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    Subject[ 144/180] x86, amd, xen: Avoid NULL pointer paravirt references
    2.6.32-longterm review patch.  If anyone has any objections, please let me know.

    ------------------

    From: Konrad Rzeszutek Wilk <konrad@darnok.org>

    commit 1ab46fd319bcf1fcd9fb6311727d532b580e4eba upstream.

    Stub out MSR methods that aren't actually needed. This fixes a crash
    as Xen Dom0 on AMD Trinity systems. A bigger patch should be added to
    remove the paravirt machinery completely for the methods which
    apparently have no users!

    Reported-by: Andre Przywara <andre.przywara@amd.com>
    Link: http://lkml.kernel.org/r/20120530222356.GA28417@andromeda.dapyr.net
    Signed-off-by: H. Peter Anvin <hpa@zytor.com>
    Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
    Signed-off-by: Willy Tarreau <w@1wt.eu>
    ---
    arch/x86/xen/enlighten.c | 3 +++
    1 files changed, 3 insertions(+), 0 deletions(-)

    diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c
    index 0087b00..d52f895 100644
    --- a/arch/x86/xen/enlighten.c
    +++ b/arch/x86/xen/enlighten.c
    @@ -945,7 +945,10 @@ static const struct pv_cpu_ops xen_cpu_ops __initdata = {
    .wbinvd = native_wbinvd,

    .read_msr = native_read_msr_safe,
    + .rdmsr_regs = native_rdmsr_safe_regs,
    .write_msr = xen_write_msr_safe,
    + .wrmsr_regs = native_wrmsr_safe_regs,
    +
    .read_tsc = native_read_tsc,
    .read_pmc = native_read_pmc,

    --
    1.7.2.1.45.g54fbc




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