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xen-devel
[Xen-devel] [tip:x86/urgent] x86: xen, i386: reserve Xen pagetables
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[Xen-devel] [tip:x86/urgent] x86: xen, i386: reserve Xen pagetables |
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tip-bot for Jeremy Fitzhardinge <jeremy@xxxxxxxx> |
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Date: |
Fri, 8 May 2009 09:07:14 GMT |
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xen-devel@xxxxxxxxxxxxxxxxxxx, jeremy@xxxxxxxx, jeremy.fitzhardinge@xxxxxxxxxx, bdonlan@xxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, mingo@xxxxxxxxxx, hpa@xxxxxxxxx, tglx@xxxxxxxxxxxxx, torvalds@xxxxxxxxxxxxxxxxxxxx, mingo@xxxxxxx |
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33df4db04a79660150e1948e3296eeb451ac121b |
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Commit-ID: 33df4db04a79660150e1948e3296eeb451ac121b
Gitweb: http://git.kernel.org/tip/33df4db04a79660150e1948e3296eeb451ac121b
Author: Jeremy Fitzhardinge <jeremy@xxxxxxxx>
AuthorDate: Thu, 7 May 2009 11:56:44 -0700
Committer: Ingo Molnar <mingo@xxxxxxx>
CommitDate: Fri, 8 May 2009 10:49:11 +0200
x86: xen, i386: reserve Xen pagetables
The Xen pagetables are no longer implicitly reserved as part of the other
i386_start_kernel reservations, so make sure we explicitly reserve them.
This prevents them from being released into the general kernel free page
pool and reused.
[ Impact: fix Xen guest crash ]
Also-Bisected-by: Bryan Donlan <bdonlan@xxxxxxxxx>
Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@xxxxxxxxxx>
Cc: Xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxx>
Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
LKML-Reference: <4A032EEC.30509@xxxxxxxx>
Signed-off-by: Ingo Molnar <mingo@xxxxxxx>
---
arch/x86/xen/mmu.c | 5 +++++
1 files changed, 5 insertions(+), 0 deletions(-)
diff --git a/arch/x86/xen/mmu.c b/arch/x86/xen/mmu.c
index 9842b12..e25a78e 100644
--- a/arch/x86/xen/mmu.c
+++ b/arch/x86/xen/mmu.c
@@ -1794,6 +1794,11 @@ __init pgd_t *xen_setup_kernel_pagetable(pgd_t *pgd,
pin_pagetable_pfn(MMUEXT_PIN_L3_TABLE, PFN_DOWN(__pa(swapper_pg_dir)));
+ reserve_early(__pa(xen_start_info->pt_base),
+ __pa(xen_start_info->pt_base +
+ xen_start_info->nr_pt_frames * PAGE_SIZE),
+ "XEN PAGETABLES");
+
return swapper_pg_dir;
}
#endif /* CONFIG_X86_64 */
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