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block: Introduce buf register API

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Allow block driver to map and unmap a buffer for later I/O, as a performance
hint.

Signed-off-by: Fam Zheng <famz@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-Id: <20180116060901.17413-5-famz@redhat.com>
Signed-off-by: Fam Zheng <famz@redhat.com>
This commit is contained in:
Fam Zheng 2018-01-16 14:08:56 +08:00
parent bdd6a90a9e
commit 23d0ba9319
5 changed files with 56 additions and 1 deletions
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3
include/sysemu/block-backend.h
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@ -229,4 +229,7 @@ void blk_io_limits_enable(BlockBackend *blk, const char *group);
void blk_io_limits_update_group(BlockBackend *blk, const char *group);
void blk_set_force_allow_inactivate(BlockBackend *blk);
void blk_register_buf(BlockBackend *blk, void *host, size_t size);
void blk_unregister_buf(BlockBackend *blk, void *host);
#endif