This is a note to let you know that I've just added the patch titled
xen: set max_pfn_mapped to the last pfn mapped
to the 2.6.32-longterm tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/longterm/longterm-queue-2.6.32.git;a=summary
The filename of the patch is:
xen-set-max_pfn_mapped-to-the-last-pfn-mapped.patch
and it can be found in the queue-2.6.32 subdirectory.
If you, or anyone else, feels it should not be added to the 2.6.32 longterm
tree,
please let <[email protected]> know about it.
>From 14988a4d350ce3b41ecad4f63c4f44c56f5ae34d Mon Sep 17 00:00:00 2001
From: Stefano Stabellini <[email protected]>
Date: Fri, 18 Feb 2011 11:32:40 +0000
Subject: xen: set max_pfn_mapped to the last pfn mapped
From: Stefano Stabellini <[email protected]>
commit 14988a4d350ce3b41ecad4f63c4f44c56f5ae34d upstream.
Do not set max_pfn_mapped to the end of the initial memory mappings,
that also contain pages that don't belong in pfn space (like the mfn
list).
Set max_pfn_mapped to the last real pfn mapped in the initial memory
mappings that is the pfn backing _end.
Signed-off-by: Stefano Stabellini <[email protected]>
Acked-by: Konrad Rzeszutek Wilk <[email protected]>
LKML-Reference: <alpine.DEB.2.00.1103171739050.3382@kaball-desktop>
Signed-off-by: H. Peter Anvin <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
arch/x86/xen/mmu.c | 13 +++++++------
1 file changed, 7 insertions(+), 6 deletions(-)
--- a/arch/x86/xen/mmu.c
+++ b/arch/x86/xen/mmu.c
@@ -1658,9 +1658,6 @@ static __init void xen_map_identity_earl
for (pteidx = 0; pteidx < PTRS_PER_PTE; pteidx++, pfn++) {
pte_t pte;
- if (pfn > max_pfn_mapped)
- max_pfn_mapped = pfn;
-
if (!pte_none(pte_page[pteidx]))
continue;
@@ -1704,6 +1701,12 @@ __init pgd_t *xen_setup_kernel_pagetable
pud_t *l3;
pmd_t *l2;
+ /* max_pfn_mapped is the last pfn mapped in the initial memory
+ * mappings. Considering that on Xen after the kernel mappings we
+ * have the mappings of some pages that don't exist in pfn space, we
+ * set max_pfn_mapped to the last real pfn mapped. */
+ max_pfn_mapped = PFN_DOWN(__pa(xen_start_info->mfn_list));
+
/* Zap identity mapping */
init_level4_pgt[0] = __pgd(0);
@@ -1767,9 +1770,7 @@ __init pgd_t *xen_setup_kernel_pagetable
{
pmd_t *kernel_pmd;
- max_pfn_mapped = PFN_DOWN(__pa(xen_start_info->pt_base) +
- xen_start_info->nr_pt_frames * PAGE_SIZE +
- 512*1024);
+ max_pfn_mapped = PFN_DOWN(__pa(xen_start_info->mfn_list));
kernel_pmd = m2v(pgd[KERNEL_PGD_BOUNDARY].pgd);
memcpy(level2_kernel_pgt, kernel_pmd, sizeof(pmd_t) * PTRS_PER_PMD);
Patches currently in longterm-queue-2.6.32 which might be from
[email protected] are
/home/gregkh/linux/longterm/longterm-queue-2.6.32/queue-2.6.32/pci-hotplug-acpiphp-set-current_state-to-d0-in-register_slot.patch
/home/gregkh/linux/longterm/longterm-queue-2.6.32/queue-2.6.32/x86-cleanup-highmap-after-brk-is-concluded.patch
/home/gregkh/linux/longterm/longterm-queue-2.6.32/queue-2.6.32/xen-set-max_pfn_mapped-to-the-last-pfn-mapped.patch
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