linux-kernel - Re: [PATCH 3/4] iommu/sva: Support reservation of global PASIDs

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Date:   Mon, 20 Mar 2023 14:22:38 -0300
From:   Jason Gunthorpe <jgg@...dia.com>
To:     "Tian, Kevin" <kevin.tian@...el.com>
Cc:     Jacob Pan <jacob.jun.pan@...ux.intel.com>,
        "Luck, Tony" <tony.luck@...el.com>,
        LKML <linux-kernel@...r.kernel.org>,
        "iommu@...ts.linux.dev" <iommu@...ts.linux.dev>,
        Lu Baolu <baolu.lu@...ux.intel.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>,
        "Zanussi, Tom" <tom.zanussi@...el.com>
Subject: Re: [PATCH 3/4] iommu/sva: Support reservation of global PASIDs

On Thu, Mar 16, 2023 at 07:25:17AM +0000, Tian, Kevin wrote:
 
> I still doubt 'reserve' is the right interface to define.
> 
> for DMA domain probably yes as it's static and one-off.
> 
> but thinking louder when the same driver starts to support SIOV we
> need allocating additional PASIDs on demand which is hardly to be
> fit in a reservation interface.

Sure, it is the same thing.

It is "reserve" in the sense they are not assigned to mm structs and
not used for SVA.

Jason