linux-kernel - RE: [PATCH v3 04/10] iommu/vt-d: Add helper to setup pasid nested translation

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Date:   Thu, 8 Jun 2023 03:35:50 +0000
From:   "Liu, Yi L" <yi.l.liu@...el.com>
To:     Baolu Lu <baolu.lu@...ux.intel.com>,
        "Tian, Kevin" <kevin.tian@...el.com>,
        "joro@...tes.org" <joro@...tes.org>,
        "alex.williamson@...hat.com" <alex.williamson@...hat.com>,
        "jgg@...dia.com" <jgg@...dia.com>,
        "robin.murphy@....com" <robin.murphy@....com>
CC:     "cohuck@...hat.com" <cohuck@...hat.com>,
        "eric.auger@...hat.com" <eric.auger@...hat.com>,
        "nicolinc@...dia.com" <nicolinc@...dia.com>,
        "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        "mjrosato@...ux.ibm.com" <mjrosato@...ux.ibm.com>,
        "chao.p.peng@...ux.intel.com" <chao.p.peng@...ux.intel.com>,
        "yi.y.sun@...ux.intel.com" <yi.y.sun@...ux.intel.com>,
        "peterx@...hat.com" <peterx@...hat.com>,
        "jasowang@...hat.com" <jasowang@...hat.com>,
        "shameerali.kolothum.thodi@...wei.com" 
        <shameerali.kolothum.thodi@...wei.com>,
        "lulu@...hat.com" <lulu@...hat.com>,
        "suravee.suthikulpanit@....com" <suravee.suthikulpanit@....com>,
        "iommu@...ts.linux.dev" <iommu@...ts.linux.dev>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-kselftest@...r.kernel.org" <linux-kselftest@...r.kernel.org>,
        "Duan, Zhenzhong" <zhenzhong.duan@...el.com>,
        Jacob Pan <jacob.jun.pan@...ux.intel.com>
Subject: RE: [PATCH v3 04/10] iommu/vt-d: Add helper to setup pasid nested
 translation

> From: Baolu Lu <baolu.lu@...ux.intel.com>
> Sent: Friday, May 26, 2023 12:16 PM
> On 5/24/23 3:16 PM, Tian, Kevin wrote:
> >> From: Yi Liu <yi.l.liu@...el.com>
> >> Sent: Thursday, May 11, 2023 10:51 PM
> >>
> >> +	/*
> >> +	 * Memory type is only applicable to devices inside processor
> >> coherent
> >> +	 * domain. Will add MTS support once coherent devices are available.
> >> +	 */
> >> +	if (s1_cfg->flags & IOMMU_VTD_PGTBL_MTS_MASK) {
> >> +		pr_warn_ratelimited("No memory type support %s\n",
> >> +				    iommu->name);
> >> +		return -EINVAL;
> >> +	}
> >
> > If it's unsupported why exposing them in the uAPI at this point?
> 
> Agreed. We can remove this flag for now.

So we shall remove the below flags in uapi as well, is it?

+#define IOMMU_VTD_PGTBL_MTS_MASK	(IOMMU_VTD_PGTBL_CD | \
+					 IOMMU_VTD_PGTBL_EMTE | \
+					 IOMMU_VTD_PGTBL_PCD | \
+					 IOMMU_VTD_PGTBL_PWT)

Regards,
Yi Liu