This is a note to let you know that I've just added the patch titled
xen/p2m: Allow alloc_p2m_middle to call reserve_brk depending on argument
to the 3.4-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-allow-alloc_p2m_middle-to-call-reserve_brk-depending-on-argument.patch
and it can be found in the queue-3.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From cef4cca551d652b7f69c9d76337c5fae24e069dc Mon Sep 17 00:00:00 2001
From: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
Date: Fri, 30 Mar 2012 14:15:14 -0400
Subject: xen/p2m: Allow alloc_p2m_middle to call reserve_brk depending on argument
From: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
commit cef4cca551d652b7f69c9d76337c5fae24e069dc upstream.
For identity cases we want to call reserve_brk only on the boundary
conditions of the middle P2M (so P2M[x][y][0] = extend_brk). This is
to work around identify regions (PCI spaces, gaps in E820) which are not
aligned on 2MB regions.
However for the case were we want to allocate P2M middle leafs at the
early bootup stage, irregardless of this alignment check we need some
means of doing that. For that we provide the new argument.
Signed-off-by: Daniel Kiper <daniel.kiper@xxxxxxxxxx>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/x86/xen/p2m.c | 10 +++++-----
1 file changed, 5 insertions(+), 5 deletions(-)
--- a/arch/x86/xen/p2m.c
+++ b/arch/x86/xen/p2m.c
@@ -499,7 +499,7 @@ static bool alloc_p2m(unsigned long pfn)
return true;
}
-static bool __init early_alloc_p2m_middle(unsigned long pfn)
+static bool __init early_alloc_p2m_middle(unsigned long pfn, bool check_boundary)
{
unsigned topidx, mididx, idx;
@@ -508,7 +508,7 @@ static bool __init early_alloc_p2m_middl
idx = p2m_index(pfn);
/* Pfff.. No boundary cross-over, lets get out. */
- if (!idx)
+ if (!idx && check_boundary)
return false;
WARN(p2m_top[topidx][mididx] == p2m_identity,
@@ -531,7 +531,7 @@ static bool __init early_alloc_p2m_middl
p2m_top[topidx][mididx] = p2m;
/* For save/restore we need to MFN of the P2M saved */
-
+
mid_mfn_p = p2m_top_mfn_p[topidx];
WARN(mid_mfn_p[mididx] != virt_to_mfn(p2m_missing),
"P2M_TOP_P[%d][%d] != MFN of p2m_missing!\n",
@@ -592,8 +592,8 @@ unsigned long __init set_phys_range_iden
WARN_ON(!early_alloc_p2m(pfn));
}
- early_alloc_p2m_middle(pfn_s);
- early_alloc_p2m_middle(pfn_e);
+ early_alloc_p2m_middle(pfn_s, true);
+ early_alloc_p2m_middle(pfn_e, true);
for (pfn = pfn_s; pfn < pfn_e; pfn++)
if (!__set_phys_to_machine(pfn, IDENTITY_FRAME(pfn)))
Patches currently in stable-queue which might be from konrad.wilk@xxxxxxxxxx are
queue-3.4/xen-p2m-move-code-around-to-allow-for-better-re-usage.patch
queue-3.4/xen-p2m-collapse-early_alloc_p2m_middle-redundant-checks.patch
queue-3.4/xen-p2m-allow-alloc_p2m_middle-to-call-reserve_brk-depending-on-argument.patch
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