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

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Message-ID: <ZAtY8S53//5P5egd@nvidia.com>
Date:   Fri, 10 Mar 2023 12:21:05 -0400
From:   Jason Gunthorpe <jgg@...dia.com>
To:     Shameerali Kolothum Thodi <shameerali.kolothum.thodi@...wei.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

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?

Jason