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virtio: add "use-started" property

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In order to avoid migration issues, we introduce a "use-started"
property to the base virtio device to indicate whether use
"started" flag or not. This property will be true by default and
set to false when machine type <= 4.0.

Suggested-by: Greg Kurz <groug@kaod.org>
Signed-off-by: Xie Yongji <xieyongji@baidu.com>
Message-Id: <20190626023130.31315-2-xieyongji@baidu.com>
Reviewed-by: Greg Kurz <groug@kaod.org>
Tested-by: Greg Kurz <groug@kaod.org>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Xie Yongji 2019-06-26 10:31:26 +08:00 • committed by Michael S. Tsirkin
parent 683c1d89ef
commit e57f2c31b6
4 changed files with 31 additions and 13 deletions
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21
include/hw/virtio/virtio.h
View file

@ -105,6 +105,7 @@ struct VirtIODevice
uint16_t device_id;
bool vm_running;
bool broken; /* device in invalid state, needs reset */
bool use_started;
bool started;
bool start_on_kick; /* virtio 1.0 transitional devices support that */
VMChangeStateEntry *vmstate;
@ -351,4 +352,24 @@ static inline bool virtio_is_big_endian(VirtIODevice *vdev)
/* Devices conforming to VIRTIO 1.0 or later are always LE. */
return false;
}
static inline bool virtio_device_started(VirtIODevice *vdev, uint8_t status)
{
if (vdev->use_started) {
return vdev->started;
}
return status & VIRTIO_CONFIG_S_DRIVER_OK;
}
static inline void virtio_set_started(VirtIODevice *vdev, bool started)
{
if (started) {
vdev->start_on_kick = false;
}
if (vdev->use_started) {
vdev->started = started;
}
}
#endif