netdev - RE: [PATCH 15/17] iommu: remove DOMAIN_ATTR

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Message-ID: <MWHPR11MB188688125518D050E384658F8C629@MWHPR11MB1886.namprd11.prod.outlook.com>
Date:   Thu, 25 Mar 2021 06:12:37 +0000
From:   "Tian, Kevin" <kevin.tian@...el.com>
To:     Auger Eric <eric.auger@...hat.com>, Christoph Hellwig <hch@....de>
CC:     "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        Will Deacon <will@...nel.org>,
        "linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>,
        "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        Li Yang <leoyang.li@....com>,
        "iommu@...ts.linux-foundation.org" <iommu@...ts.linux-foundation.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        "virtualization@...ts.linux-foundation.org" 
        <virtualization@...ts.linux-foundation.org>,
        "freedreno@...ts.freedesktop.org" <freedreno@...ts.freedesktop.org>,
        "David Woodhouse" <dwmw2@...radead.org>,
        "linux-arm-msm@...r.kernel.org" <linux-arm-msm@...r.kernel.org>,
        "Liu, Yi L" <yi.l.liu@...el.com>
Subject: RE: [PATCH 15/17] iommu: remove DOMAIN_ATTR_NESTING

> From: Auger Eric
> Sent: Monday, March 15, 2021 3:52 PM
> To: Christoph Hellwig <hch@....de>
> Cc: kvm@...r.kernel.org; Will Deacon <will@...nel.org>; linuxppc-
> dev@...ts.ozlabs.org; dri-devel@...ts.freedesktop.org; Li Yang
> <leoyang.li@....com>; iommu@...ts.linux-foundation.org;
> 
> Hi Christoph,
> 
> On 3/14/21 4:58 PM, Christoph Hellwig wrote:
> > On Sun, Mar 14, 2021 at 11:44:52AM +0100, Auger Eric wrote:
> >> As mentionned by Robin, there are series planning to use
> >> DOMAIN_ATTR_NESTING to get info about the nested caps of the iommu
> (ARM
> >> and Intel):
> >>
> >> [Patch v8 00/10] vfio: expose virtual Shared Virtual Addressing to VMs
> >> patches 1, 2, 3
> >>
> >> Is the plan to introduce a new domain_get_nesting_info ops then?
> >
> > The plan as usual would be to add it the series adding that support.
> > Not sure what the merge plans are - if the series is ready to be
> > merged I could rebase on top of it, otherwise that series will need
> > to add the method.
> OK I think your series may be upstreamed first.
> 

Agree. The vSVA series is still undergoing a refactor according to Jason's
comment thus won't be ready in short term. It's better to let this one
go in first.

Thanks
Kevin