[Xen-changelog] [xen-unstable] LINUX/x86_64: Ensure that the initial page tables allow userspace

[Xen patchbot-unstable <patchbot-unstable@xxxxxxxxxxxxxxxxxxx>]

# HG changeset patch
# User Ian Campbell <ian.campbell@xxxxxxxxxxxxx>
# Date 1179994483 -3600
# Node ID a40967e39652fee1edebfddec4b533bdded923a1
# Parent  f6928d6369999cd063edd361d592579c2483196b
LINUX/x86_64: Ensure that the initial page tables allow userspace
mappings of the vsyscall page. This matches native behaviour by
setting the U bit on the L2-L4 page table entries and controlling
access using the L1 entries.

Signed-off-by: Ian Campbell <ian.campbell@xxxxxxxxxxxxx>
---
 linux-2.6-xen-sparse/arch/x86_64/mm/init-xen.c |    2 +-
 1 files changed, 1 insertion(+), 1 deletion(-)

diff -r f6928d636999 -r a40967e39652 
linux-2.6-xen-sparse/arch/x86_64/mm/init-xen.c
--- a/linux-2.6-xen-sparse/arch/x86_64/mm/init-xen.c    Tue May 22 15:32:50 
2007 +0100
+++ b/linux-2.6-xen-sparse/arch/x86_64/mm/init-xen.c    Thu May 24 09:14:43 
2007 +0100
@@ -580,7 +580,7 @@ void __init xen_init_pt(void)
 
        /* Construct mapping of initial pte page in our own directories. */
        init_level4_pgt[pgd_index(__START_KERNEL_map)] = 
-               mk_kernel_pgd(__pa_symbol(level3_kernel_pgt));
+               mk_kernel_pgd(__pa_symbol(level3_kernel_pgt) | _PAGE_USER);
        level3_kernel_pgt[pud_index(__START_KERNEL_map)] = 
                __pud(__pa_symbol(level2_kernel_pgt) |
                      _KERNPG_TABLE);

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