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| author | Ilya Leoshkevich | 2022-09-06 02:08:38 +0200 |
|---|---|---|
| committer | Laurent Vivier | 2022-09-27 09:30:46 +0200 |
| commit | f93b76958a358e82bfdd1474598fe75184afeb4d (patch) | |
| tree | 12afdebbd88ade70a4313fd25f54db9f33349ad9 /include | |
| parent | linux-user: Implement stracing madvise() (diff) | |
| download | qemu-f93b76958a358e82bfdd1474598fe75184afeb4d.tar.gz qemu-f93b76958a358e82bfdd1474598fe75184afeb4d.tar.xz qemu-f93b76958a358e82bfdd1474598fe75184afeb4d.zip | |
linux-user: Passthrough MADV_DONTNEED for certain file mappings
This is a follow-up for commit 892a4f6a750a ("linux-user: Add partial
support for MADV_DONTNEED"), which added passthrough for anonymous
mappings. File mappings can be handled in a similar manner.
In order to do that, mark pages, for which mmap() was passed through,
with PAGE_PASSTHROUGH, and then allow madvise() passthrough for these
pages. Drop the explicit PAGE_ANON check, since anonymous mappings are
expected to have PAGE_PASSTHROUGH anyway.
Add PAGE_PASSTHROUGH to PAGE_STICKY in order to keep it on mprotect().
Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20220725125043.43048-1-iii@linux.ibm.com>
Message-Id: <20220906000839.1672934-5-iii@linux.ibm.com>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
Diffstat (limited to 'include')
| -rw-r--r-- | include/exec/cpu-all.h | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/include/exec/cpu-all.h b/include/exec/cpu-all.h index 491629b9ba..16b7df41bf 100644 --- a/include/exec/cpu-all.h +++ b/include/exec/cpu-all.h @@ -262,6 +262,12 @@ extern const TargetPageBits target_page; #define PAGE_TARGET_1 0x0200 #define PAGE_TARGET_2 0x0400 +/* + * For linux-user, indicates that the page is mapped with the same semantics + * in both guest and host. + */ +#define PAGE_PASSTHROUGH 0x0800 + #if defined(CONFIG_USER_ONLY) void page_dump(FILE *f); |