[Qemu-devel] [PATCH 3/14] target/mips: Weaken TLB flush on UX, SX, KX, ASID changes

[James Hogan]

There is no need to invalidate any shadow TLB entries when the ASID
changes or when access to one of the 64-bit segments has been disabled,
since doing so doesn't reveal to software whether any TLB entries have
been evicted into the shadow half of the TLB.

Therefore weaken the tlb flushes in these cases to only flush the QEMU
TLB.

Signed-off-by: James Hogan <address@hidden>
Cc: Yongbok Kim <address@hidden>
Cc: Aurelien Jarno <address@hidden>
---
Changes in v2:
- New patch.
---
 target/mips/helper.c    | 2 +-
 target/mips/op_helper.c | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/target/mips/helper.c b/target/mips/helper.c
index e359ca3b448d..ceaeb8ceaf49 100644
--- a/target/mips/helper.c
+++ b/target/mips/helper.c
@@ -290,7 +290,7 @@ void cpu_mips_store_status(CPUMIPSState *env, target_ulong 
val)
 #if defined(TARGET_MIPS64)
     if ((env->CP0_Status ^ old) & (old & (7 << CP0St_UX))) {
         /* Access to at least one of the 64-bit segments has been disabled */
-        cpu_mips_tlb_flush(env);
+        tlb_flush(CPU(mips_env_get_cpu(env)));
     }
 #endif
     if (env->CP0_Config3 & (1 << CP0C3_MT)) {
diff --git a/target/mips/op_helper.c b/target/mips/op_helper.c
index 1961cacfab18..c07f68ce1a97 100644
--- a/target/mips/op_helper.c
+++ b/target/mips/op_helper.c
@@ -1416,7 +1416,7 @@ void helper_mtc0_entryhi(CPUMIPSState *env, target_ulong 
arg1)
     /* If the ASID changes, flush qemu's TLB.  */
     if ((old & env->CP0_EntryHi_ASID_mask) !=
         (val & env->CP0_EntryHi_ASID_mask)) {
-        cpu_mips_tlb_flush(env);
+        tlb_flush(CPU(mips_env_get_cpu(env)));
     }
 }
 
-- 
git-series 0.8.10