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vdpa: Track device suspended state

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Set vdpa device suspended state on successful suspend. Clear it on
successful resume and reset.

The state will be locked by the vhost_vdpa mutex. The mutex is taken
during suspend, resume and reset in vhost_vdpa_unlocked_ioctl. The
exception is vhost_vdpa_open which does a device reset but that should
be safe because it can only happen before the other ops.

Signed-off-by: Dragos Tatulea <dtatulea@nvidia.com>
Suggested-by: Eugenio Pérez <eperezma@redhat.com>
Message-Id: <20231225134210.151540-2-dtatulea@nvidia.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Dragos Tatulea 2023-12-25 15:42:09 +02:00 committed by Michael S. Tsirkin
parent 95e7249691
commit c7e194402b
1 changed files with 15 additions and 2 deletions
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17
drivers/vhost/vdpa.c
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@ -59,6 +59,7 @@ struct vhost_vdpa {
int in_batch; int in_batch;
struct vdpa_iova_range range; struct vdpa_iova_range range;
u32 batch_asid; u32 batch_asid;
bool suspended;
}; };
static DEFINE_IDA(vhost_vdpa_ida); static DEFINE_IDA(vhost_vdpa_ida);
@ -232,6 +233,8 @@ static int _compat_vdpa_reset(struct vhost_vdpa *v)
struct vdpa_device *vdpa = v->vdpa; struct vdpa_device *vdpa = v->vdpa;
u32 flags = 0; u32 flags = 0;
v->suspended = false;
if (v->vdev.vqs) { if (v->vdev.vqs) {
flags |= !vhost_backend_has_feature(v->vdev.vqs[0], flags |= !vhost_backend_has_feature(v->vdev.vqs[0],
VHOST_BACKEND_F_IOTLB_PERSIST) ? VHOST_BACKEND_F_IOTLB_PERSIST) ?
@ -590,11 +593,16 @@ static long vhost_vdpa_suspend(struct vhost_vdpa *v)
{ {
struct vdpa_device *vdpa = v->vdpa; struct vdpa_device *vdpa = v->vdpa;
const struct vdpa_config_ops *ops = vdpa->config; const struct vdpa_config_ops *ops = vdpa->config;
int ret;
if (!ops->suspend) if (!ops->suspend)
return -EOPNOTSUPP; return -EOPNOTSUPP;
return ops->suspend(vdpa); ret = ops->suspend(vdpa);
if (!ret)
v->suspended = true;
return ret;
} }
/* After a successful return of this ioctl the device resumes processing /* After a successful return of this ioctl the device resumes processing
@ -605,11 +613,16 @@ static long vhost_vdpa_resume(struct vhost_vdpa *v)
{ {
struct vdpa_device *vdpa = v->vdpa; struct vdpa_device *vdpa = v->vdpa;
const struct vdpa_config_ops *ops = vdpa->config; const struct vdpa_config_ops *ops = vdpa->config;
int ret;
if (!ops->resume) if (!ops->resume)
return -EOPNOTSUPP; return -EOPNOTSUPP;
return ops->resume(vdpa); ret = ops->resume(vdpa);
if (!ret)
v->suspended = false;
return ret;
} }
static long vhost_vdpa_vring_ioctl(struct vhost_vdpa *v, unsigned int cmd, static long vhost_vdpa_vring_ioctl(struct vhost_vdpa *v, unsigned int cmd,