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RE: [Xen-devel] HPET in HVM guests

from [Jan Beulich] [Permanent Link][Original]
To: "Dan Magenheimer" <dan.magenheimer@xxxxxxxxxx>
Subject: RE: [Xen-devel] HPET in HVM guests
From: "Jan Beulich" <JBeulich@xxxxxxxxxx>
Date: Mon, 21 Dec 2009 09:43:26 +0000
Cc: xen-devel@xxxxxxxxxxxxxxxxxxx, Keir Fraser <keir.fraser@xxxxxxxxxxxxx>
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>>> 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.

Jan


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