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    Subject[PATCH 072/270] xen/bootup: allow read_tscp call for Xen PV guests.
    Date
    3.5.7u1 -stable review patch.  If anyone has any objections, please let me know.

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

    From: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>

    commit cd0608e71e9757f4dae35bcfb4e88f4d1a03a8ab upstream.

    The hypervisor will trap it. However without this patch,
    we would crash as the .read_tscp is set to NULL. This patch
    fixes it and sets it to the native_read_tscp call.

    Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
    Signed-off-by: Herton Ronaldo Krzesinski <herton.krzesinski@canonical.com>
    ---
    arch/x86/xen/enlighten.c | 2 ++
    1 file changed, 2 insertions(+)

    diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c
    index 405307f..93dcfdc 100644
    --- a/arch/x86/xen/enlighten.c
    +++ b/arch/x86/xen/enlighten.c
    @@ -1131,6 +1131,8 @@ static const struct pv_cpu_ops xen_cpu_ops __initconst = {
    .read_tsc = native_read_tsc,
    .read_pmc = native_read_pmc,

    + .read_tscp = native_read_tscp,
    +
    .iret = xen_iret,
    .irq_enable_sysexit = xen_sysexit,
    #ifdef CONFIG_X86_64
    --
    1.7.9.5


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