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authorStefano Stabellini <stefano.stabellini@eu.citrix.com>2011-02-18 11:32:40 +0000
committerH. Peter Anvin <hpa@zytor.com>2011-03-19 11:58:25 -0700
commit14988a4d350ce3b41ecad4f63c4f44c56f5ae34d (patch)
tree25ee7d584ab8f4d707dfdf484928195f8c655b28 /arch
parente5f15b45ddf3afa2bbbb10c7ea34fb32b6de0a0e (diff)
downloadop-kernel-dev-14988a4d350ce3b41ecad4f63c4f44c56f5ae34d.zip
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xen: set max_pfn_mapped to the last pfn mapped
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> LKML-Reference: <alpine.DEB.2.00.1103171739050.3382@kaball-desktop> Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Diffstat (limited to 'arch')
-rw-r--r--arch/x86/xen/mmu.c13
1 files changed, 7 insertions, 6 deletions
diff --git a/arch/x86/xen/mmu.c b/arch/x86/xen/mmu.c
index a2d78ad..6e27979 100644
--- a/arch/x86/xen/mmu.c
+++ b/arch/x86/xen/mmu.c
@@ -1701,9 +1701,6 @@ static __init void xen_map_identity_early(pmd_t *pmd, unsigned long max_pfn)
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;
@@ -1761,6 +1758,12 @@ __init pgd_t *xen_setup_kernel_pagetable(pgd_t *pgd,
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);
@@ -1865,9 +1868,7 @@ __init pgd_t *xen_setup_kernel_pagetable(pgd_t *pgd,
initial_kernel_pmd =
extend_brk(sizeof(pmd_t) * PTRS_PER_PMD, PAGE_SIZE);
- 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(initial_kernel_pmd, kernel_pmd, sizeof(pmd_t) * PTRS_PER_PMD);
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