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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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16
migration/file.c
View file

@ -11,6 +11,7 @@
#include "qemu/error-report.h"
#include "qapi/error.h"
#include "channel.h"
#include "fd.h"
#include "file.h"
#include "migration.h"
#include "io/channel-file.h"
@ -53,15 +54,20 @@ bool file_send_channel_create(gpointer opaque, Error **errp)
{
QIOChannelFile *ioc;
int flags = O_WRONLY;
bool ret = true;
bool ret = false;
int fd = fd_args_get_fd();
ioc = qio_channel_file_new_path(outgoing_args.fname, flags, 0, errp);
if (!ioc) {
ret = false;
goto out;
if (fd && fd != -1) {
ioc = qio_channel_file_new_fd(dup(fd));
} else {
ioc = qio_channel_file_new_path(outgoing_args.fname, flags, 0, errp);
if (!ioc) {
goto out;
}
}
multifd_channel_connect(opaque, QIO_CHANNEL(ioc));
ret = true;
out:
/*