linux-kernel - Re: [PATCH 1/2] KVM: VMX: Notify if VMX is already in use

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Message-ID: <1323267891.4009.16.camel@lappy>
Date:	Wed, 07 Dec 2011 16:24:51 +0200
From:	Sasha Levin <levinsasha928@...il.com>
To:	Avi Kivity <avi@...hat.com>
Cc:	linux-kernel@...r.kernel.org, Joerg Roedel <joerg.roedel@....com>,
	Marcelo Tosatti <mtosatti@...hat.com>, kvm@...r.kernel.org
Subject: Re: [PATCH 1/2] KVM: VMX: Notify if VMX is already in use

On Wed, 2011-12-07 at 16:23 +0200, Avi Kivity wrote:
> On 12/07/2011 04:18 PM, Sasha Levin wrote:
> > On Wed, 2011-12-07 at 16:17 +0200, Avi Kivity wrote:
> > > On 12/01/2011 08:30 PM, Sasha Levin wrote:
> > > > Currently we silently fail if VMX is already in use by a different
> > > > virtualization technology.
> > > >
> > > > This is bad since it's non-obvious for the user, and its not too uncommon
> > > > for users to have several of these installed on same host.
> > > >
> > > > This patch adds a message to notify the user of the problem.
> > > >
> > > 
> > > Does this actually happen?  With which hypervisor?
> >
> > vbox
> >
> > It turns VMX/SVM on when it loads, regardless of whether it's running a
> > guest or not.
> 
> That's odd.  IIRC when we discussed this with them, they were executing
> VMXON/VMXOFF dynamically.  Looks like they changed this.
> 
> Anyway, please adjust according to Joerg's comment (and add the word
> "using"), and I'll apply.

I've seen it the day before I've sent those patches. vbox driver loaded,
kvm silently failed and rdmsr showed SVME turned on.

Will resend.

-- 

Sasha.

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