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Message-ID: <CACycT3vXCaSc9Er3yzRAzf8-eEFgpQYmEaDy3129xPdb4AFdmA@mail.gmail.com>
Date: Wed, 20 Jan 2021 15:10:56 +0800
From: Yongji Xie <xieyongji@...edance.com>
To: Jason Wang <jasowang@...hat.com>
Cc: "Michael S. Tsirkin" <mst@...hat.com>,
Stefan Hajnoczi <stefanha@...hat.com>, sgarzare@...hat.com,
Parav Pandit <parav@...dia.com>, Bob Liu <bob.liu@...cle.com>,
Christoph Hellwig <hch@...radead.org>,
Randy Dunlap <rdunlap@...radead.org>,
Matthew Wilcox <willy@...radead.org>, viro@...iv.linux.org.uk,
axboe@...nel.dk, bcrl@...ck.org, Jonathan Corbet <corbet@....net>,
virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org,
kvm@...r.kernel.org, linux-aio@...ck.org,
linux-fsdevel@...r.kernel.org
Subject: Re: Re: [RFC v3 05/11] vdpa: shared virtual addressing support
On Wed, Jan 20, 2021 at 1:55 PM Jason Wang <jasowang@...hat.com> wrote:
>
>
> On 2021/1/19 下午12:59, Xie Yongji wrote:
> > This patches introduces SVA (Shared Virtual Addressing)
> > support for vDPA device. During vDPA device allocation,
> > vDPA device driver needs to indicate whether SVA is
> > supported by the device. Then vhost-vdpa bus driver
> > will not pin user page and transfer userspace virtual
> > address instead of physical address during DMA mapping.
> >
> > Suggested-by: Jason Wang <jasowang@...hat.com>
> > Signed-off-by: Xie Yongji <xieyongji@...edance.com>
> > ---
> > drivers/vdpa/ifcvf/ifcvf_main.c | 2 +-
> > drivers/vdpa/mlx5/net/mlx5_vnet.c | 2 +-
> > drivers/vdpa/vdpa.c | 5 ++++-
> > drivers/vdpa/vdpa_sim/vdpa_sim.c | 3 ++-
> > drivers/vhost/vdpa.c | 35 +++++++++++++++++++++++------------
> > include/linux/vdpa.h | 10 +++++++---
> > 6 files changed, 38 insertions(+), 19 deletions(-)
> >
> > diff --git a/drivers/vdpa/ifcvf/ifcvf_main.c b/drivers/vdpa/ifcvf/ifcvf_main.c
> > index 23474af7da40..95c4601f82f5 100644
> > --- a/drivers/vdpa/ifcvf/ifcvf_main.c
> > +++ b/drivers/vdpa/ifcvf/ifcvf_main.c
> > @@ -439,7 +439,7 @@ static int ifcvf_probe(struct pci_dev *pdev, const struct pci_device_id *id)
> >
> > adapter = vdpa_alloc_device(struct ifcvf_adapter, vdpa,
> > dev, &ifc_vdpa_ops,
> > - IFCVF_MAX_QUEUE_PAIRS * 2, NULL);
> > + IFCVF_MAX_QUEUE_PAIRS * 2, NULL, false);
> > if (adapter == NULL) {
> > IFCVF_ERR(pdev, "Failed to allocate vDPA structure");
> > return -ENOMEM;
> > diff --git a/drivers/vdpa/mlx5/net/mlx5_vnet.c b/drivers/vdpa/mlx5/net/mlx5_vnet.c
> > index 77595c81488d..05988d6907f2 100644
> > --- a/drivers/vdpa/mlx5/net/mlx5_vnet.c
> > +++ b/drivers/vdpa/mlx5/net/mlx5_vnet.c
> > @@ -1959,7 +1959,7 @@ static int mlx5v_probe(struct auxiliary_device *adev,
> > max_vqs = min_t(u32, max_vqs, MLX5_MAX_SUPPORTED_VQS);
> >
> > ndev = vdpa_alloc_device(struct mlx5_vdpa_net, mvdev.vdev, mdev->device, &mlx5_vdpa_ops,
> > - 2 * mlx5_vdpa_max_qps(max_vqs), NULL);
> > + 2 * mlx5_vdpa_max_qps(max_vqs), NULL, false);
> > if (IS_ERR(ndev))
> > return PTR_ERR(ndev);
> >
> > diff --git a/drivers/vdpa/vdpa.c b/drivers/vdpa/vdpa.c
> > index 32bd48baffab..50cab930b2e5 100644
> > --- a/drivers/vdpa/vdpa.c
> > +++ b/drivers/vdpa/vdpa.c
> > @@ -72,6 +72,7 @@ static void vdpa_release_dev(struct device *d)
> > * @nvqs: number of virtqueues supported by this device
> > * @size: size of the parent structure that contains private data
> > * @name: name of the vdpa device; optional.
> > + * @sva: indicate whether SVA (Shared Virtual Addressing) is supported
> > *
> > * Driver should use vdpa_alloc_device() wrapper macro instead of
> > * using this directly.
