Re: [PATCH] expose kvmclock upper msr set.

From: Avi Kivity
Date: Mon Feb 28 2011 - 08:30:38 EST

On 02/28/2011 03:30 PM, Avi Kivity wrote:
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.

btw, it should work with -cpu host as well, no?

error compiling committee.c: too many arguments to function

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