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vhost: support postcopy end request

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The master sends this message before stopping handling
userfaults, so that the backend closes the userfaultfd.

The master waits for the slave to acknowledge the request
with an empty 64bits payload for synchronization purpose.

Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Signed-off-by: Maxime Coquelin <maxime.coquelin@redhat.com>
This commit is contained in:
Maxime Coquelin 2018-10-12 14:40:44 +02:00 committed by Ferruh Yigit
parent 5c2ee9662d
commit 9a0a3a25fa
2 changed files with 23 additions and 1 deletions
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21
lib/librte_vhost/vhost_user.c
View File

@ -77,6 +77,7 @@ static const char *vhost_message_str[VHOST_USER_MAX] = {
[VHOST_USER_CRYPTO_CLOSE_SESS] = "VHOST_USER_CRYPTO_CLOSE_SESS",
[VHOST_USER_POSTCOPY_ADVISE] = "VHOST_USER_POSTCOPY_ADVISE",
[VHOST_USER_POSTCOPY_LISTEN] = "VHOST_USER_POSTCOPY_LISTEN",
[VHOST_USER_POSTCOPY_END] = "VHOST_USER_POSTCOPY_END",
};
static int send_vhost_reply(int sockfd, struct VhostUserMsg *msg);
@ -1636,6 +1637,25 @@ vhost_user_set_postcopy_listen(struct virtio_net **pdev,
return VH_RESULT_OK;
}
static int
vhost_user_postcopy_end(struct virtio_net **pdev, struct VhostUserMsg *msg,
int main_fd __rte_unused)
{
struct virtio_net *dev = *pdev;
dev->postcopy_listening = 0;
if (dev->postcopy_ufd >= 0) {
close(dev->postcopy_ufd);
dev->postcopy_ufd = -1;
}
msg->payload.u64 = 0;
msg->size = sizeof(msg->payload.u64);
msg->fd_num = 0;
return VH_RESULT_REPLY;
}
typedef int (*vhost_message_handler_t)(struct virtio_net **pdev,
struct VhostUserMsg *msg,
int main_fd);
@ -1665,6 +1685,7 @@ static vhost_message_handler_t vhost_message_handlers[VHOST_USER_MAX] = {
[VHOST_USER_IOTLB_MSG] = vhost_user_iotlb_msg,
[VHOST_USER_POSTCOPY_ADVISE] = vhost_user_set_postcopy_advise,
[VHOST_USER_POSTCOPY_LISTEN] = vhost_user_set_postcopy_listen,
[VHOST_USER_POSTCOPY_END] = vhost_user_postcopy_end,
};

3
lib/librte_vhost/vhost_user.h
View File

@ -52,7 +52,8 @@ typedef enum VhostUserRequest {
VHOST_USER_CRYPTO_CLOSE_SESS = 27,
VHOST_USER_POSTCOPY_ADVISE = 28,
VHOST_USER_POSTCOPY_LISTEN = 29,
VHOST_USER_MAX = 30
VHOST_USER_POSTCOPY_END = 30,
VHOST_USER_MAX = 31
} VhostUserRequest;
typedef enum VhostUserSlaveRequest {