Messages in this thread Patch in this message | | | Date | Fri, 08 Jul 2011 15:49:52 -0700 | From | Greg KH <> | Subject | [03/35] xen: partially revert "xen: set max_pfn_mapped to the last pfn mapped" |
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2.6.32-longterm review patch. If anyone has any objections, please let us know.
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From: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
commit a91d92875ee94e4703fd017ccaadb48cfb344994 upstream.
We only need to set max_pfn_mapped to the last pfn mapped on x86_64 to make sure that cleanup_highmap doesn't remove important mappings at _end.
We don't need to do this on x86_32 because cleanup_highmap is not called on x86_32. Besides lowering max_pfn_mapped on x86_32 has the unwanted side effect of limiting the amount of memory available for the 1:1 kernel pagetable allocation.
This patch reverts the x86_32 part of the original patch.
Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
--- arch/x86/xen/mmu.c | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-)
--- a/arch/x86/xen/mmu.c +++ b/arch/x86/xen/mmu.c @@ -1658,6 +1658,11 @@ static __init void xen_map_identity_earl for (pteidx = 0; pteidx < PTRS_PER_PTE; pteidx++, pfn++) { pte_t pte; +#ifdef CONFIG_X86_32 + if (pfn > max_pfn_mapped) + max_pfn_mapped = pfn; +#endif + if (!pte_none(pte_page[pteidx])) continue; @@ -1770,7 +1775,9 @@ __init pgd_t *xen_setup_kernel_pagetable { pmd_t *kernel_pmd; - max_pfn_mapped = PFN_DOWN(__pa(xen_start_info->mfn_list)); + max_pfn_mapped = PFN_DOWN(__pa(xen_start_info->pt_base) + + xen_start_info->nr_pt_frames * PAGE_SIZE + + 512*1024); kernel_pmd = m2v(pgd[KERNEL_PGD_BOUNDARY].pgd); memcpy(level2_kernel_pgt, kernel_pmd, sizeof(pmd_t) * PTRS_PER_PMD);
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