x86/paravirt: groundwork for 64-bit Xen support, fix #2
authorJeremy Fitzhardinge <jeremy@goop.org>
Thu, 26 Jun 2008 19:02:49 +0000 (12:02 -0700)
committerIngo Molnar <mingo@elte.hu>
Tue, 8 Jul 2008 11:16:02 +0000 (13:16 +0200)
commit22b45144f67dbaf0705992dc1462de2813fb83a1
tree6894ead3ec10e0d9ae7828237283419508fe3840
parent457da70ec09ca78e8fda5d5ab3659248f844a376
x86/paravirt: groundwork for 64-bit Xen support, fix #2

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...

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@citrix.com>
Cc: xen-devel <xen-devel@lists.xensource.com>
Cc: Stephen Tweedie <sct@redhat.com>
Cc: Eduardo Habkost <ehabkost@redhat.com>
Cc: Mark McLoughlin <markmc@redhat.com>
Cc: Vegard Nossum <vegard.nossum@gmail.com>
Cc: Nick Piggin <npiggin@suse.de>
Cc: Yinghai Lu <yhlu.kernel@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
arch/x86/mm/init_64.c