linux-kernel - Re: [RFC PATCH v3 8/8] vfio: Add nested IOPF support

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Message-ID: <8b6e5abd-d965-2331-7af3-08bef399af0f@huawei.com>
Date:   Tue, 1 Jun 2021 12:36:15 +0800
From:   Shenming Lu <lushenming@...wei.com>
To:     Lu Baolu <baolu.lu@...ux.intel.com>,
        Alex Williamson <alex.williamson@...hat.com>
CC:     Eric Auger <eric.auger@...hat.com>,
        Cornelia Huck <cohuck@...hat.com>,
        Will Deacon <will@...nel.org>,
        Robin Murphy <robin.murphy@....com>,
        "Joerg Roedel" <joro@...tes.org>,
        Jean-Philippe Brucker <jean-philippe@...aro.org>,
        <kvm@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <iommu@...ts.linux-foundation.org>, <linux-api@...r.kernel.org>,
        Kevin Tian <kevin.tian@...el.com>, <yi.l.liu@...el.com>,
        Christoph Hellwig <hch@...radead.org>,
        Jonathan Cameron <Jonathan.Cameron@...wei.com>,
        Barry Song <song.bao.hua@...ilicon.com>,
        <wanghaibin.wang@...wei.com>, <yuzenghui@...wei.com>
Subject: Re: [RFC PATCH v3 8/8] vfio: Add nested IOPF support

On 2021/5/27 19:18, Lu Baolu wrote:
> Hi Shenming and Alex,
> 
> On 5/27/21 7:03 PM, Shenming Lu wrote:
>>> I haven't fully read all the references, but who imposes the fact that
>>> there's only one fault handler per device?  If type1 could register one
>>> handler and the vfio-pci bus driver another for the other level, would
>>> we need this path through vfio-core?
>> If we could register more than one handler per device, things would become
>> much more simple, and the path through vfio-core would not be needed.
>>
>> Hi Baolu,
>> Is there any restriction for having more than one handler per device?
>>
> 
> Currently, each device could only have one fault handler. But one device
> might consume multiple page tables. From this point of view, it's more
> reasonable to have one handler per page table.

Sounds good to me. I have pointed it out in the IOASID uAPI proposal. :-)

Thanks,
Shenming

> 
> Best regards,
> baolu
> .