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

From: Thiago Jung Bauermann
Date: Sat Jul 13 2019 - 02:01:10 EST


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 | 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 */