linux-kernel - Re: [Xen-devel] [PATCH v11 09/12] xen/pvh: Piggyback on PVHVM XenBus and event channels for PVH.

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Message-ID: <alpine.DEB.2.02.1401031501180.8667@kaball.uk.xensource.com>
Date:	Fri, 3 Jan 2014 15:04:27 +0000
From:	Stefano Stabellini <stefano.stabellini@...citrix.com>
To:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
CC:	Stefano Stabellini <stefano.stabellini@...citrix.com>,
	<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 09/12] xen/pvh: Piggyback on PVHVM XenBus
 and event channels for PVH.

On Tue, 31 Dec 2013, Konrad Rzeszutek Wilk wrote:
> > > --- a/drivers/xen/xenbus/xenbus_client.c
> > > +++ b/drivers/xen/xenbus/xenbus_client.c
> > > @@ -45,6 +45,7 @@
> > >  #include <xen/grant_table.h>
> > >  #include <xen/xenbus.h>
> > >  #include <xen/xen.h>
> > > +#include <xen/features.h>
> > >  
> > >  #include "xenbus_probe.h"
> > >  
> > > @@ -743,7 +744,7 @@ static const struct xenbus_ring_ops ring_ops_hvm = {
> > >  
> > >  void __init xenbus_ring_ops_init(void)
> > >  {
> > > -	if (xen_pv_domain())
> > > +	if (xen_pv_domain() && !xen_feature(XENFEAT_auto_translated_physmap))
> > 
> > Can we just change this test to
> > 
> > if (!xen_feature(XENFEAT_auto_translated_physmap))
> > 
> > ?
> 
> No. If we do then the HVM domains (which are also !auto-xlat)
> will end up using the PV version of ring_ops.

Actually HVM guests have XENFEAT_auto_translated_physmap, so in this
case they would get &ring_ops_hvm.


> > >  		ring_ops = &ring_ops_pv;
> > >  	else
> > >  		ring_ops = &ring_ops_hvm;
> > > -- 
> > > 1.8.3.1
> > > 
> > > 
> > > _______________________________________________
> > > Xen-devel mailing list
> > > Xen-devel@...ts.xen.org
> > > http://lists.xen.org/xen-devel
> > > 
> 
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