4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Michael Neuling <mi...@neuling.org>

commit 191eccb1580939fb0d47deb405b82a85b0379070 upstream.

A new hypervisor call has been defined to communicate various
characteristics of the CPU to guests. Add definitions for the hcall
number, flags and a wrapper function.

Signed-off-by: Michael Neuling <mi...@neuling.org>
Signed-off-by: Michael Ellerman <m...@ellerman.id.au>
[Balbir fixed conflicts in backport]
Signed-off-by: Balbir Singh <bsinghar...@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>

---
 arch/powerpc/include/asm/hvcall.h         |   17 +++++++++++++++++
 arch/powerpc/include/asm/plpar_wrappers.h |   14 ++++++++++++++
 2 files changed, 31 insertions(+)

--- a/arch/powerpc/include/asm/hvcall.h
+++ b/arch/powerpc/include/asm/hvcall.h
@@ -240,6 +240,7 @@
 #define H_GET_HCA_INFO          0x1B8
 #define H_GET_PERF_COUNT        0x1BC
 #define H_MANAGE_TRACE          0x1C0
+#define H_GET_CPU_CHARACTERISTICS 0x1C8
 #define H_FREE_LOGICAL_LAN_BUFFER 0x1D4
 #define H_QUERY_INT_STATE       0x1E4
 #define H_POLL_PENDING         0x1D8
@@ -306,6 +307,17 @@
 #define H_SET_MODE_RESOURCE_ADDR_TRANS_MODE    3
 #define H_SET_MODE_RESOURCE_LE                 4
 
+/* H_GET_CPU_CHARACTERISTICS return values */
+#define H_CPU_CHAR_SPEC_BAR_ORI31      (1ull << 63) // IBM bit 0
+#define H_CPU_CHAR_BCCTRL_SERIALISED   (1ull << 62) // IBM bit 1
+#define H_CPU_CHAR_L1D_FLUSH_ORI30     (1ull << 61) // IBM bit 2
+#define H_CPU_CHAR_L1D_FLUSH_TRIG2     (1ull << 60) // IBM bit 3
+#define H_CPU_CHAR_L1D_THREAD_PRIV     (1ull << 59) // IBM bit 4
+
+#define H_CPU_BEHAV_FAVOUR_SECURITY    (1ull << 63) // IBM bit 0
+#define H_CPU_BEHAV_L1D_FLUSH_PR       (1ull << 62) // IBM bit 1
+#define H_CPU_BEHAV_BNDS_CHK_SPEC_BAR  (1ull << 61) // IBM bit 2
+
 #ifndef __ASSEMBLY__
 
 /**
@@ -433,6 +445,11 @@ static inline unsigned long cmo_get_page
 }
 #endif /* CONFIG_PPC_PSERIES */
 
+struct h_cpu_char_result {
+       u64 character;
+       u64 behaviour;
+};
+
 #endif /* __ASSEMBLY__ */
 #endif /* __KERNEL__ */
 #endif /* _ASM_POWERPC_HVCALL_H */
--- a/arch/powerpc/include/asm/plpar_wrappers.h
+++ b/arch/powerpc/include/asm/plpar_wrappers.h
@@ -340,4 +340,18 @@ static inline long plapr_set_watchpoint0
        return plpar_set_mode(0, H_SET_MODE_RESOURCE_SET_DAWR, dawr0, dawrx0);
 }
 
+static inline long plpar_get_cpu_characteristics(struct h_cpu_char_result *p)
+{
+       unsigned long retbuf[PLPAR_HCALL_BUFSIZE];
+       long rc;
+
+       rc = plpar_hcall(H_GET_CPU_CHARACTERISTICS, retbuf);
+       if (rc == H_SUCCESS) {
+               p->character = retbuf[0];
+               p->behaviour = retbuf[1];
+       }
+
+       return rc;
+}
+
 #endif /* _ASM_POWERPC_PLPAR_WRAPPERS_H */


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