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Re: [Qemu-devel] [PATCH RFC v4 18/20] intel_iommu: enable vfio devices

From: Jason Wang
Subject: Re: [Qemu-devel] [PATCH RFC v4 18/20] intel_iommu: enable vfio devices
Date: Mon, 23 Jan 2017 10:17:19 +0800
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.5.1

On 2017年01月23日 10:01, Jason Wang wrote:
On 2017年01月20日 21:08, Peter Xu wrote:
This patch is based on Aviv Ben-David (<address@hidden>)'s patch

   "IOMMU: enable intel_iommu map and unmap notifiers"

However I removed/fixed some content, and added my own codes.

Instead of translate() every page for iotlb invalidations (which is
slower), we walk the pages when needed and notify in a hook function.

This patch enables vfio devices for VT-d emulation.

Signed-off-by: Peter Xu<address@hidden>
hw/i386/intel_iommu.c | 66 +++++++++++++++++++++++++++++++++++++------
  include/hw/i386/intel_iommu.h |  8 ++++++
  2 files changed, 65 insertions(+), 9 deletions(-)

A good side effect of this patch is that it makes vhost device IOTLB works without ATS (though may be slow). We probably need a better title :)

Probably something like "remote IOMMU/IOTLB" support.


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