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

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Date:   Mon, 6 Mar 2023 14:19:08 -0400
From:   Jason Gunthorpe <jgg@...dia.com>
To:     Jacob Pan <jacob.jun.pan@...ux.intel.com>
Cc:     "Tian, Kevin" <kevin.tian@...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>,
        "Luck, Tony" <tony.luck@...el.com>,
        "Zanussi, Tom" <tom.zanussi@...el.com>
Subject: Re: [PATCH 3/4] iommu/sva: Support reservation of global PASIDs

On Mon, Mar 06, 2023 at 09:57:59AM -0800, Jacob Pan wrote:

> ENQCMDS does not have the restriction of using a single CPU MSR to store
> PASIDs, PASID is supplied to the instruction operand. 

Huh? That isn't what it says in the programming manual. It says the
PASID only comes from the IA32_PASID msr and the only two operands are
the destination MMIO and the memory source for the rest of the payload.

Jason