Commit c00bbcf8 authored Mar 29, 2016 by Stefan Hajnoczi Committed by Michael S. Tsirkin Apr 07, 2016

virtio: add VIRTIO_CONFIG_S_NEEDS_RESET device status bit



The VIRTIO 1.0 specification added the DEVICE_NEEDS_RESET device status
bit in "VIRTIO-98: Add DEVICE_NEEDS_RESET".  This patch defines the
device status bit in the uapi header file so that both the kernel and
userspace applications can use it.

The bit is currently unused by the virtio guest drivers and vhost.
According to the spec "a good implementation will try to recover by
issuing a reset".  This is not attempted here because it requires
auditing the virtio drivers to ensure there are no resource leaks or
crashes if the device needs to be reset mid-operation.

See "2.1 Device Status Field" in the VIRTIO 1.0 specification for
details.

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

parent eeca9a67

include/uapi/linux/virtio_config.h

+2 −0

Original line number	Diff line number	Diff line
		@@ -40,6 +40,8 @@
		#define VIRTIO_CONFIG_S_DRIVER_OK 4
		/* Driver has finished configuring features */
		#define VIRTIO_CONFIG_S_FEATURES_OK 8
		/* Device entered invalid state, driver must reset it */
		#define VIRTIO_CONFIG_S_NEEDS_RESET 0x40
		/* We've given up on this device. */
		#define VIRTIO_CONFIG_S_FAILED 0x80