Introduce UV_RESTRICTED_SPR_WRITE. Hypervisor loses
access to some registers when Ultravisor is enabled. Hypervisor
can request write access to those registers using
UV_RESTRICTED_SPR_WRITE ucall.
Signed-off-by: Ram Pai <linuxram@xxxxxxxxxx>
---
arch/powerpc/include/asm/ucall-api.h | 6 ++++++
arch/powerpc/include/uapi/asm/uapi_uvcall.h | 1 +
2 files changed, 7 insertions(+)
diff --git a/arch/powerpc/include/asm/ucall-api.h b/arch/powerpc/include/asm/ucall-api.h
index f411dcb..7723b4e 100644
--- a/arch/powerpc/include/asm/ucall-api.h
+++ b/arch/powerpc/include/asm/ucall-api.h
@@ -31,5 +31,11 @@ static inline int uv_register_pate(u64 lpid, u64 dw0, u64 dw1)
return plpar_ucall(UV_WRITE_PATE, retbuf, lpid, dw0, dw1);
}
+static inline int uv_restricted_spr_write(u64 reg, u64 val)
+{
+ unsigned long retbuf[PLPAR_UCALL_BUFSIZE];
+
+ return plpar_ucall(UV_RESTRICTED_SPR_WRITE, retbuf, reg, val);
+}
#endif /* __ASSEMBLY__ */
#endif /* _ASM_POWERPC_UCALL_API_H */
diff --git a/arch/powerpc/include/uapi/asm/uapi_uvcall.h b/arch/powerpc/include/uapi/asm/uapi_uvcall.h
index 7f018cf..d76dd1f 100644
--- a/arch/powerpc/include/uapi/asm/uapi_uvcall.h
+++ b/arch/powerpc/include/uapi/asm/uapi_uvcall.h
@@ -9,4 +9,5 @@
#define UAPI_UC_H
#define UV_WRITE_PATE 0xf104
+#define UV_RESTRICTED_SPR_WRITE 0xf108
#endif /* #ifndef UAPI_UC_H */
--
1.8.3.1
