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virtio: allow to fail setting status

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virtio-1 allow setting of the FEATURES_OK status bit to fail if
the negotiated feature bits are inconsistent: let's fail
virtio_set_status() in that case and update virtio-ccw to post an
error to the guest.

Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Cornelia Huck 2015-06-04 12:34:15 +02:00 committed by Michael S. Tsirkin
parent 6c0196d702
commit 0b352fd680
3 changed files with 37 additions and 10 deletions
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20
hw/s390x/virtio-ccw.c
View File

@ -497,15 +497,19 @@ static int virtio_ccw_cb(SubchDev *sch, CCW1 ccw)
if (!(status & VIRTIO_CONFIG_S_DRIVER_OK)) {
virtio_ccw_stop_ioeventfd(dev);
}
virtio_set_status(vdev, status);
if (vdev->status == 0) {
virtio_reset(vdev);
if (virtio_set_status(vdev, status) == 0) {
if (vdev->status == 0) {
virtio_reset(vdev);
}
if (status & VIRTIO_CONFIG_S_DRIVER_OK) {
virtio_ccw_start_ioeventfd(dev);
}
sch->curr_status.scsw.count = ccw.count - sizeof(status);
ret = 0;
} else {
/* Trigger a command reject. */
ret = -ENOSYS;
}
if (status & VIRTIO_CONFIG_S_DRIVER_OK) {
virtio_ccw_start_ioeventfd(dev);
}
sch->curr_status.scsw.count = ccw.count - sizeof(status);
ret = 0;
}
break;
case CCW_CMD_SET_IND:

24
hw/virtio/virtio.c
View File

@ -544,15 +544,37 @@ void virtio_update_irq(VirtIODevice *vdev)
virtio_notify_vector(vdev, VIRTIO_NO_VECTOR);
}
void virtio_set_status(VirtIODevice *vdev, uint8_t val)
static int virtio_validate_features(VirtIODevice *vdev)
{
VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev);
if (k->validate_features) {
return k->validate_features(vdev);
} else {
return 0;
}
}
int virtio_set_status(VirtIODevice *vdev, uint8_t val)
{
VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev);
trace_virtio_set_status(vdev, val);
if (virtio_has_feature(vdev, VIRTIO_F_VERSION_1)) {
if (!(vdev->status & VIRTIO_CONFIG_S_FEATURES_OK) &&
val & VIRTIO_CONFIG_S_FEATURES_OK) {
int ret = virtio_validate_features(vdev);
if (ret) {
return ret;
}
}
}
if (k->set_status) {
k->set_status(vdev, val);
}
vdev->status = val;
return 0;
}
bool target_words_bigendian(void);

3
include/hw/virtio/virtio.h
View File

@ -99,6 +99,7 @@ typedef struct VirtioDeviceClass {
uint64_t (*get_features)(VirtIODevice *vdev, uint64_t requested_features);
uint64_t (*bad_features)(VirtIODevice *vdev);
void (*set_features)(VirtIODevice *vdev, uint64_t val);
int (*validate_features)(VirtIODevice *vdev);
void (*get_config)(VirtIODevice *vdev, uint8_t *config);
void (*set_config)(VirtIODevice *vdev, const uint8_t *config);
void (*reset)(VirtIODevice *vdev);
@ -184,7 +185,7 @@ void virtio_queue_set_align(VirtIODevice *vdev, int n, int align);
void virtio_queue_notify(VirtIODevice *vdev, int n);
uint16_t virtio_queue_vector(VirtIODevice *vdev, int n);
void virtio_queue_set_vector(VirtIODevice *vdev, int n, uint16_t vector);
void virtio_set_status(VirtIODevice *vdev, uint8_t val);
int virtio_set_status(VirtIODevice *vdev, uint8_t val);
void virtio_reset(void *opaque);
void virtio_update_irq(VirtIODevice *vdev);
int virtio_set_features(VirtIODevice *vdev, uint64_t val);