Re: [Qemu-devel] [RFC v1 7/7] vhost: abort if an emulated iommu is used

[Avi Kivity]

On 10/11/2012 03:31 PM, Michael S. Tsirkin wrote:
> On Thu, Oct 11, 2012 at 03:27:03PM +0200, Avi Kivity wrote:
>> vhost doesn't support guest iommus yet, indicate it to the user
>> by gently depositing a core on their disk.
>> 
>> Signed-off-by: Avi Kivity <address@hidden>
> 
> Actually there is no problem. virtio bypasses an IOMMU,
> so vhost works fine by writing into guest memory directly.
> 
> So I don't think we need this patch.

The pci subsystem should set up the iommu so that it ignores virtio
devices.  If it does, an emulated iommu will not reach vhost.  If it
doesn't, then it will, and the assert() will alert us that we have a bug.


-- 
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