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vhost-user: Don't pass file descriptor for VHOST_USER_REM_MEM_REG

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The spec clarifies now that QEMU should not send a file descriptor in a
request to remove a memory region. Change it accordingly.

For libvhost-user, this is a bug fix that makes it compatible with
rust-vmm's implementation that doesn't send a file descriptor. Keep
accepting, but ignoring a file descriptor for compatibility with older
QEMU versions.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Message-Id: <20220407133657.155281-4-kwolf@redhat.com>
Reviewed-by: Raphael Norwitz <raphael.norwitz@nutanix.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Kevin Wolf 2022-04-07 15:36:57 +02:00
parent 5ebfdeb212
commit a81d8d4a72
2 changed files with 5 additions and 5 deletions
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2
hw/virtio/vhost-user.c
View File

@ -751,7 +751,7 @@ static int send_remove_regions(struct vhost_dev *dev,
vhost_user_fill_msg_region(&region_buffer, shadow_reg, 0);
msg->payload.mem_reg.region = region_buffer;
ret = vhost_user_write(dev, msg, &fd, 1);
ret = vhost_user_write(dev, msg, NULL, 0);
if (ret < 0) {
return ret;
}

8
subprojects/libvhost-user/libvhost-user.c
View File

@ -822,15 +822,15 @@ vu_rem_mem_reg(VuDev *dev, VhostUserMsg *vmsg) {
int i;
bool found = false;
if (vmsg->fd_num != 1) {
if (vmsg->fd_num > 1) {
vmsg_close_fds(vmsg);
vu_panic(dev, "VHOST_USER_REM_MEM_REG received %d fds - only 1 fd "
vu_panic(dev, "VHOST_USER_REM_MEM_REG received %d fds - at most 1 fd "
"should be sent for this message type", vmsg->fd_num);
return false;
}
if (vmsg->size < VHOST_USER_MEM_REG_SIZE) {
close(vmsg->fds[0]);
vmsg_close_fds(vmsg);
vu_panic(dev, "VHOST_USER_REM_MEM_REG requires a message size of at "
"least %d bytes and only %d bytes were received",
VHOST_USER_MEM_REG_SIZE, vmsg->size);
@ -877,7 +877,7 @@ vu_rem_mem_reg(VuDev *dev, VhostUserMsg *vmsg) {
vu_panic(dev, "Specified region not found\n");
}
close(vmsg->fds[0]);
vmsg_close_fds(vmsg);
return false;
}