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Re: [Xen-devel] RE: question about hvm vhpet

To: "Tian, Kevin" <kevin.tian@xxxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>
Subject: Re: [Xen-devel] RE: question about hvm vhpet
From: Keir Fraser <keir.fraser@xxxxxxxxxxxxx>
Date: Fri, 21 Nov 2008 09:02:53 +0000
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On 21/11/08 08:10, "Tian, Kevin" <kevin.tian@xxxxxxxxx> wrote:

>> Then if config file for hvm domain has no explicit 'hpet=0/1' option,
>> will xend issue a hypercall to set vhpet to '0' or the latter will be
>> left as '1'?
>> 
> 
> It's the former. Anyway, let's keep code aligned with original
> purpose.

The hypervisor code is as it is for old saved guests which do not explicitly
specify HPET. They will have been booted with HPET unconditionally enabled,
and it must not disappear under their feet if they are restored on a newer
hypervisor!

 -- Keir



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