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From: Shenming Lu <lushenming@huawei.com>
To: Lu Baolu <baolu.lu@linux.intel.com>,
	Alex Williamson <alex.williamson@redhat.com>
Cc: Eric Auger <eric.auger@redhat.com>,
	Cornelia Huck <cohuck@redhat.com>, Will Deacon <will@kernel.org>,
	Robin Murphy <robin.murphy@arm.com>,
	"Joerg Roedel" <joro@8bytes.org>,
	Jean-Philippe Brucker <jean-philippe@linaro.org>,
	<kvm@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
	<linux-arm-kernel@lists.infradead.org>,
	<iommu@lists.linux-foundation.org>, <linux-api@vger.kernel.org>,
	Kevin Tian <kevin.tian@intel.com>, <yi.l.liu@intel.com>,
	Christoph Hellwig <hch@infradead.org>,
	Jonathan Cameron <Jonathan.Cameron@huawei.com>,
	Barry Song <song.bao.hua@hisilicon.com>,
	<wanghaibin.wang@huawei.com>, <yuzenghui@huawei.com>
Subject: Re: [RFC PATCH v3 8/8] vfio: Add nested IOPF support
Date: Tue, 1 Jun 2021 12:36:15 +0800	[thread overview]
Message-ID: <8b6e5abd-d965-2331-7af3-08bef399af0f@huawei.com> (raw)
In-Reply-To: <9daf8877-a538-2d19-f548-b00ea6f127df@linux.intel.com>

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
> .

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  reply	other threads:[~2021-06-01  4:38 UTC|newest]

Thread overview: 40+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-04-09  3:44 [RFC PATCH v3 0/8] Add IOPF support for VFIO passthrough Shenming Lu
2021-04-09  3:44 ` [RFC PATCH v3 1/8] iommu: Evolve the device fault reporting framework Shenming Lu
2021-05-18 18:58   ` Alex Williamson
2021-05-21  6:37     ` Shenming Lu
2021-04-09  3:44 ` [RFC PATCH v3 2/8] vfio/type1: Add a page fault handler Shenming Lu
2021-05-18 18:58   ` Alex Williamson
2021-05-21  6:38     ` Shenming Lu
2021-05-24 22:11       ` Alex Williamson
2021-05-27 11:16         ` Shenming Lu
2021-04-09  3:44 ` [RFC PATCH v3 3/8] vfio/type1: Add an MMU notifier to avoid pinning Shenming Lu
2021-05-18 18:58   ` Alex Williamson
2021-05-21  6:37     ` Shenming Lu
2021-04-09  3:44 ` [RFC PATCH v3 4/8] vfio/type1: Pre-map more pages than requested in the IOPF handling Shenming Lu
2021-05-18 18:58   ` Alex Williamson
2021-05-21  6:37     ` Shenming Lu
2021-04-09  3:44 ` [RFC PATCH v3 5/8] vfio/type1: VFIO_IOMMU_ENABLE_IOPF Shenming Lu
2021-05-18 18:58   ` Alex Williamson
2021-05-21  6:38     ` Shenming Lu
2021-05-24 22:11       ` Alex Williamson
2021-05-27 11:15         ` Shenming Lu
2021-04-09  3:44 ` [RFC PATCH v3 6/8] vfio/type1: No need to statically pin and map if IOPF enabled Shenming Lu
2021-05-18 18:58   ` Alex Williamson
2021-05-21  6:39     ` Shenming Lu
2021-04-09  3:44 ` [RFC PATCH v3 7/8] vfio/type1: Add selective DMA faulting support Shenming Lu
2021-05-18 18:58   ` Alex Williamson
2021-05-21  6:39     ` Shenming Lu
2021-04-09  3:44 ` [RFC PATCH v3 8/8] vfio: Add nested IOPF support Shenming Lu
2021-05-18 18:58   ` Alex Williamson
2021-05-21  7:59     ` Shenming Lu
2021-05-24 13:11       ` Shenming Lu
2021-05-24 22:11         ` Alex Williamson
2021-05-27 11:03           ` Shenming Lu
2021-05-27 11:18             ` Lu Baolu
2021-06-01  4:36               ` Shenming Lu [this message]
2021-04-26  1:41 ` [RFC PATCH v3 0/8] Add IOPF support for VFIO passthrough Shenming Lu
2021-05-11 11:30   ` Shenming Lu
2021-05-18 18:57 ` Alex Williamson
2021-05-21  6:37   ` Shenming Lu
2021-05-24 22:11     ` Alex Williamson
2021-05-27 11:25       ` Shenming Lu

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