[PATCH v2 04/13] 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     | 15 +++++++++++++++
 2 files changed, 17 insertions(+)

diff --git a/arch/powerpc/include/asm/ultravisor-api.h 
b/arch/powerpc/include/asm/ultravisor-api.h
index fe9a0d8d7673..c7513bbadf57 100644
--- a/arch/powerpc/include/asm/ultravisor-api.h
+++ b/arch/powerpc/include/asm/ultravisor-api.h
@@ -25,6 +25,8 @@
 #define UV_UNREGISTER_MEM_SLOT         0xF124
 #define UV_PAGE_IN                     0xF128
 #define UV_PAGE_OUT                    0xF12C
+#define UV_SHARE_PAGE                  0xF130
+#define UV_UNSHARE_PAGE                        0xF134
 #define UV_PAGE_INVAL                  0xF138
 #define UV_SVM_TERMINATE               0xF13C
 
diff --git a/arch/powerpc/include/asm/ultravisor.h 
b/arch/powerpc/include/asm/ultravisor.h
index f5dc5af739b8..f7418b663a0e 100644
--- a/arch/powerpc/include/asm/ultravisor.h
+++ b/arch/powerpc/include/asm/ultravisor.h
@@ -91,6 +91,21 @@ static inline int uv_svm_terminate(u64 lpid)
 
        return ucall(UV_SVM_TERMINATE, retbuf, lpid);
 }
+
+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 */