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migration/multifd: Support incoming mapped-ram stream format

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For the incoming mapped-ram migration we need to read the ramblock
headers, get the pages bitmap and send the host address of each
non-zero page to the multifd channel thread for writing.

Usage on HMP is:

(qemu) migrate_set_capability multifd on
(qemu) migrate_set_capability mapped-ram on
(qemu) migrate_incoming file:migfile

(the ram.h include needs to move because we've been previously relying
on it being included from migration.c. Now file.h will start including
multifd.h before migration.o is processed)

Reviewed-by: Peter Xu <peterx@redhat.com>
Signed-off-by: Fabiano Rosas <farosas@suse.de>
Link: https://lore.kernel.org/r/20240229153017.2221-22-farosas@suse.de
Signed-off-by: Peter Xu <peterx@redhat.com>
This commit is contained in:
Fabiano Rosas
2024-02-29 12:30:15 -03:00
committed by Peter Xu
parent f427d90b98
commit a49d15a38d
5 changed files with 73 additions and 6 deletions
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18
migration/file.c
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@@ -13,7 +13,6 @@
#include "channel.h"
#include "file.h"
#include "migration.h"
#include "multifd.h"
#include "io/channel-file.h"
#include "io/channel-util.h"
#include "options.h"
@@ -204,3 +203,20 @@ int file_write_ramblock_iov(QIOChannel *ioc, const struct iovec *iov,
return (ret < 0) ? ret : 0;
}
int multifd_file_recv_data(MultiFDRecvParams *p, Error **errp)
{
MultiFDRecvData *data = p->data;
size_t ret;
ret = qio_channel_pread(p->c, (char *) data->opaque,
data->size, data->file_offset, errp);
if (ret != data->size) {
error_prepend(errp,
"multifd recv (%u): read 0x%zx, expected 0x%zx",
p->id, ret, data->size);
return -1;
}
return 0;
}