Re: [Android-virt] [PATCH v3 1/8] ARM: KVM: Initial skeleton to compile KVM support

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On 05.06.2011, at 18:33, Avi Kivity wrote:

> On 06/05/2011 07:30 PM, Alexander Graf wrote:
>> >>
>> >>  Could you elaborate what you mean here? I'm not really following. Are
>> >>  you suggesting a new arch-generic interface? (Pardon my ignorance).
>> >
>> >  Using KVM_IRQ_LINE everywhere except s390, not just in x86 and ARM.
>> 
>> An in-kernel MPIC implementation is coming for PPC, so I don't see any reason to switch from something that works now.
> 
> Right, this is spilled milk.
> 
> Does the ppc qemu implementation raise KVM_INTERRUPT solely from the vcpu thread?

Well, without iothread it used to obviously. Now that we have an iothread, it calls ioctl(KVM_INTERRUPT) from a separate thread. The code also doesn't forcefully wake up the vcpu thread, so yes, I think here's a chance for at least delaying interrupt delivery. Chances are pretty slim we don't get out of the vcpu thread at all :).


Alex

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