[PATCH v2 08/15] Drivers: hv: Move hv_call_(get|set)_vp_registers() declarations

[Naman Jain]

Move hv_call_get_vp_registers() and hv_call_set_vp_registers()
declarations from drivers/hv/mshv.h to include/asm-generic/mshyperv.h.

These functions are defined in mshv_common.c and are going to be called
from both drivers/hv/ and arch/x86/hyperv/hv_vtl.c. The latter never
included mshv.h, relying on implicit declaration visibility. Moving the
declarations to the arch-generic Hyper-V header makes them properly
visible to all architecture-specific callers.

Provide static inline stubs returning -EOPNOTSUPP when neither
CONFIG_MSHV_ROOT nor CONFIG_MSHV_VTL is enabled.

Signed-off-by: Naman Jain <namjain at linux.microsoft.com>
---
 drivers/hv/mshv.h              |  8 --------
 include/asm-generic/mshyperv.h | 26 ++++++++++++++++++++++++++
 2 files changed, 26 insertions(+), 8 deletions(-)

diff --git a/drivers/hv/mshv.h b/drivers/hv/mshv.h
index d4813df92b9c..0fcb7f9ba6a9 100644
--- a/drivers/hv/mshv.h
+++ b/drivers/hv/mshv.h
@@ -14,14 +14,6 @@
 	memchr_inv(&((STRUCT).MEMBER), \
 		   0, sizeof_field(typeof(STRUCT), MEMBER))
 
-int hv_call_get_vp_registers(u32 vp_index, u64 partition_id, u16 count,
-			     union hv_input_vtl input_vtl,
-			     struct hv_register_assoc *registers);
-
-int hv_call_set_vp_registers(u32 vp_index, u64 partition_id, u16 count,
-			     union hv_input_vtl input_vtl,
-			     struct hv_register_assoc *registers);
-
 int hv_call_get_partition_property(u64 partition_id, u64 property_code,
 				   u64 *property_value);
 
diff --git a/include/asm-generic/mshyperv.h b/include/asm-generic/mshyperv.h
index 8cdf2a9fbdfb..ef0b9466808c 100644
--- a/include/asm-generic/mshyperv.h
+++ b/include/asm-generic/mshyperv.h
@@ -394,6 +394,32 @@ static inline int hv_deposit_memory(u64 partition_id, u64 status)
 	return hv_deposit_memory_node(NUMA_NO_NODE, partition_id, status);
 }
 
+#if IS_ENABLED(CONFIG_MSHV_ROOT) || IS_ENABLED(CONFIG_MSHV_VTL)
+int hv_call_get_vp_registers(u32 vp_index, u64 partition_id, u16 count,
+			     union hv_input_vtl input_vtl,
+			     struct hv_register_assoc *registers);
+
+int hv_call_set_vp_registers(u32 vp_index, u64 partition_id, u16 count,
+			     union hv_input_vtl input_vtl,
+			     struct hv_register_assoc *registers);
+#else
+static inline int hv_call_get_vp_registers(u32 vp_index, u64 partition_id,
+					   u16 count,
+					   union hv_input_vtl input_vtl,
+					   struct hv_register_assoc *registers)
+{
+	return -EOPNOTSUPP;
+}
+
+static inline int hv_call_set_vp_registers(u32 vp_index, u64 partition_id,
+					   u16 count,
+					   union hv_input_vtl input_vtl,
+					   struct hv_register_assoc *registers)
+{
+	return -EOPNOTSUPP;
+}
+#endif /* CONFIG_MSHV_ROOT || CONFIG_MSHV_VTL */
+
 #if IS_ENABLED(CONFIG_HYPERV_VTL_MODE)
 u8 __init get_vtl(void);
 void mshv_vtl_return_call(struct mshv_vtl_cpu_context *vtl0);
-- 
2.43.0