 0 && sext != -1) {
-                    err->exception_index = EXCP0D_GPF;
-                    err->error_code = 0;
-                    err->cr2 = addr;
+                    *err = (TranslateFault){
+                        .exception_index = EXCP0D_GPF,
+                        .cr2 = addr,
+                    };
                     return false;
                 }
             }