linux-kernel - Re: [Xen-devel] [PATCH v11 11/12] xen/pvh: Disable PV code that does not work with PVH.

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Date:	Wed, 18 Dec 2013 09:56:02 -0500
From:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
To:	Stefano Stabellini <stefano.stabellini@...citrix.com>
Cc:	xen-devel@...ts.xenproject.org, linux-kernel@...r.kernel.org,
	boris.ostrovsky@...cle.com, david.vrabel@...rix.com,
	mukesh.rathor@...cle.com, jbeulich@...e.com
Subject: Re: [Xen-devel] [PATCH v11 11/12] xen/pvh: Disable PV code that does
 not work with PVH.

On Wed, Dec 18, 2013 at 02:19:28PM +0000, Stefano Stabellini wrote:
> On Tue, 17 Dec 2013, Konrad Rzeszutek Wilk wrote:
> > From: Mukesh Rathor <mukesh.rathor@...cle.com>
> > 
> > As we do not have yet a mechanism for that.
> > 
> > Signed-off-by: Mukesh Rathor <mukesh.rathor@...cle.com>
> > Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
> 
> Even though we don't even compile cpu_hotplug on ARM yet, I don't like
> this change because it affects ARM guests too.

Perhaps then just #ifdef it with CONFIG_X86 for right now?

> 
> Please add a note about ARM guests in the FIXME line.

Good idea. Is the offline/online part working in ARM? Or is that it
has not been tested?
> 
> 
> >  drivers/xen/cpu_hotplug.c | 4 +++-
> >  1 file changed, 3 insertions(+), 1 deletion(-)
> > 
> > diff --git a/drivers/xen/cpu_hotplug.c b/drivers/xen/cpu_hotplug.c
> > index cc6513a..cbb02af 100644
> > --- a/drivers/xen/cpu_hotplug.c
> > +++ b/drivers/xen/cpu_hotplug.c
> > @@ -4,6 +4,7 @@
> >  
> >  #include <xen/xen.h>
> >  #include <xen/xenbus.h>
> > +#include <xen/features.h>
> >  
> >  #include <asm/xen/hypervisor.h>
> >  #include <asm/cpu.h>
> > @@ -102,7 +103,8 @@ static int __init setup_vcpu_hotplug_event(void)
> >  	static struct notifier_block xsn_cpu = {
> >  		.notifier_call = setup_cpu_watcher };
> >  
> > -	if (!xen_pv_domain())
> > +	/* PVH TBD/FIXME: future work */
> > +	if (!xen_pv_domain() || xen_feature(XENFEAT_auto_translated_physmap))
> >  		return -ENODEV;
> >  
> >  	register_xenstore_notifier(&xsn_cpu);
> 
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