Re: [RFC] KVM: Balloon support for device assignment

[Avi Kivity <avi@redhat.com>]

On 02/17/2010 11:43 AM, borove@il.ibm.com wrote:
> From: Eran Borovik<borove@il.ibm.com>
>
> This patch adds modifications to allow correct
> balloon operation when a virtual guest uses a direct assigned device.
> The modifications include a new interface between qemu and kvm to allow
> mapping and unmapping the pages from the IOMMU as well as pinning and unpinning as needed.
>    

The plan for iommu support is to push it into uio.  Instead of kvm 
managing the iommu directly, I'd like qemu to open a uio device and set 
up an iommu mapping there, which will just happen to match the kvm 
memory slots.  Similarly, interrupts will be forwarded using irqfds.  
This will allow using the iommu without kvm, and reduce the amount of 
special purpose kvm code.

These patches make the transition more difficult which worries me.  I 
know Gerd looked at making the move, but no longer.

-- 
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