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Date: Wed, 25 May 2022 10:54:19 +0800
From: Jason Wang <jasowang@...hat.com>
To: Eugenio Pérez <eperezma@...hat.com>
Cc: netdev <netdev@...r.kernel.org>,
virtualization <virtualization@...ts.linux-foundation.org>,
"Michael S. Tsirkin" <mst@...hat.com>, kvm <kvm@...r.kernel.org>,
linux-kernel <linux-kernel@...r.kernel.org>,
Parav Pandit <parav@...dia.com>,
Zhang Min <zhang.min9@....com.cn>,
Harpreet Singh Anand <hanand@...inx.com>,
Zhu Lingshan <lingshan.zhu@...el.com>, tanuj.kamde@....com,
"Dawar, Gautam" <gautam.dawar@....com>,
Christophe JAILLET <christophe.jaillet@...adoo.fr>,
Xie Yongji <xieyongji@...edance.com>,
Dinan Gunawardena <dinang@...inx.com>,
habetsm.xilinx@...il.com, Eli Cohen <elic@...dia.com>,
Pablo Cascon Katchadourian <pabloc@...inx.com>,
Laurent Vivier <lvivier@...hat.com>,
Dan Carpenter <dan.carpenter@...cle.com>,
Cindy Lu <lulu@...hat.com>,
Wu Zongyong <wuzongyong@...ux.alibaba.com>,
ecree.xilinx@...il.com, "Uminski, Piotr" <Piotr.Uminski@...el.com>,
Martin Porter <martinpo@...inx.com>,
Stefano Garzarella <sgarzare@...hat.com>,
Si-Wei Liu <si-wei.liu@...cle.com>,
Longpeng <longpeng2@...wei.com>,
Martin Petrus Hubertus Habets <martinh@...inx.com>
Subject: Re: [PATCH v2 4/4] vdpa_sim: Implement stop vdpa op
On Wed, May 25, 2022 at 1:06 AM Eugenio Pérez <eperezma@...hat.com> wrote:
>
> Implement stop operation for vdpa_sim devices, so vhost-vdpa will offer
> that backend feature and userspace can effectively stop 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).
>
> 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).
>
> In the future, we will provide features similar to
> VHOST_USER_GET_INFLIGHT_FD so the device can save pending operations.
>
> Signed-off-by: Eugenio Pérez <eperezma@...hat.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 50d721072beb..0515cf314bed 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_stop(struct vdpa_device *vdpa, bool stop)
> +{
> + struct vdpasim *vdpasim = vdpa_to_sim(vdpa);
> + int i;
> +
> + spin_lock(&vdpasim->lock);
> + vdpasim->running = !stop;
> + if (vdpasim->running) {
> + /* Check for missed buffers */
> + for (i = 0; i < vdpasim->dev_attr.nvqs; ++i)
> + vdpasim_kick_vq(vdpa, i);
> +
> + }
> + 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,
> + .stop = vdpasim_stop,
> .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,
> + .stop = vdpasim_stop,
> .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;
> +
Do we need to check vdpasim->running in vdpasim_kick_vq()?
Thanks
> if (!(vdpasim->status & VIRTIO_CONFIG_S_DRIVER_OK))
> goto out;
>
> --
> 2.27.0
>
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