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RE: [Xen-devel] HPET in HVM guests

To: Jan Beulich <JBeulich@xxxxxxxxxx>
Subject: RE: [Xen-devel] HPET in HVM guests
From: Dan Magenheimer <dan.magenheimer@xxxxxxxxxx>
Date: Mon, 21 Dec 2009 07:51:14 -0800 (PST)
Cc: xen-devel@xxxxxxxxxxxxxxxxxxx, Keir Fraser <keir.fraser@xxxxxxxxxxxxx>
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> From: Jan Beulich [mailto:JBeulich@xxxxxxxxxx]
> Sent: Monday, December 21, 2009 2:43 AM
> To: Dan Magenheimer
> Cc: Keir Fraser; xen-devel@xxxxxxxxxxxxxxxxxxx
> Subject: RE: [Xen-devel] HPET in HVM guests
> >>> Dan Magenheimer <dan.magenheimer@xxxxxxxxxx> 18.12.09 18:55 >>>
> >Are you suggesting that an HVM use of HPET should be
> >plumbed through to the hardware HPET?  Hardware HPET
> >access is verrrrryyyyyy slow and save/restore/migration
> >would likely be a problem.
> No, I'm just talking about what you appear to call vHPET.
> >And in any case, what do you expect to gain by using
> >HPET instead of another clocksource?
> Certain Windows certification seem the require the presence (and
> visibility through ACPI tables) of HPET.

Do the WHQL rules allow for turning on a parameter
in the VM config file?  If so, setting hpet=1 should
work (though I haven't tested it in quite awhile so
bitrot might have set in).


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