| From | Andi Kleen <> | Subject | [PATCH] [224/275] xen: set max_pfn_mapped to the last pfn mapped | Date | Wed, 30 Mar 2011 14:07:49 -0700 (PDT) |
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2.6.35-longterm review patch. If anyone has any objections, please let me know.
------------------ From: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
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 <stefano.stabellini@eu.citrix.com> Acked-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> Signed-off-by: Andi Kleen <ak@linux.intel.com> LKML-Reference: <alpine.DEB.2.00.1103171739050.3382@kaball-desktop> Signed-off-by: H. Peter Anvin <hpa@zytor.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
--- arch/x86/xen/mmu.c | 13 +++++++------ 1 file changed, 7 insertions(+), 6 deletions(-)
Index: linux-2.6.35.y/arch/x86/xen/mmu.c =================================================================== --- linux-2.6.35.y.orig/arch/x86/xen/mmu.c 2011-03-29 22:50:26.784573069 -0700 +++ linux-2.6.35.y/arch/x86/xen/mmu.c 2011-03-29 23:03:02.900225961 -0700 @@ -1641,9 +1641,6 @@ 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; @@ -1687,6 +1684,12 @@ 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); @@ -1750,9 +1753,7 @@ { 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);
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