RE: [PATCH v1 01/14] iommu: Add iommu_get_unmanaged_domain helper

Shameerali Kolothum Thodi
2023-03-10T16:31:11Z

> -----Original Message-----
> From: Jason Gunthorpe [mailto:jgg@nvidia.com]
> Sent: 10 March 2023 16:21
> To: Shameerali Kolothum Thodi <shameerali.kolothum.thodi@huawei.com>
> Cc: Eric Auger <eric.auger@redhat.com>; Nicolin Chen
> <nicolinc@nvidia.com>; robin.murphy@arm.com; will@kernel.org;
> kevin.tian@intel.com; baolu.lu@linux.intel.com; joro@8bytes.org;
> jean-philippe@linaro.org; linux-arm-kernel@lists.infradead.org;
> iommu@lists.linux.dev; linux-kernel@vger.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@huawei.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