linux-kernel - Re: [PATCH 1/4] iommu/vt-d: Implement set device pasid op for default domain

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Date:   Fri, 3 Mar 2023 08:35:12 -0800
From:   Jacob Pan <jacob.jun.pan@...ux.intel.com>
To:     "Tian, Kevin" <kevin.tian@...el.com>
Cc:     Baolu Lu <baolu.lu@...ux.intel.com>,
        LKML <linux-kernel@...r.kernel.org>,
        "iommu@...ts.linux.dev" <iommu@...ts.linux.dev>,
        Jason Gunthorpe <jgg@...dia.com>,
        Joerg Roedel <joro@...tes.org>,
        "dmaengine@...r.kernel.org" <dmaengine@...r.kernel.org>,
        "vkoul@...nel.org" <vkoul@...nel.org>,
        Robin Murphy <robin.murphy@....com>,
        Will Deacon <will@...nel.org>,
        "David Woodhouse" <dwmw2@...radead.org>,
        "Raj, Ashok" <ashok.raj@...el.com>,
        "Liu, Yi L" <yi.l.liu@...el.com>,
        "Yu, Fenghua" <fenghua.yu@...el.com>,
        "Jiang, Dave" <dave.jiang@...el.com>,
        "Luck, Tony" <tony.luck@...el.com>,
        "Zanussi, Tom" <tom.zanussi@...el.com>,
        jacob.jun.pan@...ux.intel.com
Subject: Re: [PATCH 1/4] iommu/vt-d: Implement set device pasid op for
 default domain

Hi Kevin,

On Fri, 3 Mar 2023 05:38:19 +0000, "Tian, Kevin" <kevin.tian@...el.com>
wrote:

> > From: Baolu Lu <baolu.lu@...ux.intel.com>
> > Sent: Thursday, March 2, 2023 10:07 PM
> >   
> > > +
> > > +	if (hw_pass_through && domain_type_is_si(dmar_domain))
> > > +		ret = intel_pasid_setup_pass_through(iommu,
> > > dmar_domain,
> > > +						     dev, pasid);
> > > +	else if (dmar_domain->use_first_level)
> > > +		ret = domain_setup_first_level(iommu, dmar_domain,
> > > +					       dev, pasid);
> > > +	else
> > > +		ret = intel_pasid_setup_second_level(iommu,
> > > dmar_domain,
> > > +						     dev, pasid);
> > > +
> > > +	return ret;
> > > +}  
> > 
> > Do you need to consider pasid cache invalidation?
> >   
> 
> To avoid confusion this is not about invalidation of pasid cache itself
> which should be covered by above setup functions already.
> 
> Here actually means per-PASID invalidation in iotlb and devtlb. Today
> only RID is tracked per domain for invalidation. it needs extension to
> walk attached pasid too.

Yes, will add.

For the set up path, there is no need to flush IOTLBs,  because we're going
from non present to present.

On the remove path, IOTLB flush should be covered when device driver
calls iommu_detach_device_pasid(). Covered with this patch.


Thanks,

Jacob