linux-kernel - Re: [PATCH] expose kvmclock upper msr set.

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Message-ID: <4D6BA35E.6060504@redhat.com>
Date:	Mon, 28 Feb 2011 15:30:06 +0200
From:	Avi Kivity <avi@...hat.com>
To:	Glauber Costa <glommer@...hat.com>
CC:	kvm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] expose kvmclock upper msr set.

On 02/28/2011 03:24 PM, Glauber Costa wrote:
> On Sun, 2011-02-27 at 14:16 +0200, Avi Kivity wrote:
> >  On 02/23/2011 07:44 PM, Glauber Costa wrote:
> >  >  We've been supporting kvmclock MSRs in the 0x4b564d00-0x4b564dff range
> >  >  for a while now, but we're not exposing it yet, meaning nobody is using it.
> >  >  This simple patch takes care of that.
> >
> >  We're exposing them via KVM_GET_SUPPORTED_CPUID, leaf KVM_CPUID_FEATURES.
> >
> Our userspace does not really use it, and rely on the capability list.
> Historically, we've been relying on the capabilities mechanism to
> indicate what exists and what does not.

Yes.  I believe this bit marked the change point.

Anyway, it's exposed, and it's a lot better for userspace to make use of 
KVM_GET_SUPPORTED_CPUID since it will work on more kernels.

-- 
error compiling committee.c: too many arguments to function

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