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Re: [PATCH] reserve end-of-conventional-memory to 1MB on 32-bit v2

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From: Ingo Molnar
Subject: Re: [PATCH] reserve end-of-conventional-memory to 1MB on 32-bit v2
Date: Tuesday, March 4, 2008 - 7:49 am

* Mark McLoughlin <markmc@redhat.com> wrote:


hm, for now i've only got the patch below queued up for v2.6.25.

Could you check whether just the patch below ontop of -rc3-ish upstream 
solves the problem too? The EBDA patch would be a bit risky now - it's 
queued up for v2.6.26 at the moment.

	Ingo

--------------->
Subject: x86/xen: fix DomU boot problem
From: Ian Campbell <ijc@hellion.org.uk>
Date: Thu, 28 Feb 2008 23:16:49 +0000

Construct Xen guest e820 map with a hole between 640K-1M.

It's pure luck that Xen kernels have gotten away with it in the past.

The patch below seems like the right thing to do. It certainly boots in
a domU without the DMI problem (without any of the other related patches
such as Alexander's).

Signed-off-by: Ian Campbell <ijc@hellion.org.uk>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Jeremy Fitzhardinge <jeremy@goop.org>
Tested-by: Mark McLoughlin <markmc@redhat.com>
Acked-by: Mark McLoughlin <markmc@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
---
 arch/x86/xen/setup.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

Index: linux-x86.q/arch/x86/xen/setup.c
===================================================================
--- linux-x86.q.orig/arch/x86/xen/setup.c
+++ linux-x86.q/arch/x86/xen/setup.c
@@ -38,7 +38,8 @@ char * __init xen_memory_setup(void)
 	unsigned long max_pfn = xen_start_info->nr_pages;
 
 	e820.nr_map = 0;
-	add_memory_region(0, PFN_PHYS(max_pfn), E820_RAM);
+	add_memory_region(0, LOWMEMSIZE(), E820_RAM);
+	add_memory_region(HIGH_MEMORY, PFN_PHYS(max_pfn)-HIGH_MEMORY, E820_RAM);
 
