linux-kernel - Re: [Xen-devel] [PATCH] arch/x86/xen/setup: Fix for incorrect xen_extra_mem_start initialization ifdef CONFIG_X86

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Message-ID: <20110516074654.GA6393@router-fw-old.local.net-space.pl>
Date:	Mon, 16 May 2011 09:46:54 +0200
From:	Daniel Kiper <dkiper@...-space.pl>
To:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
Cc:	Daniel Kiper <dkiper@...-space.pl>,
	stefano.stabellini@...citrix.com, linux-kernel@...r.kernel.org,
	xen-devel@...ts.xensource.com
Subject: Re: [Xen-devel] [PATCH] arch/x86/xen/setup: Fix for incorrect xen_extra_mem_start initialization ifdef CONFIG_X86_32

On Thu, May 12, 2011 at 02:58:08PM -0400, Konrad Rzeszutek Wilk wrote:
> On Wed, May 11, 2011 at 10:34:38PM +0200, Daniel Kiper wrote:
> > git commit 24bdb0b62cc82120924762ae6bc85afc8c3f2b26 (xen: do not create
> > the extra e820 region at an addr lower than 4G) does not take into
> > account that ifdef CONFIG_X86_32 instead of e820_end_of_low_ram_pfn()
> > find_low_pfn_range() is called (both calls are from arch/x86/kernel/setup.c).
> > find_low_pfn_range() behaves correctly and does not require change in
> > xen_extra_mem_start initialization. Additionally, if xen_extra_mem_start
> > is initialized in the same way as ifdef CONFIG_X86_64 then memory hotplug
> > support for Xen balloon driver (under development) is broken.
>
> in linux-next.

Thanks. Additionally, I would like to mention that git commit 279b706bf800b5967037f492dbe4fc5081ad5d0f
(x86,xen: introduce x86_init.mapping.pagetable_reserve) which fixes bug introduced by
git commit 4b239f458c229de044d6905c2b0f9fe16ed9e01e (x86-64, mm: Put early page table
high) works on my machine.

Daniel
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