linux-kernel - Re: [PATCH R4 0/7] xen/balloon: Memory hotplug support for Xen balloon driver

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Message-ID: <20110315142957.GB12730@router-fw-old.local.net-space.pl>
Date:	Tue, 15 Mar 2011 15:29:57 +0100
From:	Daniel Kiper <dkiper@...-space.pl>
To:	Stefano Stabellini <stefano.stabellini@...citrix.com>
Cc:	Daniel Kiper <dkiper@...-space.pl>,
	Ian Campbell <Ian.Campbell@...citrix.com>,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	"andi.kleen@...el.com" <andi.kleen@...el.com>,
	"haicheng.li@...ux.intel.com" <haicheng.li@...ux.intel.com>,
	"fengguang.wu@...el.com" <fengguang.wu@...el.com>,
	"jeremy@...p.org" <jeremy@...p.org>,
	"konrad.wilk@...cle.com" <konrad.wilk@...cle.com>,
	Dan Magenheimer <dan.magenheimer@...cle.com>,
	"v.tolstov@...fip.ru" <v.tolstov@...fip.ru>,
	"pasik@....fi" <pasik@....fi>,
	"dave@...ux.vnet.ibm.com" <dave@...ux.vnet.ibm.com>,
	"wdauchy@...il.com" <wdauchy@...il.com>,
	"rientjes@...gle.com" <rientjes@...gle.com>,
	"xen-devel@...ts.xensource.com" <xen-devel@...ts.xensource.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>
Subject: Re: [PATCH R4 0/7] xen/balloon: Memory hotplug support for Xen balloon driver

On Wed, Mar 09, 2011 at 02:01:25PM +0000, Stefano Stabellini wrote:
> On Tue, 8 Mar 2011, Daniel Kiper wrote:
> > Hi,
> >
> > I am sending next version of memory hotplug
> > support for Xen balloon driver patch. It applies
> > to Linus' git tree, v2.6.38-rc8 tag. Most of
> > suggestions were taken into account. Thanks for
> > everybody who tested and/or sent suggestions
> > to my work.
> >
> > There are a few prerequisite patches which fixes
> > some problems found during work on memory hotplug
> > patch or add some futures which are needed by
> > memory hotplug patch.
> >
> > Full list of fixes/futures:
> >   - xen/balloon: Removal of driver_pages,
> >   - xen/balloon: HVM mode support,
> >   - xen/balloon: Migration from mod_timer() to schedule_delayed_work(),
> >   - xen/balloon: Protect against CPU exhaust by event/x process,
> >   - xen/balloon: Minor notation fixes,
> >   - mm: Extend memory hotplug API to allow memory hotplug in virtual guests,
> >   - xen/balloon: Memory hotplug support for Xen balloon driver.
> >
> > Additionally, I suggest to apply patch prepared by Steffano Stabellini
> > (https://lkml.org/lkml/2011/1/31/232) which fixes memory management
> > issue in Xen guest. I was not able boot guest machine without
> > above mentioned patch.
>
> after some discussions we came up with a different approach to fix the
> issue; I sent a couple of patches a little while ago:
>
> https://lkml.org/lkml/2011/2/28/410

I tested git://xenbits.xen.org/people/sstabellini/linux-pvhvm.git 2.6.38-tip-fixes
and it works on x86_64, however, it does not work on i386. Tested as
unprivileged guest on Xen Ver. 4.1.0-rc2-pre. On i386 domain crashes
silently at early boot stage :-(((.

Daniel
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