Introduce UV_RESTRICTED_SPR_READ. Hypervisor loses previlege
to access some registers when Ultravisor is enabled. Hypervisor
can request read access to those registers using
UV_RESTRICTED_SPR_READ ucall.
Signed-off-by: Ram Pai <linuxram@xxxxxxxxxx>
---
arch/powerpc/include/asm/ucall-api.h | 11 +++++++++++
arch/powerpc/include/uapi/asm/uapi_uvcall.h | 1 +
2 files changed, 12 insertions(+)
diff --git a/arch/powerpc/include/asm/ucall-api.h b/arch/powerpc/include/asm/ucall-api.h
index 7723b4e..ffafd9e 100644
--- a/arch/powerpc/include/asm/ucall-api.h
+++ b/arch/powerpc/include/asm/ucall-api.h
@@ -37,5 +37,16 @@ static inline int uv_restricted_spr_write(u64 reg, u64 val)
return plpar_ucall(UV_RESTRICTED_SPR_WRITE, retbuf, reg, val);
}
+static inline int uv_restricted_spr_read(u64 reg, u64 *val)
+{
+ long rc;
+ unsigned long retbuf[PLPAR_UCALL_BUFSIZE];
+
+ rc = plpar_ucall(UV_RESTRICTED_SPR_READ, retbuf, reg);
+
+ *val = retbuf[0];
+ return rc;
+}
+
#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 d76dd1f..bbcd026 100644
--- a/arch/powerpc/include/uapi/asm/uapi_uvcall.h
+++ b/arch/powerpc/include/uapi/asm/uapi_uvcall.h
@@ -10,4 +10,5 @@
#define UV_WRITE_PATE 0xf104
#define UV_RESTRICTED_SPR_WRITE 0xf108
+#define UV_RESTRICTED_SPR_READ 0xf10C
#endif /* #ifndef UAPI_UC_H */
--
1.8.3.1
