linux-kernel - Re: [PATCH v6 05/20] vfio: mdev: common lib code for setting up Interrupt Message Store

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Message-ID: <20210531152447.GT1002214@nvidia.com>
Date:   Mon, 31 May 2021 12:24:47 -0300
From:   Jason Gunthorpe <jgg@...dia.com>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     Dave Jiang <dave.jiang@...el.com>, alex.williamson@...hat.com,
        kwankhede@...dia.com, vkoul@...nel.org, megha.dey@...el.com,
        jacob.jun.pan@...el.com, ashok.raj@...el.com, yi.l.liu@...el.com,
        baolu.lu@...el.com, kevin.tian@...el.com, sanjay.k.kumar@...el.com,
        tony.luck@...el.com, dan.j.williams@...el.com,
        eric.auger@...hat.com, pbonzini@...hat.com,
        dmaengine@...r.kernel.org, linux-kernel@...r.kernel.org,
        kvm@...r.kernel.org
Subject: Re: [PATCH v6 05/20] vfio: mdev: common lib code for setting up
 Interrupt Message Store

On Mon, May 31, 2021 at 03:48:35PM +0200, Thomas Gleixner wrote:

> What's unclear to me is under which circumstances does the IMS interrupt
> require a PASID.
> 
>    1) Always
>    2) Use case dependent

It is just a weird IDXD thing. The PASID is serving as some VM
identifier in that HW, somehow, AFAIK.

Jason