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    Subject[tip:x86/vdso] x86-64, xen: Enable the vvar mapping
    Commit-ID:  5d5791af4c0d4fd32093882357506355c3357503
    Gitweb: http://git.kernel.org/tip/5d5791af4c0d4fd32093882357506355c3357503
    Author: Andy Lutomirski <luto@MIT.EDU>
    AuthorDate: Wed, 3 Aug 2011 09:31:52 -0400
    Committer: H. Peter Anvin <hpa@linux.intel.com>
    CommitDate: Thu, 4 Aug 2011 16:13:47 -0700

    x86-64, xen: Enable the vvar mapping

    Xen needs to handle VVAR_PAGE, introduced in git commit:
    9fd67b4ed0714ab718f1f9bd14c344af336a6df7
    x86-64: Give vvars their own page

    Otherwise we die during bootup with a message like:

    (XEN) mm.c:940:d10 Error getting mfn 1888 (pfn 1e3e48) from L1 entry
    8000000001888465 for l1e_owner=10, pg_owner=10
    (XEN) mm.c:5049:d10 ptwr_emulate: could not get_page_from_l1e()
    [ 0.000000] BUG: unable to handle kernel NULL pointer dereference at (null)
    [ 0.000000] IP: [<ffffffff8103a930>] xen_set_pte+0x20/0xe0

    Signed-off-by: Andy Lutomirski <luto@mit.edu>
    Link: http://lkml.kernel.org/r/4659478ed2f3480938f96491c2ecbe2b2e113a23.1312378163.git.luto@mit.edu
    Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
    Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
    ---
    arch/x86/xen/mmu.c | 4 +++-
    1 files changed, 3 insertions(+), 1 deletions(-)

    diff --git a/arch/x86/xen/mmu.c b/arch/x86/xen/mmu.c
    index 0ccccb6..2e78619 100644
    --- a/arch/x86/xen/mmu.c
    +++ b/arch/x86/xen/mmu.c
    @@ -1829,6 +1829,7 @@ static void xen_set_fixmap(unsigned idx, phys_addr_t phys, pgprot_t prot)
    # endif
    #else
    case VSYSCALL_LAST_PAGE ... VSYSCALL_FIRST_PAGE:
    + case VVAR_PAGE:
    #endif
    case FIX_TEXT_POKE0:
    case FIX_TEXT_POKE1:
    @@ -1869,7 +1870,8 @@ static void xen_set_fixmap(unsigned idx, phys_addr_t phys, pgprot_t prot)
    #ifdef CONFIG_X86_64
    /* Replicate changes to map the vsyscall page into the user
    pagetable vsyscall mapping. */
    - if (idx >= VSYSCALL_LAST_PAGE && idx <= VSYSCALL_FIRST_PAGE) {
    + if ((idx >= VSYSCALL_LAST_PAGE && idx <= VSYSCALL_FIRST_PAGE) ||
    + idx == VVAR_PAGE) {
    unsigned long vaddr = __fix_to_virt(idx);
    set_pte_vaddr_pud(level3_user_vsyscall, vaddr, pte);
    }

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