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    Subject[PATCH v4 3/4] vhost-vdpa: uAPI to stop the device
    Date
    The ioctl adds support for stop the device from userspace.

    Signed-off-by: Eugenio Pérez <eperezma@redhat.com>
    ---
    drivers/vhost/vdpa.c | 18 ++++++++++++++++++
    include/uapi/linux/vhost.h | 14 ++++++++++++++
    2 files changed, 32 insertions(+)

    diff --git a/drivers/vhost/vdpa.c b/drivers/vhost/vdpa.c
    index 32713db5831d..d1d19555c4b7 100644
    --- a/drivers/vhost/vdpa.c
    +++ b/drivers/vhost/vdpa.c
    @@ -478,6 +478,21 @@ static long vhost_vdpa_get_vqs_count(struct vhost_vdpa *v, u32 __user *argp)
    return 0;
    }

    +static long vhost_vdpa_stop(struct vhost_vdpa *v, u32 __user *argp)
    +{
    + struct vdpa_device *vdpa = v->vdpa;
    + const struct vdpa_config_ops *ops = vdpa->config;
    + int stop;
    +
    + if (!ops->stop)
    + return -EOPNOTSUPP;
    +
    + if (copy_from_user(&stop, argp, sizeof(stop)))
    + return -EFAULT;
    +
    + return ops->stop(vdpa, stop);
    +}
    +
    static long vhost_vdpa_vring_ioctl(struct vhost_vdpa *v, unsigned int cmd,
    void __user *argp)
    {
    @@ -650,6 +665,9 @@ static long vhost_vdpa_unlocked_ioctl(struct file *filep,
    case VHOST_VDPA_GET_VQS_COUNT:
    r = vhost_vdpa_get_vqs_count(v, argp);
    break;
    + case VHOST_VDPA_STOP:
    + r = vhost_vdpa_stop(v, argp);
    + break;
    default:
    r = vhost_dev_ioctl(&v->vdev, cmd, argp);
    if (r == -ENOIOCTLCMD)
    diff --git a/include/uapi/linux/vhost.h b/include/uapi/linux/vhost.h
    index cab645d4a645..c7e47b29bf61 100644
    --- a/include/uapi/linux/vhost.h
    +++ b/include/uapi/linux/vhost.h
    @@ -171,4 +171,18 @@
    #define VHOST_VDPA_SET_GROUP_ASID _IOW(VHOST_VIRTIO, 0x7C, \
    struct vhost_vring_state)

    +/* Stop or resume a device so it does not process virtqueue requests anymore
    + *
    + * After the return of ioctl with stop != 0, the device must finish any
    + * pending operations like in flight requests. It must also preserve all
    + * the necessary state (the virtqueue vring base plus the possible device
    + * specific states) that is required for restoring in the future. The
    + * device must not change its configuration after that point.
    + *
    + * After the return of ioctl with stop == 0, the device can continue
    + * processing buffers as long as typical conditions are met (vq is enabled,
    + * DRIVER_OK status bit is enabled, etc).
    + */
    +#define VHOST_VDPA_STOP _IOW(VHOST_VIRTIO, 0x7D, int)
    +
    #endif
    --
    2.31.1
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