> > @@ -81,7 +82,8 @@ static void vdpa_release_dev(struct device *d)
> > */
> > struct vdpa_device *__vdpa_alloc_device(struct device *parent,
> > const struct vdpa_config_ops *config,
> > - int nvqs, size_t size, const char *name)
> > + int nvqs, size_t size, const char *name,
> > + bool sva)
> > {
> > struct vdpa_device *vdev;
> > int err = -EINVAL;
> > @@ -108,6 +110,7 @@ struct vdpa_device *__vdpa_alloc_device(struct device *parent,
> > vdev->config = config;
> > vdev->features_valid = false;
> > vdev->nvqs = nvqs;
> > + vdev->sva = sva;
> >
> > if (name)
> > err = dev_set_name(&vdev->dev, "%s", name);
> > diff --git a/drivers/vdpa/vdpa_sim/vdpa_sim.c b/drivers/vdpa/vdpa_sim/vdpa_sim.c
> > index 85776e4e6749..03c796873a6b 100644
> > --- a/drivers/vdpa/vdpa_sim/vdpa_sim.c
> > +++ b/drivers/vdpa/vdpa_sim/vdpa_sim.c
> > @@ -367,7 +367,8 @@ static struct vdpasim *vdpasim_create(const char *name)
> > else
> > ops = &vdpasim_net_config_ops;
> >
> > - vdpasim = vdpa_alloc_device(struct vdpasim, vdpa, NULL, ops, VDPASIM_VQ_NUM, name);
> > + vdpasim = vdpa_alloc_device(struct vdpasim, vdpa, NULL, ops,
> > + VDPASIM_VQ_NUM, name, false);
> > if (!vdpasim)
> > goto err_alloc;
> >
> > diff --git a/drivers/vhost/vdpa.c b/drivers/vhost/vdpa.c
> > index 4a241d380c40..36b6950ba37f 100644
> > --- a/drivers/vhost/vdpa.c
> > +++ b/drivers/vhost/vdpa.c
> > @@ -486,21 +486,25 @@ static long vhost_vdpa_unlocked_ioctl(struct file *filep,
> > static void vhost_vdpa_iotlb_unmap(struct vhost_vdpa *v, u64 start, u64 last)
> > {
> > struct vhost_dev *dev = &v->vdev;
> > + struct vdpa_device *vdpa = v->vdpa;
> > struct vhost_iotlb *iotlb = dev->iotlb;
> > struct vhost_iotlb_map *map;
> > struct page *page;
> > unsigned long pfn, pinned;
> >
> > while ((map = vhost_iotlb_itree_first(iotlb, start, last)) != NULL) {
> > - pinned = map->size >> PAGE_SHIFT;
> > - for (pfn = map->addr >> PAGE_SHIFT;
> > - pinned > 0; pfn++, pinned--) {
> > - page = pfn_to_page(pfn);
> > - if (map->perm & VHOST_ACCESS_WO)
> > - set_page_dirty_lock(page);
> > - unpin_user_page(page);
> > + if (!vdpa->sva) {
> > + pinned = map->size >> PAGE_SHIFT;
> > + for (pfn = map->addr >> PAGE_SHIFT;
> > + pinned > 0; pfn++, pinned--) {
> > + page = pfn_to_page(pfn);
> > + if (map->perm & VHOST_ACCESS_WO)
> > + set_page_dirty_lock(page);
> > + unpin_user_page(page);
> > + }
> > + atomic64_sub(map->size >> PAGE_SHIFT,
> > + &dev->mm->pinned_vm);
> > }
> > - atomic64_sub(map->size >> PAGE_SHIFT, &dev->mm->pinned_vm);
> > vhost_iotlb_map_free(iotlb, map);
> > }
> > }
> > @@ -558,13 +562,15 @@ static int vhost_vdpa_map(struct vhost_vdpa *v,
> > r = iommu_map(v->domain, iova, pa, size,
> > perm_to_iommu_flags(perm));
> > }
> > -
> > - if (r)
> > + if (r) {
> > vhost_iotlb_del_range(dev->iotlb, iova, iova + size - 1);
> > - else
> > + return r;
> > + }
> > +
> > + if (!vdpa->sva)
> > atomic64_add(size >> PAGE_SHIFT, &dev->mm->pinned_vm);
> >
> > - return r;
> > + return 0;
> > }
> >
> > static void vhost_vdpa_unmap(struct vhost_vdpa *v, u64 iova, u64 size)
> > @@ -589,6 +595,7 @@ static int vhost_vdpa_process_iotlb_update(struct vhost_vdpa *v,
> > struct vhost_iotlb_msg *msg)
> > {
> > struct vhost_dev *dev = &v->vdev;
> > + struct vdpa_device *vdpa = v->vdpa;
> > struct vhost_iotlb *iotlb = dev->iotlb;
> > struct page **page_list;
> > unsigned long list_size = PAGE_SIZE / sizeof(struct page *);
> > @@ -607,6 +614,10 @@ static int vhost_vdpa_process_iotlb_update(struct vhost_vdpa *v,
> > msg->iova + msg->size - 1))
> > return -EEXIST;
> >
> > + if (vdpa->sva)
> > + return vhost_vdpa_map(v, msg->iova, msg->size,
> > + msg->uaddr, msg->perm);
> > +
> > /* Limit the use of memory for bookkeeping */
> > page_list = (struct page **) __get_free_page(GFP_KERNEL);
> > if (!page_list)
> > diff --git a/include/linux/vdpa.h b/include/linux/vdpa.h
> > index cb5a3d847af3..f86869651614 100644
> > --- a/include/linux/vdpa.h
> > +++ b/include/linux/vdpa.h
> > @@ -44,6 +44,7 @@ struct vdpa_parent_dev;
> > * @config: the configuration ops for this device.
> > * @index: device index
> > * @features_valid: were features initialized? for legacy guests
> > + * @sva: indicate whether SVA (Shared Virtual Addressing) is supported
>
>
> Rethink about this. I think we probably need a better name other than
> "sva" since kernel already use that for shared virtual address space.
> But actually we don't the whole virtual address space.
>
This flag is used to tell vhost-vdpa bus driver to transfer virtual
addresses instead of physical addresses. So how about "use_va“,
”need_va" or "va“?
> And I guess this can not work for the device that use platform IOMMU, so
> we should check and fail if sva && !(dma_map || set_map).
>
Agree.
Thanks,
Yongji
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