xen/bootup: allow read_tscp call for Xen PV guests.

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: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c
index e1e4636b08691a27b3a8e149caea79bf3df79582..c1461de20408c225df1f2eccb538a1418b0b87c6 100644 (file)
--- a/arch/x86/xen/enlighten.c
+++ b/arch/x86/xen/enlighten.c
@@ -1175,6 +1175,8 @@ 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