Re: kvm-88: KVM_APIC_READ: read reserved register b0

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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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