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SubjectRe: [linux-kernel] Re: [PATCH] x86: provide a DMI based port 0x80 I/O delay override.
Zachary Amsden wrote:
>
> BTW, it isn't ever safe to pass port 0x80 through to hardware from a
> virtual machine; some OSes use port 0x80 as a hardware available scratch
> register (I believe Darwin/x86 did/does this during boot).

That's funny, because there is definitely no guarantee that you get back
what you read (well, perhaps there is on Apple.)

-hpa


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