powerpc/xmon: Check for HV mode when dumping XIVE info from OPAL

[ Upstream commit c3e0dbd7f780a58c4695f1cd8fc8afde80376737 ]

Currently, the xmon 'dx' command calls OPAL to dump the XIVE state in
the OPAL logs and also outputs some of the fields of the internal XIVE
structures in Linux. The OPAL calls can only be done on baremetal
(PowerNV) and they crash a pseries machine. Fix by checking the
hypervisor feature of the CPU.

Signed-off-by: Cédric Le Goater <clg@kaod.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20190814154754.23682-2-clg@kaod.org
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/arch/powerpc/xmon/xmon.c b/arch/powerpc/xmon/xmon.c
index 6b9038a3e79f0f617f149dd33ca790c3dd61d6e6..5a739588aa50559418d8f283df31f76644c1e7f1 100644 (file)
--- a/arch/powerpc/xmon/xmon.c
+++ b/arch/powerpc/xmon/xmon.c
@@ -2438,13 +2438,16 @@ static void dump_pacas(void)
 static void dump_one_xive(int cpu)
 {
        unsigned int hwid = get_hard_smp_processor_id(cpu);
+       bool hv = cpu_has_feature(CPU_FTR_HVMODE);
 
-       opal_xive_dump(XIVE_DUMP_TM_HYP, hwid);
-       opal_xive_dump(XIVE_DUMP_TM_POOL, hwid);
-       opal_xive_dump(XIVE_DUMP_TM_OS, hwid);
-       opal_xive_dump(XIVE_DUMP_TM_USER, hwid);
-       opal_xive_dump(XIVE_DUMP_VP, hwid);
-       opal_xive_dump(XIVE_DUMP_EMU_STATE, hwid);
+       if (hv) {
+               opal_xive_dump(XIVE_DUMP_TM_HYP, hwid);
+               opal_xive_dump(XIVE_DUMP_TM_POOL, hwid);
+               opal_xive_dump(XIVE_DUMP_TM_OS, hwid);
+               opal_xive_dump(XIVE_DUMP_TM_USER, hwid);
+               opal_xive_dump(XIVE_DUMP_VP, hwid);
+               opal_xive_dump(XIVE_DUMP_EMU_STATE, hwid);
+       }
 
        if (setjmp(bus_error_jmp) != 0) {
                catch_memory_errors = 0;