[Xen-devel] [PATCH v6 10/10] public: add and enable XENFEAT_ARM_SMCCC_supported feature

[Volodymyr Babchuk <volodymyr_babchuk@xxxxxxxx>]

This feature indicates that hypervisor is compatible with ARM
SMC calling convention. Previously hypervisor would inject an
undefined instruction exception if an invalid SMC function were
called or would crash a domain if an invalid HVC function
were invoked.
XENFEAT_ARM_SMCCC_supported feature means that it safe to invoke
SMC/HVC calls that are compatible with SMC calling convention.

Signed-off-by: Volodymyr Babchuk <volodymyr_babchuk@xxxxxxxx>
---
 xen/common/kernel.c           | 3 +++
 xen/include/public/features.h | 3 +++
 2 files changed, 6 insertions(+)

diff --git a/xen/common/kernel.c b/xen/common/kernel.c
index 94fdf5c..8d137c5 100644
--- a/xen/common/kernel.c
+++ b/xen/common/kernel.c
@@ -394,6 +394,9 @@ DO(xen_version)(int cmd, XEN_GUEST_HANDLE_PARAM(void) arg)
                     (1U << XENFEAT_auto_translated_physmap);
             if ( is_hardware_domain(d) )
                 fi.submap |= 1U << XENFEAT_dom0;
+#ifdef CONFIG_ARM
+            fi.submap |= (1U << XENFEAT_ARM_SMCCC_supported);
+#endif
 #ifdef CONFIG_X86
             switch ( d->guest_type )
             {
diff --git a/xen/include/public/features.h b/xen/include/public/features.h
index 2110b04..1a989b8 100644
--- a/xen/include/public/features.h
+++ b/xen/include/public/features.h
@@ -102,6 +102,9 @@
 /* Guest can use XENMEMF_vnode to specify virtual node for memory op. */
 #define XENFEAT_memory_op_vnode_supported 13
 
+/* arm: Hypervisor supports ARM SMC calling convention. */
+#define XENFEAT_ARM_SMCCC_supported       14
+
 #define XENFEAT_NR_SUBMAPS 1
 
 #endif /* __XEN_PUBLIC_FEATURES_H__ */
-- 
2.7.4


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