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Message-ID: <4863E7D9.7090307@goop.org>
Date: Thu, 26 Jun 2008 12:02:49 -0700
From: Jeremy Fitzhardinge <jeremy@...p.org>
To: Ingo Molnar <mingo@...e.hu>
CC: LKML <linux-kernel@...r.kernel.org>, x86@...nel.org,
xen-devel <xen-devel@...ts.xensource.com>,
Stephen Tweedie <sct@...hat.com>,
Eduardo Habkost <ehabkost@...hat.com>,
Mark McLoughlin <markmc@...hat.com>,
Vegard Nossum <vegard.nossum@...il.com>,
Nick Piggin <npiggin@...e.de>,
Yinghai Lu <yhlu.kernel@...il.com>
Subject: Re: [PATCH 00 of 36] x86/paravirt: groundwork for 64-bit Xen support
Ingo Molnar wrote:
> that fixed the build but now we've got a boot crash with this config:
>
> time.c: Detected 2010.304 MHz processor.
> spurious 8259A interrupt: IRQ7.
> BUG: unable to handle kernel NULL pointer dereference at 0000000000000000
> IP: [<0000000000000000>]
> PGD 0
> Thread overran stack, or stack corrupted
> Oops: 0010 [1] SMP
> CPU 0
>
I don't know if this will fix this bug, but it's definitely a bugfix.
It was trashing random pages by overwriting them with pagetables...
Subject: x86_64: memory mapping: don't trash large pmd mapping
Don't trash a large pmd's data when mapping physical memory.
This is a bugfix for "x86_64: adjust mapping of physical pagetables
to work with Xen".
Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>
---
arch/x86/mm/init_64.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
===================================================================
--- a/arch/x86/mm/init_64.c
+++ b/arch/x86/mm/init_64.c
@@ -311,7 +311,8 @@
}
if (pmd_val(*pmd)) {
- phys_pte_update(pmd, address, end);
+ if (!pmd_large(*pmd))
+ phys_pte_update(pmd, address, end);
continue;
}
--
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