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Message-ID: <DM5PR11MB14359BEC34E22DD1921A39D4C3760@DM5PR11MB1435.namprd11.prod.outlook.com>
Date: Thu, 23 Jul 2020 12:05:52 +0000
From: "Liu, Yi L" <yi.l.liu@...el.com>
To: Auger Eric <eric.auger@...hat.com>,
"alex.williamson@...hat.com" <alex.williamson@...hat.com>,
"baolu.lu@...ux.intel.com" <baolu.lu@...ux.intel.com>,
"joro@...tes.org" <joro@...tes.org>
CC: "Tian, Kevin" <kevin.tian@...el.com>,
"jacob.jun.pan@...ux.intel.com" <jacob.jun.pan@...ux.intel.com>,
"Raj, Ashok" <ashok.raj@...el.com>,
"Tian, Jun J" <jun.j.tian@...el.com>,
"Sun, Yi Y" <yi.y.sun@...el.com>,
"jean-philippe@...aro.org" <jean-philippe@...aro.org>,
"peterx@...hat.com" <peterx@...hat.com>,
"Wu, Hao" <hao.wu@...el.com>,
"stefanha@...il.com" <stefanha@...il.com>,
"iommu@...ts.linux-foundation.org" <iommu@...ts.linux-foundation.org>,
"kvm@...r.kernel.org" <kvm@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH v5 12/15] vfio/type1: Add vSVA support for IOMMU-backed
mdevs
Hi Eric,
> From: Auger Eric < eric.auger@...hat.com>
> Sent: Monday, July 20, 2020 8:22 PM
>
> Yi,
>
> On 7/12/20 1:21 PM, Liu Yi L wrote:
> > Recent years, mediated device pass-through framework (e.g. vfio-mdev)
> > is used to achieve flexible device sharing across domains (e.g. VMs).
> > Also there are hardware assisted mediated pass-through solutions from
> > platform vendors. e.g. Intel VT-d scalable mode which supports Intel
> > Scalable I/O Virtualization technology. Such mdevs are called IOMMU-
> > backed mdevs as there are IOMMU enforced DMA isolation for such mdevs.
> there is IOMMU enforced DMA isolation
> > In kernel, IOMMU-backed mdevs are exposed to IOMMU layer by aux-domain
> > concept, which means mdevs are protected by an iommu domain which is
> > auxiliary to the domain that the kernel driver primarily uses for DMA
> > API. Details can be found in the KVM presentation as below:
> >
> > https://events19.linuxfoundation.org/wp-content/uploads/2017/12/\
> > Hardware-Assisted-Mediated-Pass-Through-with-VFIO-Kevin-Tian-Intel.pdf
> >
> > This patch extends NESTING_IOMMU ops to IOMMU-backed mdev devices. The
> > main requirement is to use the auxiliary domain associated with mdev.
>
> So as a result vSVM becomes functional for scalable mode mediated devices, right?
yes. as long as the mediated devices reports PASID capability.
> >
> > Cc: Kevin Tian <kevin.tian@...el.com>
> > CC: Jacob Pan <jacob.jun.pan@...ux.intel.com>
> > CC: Jun Tian <jun.j.tian@...el.com>
> > Cc: Alex Williamson <alex.williamson@...hat.com>
> > Cc: Eric Auger <eric.auger@...hat.com>
> > Cc: Jean-Philippe Brucker <jean-philippe@...aro.org>
> > Cc: Joerg Roedel <joro@...tes.org>
> > Cc: Lu Baolu <baolu.lu@...ux.intel.com>
> > Signed-off-by: Liu Yi L <yi.l.liu@...el.com>
> > ---
> > v1 -> v2:
> > *) check the iommu_device to ensure the handling mdev is IOMMU-backed
> > ---
> > drivers/vfio/vfio_iommu_type1.c | 39
> > +++++++++++++++++++++++++++++++++++----
> > 1 file changed, 35 insertions(+), 4 deletions(-)
> >
> > diff --git a/drivers/vfio/vfio_iommu_type1.c
> > b/drivers/vfio/vfio_iommu_type1.c index 960cc59..f1f1ae2 100644
> > --- a/drivers/vfio/vfio_iommu_type1.c
> > +++ b/drivers/vfio/vfio_iommu_type1.c
> > @@ -2373,20 +2373,41 @@ static int vfio_iommu_resv_refresh(struct
> vfio_iommu *iommu,
> > return ret;
> > }
> >
> > +static struct device *vfio_get_iommu_device(struct vfio_group *group,
> > + struct device *dev)
> > +{
> > + if (group->mdev_group)
> > + return vfio_mdev_get_iommu_device(dev);
> > + else
> > + return dev;
> > +}
> > +
> > static int vfio_dev_bind_gpasid_fn(struct device *dev, void *data) {
> > struct domain_capsule *dc = (struct domain_capsule *)data;
> > unsigned long arg = *(unsigned long *)dc->data;
> > + struct device *iommu_device;
> > +
> > + iommu_device = vfio_get_iommu_device(dc->group, dev);
> > + if (!iommu_device)
> > + return -EINVAL;
> >
> > - return iommu_sva_bind_gpasid(dc->domain, dev, (void __user *)arg);
> > + return iommu_sva_bind_gpasid(dc->domain, iommu_device,
> > + (void __user *)arg);
> > }
> >
> > static int vfio_dev_unbind_gpasid_fn(struct device *dev, void *data)
> > {
> > struct domain_capsule *dc = (struct domain_capsule *)data;
> > unsigned long arg = *(unsigned long *)dc->data;
> > + struct device *iommu_device;
> >
> > - iommu_sva_unbind_gpasid(dc->domain, dev, (void __user *)arg);
> > + iommu_device = vfio_get_iommu_device(dc->group, dev);
> > + if (!iommu_device)
> > + return -EINVAL;
> > +
> > + iommu_sva_unbind_gpasid(dc->domain, iommu_device,
> > + (void __user *)arg);
> > return 0;
> > }
> >
> > @@ -2395,8 +2416,13 @@ static int __vfio_dev_unbind_gpasid_fn(struct device
> *dev, void *data)
> > struct domain_capsule *dc = (struct domain_capsule *)data;
> > struct iommu_gpasid_bind_data *unbind_data =
> > (struct iommu_gpasid_bind_data *)dc->data;
> > + struct device *iommu_device;
> > +
> > + iommu_device = vfio_get_iommu_device(dc->group, dev);
> > + if (!iommu_device)
> > + return -EINVAL;
> >
> > - __iommu_sva_unbind_gpasid(dc->domain, dev, unbind_data);
> > + __iommu_sva_unbind_gpasid(dc->domain, iommu_device, unbind_data);
> > return 0;
> > }
> >
> > @@ -3077,8 +3103,13 @@ static int vfio_dev_cache_invalidate_fn(struct
> > device *dev, void *data) {
> > struct domain_capsule *dc = (struct domain_capsule *)data;
> > unsigned long arg = *(unsigned long *)dc->data;
> > + struct device *iommu_device;
> > +
> > + iommu_device = vfio_get_iommu_device(dc->group, dev);
> > + if (!iommu_device)
> > + return -EINVAL;
> >
> > - iommu_cache_invalidate(dc->domain, dev, (void __user *)arg);
> > + iommu_cache_invalidate(dc->domain, iommu_device, (void __user
> > +*)arg);
> > return 0;
> > }
> >
> >
> Besides,
>
> Looks grood to me
>
> Reviewed-by: Eric Auger <eric.auger@...hat.com>
thanks :-)
Regards,
Yi Liu
> Eric
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