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ram: Document migration ram flags

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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>
This commit is contained in:
Juan Quintela 2022-07-28 10:14:42 +02:00
parent cfc3bcf373
commit 7b548761e5
1 changed files with 10 additions and 6 deletions
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16
migration/ram.c
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@ -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;