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linux/arch/ia64/include/asm
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Hidetoshi Seto 07a6a4ae82 [IA64] kexec: Make INIT safe while transition to 
kdump/kexec kernel

Summary:

  Asserting INIT on the beginning of kdump/kexec kernel will result
  in unexpected behavior because INIT handler for previous kernel is
  invoked on new kernel.

Description:

  In panic situation, we can receive INIT while kernel transition,
  i.e. from beginning of panic to bootstrap of kdump kernel.
  Since we initialize registers on leave from current kernel, no
  longer monarch/slave handlers of current kernel in virtual mode are
  called safely.  (In fact system goes hang as far as I confirmed)

How to Reproduce:

  Start kdump
    # echo c > /proc/sysrq-trigger
  Then assert INIT while kdump kernel is booting, before new INIT
  handler for kdump kernel is registered.

Expected(Desirable) result:

  kdump kernel boots without any problem, crashdump retrieved

Actual result:

  INIT handler for previous kernel is invoked on kdump kernel
  => panic, hang etc. (unexpected)

Proposed fix:

  We can unregister these init handlers from SAL before jumping into
  new kernel, however then the INIT will fallback to default behavior,
  result in warmboot by SAL (according to the SAL specification) and
  we cannot retrieve the crashdump.

  Therefore this patch introduces a NOP init handler and register it
  to SAL before leave from current kernel, to start kdump safely by
  preventing INITs from entering virtual mode and resulting in warmboot.

  On the other hand, in case of kexec that not for kdump, it also
  has same problem with INIT while kernel transition.
  This patch handles this case differently, because for kexec
  unregistering handlers will be preferred than registering NOP
  handler, since the situation "no handlers registered" is usual
  state for kernel's entry.