 	return "Xen";
 }
--
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Messages in current thread:
[PATCH] Fix alignment of early reservation for EBDA, Alexander van Heukelum, (Sun Feb 24, 10:46 am)
Re: [PATCH] Fix alignment of early reservation for EBDA, Andi Kleen, (Sun Feb 24, 12:27 pm)
Re: [PATCH] Fix alignment of early reservation for EBDA, Ingo Molnar, (Sun Feb 24, 12:41 pm)
Re: [PATCH] Fix alignment of early reservation for EBDA, Alexander van Heukelum, (Sun Feb 24, 1:53 pm)
Re: [PATCH] Fix alignment of early reservation for EBDA, H. Peter Anvin, (Sun Feb 24, 7:18 pm)
Re: [PATCH] Fix alignment of early reservation for EBDA, Alexander van Heukelum, (Mon Feb 25, 9:54 am)
Re: [PATCH] Fix alignment of early reservation for EBDA, Ingo Molnar, (Mon Feb 25, 10:01 am)
[PATCH] reserve_early end-of-conventional-memory to 1MB, Alexander van Heukelum, (Mon Feb 25, 11:07 am)
Re: [PATCH] reserve_early end-of-conventional-memory to 1MB, H. Peter Anvin, (Mon Feb 25, 11:13 am)
Re: [PATCH] reserve_early end-of-conventional-memory to 1MB, Alexander van Heukelum, (Mon Feb 25, 12:46 pm)
Re: [PATCH] reserve_early end-of-conventional-memory to 1MB, H. Peter Anvin, (Mon Feb 25, 2:17 pm)
Re: [PATCH] reserve_early end-of-conventional-memory to 1MB, Ingo Molnar, (Tue Feb 26, 2:30 am)
Re: [PATCH] Fix alignment of early reservation for EBDA, Andi Kleen, (Wed Feb 27, 7:25 am)
Re: [PATCH] reserve_early end-of-conventional-memory to 1MB, Andi Kleen, (Wed Feb 27, 7:26 am)
Re: [PATCH] reserve_early end-of-conventional-memory to 1M ..., Andi Kleen, (Wed Feb 27, 7:38 am)
Re: [PATCH] reserve_early end-of-conventional-memory to 1M ..., H. Peter Anvin, (Wed Feb 27, 9:44 am)
Re: [PATCH] reserve_early end-of-conventional-memory to 1M ..., Alexander van Heukelum, (Wed Feb 27, 1:01 pm)
[PATCH] reserve end-of-conventional-memory to 1MB on 32-bit, Alexander van Heukelum, (Thu Feb 28, 6:13 am)
[RFC] use realmode code to reserve end-of-conventional-mem ..., Alexander van Heukelum, (Thu Feb 28, 6:28 am)
Re: [PATCH] reserve end-of-conventional-memory to 1MB on 3 ..., Ian Campbell, (Thu Feb 28, 2:09 pm)
Re: [RFC] use realmode code to reserve end-of-conventional ..., Ian Campbell, (Thu Feb 28, 2:12 pm)
Re: [RFC] use realmode code to reserve end-of-conventional ..., H. Peter Anvin, (Thu Feb 28, 2:14 pm)
Re: [RFC] use realmode code to reserve end-of-conventional ..., Ian Campbell, (Thu Feb 28, 4:16 pm)
Re: [PATCH] reserve end-of-conventional-memory to 1MB on 3 ..., Alexander van Heukelum, (Fri Feb 29, 4:49 am)
Re: [PATCH] reserve end-of-conventional-memory to 1MB on 3 ..., Mark McLoughlin, (Fri Feb 29, 10:14 am)
Re: [PATCH] reserve end-of-conventional-memory to 1MB on 3 ..., Alexander van Heukelum, (Fri Feb 29, 11:38 am)
Re: [PATCH] reserve end-of-conventional-memory to 1MB on 3 ..., H. Peter Anvin, (Fri Feb 29, 11:44 am)
Re: [PATCH] reserve end-of-conventional-memory to 1MB on 3 ..., Alexander van Heukelum, (Fri Feb 29, 11:56 am)
Re: [RFC] use realmode code to reserve end-of-conventional ..., Ingo Molnar, (Fri Feb 29, 1:00 pm)
Re: [PATCH] reserve end-of-conventional-memory to 1MB on 3 ..., Mark McLoughlin, (Fri Feb 29, 3:06 pm)
Re: [PATCH] reserve end-of-conventional-memory to 1MB on 3 ..., Alexander van Heukelum, (Fri Feb 29, 3:26 pm)
Re: [PATCH] reserve end-of-conventional-memory to 1MB on 3 ..., Alexander van Heukelum, (Sat Mar 1, 9:09 am)
Re: [PATCH] reserve end-of-conventional-memory to 1MB on 6 ..., Alexander van Heukelum, (Sat Mar 1, 9:12 am)
Re: [RFC] use realmode code to reserve end-of-conventional ..., Mark McLoughlin, (Tue Mar 4, 4:41 am)
Re: [PATCH] reserve end-of-conventional-memory to 1MB on 3 ..., Mark McLoughlin, (Tue Mar 4, 4:44 am)
Re: [PATCH] reserve end-of-conventional-memory to 1MB on 3 ..., Alexander van Heukelum, (Tue Mar 4, 6:31 am)
Re: [RFC] use realmode code to reserve end-of-conventional ..., Ingo Molnar, (Tue Mar 4, 7:33 am)
Re: [PATCH] reserve end-of-conventional-memory to 1MB on 3 ..., Ingo Molnar, (Tue Mar 4, 7:49 am)
Re: [RFC] use realmode code to reserve end-of-conventional ..., Ian Campbell, (Tue Mar 4, 8:12 am)
Re: [RFC] use realmode code to reserve end-of-conventional ..., Jeremy Fitzhardinge, (Tue Mar 4, 8:13 am)
Re: [PATCH] reserve end-of-conventional-memory to 1MB on 3 ..., Mark McLoughlin, (Tue Mar 4, 8:16 am)
Re: [PATCH] reserve end-of-conventional-memory to 1MB on 3 ..., Jeremy Fitzhardinge, (Tue Mar 4, 8:18 am)
Re: [PATCH] reserve end-of-conventional-memory to 1MB on 3 ..., Ingo Molnar, (Tue Mar 4, 8:24 am)
Re: [RFC] use realmode code to reserve end-of-conventional ..., Ingo Molnar, (Tue Mar 4, 8:25 am)
Re: [RFC] use realmode code to reserve end-of-conventional ..., Jeremy Fitzhardinge, (Tue Mar 4, 9:02 am)
Re: [RFC] use realmode code to reserve end-of-conventional ..., Ingo Molnar, (Tue Mar 4, 9:15 am)
Re: [RFC] use realmode code to reserve end-of-conventional ..., Mark McLoughlin, (Tue Mar 4, 9:15 am)
Re: [RFC] use realmode code to reserve end-of-conventional ..., Ingo Molnar, (Tue Mar 4, 9:23 am)
Re: [PATCH] reserve end-of-conventional-memory to 1MB on 3 ..., Alexander van Heukelum, (Tue Mar 4, 9:51 am)
Re: [PATCH] reserve end-of-conventional-memory to 1MB on 3 ..., H. Peter Anvin, (Tue Mar 4, 10:05 am)
Re: [PATCH] reserve end-of-conventional-memory to 1MB on 3 ..., Jeremy Fitzhardinge, (Tue Mar 4, 10:11 am)
Re: [RFC] use realmode code to reserve end-of-conventional ..., Jeremy Fitzhardinge, (Tue Mar 4, 10:44 am)
Re: [PATCH] reserve end-of-conventional-memory to 1MB, 32- ..., Alexander van Heukelum, (Tue Mar 4, 11:57 am)
Re: [PATCH] reserve end-of-conventional-memory to 1MB, 64- ..., Alexander van Heukelum, (Tue Mar 4, 12:12 pm)
Re: [RFC] use realmode code to reserve end-of-conventional ..., Eduardo Habkost, (Wed Mar 5, 8:59 am)
Re: [RFC] use realmode code to reserve end-of-conventional ..., H. Peter Anvin, (Wed Mar 5, 9:08 am)
Re: [RFC] use realmode code to reserve end-of-conventional ..., Jeremy Fitzhardinge, (Wed Mar 5, 9:38 am)
Re: [RFC] use realmode code to reserve end-of-conventional ..., Eduardo Habkost, (Wed Mar 5, 9:53 am)
Re: [RFC] use realmode code to reserve end-of-conventional ..., H. Peter Anvin, (Wed Mar 5, 10:27 am)
Re: [RFC] use realmode code to reserve end-of-conventional ..., Jeremy Fitzhardinge, (Wed Mar 5, 10:28 am)
Re: [RFC] use realmode code to reserve end-of-conventional ..., H. Peter Anvin, (Wed Mar 5, 10:28 am)
Re: [RFC] use realmode code to reserve end-of-conventional ..., H. Peter Anvin, (Wed Mar 5, 10:38 am)