linux-kernel - Re: [PATCH v1 0/8] Add IO page table replacement support

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Message-ID: <Y90ieTgl7I2GZfsX@ziepe.ca>
Date:   Fri, 3 Feb 2023 11:04:25 -0400
From:   Jason Gunthorpe <jgg@...dia.com>
To:     "Tian, Kevin" <kevin.tian@...el.com>
Cc:     Nicolin Chen <nicolinc@...dia.com>,
        "joro@...tes.org" <joro@...tes.org>,
        "will@...nel.org" <will@...nel.org>,
        "robin.murphy@....com" <robin.murphy@....com>,
        "alex.williamson@...hat.com" <alex.williamson@...hat.com>,
        "shuah@...nel.org" <shuah@...nel.org>,
        "Liu, Yi L" <yi.l.liu@...el.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "iommu@...ts.linux.dev" <iommu@...ts.linux.dev>,
        "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        "linux-kselftest@...r.kernel.org" <linux-kselftest@...r.kernel.org>,
        "baolu.lu@...ux.intel.com" <baolu.lu@...ux.intel.com>
Subject: Re: [PATCH v1 0/8] Add IO page table replacement support

On Fri, Feb 03, 2023 at 08:09:30AM +0000, Tian, Kevin wrote:
> > From: Nicolin Chen <nicolinc@...dia.com>
> > Sent: Thursday, February 2, 2023 3:05 PM
> > 
> > QEMU with this feature should have the vIOMMU maintain a cache of the
> > guest io page table addresses and assign a unique IOAS to each unique
> > guest page table.
> 
> I didn't get why we impose such requirement to userspace.

I read this as implementation guidance for qemu. qemu can do what it
wants of course

Jason