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[Qemu-devel] [PATCH for-2.3] softmmu: clarify meaning of TLB_NOTDIRTY bi
From: |
Stefan Hajnoczi |
Subject: |
[Qemu-devel] [PATCH for-2.3] softmmu: clarify meaning of TLB_NOTDIRTY bit |
Date: |
Wed, 26 Nov 2014 16:50:16 +0000 |
It wasn't obvious to me why the TLB entries should cache the memory
dirty bitmap state.
Signed-off-by: Stefan Hajnoczi <address@hidden>
---
include/exec/cpu-all.h | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/include/exec/cpu-all.h b/include/exec/cpu-all.h
index c085804..e71e47e 100644
--- a/include/exec/cpu-all.h
+++ b/include/exec/cpu-all.h
@@ -329,7 +329,8 @@ extern RAMList ram_list;
/* Zero if TLB entry is valid. */
#define TLB_INVALID_MASK (1 << 3)
/* Set if TLB entry references a clean RAM page. The iotlb entry will
- contain the page physical address. */
+ contain the page physical address. Forces us to take the slow path so pages
+ get marked dirty, whereas the fast path does not mark pages dirty. */
#define TLB_NOTDIRTY (1 << 4)
/* Set if TLB entry is an IO callback. */
#define TLB_MMIO (1 << 5)
--
2.1.0
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