[Qemu-devel] [PATCH v2 01/30] target-sparc: ignore MMU-faults if MMU is disabled in hypervisor mode

[Artyom Tarasenko <atar4qemu@gmail.com>]

while IMMU/DMMU is disabled
- ignore MMU-faults in hypervisorv mode or if CPU doesn't have hypervisor
- signal TT_INSN_REAL_TRANSLATION_MISS/TT_DATA_REAL_TRANSLATION_MISS otherwise

Signed-off-by: Artyom Tarasenko <atar4qemu@gmail.com>
---
 target/sparc/cpu.h         |  2 ++
 target/sparc/ldst_helper.c | 15 +++++++++++++--
 2 files changed, 15 insertions(+), 2 deletions(-)

diff --git a/target/sparc/cpu.h b/target/sparc/cpu.h
index 5fb0ed1..e0b2806 100644
--- a/target/sparc/cpu.h
+++ b/target/sparc/cpu.h
@@ -68,6 +68,8 @@
 #define TT_DATA_ACCESS 0x32
 #define TT_UNALIGNED 0x34
 #define TT_PRIV_ACT 0x37
+#define TT_INSN_REAL_TRANSLATION_MISS 0x3e
+#define TT_DATA_REAL_TRANSLATION_MISS 0x3f
 #define TT_EXTINT   0x40
 #define TT_IVEC     0x60
 #define TT_TMISS    0x64
diff --git a/target/sparc/ldst_helper.c b/target/sparc/ldst_helper.c
index de7d53a..fdca87f 100644
--- a/target/sparc/ldst_helper.c
+++ b/target/sparc/ldst_helper.c
@@ -1664,14 +1664,25 @@ void sparc_cpu_unassigned_access(CPUState *cs, hwaddr addr,
 {
     SPARCCPU *cpu = SPARC_CPU(cs);
     CPUSPARCState *env = &cpu->env;
-    int tt = is_exec ? TT_CODE_ACCESS : TT_DATA_ACCESS;
 
 #ifdef DEBUG_UNASSIGNED
     printf("Unassigned mem access to " TARGET_FMT_plx " from " TARGET_FMT_lx
            "\n", addr, env->pc);
 #endif
 
-    cpu_raise_exception_ra(env, tt, GETPC());
+    if (is_exec) { /* XXX has_hypervisor */
+        if (env->lsu & (IMMU_E)) {
+            cpu_raise_exception_ra(env, TT_CODE_ACCESS, GETPC());
+        } else if (cpu_has_hypervisor(env) && !(env->hpstate & HS_PRIV)) {
+            cpu_raise_exception_ra(env, TT_INSN_REAL_TRANSLATION_MISS, GETPC());
+        }
+    } else {
+        if (env->lsu & (DMMU_E)) {
+            cpu_raise_exception_ra(env, TT_DATA_ACCESS, GETPC());
+        } else if (cpu_has_hypervisor(env) && !(env->hpstate & HS_PRIV)) {
+            cpu_raise_exception_ra(env, TT_DATA_REAL_TRANSLATION_MISS, GETPC());
+        }
+    }
 }
 #endif
 #endif
-- 
1.8.3.1