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xen-devel
[Xen-devel] Re: [PATCH 00 of 36] x86/paravirt: groundwork for 64-bit Xen
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To: |
Ingo Molnar <mingo@xxxxxxx> |
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Subject: |
[Xen-devel] Re: [PATCH 00 of 36] x86/paravirt: groundwork for 64-bit Xen support |
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From: |
Jeremy Fitzhardinge <jeremy@xxxxxxxx> |
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Date: |
Thu, 26 Jun 2008 12:02:49 -0700 |
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Cc: |
Nick Piggin <npiggin@xxxxxxx>, Mark McLoughlin <markmc@xxxxxxxxxx>, xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxx>, Eduardo Habkost <ehabkost@xxxxxxxxxx>, Vegard Nossum <vegard.nossum@xxxxxxxxx>, Stephen Tweedie <sct@xxxxxxxxxx>, x86@xxxxxxxxxx, LKML <linux-kernel@xxxxxxxxxxxxxxx>, Yinghai Lu <yhlu.kernel@xxxxxxxxx> |
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Thu, 26 Jun 2008 12:03:30 -0700 |
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<patchbomb.1214367536@localhost> <20080625084253.GA11524@xxxxxxx> <20080625152212.GA3442@xxxxxxx> <4862A6A9.1030109@xxxxxxxx> <20080626105722.GA12640@xxxxxxx> |
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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@xxxxxxxxxx>
---
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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