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powerpc/xmon: don't access ASDR in VMs 

ASDR is HV-privileged and must only be accessed in HV-mode.
Fixes a Program Check (0x700) when xmon in a VM dumps SPRs.

Fixes: d1e1b351f5 ("powerpc/xmon: Add ISA v3.0 SPRs to SPR dump")
Cc: stable@vger.kernel.org # v4.14+
Signed-off-by: Sukadev Bhattiprolu <sukadev@linux.ibm.com>
Reviewed-by: Andrew Donnellan <ajd@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20200107021633.GB29843@us.ibm.com
This commit is contained in:
Sukadev Bhattiprolu 2020-01-06 13:50:02 -06:00 committed by Michael Ellerman
parent eeb09917c1
commit c2a20711fc
1 changed files with 4 additions and 5 deletions
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9
arch/powerpc/xmon/xmon.c
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@ -1949,15 +1949,14 @@ static void dump_300_sprs(void)
printf("pidr = %.16lx tidr = %.16lx\n",
mfspr(SPRN_PID), mfspr(SPRN_TIDR));
printf("asdr = %.16lx psscr = %.16lx\n",
mfspr(SPRN_ASDR), hv ? mfspr(SPRN_PSSCR)
: mfspr(SPRN_PSSCR_PR));
printf("psscr = %.16lx\n",
hv ? mfspr(SPRN_PSSCR) : mfspr(SPRN_PSSCR_PR));
if (!hv)
return;
printf("ptcr = %.16lx\n",
mfspr(SPRN_PTCR));
printf("ptcr = %.16lx asdr = %.16lx\n",
mfspr(SPRN_PTCR), mfspr(SPRN_ASDR));
#endif
}