diff options
| author | Juan Quintela <quintela@redhat.com> | 2022-07-28 10:14:42 +0200 |
|---|---|---|
| committer | Juan Quintela <quintela@redhat.com> | 2023-02-13 03:45:47 +0100 |
| commit | 7b548761e5d084f2fc0fc4badebab227b51a8a84 (patch) | |
| tree | d114324ea2c5912e7858ec4f0d6e9d3c3615ef49 /migration | |
| parent | cfc3bcf373218fb8757b0ff1ce2017b9b6ad4bff (diff) | |
ram: Document migration ram flags
0x80 is RAM_SAVE_FLAG_HOOK, it is in qemu-file now.
Bigger usable flag is 0x200, noticing that.
We can reuse RAM_SAVe_FLAG_FULL.
Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>
Diffstat (limited to 'migration')
| -rw-r--r-- | migration/ram.c | 16 |
1 files changed, 10 insertions, 6 deletions
diff --git a/migration/ram.c b/migration/ram.c index 18ac68b181..521912385d 100644 --- a/migration/ram.c +++ b/migration/ram.c @@ -67,21 +67,25 @@ /***********************************************************/ /* ram save/restore */ -/* RAM_SAVE_FLAG_ZERO used to be named RAM_SAVE_FLAG_COMPRESS, it - * worked for pages that where filled with the same char. We switched +/* + * RAM_SAVE_FLAG_ZERO used to be named RAM_SAVE_FLAG_COMPRESS, it + * worked for pages that were filled with the same char. We switched * it to only search for the zero value. And to avoid confusion with - * RAM_SSAVE_FLAG_COMPRESS_PAGE just rename it. + * RAM_SAVE_FLAG_COMPRESS_PAGE just rename it. */ - -#define RAM_SAVE_FLAG_FULL 0x01 /* Obsolete, not used anymore */ +/* + * RAM_SAVE_FLAG_FULL was obsoleted in 2009, it can be reused now + */ +#define RAM_SAVE_FLAG_FULL 0x01 #define RAM_SAVE_FLAG_ZERO 0x02 #define RAM_SAVE_FLAG_MEM_SIZE 0x04 #define RAM_SAVE_FLAG_PAGE 0x08 #define RAM_SAVE_FLAG_EOS 0x10 #define RAM_SAVE_FLAG_CONTINUE 0x20 #define RAM_SAVE_FLAG_XBZRLE 0x40 -/* 0x80 is reserved in migration.h start with 0x100 next */ +/* 0x80 is reserved in qemu-file.h for RAM_SAVE_FLAG_HOOK */ #define RAM_SAVE_FLAG_COMPRESS_PAGE 0x100 +/* We can't use any flag that is bigger than 0x200 */ int (*xbzrle_encode_buffer_func)(uint8_t *, uint8_t *, int, uint8_t *, int) = xbzrle_encode_buffer; |