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vdpa_sim: Implement suspend vdpa op 

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

This is a must before get virtqueue indexes (base) for live migration,
since the device could modify them after userland gets them. There are
individual ways to perform that action for some devices
(VHOST_NET_SET_BACKEND, VHOST_VSOCK_SET_RUNNING, ...) but there was no
way to perform it for any vhost device (and, in particular, vhost-vdpa).

Reviewed-by: Stefano Garzarella <sgarzare@redhat.com>
Signed-off-by: Eugenio Pérez <eperezma@redhat.com>
Message-Id: <20220810171512.2343333-5-eperezma@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Eugenio Pérez 2022-08-10 19:15:12 +02:00 committed by Michael S. Tsirkin
parent f345a0143b
commit 0c89e2a3a9
4 changed files with 21 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

14
drivers/vdpa/vdpa_sim/vdpa_sim.c
View File

@ -107,6 +107,7 @@ static void vdpasim_do_reset(struct vdpasim *vdpasim)
for (i = 0; i < vdpasim->dev_attr.nas; i++)
vhost_iotlb_reset(&vdpasim->iommu[i]);
vdpasim->running = true;
spin_unlock(&vdpasim->iommu_lock);
vdpasim->features = 0;
@ -505,6 +506,17 @@ static int vdpasim_reset(struct vdpa_device *vdpa)
return 0;
}
static int vdpasim_suspend(struct vdpa_device *vdpa)
{
struct vdpasim *vdpasim = vdpa_to_sim(vdpa);
spin_lock(&vdpasim->lock);
vdpasim->running = 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);
@ -694,6 +706,7 @@ static const struct vdpa_config_ops vdpasim_config_ops = {
.get_status = vdpasim_get_status,
.set_status = vdpasim_set_status,
.reset = vdpasim_reset,
.suspend = vdpasim_suspend,
.get_config_size = vdpasim_get_config_size,
.get_config = vdpasim_get_config,
.set_config = vdpasim_set_config,
@ -726,6 +739,7 @@ static const struct vdpa_config_ops vdpasim_batch_config_ops = {
.get_status = vdpasim_get_status,
.set_status = vdpasim_set_status,
.reset = vdpasim_reset,
.suspend = vdpasim_suspend,
.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

@ -66,6 +66,7 @@ struct vdpasim {
u32 generation;
u64 features;
u32 groups;
bool running;
/* spinlock to synchronize iommu table */
spinlock_t iommu_lock;
};

3
drivers/vdpa/vdpa_sim/vdpa_sim_blk.c
View File

@ -213,6 +213,9 @@ static void vdpasim_blk_work(struct work_struct *work)
if (!(vdpasim->status & VIRTIO_CONFIG_S_DRIVER_OK))
goto out;
if (!vdpasim->running)
goto out;
for (i = 0; i < VDPASIM_BLK_VQ_NUM; i++) {
struct vdpasim_virtqueue *vq = &vdpasim->vqs[i];
int reqs = 0;

3
drivers/vdpa/vdpa_sim/vdpa_sim_net.c
View File

@ -154,6 +154,9 @@ static void vdpasim_net_work(struct work_struct *work)
spin_lock(&vdpasim->lock);
if (!vdpasim->running)
goto out;
if (!(vdpasim->status & VIRTIO_CONFIG_S_DRIVER_OK))
goto out;