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Re: [Qemu-devel] [PATCH v2 2/3] intel-iommu: extend VTD emulation to all
From: |
Peter Xu |
Subject: |
Re: [Qemu-devel] [PATCH v2 2/3] intel-iommu: extend VTD emulation to allow 57-bit IOVA address width. |
Date: |
Wed, 14 Nov 2018 14:36:40 +0800 |
User-agent: |
Mutt/1.10.1 (2018-07-13) |
On Wed, Nov 14, 2018 at 02:04:43PM +0800, Yu Zhang wrote:
> A 5-level paging capable VM may choose to use 57-bit IOVA address width.
> E.g. guest applications may prefer to use its VA as IOVA when performing
> VFIO map/unmap operations, to avoid the burden of managing the IOVA space.
>
> This patch extends the current vIOMMU logic to cover the extended address
> width. When creating a VM with 5-level paging feature, one can choose to
> create a virtual VTD with 5-level paging capability, with configurations
> like "-device intel-iommu,x-aw-bits=57".
>
> Signed-off-by: Yu Zhang <address@hidden>
Reviewed-by: Peter Xu <address@hidden>
--
Peter Xu