From f93b76958a358e82bfdd1474598fe75184afeb4d Mon Sep 17 00:00:00 2001 From: Ilya Leoshkevich Date: Tue, 6 Sep 2022 02:08:38 +0200 Subject: 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 Reviewed-by: Richard Henderson Message-Id: <20220725125043.43048-1-iii@linux.ibm.com> Message-Id: <20220906000839.1672934-5-iii@linux.ibm.com> Signed-off-by: Laurent Vivier --- include/exec/cpu-all.h | 6 ++++++ 1 file changed, 6 insertions(+) (limited to 'include') diff --git a/include/exec/cpu-all.h b/include/exec/cpu-all.h index 491629b..16b7df4 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); -- cgit v1.1