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

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Message-ID: <799e9f32-8102-649c-bb79-c8582d070f96@redhat.com>
Date:   Wed, 22 Mar 2023 16:44:17 +0100
From:   Eric Auger <eric.auger@...hat.com>
To:     Shameerali Kolothum Thodi <shameerali.kolothum.thodi@...wei.com>,
        Nicolin Chen <nicolinc@...dia.com>,
        "lpieralisi@...nel.org" <lpieralisi@...nel.org>
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,

On 3/16/23 20:56, Shameerali Kolothum Thodi wrote:
>
>> -----Original Message-----
>> From: Nicolin Chen [mailto:nicolinc@...dia.com]
>> Sent: 16 March 2023 19:51
>> To: Shameerali Kolothum Thodi <shameerali.kolothum.thodi@...wei.com>;
>> Eric Auger <eric.auger@...hat.com>
>> Cc: Jason Gunthorpe <jgg@...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
>>
>> 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-shame
>>>> er
>>>>>>> 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-65290
>>> 78da97d@...hat.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?
> [+Lorenzo]

I am not aware of any change in the situation.

Thanks

Eric
>
> Not sure it is fixed yet. Also, assuming we take RMR path, do we plan to support 
> DT base Guests at all?
>
> Thanks,
> Shameer
>