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Re: [Xen-devel] Re: [PATCH][v4] PV extension of HVM(hybrid) support in X

from [Jeremy Fitzhardinge] [Permanent Link][Original]
To: Sheng Yang <sheng@xxxxxxxxxxxxxxx>
Subject: Re: [Xen-devel] Re: [PATCH][v4] PV extension of HVM(hybrid) support in Xen
From: Jeremy Fitzhardinge <jeremy@xxxxxxxx>
Date: Mon, 01 Mar 2010 17:49:55 -0800
Cc: Ian Campbell <Ian.Campbell@xxxxxxxxxxxxx>, Ian Pratt <Ian.Pratt@xxxxxxxxxxxxx>, xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxx>, Tim Deegan <Tim.Deegan@xxxxxxxxxx>, Keir Fraser <Keir.Fraser@xxxxxxxxxxxxx>
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On 03/01/2010 03:40 AM, Sheng Yang wrote:

The issue is pv timer. It assumed the tsc start from 0, which is different
from HVM. So I'd like to give it a explicit call here. Otherwise it can be
hooked in evtchn binding, but I don't think that's clear...


[...]

Only vcpu 0?  Doesn't this do horrible things to timekeeping in the guest?

The other vcpus are initialized when it is brought up. TSC started from 0 is a
fundamental assumption for pv clock in Linux...
Could you expand on this? Do you mean in the pvops Xen time code? What do you mean? 

    J

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