linux-kernel - Re: [PATCH v1 01/14] iommu: Add iommu_get_unmanaged

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Date:   Thu, 16 Mar 2023 12:51:18 -0700
From:   Nicolin Chen <nicolinc@...dia.com>
To:     Shameerali Kolothum Thodi <shameerali.kolothum.thodi@...wei.com>,
        "Eric Auger" <eric.auger@...hat.com>
CC:     Jason Gunthorpe <jgg@...dia.com>,
        "robin.murphy@....com" <robin.murphy@....com>,
        "will@...nel.org" <will@...nel.org>,
        "kevin.tian@...el.com" <kevin.tian@...el.com>,
        "baolu.lu@...ux.intel.com" <baolu.lu@...ux.intel.com>,
        "joro@...tes.org" <joro@...tes.org>,
        "jean-philippe@...aro.org" <jean-philippe@...aro.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "iommu@...ts.linux.dev" <iommu@...ts.linux.dev>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v1 01/14] iommu: Add iommu_get_unmanaged_domain helper

Hi Shameer/Eric,

On Fri, Mar 10, 2023 at 04:30:03PM +0000, Shameerali Kolothum Thodi wrote:
> External email: Use caution opening links or attachments
> 
> 
> > -----Original Message-----
> > From: Jason Gunthorpe [mailto:jgg@...dia.com]
> > Sent: 10 March 2023 16:21
> > To: Shameerali Kolothum Thodi <shameerali.kolothum.thodi@...wei.com>
> > Cc: Eric Auger <eric.auger@...hat.com>; Nicolin Chen
> > <nicolinc@...dia.com>; robin.murphy@....com; will@...nel.org;
> > kevin.tian@...el.com; baolu.lu@...ux.intel.com; joro@...tes.org;
> > jean-philippe@...aro.org; linux-arm-kernel@...ts.infradead.org;
> > iommu@...ts.linux.dev; linux-kernel@...r.kernel.org
> > Subject: Re: [PATCH v1 01/14] iommu: Add iommu_get_unmanaged_domain
> > helper
> >
> > On Fri, Mar 10, 2023 at 04:07:38PM +0000, Shameerali Kolothum Thodi
> > wrote:
> > > >
> > https://lore.kernel.org/linux-arm-kernel/20220420164836.1181-5-shameer
> > > > > ali.kolothum.thodi@...wei.com/
> > > >
> > > > So "boot configration" is more like "don't change the RIDs"? Ie don't
> > enable
> > > > SRIOV?
> > >
> > > Yes. Don't think it will work with SR-IOV if you can't guarantee the RMR
> > specified
> > > SID.
> >
> > So I think we are probably good them because vSR-IOV is already not
> > supported by qemu, so it impossible for a VM to change the PCI
> > configuration in a way that would alter the RID to SID mapping?
> >
> 
> Provided we fix the issue mentioned by Eric. This was discussed here previously,
> 
> https://lore.kernel.org/linux-arm-kernel/bb3688c7-8f42-039e-e22f-6529078da97d@redhat.com/

Have we fixed the issue? I saw Lorenzo replying in that thread:
https://lore.kernel.org/linux-arm-kernel/Yi8nV8H4Jjlpadmk@lpieralisi/

Or, what's remaining here regarding this topic? Is it a blocker?

Thanks
Nic