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vhost+postcopy: Transmit 'listen' to slave

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Notify the vhost-user slave on reception of the 'postcopy-listen'
event from the source.

Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: Peter Xu <peterx@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Dr. David Alan Gilbert 2018-03-12 17:21:06 +00:00 • committed by Michael S. Tsirkin
parent f82c11165f
commit 6864a7b5ac
7 changed files with 77 additions and 0 deletions
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34
hw/virtio/vhost-user.c
View file

@ -20,6 +20,7 @@
#include "sysemu/cryptodev.h"
#include "migration/migration.h"
#include "migration/postcopy-ram.h"
#include "trace.h"
#include <sys/ioctl.h>
#include <sys/socket.h>
@ -79,6 +80,7 @@ typedef enum VhostUserRequest {
VHOST_USER_CREATE_CRYPTO_SESSION = 26,
VHOST_USER_CLOSE_CRYPTO_SESSION = 27,
VHOST_USER_POSTCOPY_ADVISE = 28,
VHOST_USER_POSTCOPY_LISTEN = 29,
VHOST_USER_MAX
} VhostUserRequest;
@ -172,6 +174,8 @@ struct vhost_user {
int slave_fd;
NotifierWithReturn postcopy_notifier;
struct PostCopyFD postcopy_fd;
/* True once we've entered postcopy_listen */
bool postcopy_listen;
};
static bool ioeventfd_enabled(void)
@ -858,6 +862,33 @@ static int vhost_user_postcopy_advise(struct vhost_dev *dev, Error **errp)
return 0;
}
/*
* Called at the switch to postcopy on reception of the 'listen' command.
*/
static int vhost_user_postcopy_listen(struct vhost_dev *dev, Error **errp)
{
struct vhost_user *u = dev->opaque;
int ret;
VhostUserMsg msg = {
.hdr.request = VHOST_USER_POSTCOPY_LISTEN,
.hdr.flags = VHOST_USER_VERSION | VHOST_USER_NEED_REPLY_MASK,
};
u->postcopy_listen = true;
trace_vhost_user_postcopy_listen();
if (vhost_user_write(dev, &msg, NULL, 0) < 0) {
error_setg(errp, "Failed to send postcopy_listen to vhost");
return -1;
}
ret = process_message_reply(dev, &msg);
if (ret) {
error_setg(errp, "Failed to receive reply to postcopy_listen");
return ret;
}
return 0;
}
static int vhost_user_postcopy_notifier(NotifierWithReturn *notifier,
void *opaque)
{
@ -880,6 +911,9 @@ static int vhost_user_postcopy_notifier(NotifierWithReturn *notifier,
case POSTCOPY_NOTIFY_INBOUND_ADVISE:
return vhost_user_postcopy_advise(dev, pnd->errp);
case POSTCOPY_NOTIFY_INBOUND_LISTEN:
return vhost_user_postcopy_listen(dev, pnd->errp);
default:
/* We ignore notifications we don't know */
break;