Pu Lehui 43e8f76006 powerpc/kprobes: Fix kprobe Oops happens in booke ... When using kprobe on powerpc booke series processor, Oops happens as show bellow: / # echo "p:myprobe do_nanosleep" > /sys/kernel/debug/tracing/kprobe_events / # echo 1 > /sys/kernel/debug/tracing/events/kprobes/myprobe/enable / # sleep 1 [ 50.076730] Oops: Exception in kernel mode, sig: 5 [#1] [ 50.077017] BE PAGE_SIZE=4K SMP NR_CPUS=24 QEMU e500 [ 50.077221] Modules linked in: [ 50.077462] CPU: 0 PID: 77 Comm: sleep Not tainted 5.14.0-rc4-00022-g251a1524293d #21 [ 50.077887] NIP: c0b9c4e0 LR: c00ebecc CTR: 00000000 [ 50.078067] REGS: c3883de0 TRAP: 0700 Not tainted (5.14.0-rc4-00022-g251a1524293d) [ 50.078349] MSR: 00029000 <CE,EE,ME> CR: 24000228 XER: 20000000 [ 50.078675] [ 50.078675] GPR00: c00ebdf0 c3883e90 c313e300 c3883ea0 00000001 00000000 c3883ecc 00000001 [ 50.078675] GPR08: c100598c c00ea250 00000004 00000000 24000222 102490c2 bff4180c 101e60d4 [ 50.078675] GPR16: 00000000 102454ac 00000040 10240000 10241100 102410f8 10240000 00500000 [ 50.078675] GPR24: 00000002 00000000 c3883ea0 00000001 00000000 0000c350 3b9b8d50 00000000 [ 50.080151] NIP [c0b9c4e0] do_nanosleep+0x0/0x190 [ 50.080352] LR [c00ebecc] hrtimer_nanosleep+0x14c/0x1e0 [ 50.080638] Call Trace: [ 50.080801] [c3883e90] [c00ebdf0] hrtimer_nanosleep+0x70/0x1e0 (unreliable) [ 50.081110] [c3883f00] [c00ec004] sys_nanosleep_time32+0xa4/0x110 [ 50.081336] [c3883f40] [c001509c] ret_from_syscall+0x0/0x28 [ 50.081541] --- interrupt: c00 at 0x100a4d08 [ 50.081749] NIP: 100a4d08 LR: 101b5234 CTR: 00000003 [ 50.081931] REGS: c3883f50 TRAP: 0c00 Not tainted (5.14.0-rc4-00022-g251a1524293d) [ 50.082183] MSR: 0002f902 <CE,EE,PR,FP,ME> CR: 24000222 XER: 00000000 [ 50.082457] [ 50.082457] GPR00: 000000a2 bf980040 1024b4d0 bf980084 bf980084 64000000 00555345 fefefeff [ 50.082457] GPR08: 7f7f7f7f 101e0000 00000069 00000003 28000422 102490c2 bff4180c 101e60d4 [ 50.082457] GPR16: 00000000 102454ac 00000040 10240000 10241100 102410f8 10240000 00500000 [ 50.082457] GPR24: 00000002 bf9803f4 10240000 00000000 00000000 100039e0 00000000 102444e8 [ 50.083789] NIP [100a4d08] 0x100a4d08 [ 50.083917] LR [101b5234] 0x101b5234 [ 50.084042] --- interrupt: c00 [ 50.084238] Instruction dump: [ 50.084483] 4bfffc40 60000000 60000000 60000000 9421fff0 39400402 914200c0 38210010 [ 50.084841] 4bfffc20 00000000 00000000 00000000 <7fe00008> 7c0802a6 7c892378 93c10048 [ 50.085487] ---[ end trace f6fffe98e2fa8f3e ]--- [ 50.085678] Trace/breakpoint trap There is no real mode for booke arch and the MMU translation is always on. The corresponding MSR_IS/MSR_DS bit in booke is used to switch the address space, but not for real mode judgment. Fixes: 21f8b2fa3c ("powerpc/kprobes: Ignore traps that happened in real mode") Signed-off-by: Pu Lehui <pulehui@huawei.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20210809023658.218915-1-pulehui@huawei.com		2021-08-09 16:31:54 +10:00
..
boot	powerpc updates for 5.14	2021-07-02 12:54:34 -07:00
configs	TTY / Serial patches for 5.14-rc1	2021-07-05 14:08:24 -07:00
crypto	crypto: powepc/sha1 - remove unneeded semicolon	2021-03-07 15:13:14 +11:00
include	powerpc/32: Fix critical and debug interrupts on BOOKE	2021-08-07 08:53:59 +10:00
kernel	powerpc/kprobes: Fix kprobe Oops happens in booke	2021-08-09 16:31:54 +10:00
kexec	powerpc updates for 5.14	2021-07-02 12:54:34 -07:00
kvm	KVM: PPC: Book3S HV Nested: Sanitise H_ENTER_NESTED TM state	2021-07-23 16:19:38 +10:00
lib	powerpc: Only build restart_table.c for 64s	2021-07-01 22:50:54 +10:00
math-emu	powerpc/64s: avoid reloading (H)SRR registers if they are still valid	2021-06-25 00:06:55 +10:00
mm	powerpc fixes for 5.14 #2	2021-07-09 10:26:52 -07:00
net	powerpc/bpf: Reject atomic ops in ppc32 JIT	2021-07-05 22:23:25 +10:00
perf	powerpc updates for 5.14	2021-07-02 12:54:34 -07:00
platforms	powerpc/pseries: Fix update of LPAR security flavor after LPM	2021-08-07 08:53:59 +10:00
purgatory	powerpc/kexec: Don't use .machine ppc64 in trampoline_64.S	2021-04-08 21:17:43 +10:00
sysdev	powerpc/xive: Fix error handling when allocating an IPI	2021-07-05 22:23:25 +10:00
tools	powerpc/tools: Remove 90 line limit in checkpatch script	2020-09-08 22:57:11 +10:00
xmon	powerpc updates for 5.14	2021-07-02 12:54:34 -07:00
Kbuild
Kconfig	powerpc updates for 5.14	2021-07-02 12:54:34 -07:00
Kconfig.debug	powerpc: Make PPC_IRQ_SOFT_MASK_DEBUG depend on PPC64	2021-06-25 00:07:09 +10:00
Makefile	Kbuild updates for v5.14	2021-07-10 11:01:38 -07:00
Makefile.postlink	powerpc: unrel_branch_check.sh: use nm to find symbol value	2020-09-02 11:00:22 +10:00