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From: Jean-Philippe Brucker <jean-philippe@linaro.org>
To: Eric Auger <eric.auger@redhat.com>
Cc: eric.auger.pro@gmail.com, iommu@lists.linux-foundation.org,
	linux-kernel@vger.kernel.org, kvm@vger.kernel.org,
	kvmarm@lists.cs.columbia.edu, will@kernel.org, maz@kernel.org,
	robin.murphy@arm.com, joro@8bytes.org,
	alex.williamson@redhat.com, tn@semihalf.com,
	zhukeqian1@huawei.com, jacob.jun.pan@linux.intel.com,
	yi.l.liu@intel.com, wangxingang5@huawei.com,
	jiangkunkun@huawei.com, zhangfei.gao@linaro.org,
	zhangfei.gao@gmail.com, vivek.gautam@arm.com,
	shameerali.kolothum.thodi@huawei.com, yuzenghui@huawei.com,
	nicoleotsuka@gmail.com, lushenming@huawei.com, vsethi@nvidia.com
Subject: Re: [PATCH v12 03/13] vfio: VFIO_IOMMU_SET_MSI_BINDING
Date: Fri, 5 Mar 2021 11:45:50 +0100	[thread overview]
Message-ID: <YEIL3qmcRfhUoRGt@myrica> (raw)
In-Reply-To: <20210223210625.604517-4-eric.auger@redhat.com>

Hi,

On Tue, Feb 23, 2021 at 10:06:15PM +0100, Eric Auger wrote:
> This patch adds the VFIO_IOMMU_SET_MSI_BINDING ioctl which aim
> to (un)register the guest MSI binding to the host. This latter
> then can use those stage 1 bindings to build a nested stage
> binding targeting the physical MSIs.

Now that RMR is in the IORT spec, could it be used for the nested MSI
problem?  For virtio-iommu tables I was planning to do it like this:

MSI is mapped at stage-2 with an arbitrary IPA->doorbell PA. We report
this IPA to userspace through iommu_groups/X/reserved_regions. No change
there. Then to the guest we report a reserved identity mapping at IPA
(using RMR, an equivalent DT binding, or probed RESV_MEM for
virtio-iommu). The guest creates that mapping at stage-1, and that's it.
Unless I overlooked something we'd only reuse existing infrastructure and
avoid the SET_MSI_BINDING interface.

Thanks,
Jean

  parent reply	other threads:[~2021-03-05 10:47 UTC|newest]

Thread overview: 23+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-02-23 21:06 [PATCH v12 00/13] SMMUv3 Nested Stage Setup (VFIO part) Eric Auger
2021-02-23 21:06 ` [PATCH v12 01/13] vfio: VFIO_IOMMU_SET_PASID_TABLE Eric Auger
2021-02-24  0:21   ` kernel test robot
2021-02-24  1:19   ` kernel test robot
2021-02-24  3:29   ` kernel test robot
2021-04-07  9:33   ` Zenghui Yu
2021-04-11 12:12     ` Auger Eric
2021-02-23 21:06 ` [PATCH v12 02/13] vfio: VFIO_IOMMU_CACHE_INVALIDATE Eric Auger
2021-02-23 21:06 ` [PATCH v12 03/13] vfio: VFIO_IOMMU_SET_MSI_BINDING Eric Auger
2021-02-24  2:22   ` kernel test robot
2021-03-05 10:45   ` Jean-Philippe Brucker [this message]
2021-03-08 18:12     ` Auger Eric
2021-02-23 21:06 ` [PATCH v12 04/13] vfio/pci: Add VFIO_REGION_TYPE_NESTED region type Eric Auger
2021-02-23 21:06 ` [PATCH v12 05/13] vfio/pci: Register an iommu fault handler Eric Auger
2021-02-23 21:06 ` [PATCH v12 06/13] vfio/pci: Allow to mmap the fault queue Eric Auger
2021-02-23 21:06 ` [PATCH v12 07/13] vfio: Use capability chains to handle device specific irq Eric Auger
2021-02-23 21:06 ` [PATCH v12 08/13] vfio/pci: Add framework for custom interrupt indices Eric Auger
2021-02-23 21:06 ` [PATCH v12 09/13] vfio: Add new IRQ for DMA fault reporting Eric Auger
2021-02-23 21:06 ` [PATCH v12 10/13] vfio/pci: Register and allow DMA FAULT IRQ signaling Eric Auger
2021-02-23 21:06 ` [PATCH v12 11/13] vfio: Document nested stage control Eric Auger
2021-02-23 21:06 ` [PATCH v12 12/13] vfio/pci: Register a DMA fault response region Eric Auger
2021-02-23 21:06 ` [PATCH v12 13/13] vfio/pci: Inject page response upon response region fill Eric Auger
2021-03-18  0:00 ` [PATCH v12 00/13] SMMUv3 Nested Stage Setup (VFIO part) Krishna Reddy

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