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

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Date:   Fri, 10 Mar 2023 16:30:03 +0000
From:   Shameerali Kolothum Thodi <shameerali.kolothum.thodi@...wei.com>
To:     Jason Gunthorpe <jgg@...dia.com>
CC:     Eric Auger <eric.auger@...hat.com>,
        Nicolin Chen <nicolinc@...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



> -----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/

Thanks,
Shameer