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vdpa_sim: Implement resume vdpa op 

Implement resume operation for vdpa_sim devices, so vhost-vdpa will
offer that backend feature and userspace can effectively resume the
device.

Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
Message-Id: <15a4566826033c5dd9a2167e5cfb0ef4d90cea49.1672742878.git.sebastien.boeuf@intel.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Acked-by: Jason Wang <jasowang@redhat.com>
This commit is contained in:
Sebastien Boeuf 2023-01-03 11:51:08 +01:00 committed by Michael S. Tsirkin
parent 3b688d7a08
commit f9d9f57ef0
2 changed files with 30 additions and 0 deletions
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29
drivers/vdpa/vdpa_sim/vdpa_sim.c
View File

@ -358,6 +358,12 @@ static void vdpasim_kick_vq(struct vdpa_device *vdpa, u16 idx)
struct vdpasim *vdpasim = vdpa_to_sim(vdpa);
struct vdpasim_virtqueue *vq = &vdpasim->vqs[idx];
if (!vdpasim->running &&
(vdpasim->status & VIRTIO_CONFIG_S_DRIVER_OK)) {
vdpasim->pending_kick = true;
return;
}
if (vq->ready)
schedule_work(&vdpasim->work);
}
@ -528,6 +534,27 @@ static int vdpasim_suspend(struct vdpa_device *vdpa)
return 0;
}
static int vdpasim_resume(struct vdpa_device *vdpa)
{
struct vdpasim *vdpasim = vdpa_to_sim(vdpa);
int i;
spin_lock(&vdpasim->lock);
vdpasim->running = true;
if (vdpasim->pending_kick) {
/* Process pending descriptors */
for (i = 0; i < vdpasim->dev_attr.nvqs; ++i)
vdpasim_kick_vq(vdpa, i);
vdpasim->pending_kick = false;
}
spin_unlock(&vdpasim->lock);
return 0;
}
static size_t vdpasim_get_config_size(struct vdpa_device *vdpa)
{
struct vdpasim *vdpasim = vdpa_to_sim(vdpa);
@ -720,6 +747,7 @@ static const struct vdpa_config_ops vdpasim_config_ops = {
.set_status = vdpasim_set_status,
.reset = vdpasim_reset,
.suspend = vdpasim_suspend,
.resume = vdpasim_resume,
.get_config_size = vdpasim_get_config_size,
.get_config = vdpasim_get_config,
.set_config = vdpasim_set_config,
@ -753,6 +781,7 @@ static const struct vdpa_config_ops vdpasim_batch_config_ops = {
.set_status = vdpasim_set_status,
.reset = vdpasim_reset,
.suspend = vdpasim_suspend,
.resume = vdpasim_resume,
.get_config_size = vdpasim_get_config_size,
.get_config = vdpasim_get_config,
.set_config = vdpasim_set_config,

1
drivers/vdpa/vdpa_sim/vdpa_sim.h
View File

@ -67,6 +67,7 @@ struct vdpasim {
u64 features;
u32 groups;
bool running;
bool pending_kick;
/* spinlock to synchronize iommu table */
spinlock_t iommu_lock;
};