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: Paul Gortmaker <paul.gortmaker@windriver.com>

diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c
index 25d787c17ad83fb586b5f5e72c604a08808c4d62..7fa0dc02b9396c6e9cf4e572c39fb7295c840d61 100644 (file)
--- a/arch/x86/xen/enlighten.c
+++ b/arch/x86/xen/enlighten.c
@@ -952,6 +952,8 @@ static const struct pv_cpu_ops xen_cpu_ops __initdata = {
        .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