Re: [RFC][PATCH] KVM: Introduce direct MSI message injection for in-kernel irqchips

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On 10/24/2011 12:19 PM, Jan Kiszka wrote:
> > 
> > With the new feature it may be worthwhile, but I'd like to see the whole
> > thing, with numbers attached.
>
> It's not a performance issue, it's a resource limitation issue: With the
> new API we can stop worrying about user space device models consuming
> limited IRQ routes of the KVM subsystem.
>

Only if those devices are in the same process (or have access to the
vmfd).  Interrupt routing together with irqfd allows you to disaggregate
the device model.  Instead of providing a competing implementation with
new limitations, we need to remove the limitations of the old
implementation.

-- 
I have a truly marvellous patch that fixes the bug which this
signature is too narrow to contain.

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