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vhost: fail backend intialization early

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Don't initialize vhost backend if memslots number exceeds the supported
limit. This prevents failures down the road when backend
is actually started.

[MST: rewrite commit log]

Signed-off-by: Igor Mammedov <imammedo@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Igor Mammedov 2015-10-06 10:37:29 +02:00 committed by Michael S. Tsirkin
parent 3fad87881e
commit aebf81680b
1 changed files with 6 additions and 0 deletions
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6
hw/virtio/vhost.c
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@ -933,6 +933,12 @@ int vhost_dev_init(struct vhost_dev *hdev, void *opaque,
return -errno;
}
if (used_memslots > hdev->vhost_ops->vhost_backend_memslots_limit(hdev)) {
fprintf(stderr, "vhost backend memory slots limit is less"
" than current number of present memory slots\n");
close((uintptr_t)opaque);
return -1;
}
QLIST_INSERT_HEAD(&vhost_devices, hdev, entry);
r = hdev->vhost_ops->vhost_call(hdev, VHOST_SET_OWNER, NULL);