On Sun, Aug 30, 2009 at 01:42:14PM +0200, Christoph Lechner wrote:
> Gleb Natapov wrote:
> > This printk no longer exists in upstream kvm.
> >
>
> just to be curious: What was the reason to add that debugging message?
>
Because well behaved OS shouldn't read write only register. Unfortunately
older Linux kernels sometimes uses xchg to access eoi(b0) apic register
which will generate read/write.
> I don't know much about the background of the message, but I assume that
> it is useful. So wouldn't it be a idea to keep the code for the message
> where it is and just throttle the rate it is reported?
>
It's not too much useful unless you are debugging a guest.
--
Gleb.
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