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

From: Jason Wang <jasowang@redhat.com>
To: Peter Xu <peterx@redhat.com>, qemu-devel@nongnu.org
Cc: tianyu.lan@intel.com, kevin.tian@intel.com, mst@redhat.com,
	jan.kiszka@siemens.com, bd.aviv@gmail.com,
	alex.williamson@redhat.com
Subject: Re: [Qemu-devel] [PATCH RFC v4 18/20] intel_iommu: enable vfio devices
Date: Mon, 23 Jan 2017 10:17:19 +0800	[thread overview]
Message-ID: <eb485cba-55f3-62e9-67c9-7040be15b72e@redhat.com> (raw)
In-Reply-To: <b3b2f711-c120-ec0e-689e-68bdeaa05392@redhat.com>

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 (<bd.aviv@gmail.com>)'s patch
>> upstream:
>>
>>    "IOMMU: enable intel_iommu map and unmap notifiers"
>> https://lists.gnu.org/archive/html/qemu-devel/2016-11/msg01453.html
>>
>> 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<peterx@redhat.com>
>> ---
>>   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.

Thanks