linux/arch/powerpc
Nathan Fontenot 2c10636a0b powerpc/pseries: Check for zero filled ibm,dynamic-memory property
Some versions of QEMU will produce an ibm,dynamic-reconfiguration-memory
node with a ibm,dynamic-memory property that is zero-filled. This
causes the drmem code to oops trying to parse this property.

The fix for this is to validate that the property does contain LMB
entries before trying to parse it and bail if the count is zero.

  Oops: Kernel access of bad area, sig: 11 [#1]
  DAR: 0000000000000010
  NIP read_drconf_v1_cell+0x54/0x9c
  LR  read_drconf_v1_cell+0x48/0x9c
  Call Trace:
    __param_initcall_debug+0x0/0x28 (unreliable)
    drmem_init+0x144/0x2f8
    do_one_initcall+0x64/0x1d0
    kernel_init_freeable+0x298/0x38c
    kernel_init+0x24/0x160
    ret_from_kernel_thread+0x5c/0xb4

The ibm,dynamic-reconfiguration-memory device tree property generated
that causes this:

  ibm,dynamic-reconfiguration-memory {
          ibm,lmb-size = <0x0 0x10000000>;
          ibm,memory-flags-mask = <0xff>;
          ibm,dynamic-memory = <0x0 0x0 0x0 0x0 0x0 0x0>;
          linux,phandle = <0x7e57eed8>;
          ibm,associativity-lookup-arrays = <0x1 0x4 0x0 0x0 0x0 0x0>;
          ibm,memory-preservation-time = <0x0>;
  };

Signed-off-by: Nathan Fontenot <nfont@linux.vnet.ibm.com>
Reviewed-by: Cyril Bur <cyrilbur@gmail.com>
Tested-by: Daniel Black <daniel@linux.vnet.ibm.com>
[mpe: Trim oops report]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2018-02-16 21:34:14 +11:00
..
boot powerpc updates for 4.16 2018-02-02 10:01:04 -08:00
configs powerpc updates for 4.16 2018-02-02 10:01:04 -08:00
crypto crypto: hash - annotate algorithms taking optional key 2018-01-12 23:03:35 +11:00
include powerpc/pseries: Add empty update_numa_cpu_lookup_table() for NUMA=n 2018-02-15 10:10:02 +11:00
kernel powerpc: Expose TSCR via sysfs only on powernv 2018-02-15 09:54:42 +11:00
kvm KVM changes for 4.16 2018-02-10 13:16:35 -08:00
lib Merge branch 'fixes' into next 2018-01-21 23:21:14 +11:00
math-emu License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
mm powerpc/pseries: Check for zero filled ibm,dynamic-memory property 2018-02-16 21:34:14 +11:00
net bpf, ppc64: remove obsolete exception handling from div/mod 2018-01-26 16:42:06 -08:00
oprofile treewide: setup_timer() -> timer_setup() 2017-11-21 15:57:07 -08:00
perf Merge branch 'fixes' into next 2018-01-21 23:21:14 +11:00
platforms powerpc/powernv: IMC fix out of bounds memory access at shutdown 2018-02-15 09:54:45 +11:00
purgatory License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
sysdev powerpc/xive: Use hw CPU ids when configuring the CPU queues 2018-02-15 09:54:43 +11:00
tools License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
xmon powerpc/64s: Improve RFI L1-D cache flush fallback 2018-01-23 16:16:33 +11:00
Kconfig Merge branch 'linus' into sched/urgent, to resolve conflicts 2018-02-06 21:12:31 +01:00
Kconfig.debug powerpc: Add new kconfig CONFIG_PPC_IRQ_SOFT_MASK_DEBUG 2018-01-19 22:37:03 +11:00
Makefile powerpc/modules: Fix alignment of .toc section in kernel modules 2017-12-11 13:03:35 +11:00
Makefile.postlink License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00