From: Santosh Sivaraj <santosh@fossix.org>
To: linuxppc-dev <linuxppc-dev@lists.ozlabs.org>
Cc: "Aneesh Kumar K.V" <aneesh.kumar@linux.ibm.com>,
Mahesh Salgaonkar <mahesh@linux.ibm.com>,
Nicholas Piggin <npiggin@gmail.com>,
Chandan Rajendra <chandan@linux.vnet.ibm.com>,
Reza Arbab <arbab@linux.ibm.com>
Subject: [v2 12/12] powerpc/64s: Save r13 in machine_check_common_early
Date: Tue, 2 Jul 2019 10:49:32 +0530 [thread overview]
Message-ID: <20190702051932.511-13-santosh@fossix.org> (raw)
In-Reply-To: <20190702051932.511-1-santosh@fossix.org>
From: Reza Arbab <arbab@linux.ibm.com>
Testing my memcpy_mcsafe() work in progress with an injected UE, I get
an error like this immediately after the function returns:
BUG: Unable to handle kernel data access at 0x7fff84dec8f8
Faulting instruction address: 0xc0080000009c00b0
Oops: Kernel access of bad area, sig: 11 [#1]
LE PAGE_SIZE=64K MMU=Radix MMU=Hash SMP NR_CPUS=2048 NUMA PowerNV
Modules linked in: mce(O+) vmx_crypto crc32c_vpmsum
CPU: 0 PID: 1375 Comm: modprobe Tainted: G O 5.1.0-rc6 #267
NIP: c0080000009c00b0 LR: c0080000009c00a8 CTR: c000000000095f90
REGS: c0000000ee197790 TRAP: 0300 Tainted: G O (5.1.0-rc6)
MSR: 900000000280b033 <SF,HV,VEC,VSX,EE,FP,ME,IR,DR,RI,LE> CR: 88002826 XER: 00040000
CFAR: c000000000095f8c DAR: 00007fff84dec8f8 DSISR: 40000000 IRQMASK: 0
GPR00: 000000006c6c6568 c0000000ee197a20 c0080000009c8400 fffffffffffffff2
GPR04: c0080000009c02e0 0000000000000006 0000000000000000 c000000003c834c8
GPR08: 0080000000000000 776a6681b7fb5100 0000000000000000 c0080000009c01c8
GPR12: c000000000095f90 00007fff84debc00 000000004d071440 0000000000000000
GPR16: 0000000100000601 c0080000009e0000 c000000000c98dd8 c000000000c98d98
GPR20: c000000003bba970 c0080000009c04d0 c0080000009c0618 c0000000001e5820
GPR24: 0000000000000000 0000000000000100 0000000000000001 c000000003bba958
GPR28: c0080000009c02e8 c0080000009c0318 c0080000009c02e0 0000000000000000
NIP [c0080000009c00b0] cause_ue+0xa8/0xe8 [mce]
LR [c0080000009c00a8] cause_ue+0xa0/0xe8 [mce]
To fix, ensure that r13 is properly restored after an MCE.
This commit is needed for testing this series, this is a possible simulator
bug.
---
arch/powerpc/kernel/exceptions-64s.S | 1 +
1 file changed, 1 insertion(+)
diff --git a/arch/powerpc/kernel/exceptions-64s.S b/arch/powerpc/kernel/exceptions-64s.S
index 311f1392a2ec..932d8d05892c 100644
--- a/arch/powerpc/kernel/exceptions-64s.S
+++ b/arch/powerpc/kernel/exceptions-64s.S
@@ -265,6 +265,7 @@ ALT_FTR_SECTION_END_IFSET(CPU_FTR_HVMODE)
EXC_REAL_END(machine_check, 0x200, 0x100)
EXC_VIRT_NONE(0x4200, 0x100)
TRAMP_REAL_BEGIN(machine_check_common_early)
+ SET_SCRATCH0(r13) /* save r13 */
EXCEPTION_PROLOG_1(PACA_EXMC, NOTEST, 0x200)
/*
* Register contents:
--
2.20.1
next prev parent reply other threads:[~2019-07-02 5:37 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-07-02 5:19 [v2 00/12] powerpc: implement machine check safe memcpy Santosh Sivaraj
2019-07-02 5:19 ` [v2 01/12] powerpc/mce: Make machine_check_ue_event() static Santosh Sivaraj
2019-07-02 5:19 ` [v2 02/12] powerpc/mce: Bug fixes for MCE handling in kernel space Santosh Sivaraj
2019-07-02 5:19 ` [v2 03/12] powerpc/mce: Add MCE notification chain Santosh Sivaraj
2019-07-02 14:55 ` Reza Arbab
2019-07-02 5:19 ` [v2 04/12] powerpc/mce: Move machine_check_ue_event() call Santosh Sivaraj
2019-07-02 5:19 ` [v2 05/12] powerpc/mce: Allow notifier callback to handle MCE Santosh Sivaraj
2019-07-02 5:19 ` [v2 06/12] powerpc/mce: Add fixup address to UE events Santosh Sivaraj
2019-07-02 5:19 ` [v2 07/12] powerpc/memcpy: Add memcpy_mcsafe for pmem Santosh Sivaraj
2019-07-02 5:19 ` [v2 08/12] powerpc/mce: Handle memcpy_mcsafe() Santosh Sivaraj
2019-07-02 5:19 ` [v2 09/12] powerpc/mce: Enable MCE notifiers in external modules Santosh Sivaraj
2019-07-02 6:17 ` Nicholas Piggin
2019-07-02 9:33 ` Mahesh Jagannath Salgaonkar
2019-07-03 17:20 ` Reza Arbab
2019-07-04 2:36 ` Nicholas Piggin
2019-07-05 2:50 ` Reza Arbab
2019-07-05 5:29 ` Nicholas Piggin
2019-07-08 15:23 ` Reza Arbab
2019-07-02 5:19 ` [v2 10/12] powerpc/memcpy_mcsafe: return remaining bytes Santosh Sivaraj
2019-07-02 5:19 ` [v2 11/12] powerpc: add machine check safe copy_to_user Santosh Sivaraj
2019-07-02 5:19 ` Santosh Sivaraj [this message]
2019-07-02 6:19 ` [v2 12/12] powerpc/64s: Save r13 in machine_check_common_early Nicholas Piggin
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