linux-kernel - Re: [PATCH v8 07/10] iommufd: Fault-capable hwpt attach/detach/replace

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Message-ID: <CABQgh9E+AnuyJgcM9tf1gEOUqcC_QSrA__Xha9sKYZp=NVRwhQ@mail.gmail.com>
Date: Wed, 16 Oct 2024 09:58:36 +0800
From: Zhangfei Gao <zhangfei.gao@...aro.org>
To: Jason Gunthorpe <jgg@...pe.ca>
Cc: Lu Baolu <baolu.lu@...ux.intel.com>, Kevin Tian <kevin.tian@...el.com>, 
	Joerg Roedel <joro@...tes.org>, Will Deacon <will@...nel.org>, Robin Murphy <robin.murphy@....com>, 
	Jean-Philippe Brucker <jean-philippe@...aro.org>, Nicolin Chen <nicolinc@...dia.com>, 
	Yi Liu <yi.l.liu@...el.com>, Jacob Pan <jacob.jun.pan@...ux.intel.com>, 
	Joel Granados <j.granados@...sung.com>, iommu@...ts.linux.dev, 
	virtualization@...ts.linux-foundation.org, linux-kernel@...r.kernel.org, 
	Shameerali Kolothum Thodi <shameerali.kolothum.thodi@...wei.com>
Subject: Re: [PATCH v8 07/10] iommufd: Fault-capable hwpt attach/detach/replace

On Tue, 15 Oct 2024 at 20:54, Jason Gunthorpe <jgg@...pe.ca> wrote:
>
> On Tue, Oct 15, 2024 at 11:19:33AM +0800, Zhangfei Gao wrote:
> > > +static int iommufd_fault_iopf_enable(struct iommufd_device *idev)
> > > +{
> > > +       struct device *dev = idev->dev;
> > > +       int ret;
> > > +
> > > +       /*
> > > +        * Once we turn on PCI/PRI support for VF, the response failure code
> > > +        * should not be forwarded to the hardware due to PRI being a shared
> > > +        * resource between PF and VFs. There is no coordination for this
> > > +        * shared capability. This waits for a vPRI reset to recover.
> > > +        */
> > > +       if (dev_is_pci(dev) && to_pci_dev(dev)->is_virtfn)
> > > +               return -EINVAL;
> >
> > I am using the SMMUv3 stall feature, and need to forward this to hardware,
> > And now I am hacking to comment this check.
> > Any suggestions?
>
> Are you using PCI SRIOV and stall together?

Only use smmuv3 stall feature.

>
> > > +       mutex_lock(&idev->iopf_lock);
> > > +       /* Device iopf has already been on. */
> > > +       if (++idev->iopf_enabled > 1) {
> > > +               mutex_unlock(&idev->iopf_lock);
> > > +               return 0;
> > > +       }
> > > +
> > > +       ret = iommu_dev_enable_feature(dev, IOMMU_DEV_FEAT_IOPF);
> > > +       if (ret)
> > > +               --idev->iopf_enabled;
> > > +       mutex_unlock(&idev->iopf_lock);
> >
> > Also iommu_dev_enable_feature(idev->dev, IOMMU_DEV_FEAT_SVA); is required
> > In thinking how to add it properly.
>
> FEAT_SVA needs to be deleted, not added too.
>
> smmu-v3 needs some more fixing to move that
> arm_smmu_master_enable_sva() logic into domain attachment.

Will think about this, Thanks Jason

>
> Jason