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Re: [Xen-devel] xen 4 only seeing one keyboard and mouse

On Mon, Aug 23, 2010 at 09:37:31PM +0100, M A Young wrote:
> On Mon, 23 Aug 2010, M A Young wrote:
> >>We could hack it and make sure that in
> >>setup_IO_APIC_irqs for IRQ 12, we make it send to both CPUs.
> >>Something like this (compile tested only):
> >
> >I don't get any output from that modification!
> Which might be a 4.0.0 issue not in 4.0.1-rc6 or I might have messed
> up the test, because I do get the "hack" line segment with 4.0.1-rc6

What did the hack line say? Was the value 1, 2, something completly

> though the mouse and keyboard still don't work.

I spoke with Keir a bit and he mentioned that there was a major
rework of the IRQs in 4.0, wherein we would store the IRQs per CPU
structure. That is instead of having a "globally" accessible irq structure
wherein CPUs might contend for it. The folks at Intel did this so they might
have a better idea - and I can dig up from the hg annotate logs who they
are and we can ask them. But before we go that route, the other idea was
try to disable the irq balance code. Try passing in 'noirqbalance' and see what 

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