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[Qemu-devel,v6,23/26] cpu: TLB_FLAGS_MASK bit to force memory slow path

Message ID 1565166860242.78427@bt.com (mailing list archive)
State Superseded
Headers show
Series Invert Endian bit in SPARCv9 MMU TTE | expand

Commit Message

Tony Nguyen Aug. 7, 2019, 8:34 a.m. UTC 
The fast path is taken when TLB_FLAGS_MASK is all zero.

TLB_FORCE_SLOW is simply a TLB_FLAGS_MASK bit to force the slow path,
there are no other side effects.

Signed-off-by: Tony Nguyen <tony.nguyen@bt.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
---
 include/exec/cpu-all.h | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

--
1.8.3.1

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Patch

diff --git a/include/exec/cpu-all.h b/include/exec/cpu-all.h
index 536ea58..e496f99 100644
--- a/include/exec/cpu-all.h
+++ b/include/exec/cpu-all.h
@@ -331,12 +331,18 @@  CPUArchState *cpu_copy(CPUArchState *env);
 #define TLB_MMIO            (1 << (TARGET_PAGE_BITS - 3))
 /* Set if TLB entry must have MMU lookup repeated for every access */
 #define TLB_RECHECK         (1 << (TARGET_PAGE_BITS - 4))
+/* Set if TLB entry must take the slow path.  */
+#define TLB_FORCE_SLOW      (1 << (TARGET_PAGE_BITS - 5))

 /* Use this mask to check interception with an alignment mask
  * in a TCG backend.
  */
-#define TLB_FLAGS_MASK  (TLB_INVALID_MASK | TLB_NOTDIRTY | TLB_MMIO \
-                         | TLB_RECHECK)
+#define TLB_FLAGS_MASK \
+    (TLB_INVALID_MASK  \
+     | TLB_NOTDIRTY    \
+     | TLB_MMIO        \
+     | TLB_RECHECK     \
+     | TLB_FORCE_SLOW)

 /**
  * tlb_hit_page: return true if page aligned @addr is a hit against the