Re: [RFC PATCH 0/4] ARM: KVM: Enable the ioeventfd capability of KVM on ARM

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On 31 March 2014 16:49, Alexander Graf <agraf@xxxxxxx> wrote:
> On 03/31/2014 03:53 PM, Peter Maydell wrote:
>> On 31 March 2014 14:44, Alexander Graf <agraf@xxxxxxx> wrote:
>>> IRQ Routing is really just a map from a flat number space that KVM uses
>>> internally to specific interrupt controller pins. So if you see a "GSI"
>>> that
>>> really just means "global interrupt index number".
>>
>> Er, but we already have a global interrupt index number
>> for ARM, it's the value you pass to KVM_IRQ_LINE. What
>> extra does IRQ routing bring to the party?

> It allows you to have multiple distributors :). And MSI target IDs that you
> can use for irqfd.

What's a distributor in this context? Why would an MSI
target ID need to be any different from the ID format
we're currently using?

thanks
-- PMM
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