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vhost user does not support LOG_ALL feature bit. Generally, we should not try to set this bit without checking that backend can support it first. Detect and block migration. Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Nikolay Nikolaev <n.nikolaev@virtualopensystems.com> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>