KVM: PPC: Book3S HV: trace_tlbie must not be called in realmode
commit
19ce7909ed11c49f7eddf59e7f49cd3062bf83d5 upstream.
This crashes with a "Bad real address for load" attempting to load
from the vmalloc region in realmode (faulting address is in DAR).
Oops: Bad interrupt in KVM entry/exit code, sig: 6 [#1]
LE SMP NR_CPUS=2048 NUMA PowerNV
CPU: 53 PID: 6582 Comm: qemu-system-ppc Not tainted 4.16.0-01530-g43d1859f0994
NIP:
c0000000000155ac LR:
c0000000000c2430 CTR:
c000000000015580
REGS:
c000000fff76dd80 TRAP: 0200 Not tainted (4.16.0-01530-g43d1859f0994)
MSR:
9000000000201003 <SF,HV,ME,RI,LE> CR:
48082222 XER:
00000000
CFAR:
0000000102900ef0 DAR:
d00017fffd941a28 DSISR:
00000040 SOFTE: 3
NIP [
c0000000000155ac] perf_trace_tlbie+0x2c/0x1a0
LR [
c0000000000c2430] do_tlbies+0x230/0x2f0
I suspect the reason is the per-cpu data is not in the linear chunk.
This could be restored if that was able to be fixed, but for now,
just remove the tracepoints.
Fixes:
0428491cba92 ("powerpc/mm: Trace tlbie(l) instructions")
Cc: stable@vger.kernel.org # v4.13+
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>