linux-kernel - Re: [PATCH v2 00/10] Add IO page table replacement support

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Message-ID: <Y+UbmJ8Y1lT/mKSl@Asurada-Nvidia>
Date:   Thu, 9 Feb 2023 08:13:12 -0800
From:   Nicolin Chen <nicolinc@...dia.com>
To:     "Tian, Kevin" <kevin.tian@...el.com>
CC:     "jgg@...dia.com" <jgg@...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 v2 00/10] Add IO page table replacement support

On Thu, Feb 09, 2023 at 02:50:39AM +0000, Tian, Kevin wrote:
> External email: Use caution opening links or attachments
> 
> 
> > From: Nicolin Chen <nicolinc@...dia.com>
> > Sent: Wednesday, February 8, 2023 5:18 AM
> >
> > 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 still didn't see a clear reply why above is required. Please elaborate.

Hmm..this piece was directly copied from Jason's inputs before I
sent v1. And I thought he explained in the previous version. I
can drop it in v3 if that makes you happy.

Thanks
Nic