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um: virtio: disable VQs during suspend

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If the system is suspended, the device shouldn't be able to send
anything to it. Disable virtqueues in suspend to simulate this,
and as we might be only using s2idle (kernel services are still
on), prevent sending anything on them as well.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Richard Weinberger <richard@nod.at>
This commit is contained in:
Johannes Berg 2020-12-15 10:52:23 +01:00 committed by Richard Weinberger
parent 10c2b5aeb2
commit 9b84512cfe
1 changed files with 36 additions and 0 deletions
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36
arch/um/drivers/virtio_uml.c
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@ -65,6 +65,7 @@ struct virtio_uml_vq_info {
vq_callback_t *callback;
struct time_travel_event defer;
#endif
bool suspended;
};
extern unsigned long long physmem_size, highmem;
@ -725,6 +726,9 @@ static bool vu_notify(struct virtqueue *vq)
const uint64_t n = 1;
int rc;
if (info->suspended)
return true;
time_travel_propagate_time();
if (info->kick_fd < 0) {
@ -1288,6 +1292,36 @@ static const struct of_device_id virtio_uml_match[] = {
};
MODULE_DEVICE_TABLE(of, virtio_uml_match);
static int virtio_uml_suspend(struct platform_device *pdev, pm_message_t state)
{
struct virtio_uml_device *vu_dev = platform_get_drvdata(pdev);
struct virtqueue *vq;
virtio_device_for_each_vq((&vu_dev->vdev), vq) {
struct virtio_uml_vq_info *info = vq->priv;
info->suspended = true;
vhost_user_set_vring_enable(vu_dev, vq->index, false);
}
return 0;
}
static int virtio_uml_resume(struct platform_device *pdev)
{
struct virtio_uml_device *vu_dev = platform_get_drvdata(pdev);
struct virtqueue *vq;
virtio_device_for_each_vq((&vu_dev->vdev), vq) {
struct virtio_uml_vq_info *info = vq->priv;
info->suspended = false;
vhost_user_set_vring_enable(vu_dev, vq->index, true);
}
return 0;
}
static struct platform_driver virtio_uml_driver = {
.probe = virtio_uml_probe,
.remove = virtio_uml_remove,
@ -1295,6 +1329,8 @@ static struct platform_driver virtio_uml_driver = {
.name = "virtio-uml",
.of_match_table = virtio_uml_match,
},
.suspend = virtio_uml_suspend,
.resume = virtio_uml_resume,
};
static int __init virtio_uml_init(void)