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migration: file URI

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Extend the migration URI to support file:<filename>.  This can be used for
any migration scenario that does not require a reverse path.  It can be
used as an alternative to 'exec:cat > file' in minimized containers that
do not contain /bin/sh, and it is easier to use than the fd:<fdname> URI.
It can be used in HMP commands, and as a qemu command-line parameter.

For best performance, guest ram should be shared and x-ignore-shared
should be true, so guest pages are not written to the file, in which case
the guest may remain running.  If ram is not so configured, then the user
is advised to stop the guest first.  Otherwise, a busy guest may re-dirty
the same page, causing it to be appended to the file multiple times,
and the file may grow unboundedly.  That issue is being addressed in the
"fixed-ram" patch series.

Signed-off-by: Steve Sistare <steven.sistare@oracle.com>
Tested-by: Michael Galaxy <mgalaxy@akamai.com>
Reviewed-by: Michael Galaxy <mgalaxy@akamai.com>
Reviewed-by: Fabiano Rosas <farosas@suse.de>
Reviewed-by: Peter Xu <peterx@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>
Message-ID: <1694182931-61390-2-git-send-email-steven.sistare@oracle.com>
This commit is contained in:
Steve Sistare 2023-09-08 07:22:10 -07:00 • committed by Juan Quintela
parent b28e3ecf0d
commit 2a9e2e595f
6 changed files with 91 additions and 1 deletions
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5
migration/migration.c
View file

@ -20,6 +20,7 @@
#include "migration/blocker.h"
#include "exec.h"
#include "fd.h"
#include "file.h"
#include "socket.h"
#include "sysemu/runstate.h"
#include "sysemu/sysemu.h"
@ -449,6 +450,8 @@ static void qemu_start_incoming_migration(const char *uri, Error **errp)
exec_start_incoming_migration(p, errp);
} else if (strstart(uri, "fd:", &p)) {
fd_start_incoming_migration(p, errp);
} else if (strstart(uri, "file:", &p)) {
file_start_incoming_migration(p, errp);
} else {
error_setg(errp, "unknown migration protocol: %s", uri);
}
@ -1702,6 +1705,8 @@ void qmp_migrate(const char *uri, bool has_blk, bool blk,
exec_start_outgoing_migration(s, p, &local_err);
} else if (strstart(uri, "fd:", &p)) {
fd_start_outgoing_migration(s, p, &local_err);
} else if (strstart(uri, "file:", &p)) {
file_start_outgoing_migration(s, p, &local_err);
} else {
error_setg(&local_err, QERR_INVALID_PARAMETER_VALUE, "uri",
"a valid migration protocol");