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migration/multifd: Add mapped-ram support to fd: URI

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If we receive a file descriptor that points to a regular file, there's
nothing stopping us from doing multifd migration with mapped-ram to
that file.

Enable the fd: URI to work with multifd + mapped-ram.

Note that the fds passed into multifd are duplicated because we want
to avoid cross-thread effects when doing cleanup (i.e. close(fd)). The
original fd doesn't need to be duplicated because monitor_get_fd()
transfers ownership to the caller.

Signed-off-by: Fabiano Rosas <farosas@suse.de>
Reviewed-by: Peter Xu <peterx@redhat.com>
Link: https://lore.kernel.org/r/20240229153017.2221-23-farosas@suse.de
Signed-off-by: Peter Xu <peterx@redhat.com>
This commit is contained in:
Fabiano Rosas 2024-02-29 12:30:16 -03:00 • committed by Peter Xu
parent a49d15a38d
commit decdc76772
5 changed files with 63 additions and 5 deletions
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2
migration/fd.h
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@ -20,4 +20,6 @@ void fd_start_incoming_migration(const char *fdname, Error **errp);
void fd_start_outgoing_migration(MigrationState *s, const char *fdname,
Error **errp);
void fd_cleanup_outgoing_migration(void);
int fd_args_get_fd(void);
#endif