[PATCH v3 05/16] powerpc/pseries/svm: Add helpers for UV_SHARE_PAGE and UV_UNSHARE_PAGE

[Thiago Jung Bauermann]

From: Ram Pai <linuxram@xxxxxxxxxx>

These functions are used when the guest wants to grant the hypervisor
access to certain pages.

Signed-off-by: Ram Pai <linuxram@xxxxxxxxxx>
Signed-off-by: Thiago Jung Bauermann <bauerman@xxxxxxxxxxxxx>
---
 arch/powerpc/include/asm/ultravisor-api.h |  2 ++
 arch/powerpc/include/asm/ultravisor.h     | 24 +++++++++++++++++++++++
 2 files changed, 26 insertions(+)

diff --git a/arch/powerpc/include/asm/ultravisor-api.h b/arch/powerpc/include/asm/ultravisor-api.h
index d3503d1f447e..142b0576b89f 100644
--- a/arch/powerpc/include/asm/ultravisor-api.h
+++ b/arch/powerpc/include/asm/ultravisor-api.h
@@ -22,5 +22,7 @@
 
 /* opcodes */
 #define UV_ESM				0xF110
+#define UV_SHARE_PAGE			0xF130
+#define UV_UNSHARE_PAGE			0xF134
 
 #endif /* _ASM_POWERPC_ULTRAVISOR_API_H */
diff --git a/arch/powerpc/include/asm/ultravisor.h b/arch/powerpc/include/asm/ultravisor.h
new file mode 100644
index 000000000000..a930aec8c1e3
--- /dev/null
+++ b/arch/powerpc/include/asm/ultravisor.h
@@ -0,0 +1,24 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Ultravisor definitions
+ *
+ * Copyright 2019, IBM Corporation.
+ *
+ */
+#ifndef _ASM_POWERPC_ULTRAVISOR_H
+#define _ASM_POWERPC_ULTRAVISOR_H
+
+#include <asm/asm-prototypes.h>
+#include <asm/ultravisor-api.h>
+
+static inline int uv_share_page(u64 pfn, u64 npages)
+{
+	return ucall_norets(UV_SHARE_PAGE, pfn, npages);
+}
+
+static inline int uv_unshare_page(u64 pfn, u64 npages)
+{
+	return ucall_norets(UV_UNSHARE_PAGE, pfn, npages);
+}
+
+#endif	/* _ASM_POWERPC_ULTRAVISOR_H */