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Date:   Sun, 3 May 2020 19:21:46 -0300
From:   Jason Gunthorpe <>
To:     "Dey, Megha" <>
Cc:     Dan Williams <>,
        Dave Jiang <>,
        Vinod Koul <>,,
        Bjorn Helgaas <>,
        "Rafael J. Wysocki" <>,
        Greg KH <>,
        Thomas Gleixner <>,
        "H. Peter Anvin" <>,
        Alex Williamson <>,
        Jacob jun Pan <>,
        "Raj, Ashok" <>, Yi L Liu <>,
        Baolu Lu <>,
        "Tian, Kevin" <>,
        Sanjay K Kumar <>,
        "Luck, Tony" <>, Jing Lin <>,,,,,
        Linux Kernel Mailing List <>,
        X86 ML <>,,
        KVM list <>
Subject: Re: [PATCH RFC 00/15] Add VFIO mediated device support and IMS
 support for the idxd driver.

On Fri, May 01, 2020 at 03:31:14PM -0700, Dey, Megha wrote:
> Hi Jason,
> On 4/23/2020 12:49 PM, Jason Gunthorpe wrote:
> > On Thu, Apr 23, 2020 at 12:17:50PM -0700, Dan Williams wrote:
> > 
> > > Per Megha's follow-up can you send the details about that other device
> > > and help clear a path for a device-specific MSI addr/data table
> > > format. Ever since HMM I've been sensitive, perhaps overly-sensitive,
> > > to claims about future upstream users. The fact that you have an
> > > additional use case is golden for pushing this into a common area and
> > > validating the scope of the proposed API.
> > 
> > I think I said it at plumbers, but yes, we are interested in this, and
> > would like dynamic MSI-like interrupts available to the driver (what
> > Intel calls IMS)
> > 
> So basically you are looking for a way to dynamically allocate the
> platform-msi interrupts, correct?

The basic high level interface here seems fine, which is bascially a
way for a driver to grab a bunch of platform-msi interrupts for its
own use
> Since I don't have access to any of the platform-msi devices, it is hard for
> me to test this code for other drivers expect idxd for now.
> Once I submit the next round of patches, after addressing all the comments,
> would it be possible for you to test this code for any of your devices?

Possibly, need to find time


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