linux-kernel - RE: [PATCH v1 14/14] iommu/arm-smmu-v3: Add arm_smmu_cache_invalidate

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Message-ID: <BN9PR11MB5276135F28A099AB33A97E0E8C849@BN9PR11MB5276.namprd11.prod.outlook.com>
Date:   Fri, 24 Mar 2023 08:55:29 +0000
From:   "Tian, Kevin" <kevin.tian@...el.com>
To:     Nicolin Chen <nicolinc@...dia.com>,
        Jason Gunthorpe <jgg@...dia.com>
CC:     Robin Murphy <robin.murphy@....com>,
        "will@...nel.org" <will@...nel.org>,
        "eric.auger@...hat.com" <eric.auger@...hat.com>,
        "baolu.lu@...ux.intel.com" <baolu.lu@...ux.intel.com>,
        "joro@...tes.org" <joro@...tes.org>,
        "shameerali.kolothum.thodi@...wei.com" 
        <shameerali.kolothum.thodi@...wei.com>,
        "jean-philippe@...aro.org" <jean-philippe@...aro.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "iommu@...ts.linux.dev" <iommu@...ts.linux.dev>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH v1 14/14] iommu/arm-smmu-v3: Add
 arm_smmu_cache_invalidate_user

> From: Nicolin Chen <nicolinc@...dia.com>
> Sent: Wednesday, March 22, 2023 1:15 PM
> 
> >
> > Something has to generate CMD_ATC_INV.
> >
> > How do you plan to generate this from the hypervisor based on ASID
> > invalidations?
> >
> > The hypervisor doesn't know what ASIDs are connected to what SIDs to
> > generate the ATC?
> >
> > Intel is different, they know what devices the vDID is connected to,
> > so when they get a vDID invalidation they can elaborate it into a ATC
> > invalidation. ARM doesn't have that information.
> 
> I see. Perhaps vSMMU still needs to forward CMD_ATC_INV. And,

Ah that's quite a different story. 😊