target/i386: enable A20 automatically in system management mode

Ignore env->a20_mask when running in system management mode.

Reported-by: Anthony Xu <anthony.xu@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Message-Id: <1494502528-12670-1-git-send-email-pbonzini@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

1 files changed, 10 insertions, 8 deletions

diff --git a/target/i386/arch_memory_mapping.c b/target/i386/arch_memory_mapping.c
index 826aee597b..647cff2829 100644
--- a/target/i386/arch_memory_mapping.c
+++ b/target/i386/arch_memory_mapping.c
@@ -272,25 +272,27 @@ void x86_cpu_get_memory_mapping(CPUState *cs, MemoryMappingList *list,
 {
     X86CPU *cpu = X86_CPU(cs);
     CPUX86State *env = &cpu->env;
+    int32_t a20_mask;
 
     if (!cpu_paging_enabled(cs)) {
         /* paging is disabled */
         return;
     }
 
+    a20_mask = x86_get_a20_mask(env);
     if (env->cr[4] & CR4_PAE_MASK) {
 #ifdef TARGET_X86_64
         if (env->hflags & HF_LMA_MASK) {
             if (env->cr[4] & CR4_LA57_MASK) {
                 hwaddr pml5e_addr;
 
-                pml5e_addr = (env->cr[3] & PLM4_ADDR_MASK) & env->a20_mask;
-                walk_pml5e(list, cs->as, pml5e_addr, env->a20_mask);
+                pml5e_addr = (env->cr[3] & PLM4_ADDR_MASK) & a20_mask;
+                walk_pml5e(list, cs->as, pml5e_addr, a20_mask);
             } else {
                 hwaddr pml4e_addr;
 
-                pml4e_addr = (env->cr[3] & PLM4_ADDR_MASK) & env->a20_mask;
-                walk_pml4e(list, cs->as, pml4e_addr, env->a20_mask,
+                pml4e_addr = (env->cr[3] & PLM4_ADDR_MASK) & a20_mask;
+                walk_pml4e(list, cs->as, pml4e_addr, a20_mask,
                         0xffffULL << 48);
             }
         } else
@@ -298,16 +300,16 @@ void x86_cpu_get_memory_mapping(CPUState *cs, MemoryMappingList *list,
         {
             hwaddr pdpe_addr;
 
-            pdpe_addr = (env->cr[3] & ~0x1f) & env->a20_mask;
-            walk_pdpe2(list, cs->as, pdpe_addr, env->a20_mask);
+            pdpe_addr = (env->cr[3] & ~0x1f) & a20_mask;
+            walk_pdpe2(list, cs->as, pdpe_addr, a20_mask);
         }
     } else {
         hwaddr pde_addr;
         bool pse;
 
-        pde_addr = (env->cr[3] & ~0xfff) & env->a20_mask;
+        pde_addr = (env->cr[3] & ~0xfff) & a20_mask;
         pse = !!(env->cr[4] & CR4_PSE_MASK);
-        walk_pde2(list, cs->as, pde_addr, env->a20_mask, pse);
+        walk_pde2(list, cs->as, pde_addr, a20_mask, pse);
     }
 }