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Re: [Qemu-devel] [PATCH v11 10/22] vfio iommu type1: Add support for med
Re: [Qemu-devel] [PATCH v11 10/22] vfio iommu type1: Add support for mediated devices
Tue, 8 Nov 2016 17:52:47 +1100
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On 05/11/16 08:10, Kirti Wankhede wrote:
> VFIO IOMMU drivers are designed for the devices which are IOMMU capable.
> Mediated device only uses IOMMU APIs, the underlying hardware can be
> managed by an IOMMU domain.
> Aim of this change is:
> - To use most of the code of TYPE1 IOMMU driver for mediated devices
> - To support direct assigned device and mediated device in single module
> This change adds pin and unpin support for mediated device to TYPE1 IOMMU
> backend module. More details:
> - vfio_pin_pages() callback here uses task and address space of vfio_dma,
> that is, of the process who mapped that iova range.
> - Added pfn_list tracking logic to address space structure. All pages
> pinned through this interface are trached in its address space.
> - Pinned pages list is used to verify unpinning request and to unpin
> remaining pages while detaching the group for that device.
> - Page accounting is updated to account in its address space where the
> pages are pinned/unpinned.
> - Accouting for mdev device is only done if there is no iommu capable
> domain in the container. When there is a direct device assigned to the
> container and that domain is iommu capable, all pages are already pinned
> during DMA_MAP.
> - Page accouting is updated on hot plug and unplug mdev device and pass
> through device.
> Tested by assigning below combinations of devices to a single VM:
> - GPU pass through only
This does not require this patchset, right?
> - vGPU device only
Out of curiosity - how exactly did you test this? The exact GPU, how to
create vGPU, what was the QEMU command line and the guest does with this
passed device? Thanks.
[Qemu-devel] [PATCH v11 10/22] vfio iommu type1: Add support for mediated devices, Kirti Wankhede, 2016/11/04
Re: [Qemu-devel] [PATCH v11 10/22] vfio iommu type1: Add support for mediated devices,
Alexey Kardashevskiy <=
Re: [Qemu-devel] [PATCH v11 10/22] vfio iommu type1: Add support for mediated devices, Dong Jia Shi, 2016/11/13
[Qemu-devel] [PATCH v11 11/22] vfio iommu: Add blocking notifier to notify DMA_UNMAP, Kirti Wankhede, 2016/11/04