netdev - Re: [RFC v1 6/8] vdpa: change the map/unmap process to support iommufd

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Date: Tue, 7 Nov 2023 14:14:32 +0800
From: Cindy Lu <lulu@...hat.com>
To: Yi Liu <yi.l.liu@...el.com>
Cc: jasowang@...hat.com, mst@...hat.com, jgg@...dia.com, 
	linux-kernel@...r.kernel.org, virtualization@...ts.linux-foundation.org, 
	netdev@...r.kernel.org
Subject: Re: [RFC v1 6/8] vdpa: change the map/unmap process to support iommufd

On Mon, Nov 6, 2023 at 4:52 PM Yi Liu <yi.l.liu@...el.com> wrote:
>
> On 2023/11/4 01:16, Cindy Lu wrote:
> > Add the check for iommufd_ictx,If vdpa don't have the iommufd_ictx
> > then will use the Legacy iommu domain pathway
> >
> > Signed-off-by: Cindy Lu <lulu@...hat.com>
> > ---
> >   drivers/vhost/vdpa.c | 43 ++++++++++++++++++++++++++++++++++++++-----
> >   1 file changed, 38 insertions(+), 5 deletions(-)
> >
> > diff --git a/drivers/vhost/vdpa.c b/drivers/vhost/vdpa.c
> > index dfaddd833364..0e2dba59e1ce 100644
> > --- a/drivers/vhost/vdpa.c
> > +++ b/drivers/vhost/vdpa.c
> > @@ -1067,9 +1067,6 @@ static int vhost_vdpa_map(struct vhost_vdpa *v, struct vhost_iotlb *iotlb,
> >               /* Legacy iommu domain pathway without IOMMUFD */
> >               r = iommu_map(v->domain, iova, pa, size,
> >                             perm_to_iommu_flags(perm), GFP_KERNEL);
> > -     } else {
> > -             r = iommu_map(v->domain, iova, pa, size,
> > -                           perm_to_iommu_flags(perm), GFP_KERNEL);
> >       }
> >       if (r) {
> >               vhost_iotlb_del_range(iotlb, iova, iova + size - 1);
> > @@ -1095,8 +1092,10 @@ static void vhost_vdpa_unmap(struct vhost_vdpa *v,
> >       if (ops->set_map) {
> >               if (!v->in_batch)
> >                       ops->set_map(vdpa, asid, iotlb);
> > +     } else if (!vdpa->iommufd_ictx) {
> > +             /* Legacy iommu domain pathway without IOMMUFD */
> > +             iommu_unmap(v->domain, iova, size);
> >       }
> > -
> >   }
> >
> >   static int vhost_vdpa_va_map(struct vhost_vdpa *v,
> > @@ -1149,7 +1148,36 @@ static int vhost_vdpa_va_map(struct vhost_vdpa *v,
> >
> >       return ret;
> >   }
> > +#if 0
> > +int vhost_pin_pages(struct vdpa_device *device, dma_addr_t iova, int npage,
> > +                 int prot, struct page **pages)
> > +{
> > +     if (!pages || !npage)
> > +             return -EINVAL;
> > +     //if (!device->config->dma_unmap)
> > +     //return -EINVAL;
> > +
> > +     if (0) { //device->iommufd_access) {
> > +             int ret;
> > +
> > +             if (iova > ULONG_MAX)
> > +                     return -EINVAL;
> >
> > +             ret = iommufd_access_pin_pages(
> > +                     device->iommufd_access, iova, npage * PAGE_SIZE, pages,
> > +                     (prot & IOMMU_WRITE) ? IOMMUFD_ACCESS_RW_WRITE : 0);
> > +             if (ret) {
> > +
> > +                     return ret;
> > +             }
> > +
> > +             return npage;
> > +     } else {
> > +             return pin_user_pages(iova, npage, prot, pages);
> > +     }
> > +     return -EINVAL;
> > +}
> > +#endif
>
> Is above code needed or not?
this code is for simulator， and this device still has some bugs I will
continue working in it,
Thanks
cindy
>
> >   static int vhost_vdpa_pa_map(struct vhost_vdpa *v,
> >                            struct vhost_iotlb *iotlb,
> >                            u64 iova, u64 size, u64 uaddr, u32 perm)
> > @@ -1418,9 +1446,13 @@ static void vhost_vdpa_free_domain(struct vhost_vdpa *v)
> >       struct device *dma_dev = vdpa_get_dma_dev(vdpa);
> >
> >       if (v->domain) {
> > -             iommu_detach_device(v->domain, dma_dev);
> > +             if (!vdpa->iommufd_ictx) {
> > +                     iommu_detach_device(v->domain, dma_dev);
> > +             }
> >               iommu_domain_free(v->domain);
> >       }
> > +     if (vdpa->iommufd_ictx)
> > +             vdpa_iommufd_unbind(vdpa);
> >
> >       v->domain = NULL;
> >   }
> > @@ -1645,6 +1677,7 @@ static int vhost_vdpa_probe(struct vdpa_device *vdpa)
> >       }
> >
> >       atomic_set(&v->opened, 0);
> > +     atomic_set(&vdpa->iommufd_users, 0);
> >       v->minor = minor;
> >       v->vdpa = vdpa;
> >       v->nvqs = vdpa->nvqs;
>
> --
> Regards,
> Yi Liu
>