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

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Date:	Wed, 9 Mar 2011 14:01:25 +0000
From:	Stefano Stabellini <stefano.stabellini@...citrix.com>
To:	Daniel Kiper <dkiper@...-space.pl>
CC:	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 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
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