Re: [Xen-devel] [PATCH 0/4] x86/hpet: various adjustments

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 27.03.12 at 17:39, Keir Fraser <keir@xxxxxxx> wrote:
> On 27/03/2012 14:27, "Jan Beulich" <JBeulich@xxxxxxxx> wrote:
> 
>>>> 1: disable before reboot or kexec
>>>> 2: replace disabling of legacy broadcast
>>>> 3: clear unwanted bits
>>>> 4: use asm/hpet.h in HVM emulation code
>>>> 
>>>> Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
>>> 
>>> Whole series is
>>> Acked-by: Keir Fraser <keir@xxxxxxx>
>> 
>> Thanks, committed. However - any thoughts on how to deal with
>> unknown bits set in the configuration registers? (I also just sent
>> the same question to the Linux guys.)
> 
> Not really. Warn on them and zero them?

Thomas Gleixner wants Linux to just warn - retaining the bits and
clearing them is imo equally dangerous, so I'd be fine with clearing
them in Xen to find out (at some point in the distant future, if ever)
which approach is marginally better.

Jan


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