This is a note to let you know that I've just added the patch titled
x86/xen: correct bug in p2m list initialization
to the 3.19-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:
x86-xen-correct-bug-in-p2m-list-initialization.patch
and it can be found in the queue-3.19 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From b8f05c8803fce899d79ca66f8d7f348cf15fb40e Mon Sep 17 00:00:00 2001
From: Juergen Gross <jgross@xxxxxxxx>
Date: Fri, 27 Feb 2015 15:45:29 +0100
Subject: x86/xen: correct bug in p2m list initialization
From: Juergen Gross <jgross@xxxxxxxx>
commit b8f05c8803fce899d79ca66f8d7f348cf15fb40e upstream.
Commit 054954eb051f35e74b75a566a96fe756015352c8 ("xen: switch to
linear virtual mapped sparse p2m list") introduced an error.
During initialization of the p2m list a p2m identity area mapped by
a complete identity pmd entry has to be split up into smaller chunks
sometimes, if a non-identity pfn is introduced in this area.
If this non-identity pfn is not at index 0 of a p2m page the new
p2m page needed is initialized with wrong identity entries, as the
identity pfns don't start with the value corresponding to index 0,
but with the initial non-identity pfn. This results in weird wrong
mappings.
Correct the wrong initialization by starting with the correct pfn.
Reported-by: Stefan Bader <stefan.bader@xxxxxxxxxxxxx>
Signed-off-by: Juergen Gross <jgross@xxxxxxxx>
Tested-by: Stefan Bader <stefan.bader@xxxxxxxxxxxxx>
Signed-off-by: David Vrabel <david.vrabel@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
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
@@ -567,7 +567,7 @@ static bool alloc_p2m(unsigned long pfn)
if (p2m_pfn == PFN_DOWN(__pa(p2m_missing)))
p2m_init(p2m);
else
- p2m_init_identity(p2m, pfn);
+ p2m_init_identity(p2m, pfn & ~(P2M_PER_PAGE - 1));
spin_lock_irqsave(&p2m_update_lock, flags);
Patches currently in stable-queue which might be from jgross@xxxxxxxx are
queue-3.19/x86-xen-correct-bug-in-p2m-list-initialization.patch
queue-3.19/xen-events-avoid-null-pointer-dereference-in-dom0-on-large-machines.patch
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