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SubjectRe: [PATCH v6 4/4] vdpa_sim: Implement suspend vdpa op
On Wed, Jun 29, 2022 at 6:18 AM Jason Wang <jasowang@redhat.com> wrote:
>
> On Fri, Jun 24, 2022 at 12:08 AM Eugenio Pérez <eperezma@redhat.com> wrote:
> >
> > 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>
> > ---
> > drivers/vdpa/vdpa_sim/vdpa_sim.c | 21 +++++++++++++++++++++
> > drivers/vdpa/vdpa_sim/vdpa_sim.h | 1 +
> > drivers/vdpa/vdpa_sim/vdpa_sim_blk.c | 3 +++
> > drivers/vdpa/vdpa_sim/vdpa_sim_net.c | 3 +++
> > 4 files changed, 28 insertions(+)
> >
> > diff --git a/drivers/vdpa/vdpa_sim/vdpa_sim.c b/drivers/vdpa/vdpa_sim/vdpa_sim.c
> > index 0f2865899647..213883487f9b 100644
> > --- a/drivers/vdpa/vdpa_sim/vdpa_sim.c
> > +++ b/drivers/vdpa/vdpa_sim/vdpa_sim.c
> > @@ -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 +506,24 @@ 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);
> > + int i;
> > +
> > + spin_lock(&vdpasim->lock);
> > + vdpasim->running = false;
> > + if (vdpasim->running) {
> > + /* Check for missed buffers */
> > + for (i = 0; i < vdpasim->dev_attr.nvqs; ++i)
> > + vdpasim_kick_vq(vdpa, i);
>
> This seems only valid if we allow resuming?
>

Right, deleting for v7.

Thanks!

> Thanks
>
> > +
> > + }
> > + 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 +713,7 @@ 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 +746,7 @@ 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,
> > diff --git a/drivers/vdpa/vdpa_sim/vdpa_sim.h b/drivers/vdpa/vdpa_sim/vdpa_sim.h
> > index 622782e92239..061986f30911 100644
> > --- a/drivers/vdpa/vdpa_sim/vdpa_sim.h
> > +++ b/drivers/vdpa/vdpa_sim/vdpa_sim.h
> > @@ -66,6 +66,7 @@ struct vdpasim {
> > u32 generation;
> > u64 features;
> > u32 groups;
> > + bool running;
> > /* spinlock to synchronize iommu table */
> > spinlock_t iommu_lock;
> > };
> > diff --git a/drivers/vdpa/vdpa_sim/vdpa_sim_blk.c b/drivers/vdpa/vdpa_sim/vdpa_sim_blk.c
> > index 42d401d43911..bcdb1982c378 100644
> > --- a/drivers/vdpa/vdpa_sim/vdpa_sim_blk.c
> > +++ b/drivers/vdpa/vdpa_sim/vdpa_sim_blk.c
> > @@ -204,6 +204,9 @@ 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];
> >
> > diff --git a/drivers/vdpa/vdpa_sim/vdpa_sim_net.c b/drivers/vdpa/vdpa_sim/vdpa_sim_net.c
> > index 5125976a4df8..886449e88502 100644
> > --- a/drivers/vdpa/vdpa_sim/vdpa_sim_net.c
> > +++ b/drivers/vdpa/vdpa_sim/vdpa_sim_net.c
> > @@ -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;
> >
> > --
> > 2.31.1
> >
>

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