Re: [PATCH v2 04/13] powerpc/pseries/svm: Add helpers for UV_SHARE_PAGE and UV_UNSHARE_PAGE

From: Ram Pai <redacted>

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

Signed-off-by: Ram Pai <redacted>
Signed-off-by: Thiago Jung Bauermann <redacted>
---
  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 */