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 05:38:19 +0000
From:   "Tian, Kevin" <kevin.tian@...el.com>
To:     Baolu Lu <baolu.lu@...ux.intel.com>,
        Jacob Pan <jacob.jun.pan@...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>
CC:     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>
Subject: RE: [PATCH 1/4] iommu/vt-d: Implement set device pasid op for default
 domain

> 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.