Re: [PATCH] decouple x2apic from irq remapping

[Ingo Molnar]

* Gleb Natapov <gleb@xxxxxxxxxx> wrote:

> Hi,
> 
> Currently x2apic is used only if interrupt remapping can be enabled,
> but if all apic ids are smaller then 255 there is no reason to
> enable interrupt remapping at all. Although there is not real HW that has
> x2apic but does not have IR the decoupling is useful since we want to
> emulate x2apic interface in KVM (it is more vitalization friendly), but
> we don't want to emulate IR just for that.
> 
> According to Intel docs BIOS should pass control to OS in x2apic mode 
> if there are apics with id > 255 and in xapic otherwise, so the proposed
> patch requires IR configuration only if BIOS switched apic to x2apic
> mode.
> 
> The patch is against tip:x86/apic.

Applied to tip:x86/apic, thanks Gleb!

	Ingo
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