[PATCH 04/12] powerpc/pseries/svm: Add helpers for UV_SHARE_PAGE and UV_UNSHARE_PAGE

[Thiago Jung Bauermann]

From: Ram Pai <linux...@us.ibm.com>

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

Signed-off-by: Ram Pai <linux...@us.ibm.com>
Signed-off-by: Thiago Jung Bauermann <bauer...@linux.ibm.com>
---
 arch/powerpc/include/asm/ultravisor-api.h |  2 ++
 arch/powerpc/include/asm/ultravisor.h     | 14 ++++++++++++++
 2 files changed, 16 insertions(+)

diff --git a/arch/powerpc/include/asm/ultravisor-api.h 
b/arch/powerpc/include/asm/ultravisor-api.h
index 0e8b72081718..ed68b02869fd 100644
--- a/arch/powerpc/include/asm/ultravisor-api.h
+++ b/arch/powerpc/include/asm/ultravisor-api.h
@@ -20,6 +20,8 @@
 /* opcodes */
 #define UV_WRITE_PATE                  0xF104
 #define UV_ESM                         0xF110
+#define UV_SHARE_PAGE                  0xF130
+#define UV_UNSHARE_PAGE                        0xF134
 #define UV_RETURN                      0xF11C
 
 #endif /* _ASM_POWERPC_ULTRAVISOR_API_H */
diff --git a/arch/powerpc/include/asm/ultravisor.h 
b/arch/powerpc/include/asm/ultravisor.h
index 09e0a615d96f..537f7717d21a 100644
--- a/arch/powerpc/include/asm/ultravisor.h
+++ b/arch/powerpc/include/asm/ultravisor.h
@@ -44,6 +44,20 @@ static inline int uv_register_pate(u64 lpid, u64 dw0, u64 
dw1)
        return ucall(UV_WRITE_PATE, retbuf, lpid, dw0, dw1);
 }
 
+static inline int uv_share_page(u64 pfn, u64 npages)
+{
+       unsigned long retbuf[UCALL_BUFSIZE];
+
+       return ucall(UV_SHARE_PAGE, retbuf, pfn, npages);
+}
+
+static inline int uv_unshare_page(u64 pfn, u64 npages)
+{
+       unsigned long retbuf[UCALL_BUFSIZE];
+
+       return ucall(UV_UNSHARE_PAGE, retbuf, pfn, npages);
+}
+
 #endif /* !__ASSEMBLY__ */
 
 #endif /* _ASM_POWERPC_ULTRAVISOR_H */