xen/xen_initial_domain: check that xen_start_info is initialized
Since commit commit 4c071ee5268f7234c3d084b6093bebccc28cdcba ("arm:
initial Xen support") PV on HVM guests can be xen_initial_domain.
However PV on HVM guests might have an unitialized xen_start_info, so
check before accessing its fields.
Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Acked-by: Ian Campbell <Ian.Campbell@citrix.com>
Reported-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
diff --git a/include/xen/xen.h b/include/xen/xen.h
index 2c0d3a5..a74d436 100644
--- a/include/xen/xen.h
+++ b/include/xen/xen.h
@@ -24,7 +24,7 @@
#include <asm/xen/hypervisor.h>
#define xen_initial_domain() (xen_domain() && \
- xen_start_info->flags & SIF_INITDOMAIN)
+ xen_start_info && xen_start_info->flags & SIF_INITDOMAIN)
#else /* !CONFIG_XEN_DOM0 */
#define xen_initial_domain() (0)
#endif /* CONFIG_XEN_DOM0 */