[PATCH v3 19/34] xen/riscv: introduce guest_access.h

[Oleksii Kurochko <oleksii.kurochko@xxxxxxxxx>]

All necessary dummiy implementation of functions in this header
will be introduced in stubs.c

Signed-off-by: Oleksii Kurochko <oleksii.kurochko@xxxxxxxxx>
---
Changes in V3:
 - remove unnessary inclusion of types.h header.
 - drop copy_to_guest_phys. it isn't needed yet
 - add SPDX
 - add comment above guest_handle_okay()
 - update the commit message
---
Changes in V2:
 - change xen/mm.h to xen/types.h
---
 xen/arch/riscv/include/asm/guest_access.h | 29 +++++++++++++++++++++++
 1 file changed, 29 insertions(+)
 create mode 100644 xen/arch/riscv/include/asm/guest_access.h

diff --git a/xen/arch/riscv/include/asm/guest_access.h 
b/xen/arch/riscv/include/asm/guest_access.h
new file mode 100644
index 0000000000..c55951f538
--- /dev/null
+++ b/xen/arch/riscv/include/asm/guest_access.h
@@ -0,0 +1,29 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+#ifndef __ASM_RISCV_GUEST_ACCESS_H__
+#define __ASM_RISCV_GUEST_ACCESS_H__
+
+unsigned long raw_copy_to_guest(void *to, const void *from, unsigned len);
+unsigned long raw_copy_from_guest(void *to, const void *from, unsigned len);
+unsigned long raw_clear_guest(void *to, unsigned int len);
+
+#define __raw_copy_to_guest raw_copy_to_guest
+#define __raw_copy_from_guest raw_copy_from_guest
+#define __raw_clear_guest raw_clear_guest
+
+/*
+ * Pre-validate a guest handle.
+ * Allows use of faster __copy_* functions.
+ */
+/* All RISCV guests are paging mode external and hence safe */
+#define guest_handle_okay(hnd, nr) (1)
+#define guest_handle_subrange_okay(hnd, first, last) (1)
+
+#endif /* __ASM_RISCV_GUEST_ACCESS_H__ */
+/*
+ * Local variables:
+ * mode: C
+ * c-file-style: "BSD"
+ * c-basic-offset: 4
+ * indent-tabs-mode: nil
+ * End:
+ */
-- 
2.43.0