linux-kernel - Re: [PATCH 00/14] x86: disable virt on kdump and emergency

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Date:	Wed, 5 Nov 2008 13:04:55 -0200
From:	Eduardo Habkost <ehabkost@...hat.com>
To:	Vivek Goyal <vgoyal@...hat.com>
Cc:	Avi Kivity <avi@...hat.com>, Ingo Molnar <mingo@...e.hu>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Simon Horman <horms@...ge.net.au>,
	Andrew Morton <akpm@...l.org>, Haren Myneni <hbabu@...ibm.com>,
	Andrey Borzenkov <arvidjaar@...l.ru>, mingo@...hat.com,
	"Rafael J. Wysocki" <rjw@...k.pl>, kexec@...ts.infradead.org,
	kvm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 00/14] x86: disable virt on kdump and emergency_restart

On Wed, Nov 05, 2008 at 09:44:12AM -0500, Vivek Goyal wrote:
> On Tue, Nov 04, 2008 at 06:54:04PM +0200, Avi Kivity wrote:
> > Eduardo Habkost wrote:
> >> Hi,
> >>
> >> This is a new version of the series to disabling virtualization on kdump,
> >> now extended to do the same tricks on emergency_restart() if needed.
> >>   
> >
> > Looks good.  If you me to push it upstream, I'll need kexec/kdump acks.   
> > Otherwise, ack for the kvm bits.
> 
> Looks good to me from kdump perspective.
> 
> Is there a way we can prevent any other module from using virt disable
> callback incase kvm is not loaded?

I think we can't prevent other modules from using the API. But 3rd-party
modules deal with CPU virtualization extensions today won't live with
KVM today, anyway. And between not living together with KVM and breaking
kdump/reboot, and not living together with KVM and making kdump and
reboot working, I the the latter looks better.

But I see this as an orthogonal issue. If we include a "CPU virtualization
extensions core API" in the future, it could simply keep the same
emergency_virt_disable() API available for emergency_restart and kdump.

-- 
Eduardo
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