xen/arm: get privilege status

Use Xen features to figure out if we are privileged.

XENFEAT_dom0 was introduced by 23735 in xen-unstable.hg.

Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Acked-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>

2 files changed, 10 insertions, 0 deletions

diff --git a/arch/arm/xen/enlighten.c b/arch/arm/xen/enlighten.c
index 6a0217d4e662..c2a47a724870 100644
--- a/arch/arm/xen/enlighten.c
+++ b/arch/arm/xen/enlighten.c
@@ -1,6 +1,7 @@
 #include <xen/xen.h>
 #include <xen/interface/xen.h>
 #include <xen/interface/memory.h>
+#include <xen/features.h>
 #include <xen/platform_pci.h>
 #include <asm/xen/hypervisor.h>
 #include <asm/xen/hypercall.h>
@@ -66,6 +67,12 @@ static int __init xen_guest_init(void)
         }
         xen_domain_type = XEN_HVM_DOMAIN;
 
+        xen_setup_features();
+        if (xen_feature(XENFEAT_dom0))
+                xen_start_info->flags |= SIF_INITDOMAIN|SIF_PRIVILEGED;
+        else
+                xen_start_info->flags &= ~(SIF_INITDOMAIN|SIF_PRIVILEGED);
+
         if (!shared_info_page)
                 shared_info_page = (struct shared_info *)
                         get_zeroed_page(GFP_KERNEL);
diff --git a/include/xen/interface/features.h b/include/xen/interface/features.h
index b6ca39a069d8..131a6ccdba25 100644
--- a/include/xen/interface/features.h
+++ b/include/xen/interface/features.h
@@ -50,6 +50,9 @@
 /* x86: pirq can be used by HVM guests */
 #define XENFEAT_hvm_pirqs           10
 
+/* operation as Dom0 is supported */
+#define XENFEAT_dom0                      11
+
 #define XENFEAT_NR_SUBMAPS 1
 
 #endif /* __XEN_PUBLIC_FEATURES_H__ */