linux-kernel - Re: [Xen-devel] [PATCH][v9 4/6] xen/hvm: Xen PV extension of HVM initialization

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Message-ID: <1268760010.10129.31253.camel@zakaz.uk.xensource.com>
Date:	Tue, 16 Mar 2010 17:20:10 +0000
From:	Ian Campbell <Ian.Campbell@...rix.com>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
CC:	Sheng Yang <sheng@...ux.intel.com>,
	Stefano Stabellini <Stefano.Stabellini@...citrix.com>,
	xen-devel <xen-devel@...ts.xensource.com>,
	"Yaozu (Eddie) Dong" <eddie.dong@...el.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Ian Pratt <Ian.Pratt@...citrix.com>,
	Keir Fraser <Keir.Fraser@...citrix.com>
Subject: Re: [Xen-devel] [PATCH][v9 4/6] xen/hvm: Xen PV extension of HVM
 initialization

On Tue, 2010-03-16 at 17:12 +0000, Jeremy Fitzhardinge wrote:
> If we need a new vcpuop to make it work 
> properly anyway (set tsc offset), then the presence of that should be
> a 
> good indicator.  In other words, make it depend on its actual fixed 
> pre-reqs, rather than a specific flag for the feature. 

I don't think a new hypercall is required. Xen should simply pre-account
for the TSC offset which HVM guests are subject to in
__update_vcpu_system_time.

Ian.

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