Re: [Qemu-devel] [PATCH 00/13] IOMMU: Enable interrupt remapping for Intel IOMMU

[Jan Kiszka]

On 2016-02-19 12:34, Peter Xu wrote:
> On Fri, Feb 19, 2016 at 10:58:12AM +0100, Paolo Bonzini wrote:
>>
>> The source ID can be passed to the IOMMU using the MemTxAttrs mechanism.
> 
> I see that MemTxAttrs is not enabled yet? It's dropped in all the
> accessors like memory_region_write_accessor()?

That would be a pity. How much work remains to fix that? Putting Peter
Maydell on CC who apparently started this extension.

...
>> FWIW, Radim was thinking of interrupt remapping in the kvm-ioapic, which
>> we have decided to set aside.
> 
> Does it mean that we are planning not to support kernel_irqchip for
> IR? Any quick reason?

The reason to split up the kernel irqchip is to reduce code complexity
and, thus, attack surface of the kernel-side interface towards the
guest. So, extending the "classic" in-kernel support with yet another
feature is not really supporting that goal.

Jan

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