This is a note to let you know that I've just added the patch titled
xen/p2m: Fix one-off error in checking the P2M tree directory.
to the 3.5-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
xen-p2m-fix-one-off-error-in-checking-the-p2m-tree-directory.patch
and it can be found in the queue-3.5 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <[email protected]> know about it.
>From 50e900417b8096939d12a46848f965e27a905e36 Mon Sep 17 00:00:00 2001
From: Konrad Rzeszutek Wilk <[email protected]>
Date: Tue, 4 Sep 2012 15:45:17 -0400
Subject: xen/p2m: Fix one-off error in checking the P2M tree directory.
From: Konrad Rzeszutek Wilk <[email protected]>
commit 50e900417b8096939d12a46848f965e27a905e36 upstream.
We would traverse the full P2M top directory (from 0->MAX_DOMAIN_PAGES
inclusive) when trying to figure out whether we can re-use some of the
P2M middle leafs.
Which meant that if the kernel was compiled with MAX_DOMAIN_PAGES=512
we would try to use the 512th entry. Fortunately for us the p2m_top_index
has a check for this:
BUG_ON(pfn >= MAX_P2M_PFN);
which we hit and saw this:
(XEN) domain_crash_sync called from entry.S
(XEN) Domain 0 (vcpu#0) crashed on cpu#0:
(XEN) ----[ Xen-4.1.2-OVM x86_64 debug=n Tainted: C ]----
(XEN) CPU: 0
(XEN) RIP: e033:[<ffffffff819cadeb>]
(XEN) RFLAGS: 0000000000000212 EM: 1 CONTEXT: pv guest
(XEN) rax: ffffffff81db5000 rbx: ffffffff81db4000 rcx: 0000000000000000
(XEN) rdx: 0000000000480211 rsi: 0000000000000000 rdi: ffffffff81db4000
(XEN) rbp: ffffffff81793db8 rsp: ffffffff81793d38 r8: 0000000008000000
(XEN) r9: 4000000000000000 r10: 0000000000000000 r11: ffffffff81db7000
(XEN) r12: 0000000000000ff8 r13: ffffffff81df1ff8 r14: ffffffff81db6000
(XEN) r15: 0000000000000ff8 cr0: 000000008005003b cr4: 00000000000026f0
(XEN) cr3: 0000000661795000 cr2: 0000000000000000
Fixes-Oracle-Bug: 14570662
Signed-off-by: Konrad Rzeszutek Wilk <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
arch/x86/xen/p2m.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/arch/x86/xen/p2m.c
+++ b/arch/x86/xen/p2m.c
@@ -599,7 +599,7 @@ bool __init early_can_reuse_p2m_middle(u
if (p2m_index(set_pfn))
return false;
- for (pfn = 0; pfn <= MAX_DOMAIN_PAGES; pfn += P2M_PER_PAGE) {
+ for (pfn = 0; pfn < MAX_DOMAIN_PAGES; pfn += P2M_PER_PAGE) {
topidx = p2m_top_index(pfn);
if (!p2m_top[topidx])
Patches currently in stable-queue which might be from [email protected] are
queue-3.5/xen-p2m-reuse-existing-p2m-leafs-if-they-are-filled-with-1-1-pfns-or-invalid.patch
queue-3.5/xen-p2m-fix-one-off-error-in-checking-the-p2m-tree-directory.patch
queue-3.5/xen-use-correct-masking-in-xen_swiotlb_alloc_coherent.patch
queue-3.5/xen-pciback-fix-proper-flr-steps.patch
queue-3.5/xen-setup-fix-one-off-error-when-adding-for-balloon-pfns-to-the-p2m.patch
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