Signed-off-by: Hidetoshi Seto <seto.hidetoshi@jp.fujitsu.com>
Cc: Vivek Goyal <vgoyal@redhat.com>
Cc: Haren Myneni <hbabu@us.ibm.com>
Cc: kexec@lists.infradead.org
Acked-by: Fenghua Yu <fenghua.yu@intel.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>
2009-09-14 16:18:02 -07:00
..
native ia64/pv_ops: paravirtualize gate.S. 2009-03-26 11:01:46 -07:00
sn [IA64] Convert ia64 to use int-ll64.h 2009-06-17 09:33:49 -07:00
uv sgi-gru: add macros for using the UV hub to send interrupts 2009-04-02 19:05:05 -07:00
xen Fix ia64 compilation IS_ERR and PTE_ERR errors. 2009-07-17 06:34:50 -07:00
acpi-ext.h ACPI: remove private acpica headers from driver files 2008-12-31 01:15:22 -05:00
acpi.h [IA64] Move include/asm-ia64 to arch/ia64/include/asm 2008-08-01 10:21:21 -07:00
agp.h [IA64] Move include/asm-ia64 to arch/ia64/include/asm 2008-08-01 10:21:21 -07:00
asmmacro.h [IA64] Move include/asm-ia64 to arch/ia64/include/asm 2008-08-01 10:21:21 -07:00
atomic.h asm-generic: rename atomic.h to atomic-long.h 2009-06-11 21:02:17 +02:00
auxvec.h [IA64] Move include/asm-ia64 to arch/ia64/include/asm 2008-08-01 10:21:21 -07:00
bitops.h ia64: boolean __test_and_clear_bit 2009-08-11 14:52:10 -07:00
bitsperlong.h asm-generic: introduce asm/bitsperlong.h 2009-06-11 21:02:14 +02:00
break.h ia64/xen: reserve "break" numbers used for xen hypercalls. 2008-10-17 09:52:52 -07:00
bug.h [IA64] Move include/asm-ia64 to arch/ia64/include/asm 2008-08-01 10:21:21 -07:00
bugs.h [IA64] Move include/asm-ia64 to arch/ia64/include/asm 2008-08-01 10:21:21 -07:00
byteorder.h byteorder: make swab.h include asm/swab.h like a regular header 2009-01-14 19:56:50 -08:00
cache.h [IA64] Move include/asm-ia64 to arch/ia64/include/asm 2008-08-01 10:21:21 -07:00
cacheflush.h [IA64] Add Variable Page Size and IA64 Support in Intel IOMMU 2008-10-17 12:14:13 -07:00
checksum.h [IA64] Move include/asm-ia64 to arch/ia64/include/asm 2008-08-01 10:21:21 -07:00
compat.h [IA64] Move include/asm-ia64 to arch/ia64/include/asm 2008-08-01 10:21:21 -07:00
cpu.h [IA64] Move include/asm-ia64 to arch/ia64/include/asm 2008-08-01 10:21:21 -07:00
cputime.h [IA64] Move include/asm-ia64 to arch/ia64/include/asm 2008-08-01 10:21:21 -07:00
current.h [IA64] Move include/asm-ia64 to arch/ia64/include/asm 2008-08-01 10:21:21 -07:00
cyclone.h [IA64] Move include/asm-ia64 to arch/ia64/include/asm 2008-08-01 10:21:21 -07:00
delay.h [IA64] Move include/asm-ia64 to arch/ia64/include/asm 2008-08-01 10:21:21 -07:00
device.h [IA64] Add Variable Page Size and IA64 Support in Intel IOMMU 2008-10-17 12:14:13 -07:00
div64.h [IA64] Move include/asm-ia64 to arch/ia64/include/asm 2008-08-01 10:21:21 -07:00
dma-mapping.h dma-mapping: ia64: add CONFIG_DMA_API_DEBUG support 2009-06-18 13:03:58 -07:00
dma.h [IA64] Move include/asm-ia64 to arch/ia64/include/asm 2008-08-01 10:21:21 -07:00
dmi.h [IA64] Move include/asm-ia64 to arch/ia64/include/asm 2008-08-01 10:21:21 -07:00
elf.h [PATCH] remove unused ibcs2/PER_SVR4 in SET_PERSONALITY 2008-10-16 15:40:05 +02:00
emergency-restart.h [IA64] Move include/asm-ia64 to arch/ia64/include/asm 2008-08-01 10:21:21 -07:00
errno.h [IA64] Move include/asm-ia64 to arch/ia64/include/asm 2008-08-01 10:21:21 -07:00
esi.h [IA64] Move include/asm-ia64 to arch/ia64/include/asm 2008-08-01 10:21:21 -07:00
fb.h [IA64] Move include/asm-ia64 to arch/ia64/include/asm 2008-08-01 10:21:21 -07:00
fcntl.h [IA64] Move include/asm-ia64 to arch/ia64/include/asm 2008-08-01 10:21:21 -07:00
fpswa.h [IA64] Move include/asm-ia64 to arch/ia64/include/asm 2008-08-01 10:21:21 -07:00
fpu.h Revert "Neither asm/types.h nor linux/types.h is required for arch/ia64/include/asm/fpu.h" 2009-07-17 06:35:05 -07:00
ftrace.h ftrace, ia64: IA64 dynamic ftrace support 2009-01-14 12:11:31 +01:00
futex.h [IA64] Move include/asm-ia64 to arch/ia64/include/asm 2008-08-01 10:21:21 -07:00
gcc_intrin.h [IA64] Convert ia64 to use int-ll64.h 2009-06-17 09:33:49 -07:00
hardirq.h preempt-count: force hardirq-count to max of 10 2009-02-12 11:19:05 -05:00
hpsim.h [IA64] Move include/asm-ia64 to arch/ia64/include/asm 2008-08-01 10:21:21 -07:00
hugetlb.h [IA64] Move include/asm-ia64 to arch/ia64/include/asm 2008-08-01 10:21:21 -07:00
hw_irq.h [IA64] remove obsolete hw_interrupt_type 2009-06-15 14:35:10 -07:00
ia32.h [IA64] Move include/asm-ia64 to arch/ia64/include/asm 2008-08-01 10:21:21 -07:00
ia64regs.h [IA64] Move include/asm-ia64 to arch/ia64/include/asm 2008-08-01 10:21:21 -07:00
idle.h [IA64] xen_domu_defconfig: fix build issues/warnings 2009-05-05 11:43:13 -07:00
intel_intrin.h [IA64] Move include/asm-ia64 to arch/ia64/include/asm 2008-08-01 10:21:21 -07:00
intrinsics.h Pull pvops into release branch 2009-03-31 14:25:08 -07:00
io.h [IA64] remove dead BIO_VMERGE_BOUNDARY definition 2008-11-04 11:31:58 -08:00
ioctl.h [IA64] Move include/asm-ia64 to arch/ia64/include/asm 2008-08-01 10:21:21 -07:00
ioctls.h [IA64] Move include/asm-ia64 to arch/ia64/include/asm 2008-08-01 10:21:21 -07:00
iommu.h intel-iommu: Fix one last ia64 build problem in Pass Through Support 2009-06-05 20:49:53 +01:00
iosapic.h [IA64] Move include/asm-ia64 to arch/ia64/include/asm 2008-08-01 10:21:21 -07:00
ipcbuf.h [IA64] Move include/asm-ia64 to arch/ia64/include/asm 2008-08-01 10:21:21 -07:00
irq_regs.h [IA64] Move include/asm-ia64 to arch/ia64/include/asm 2008-08-01 10:21:21 -07:00
irq.h ia64: cpumask fix for is_affinity_mask_valid() 2009-01-04 15:39:24 +01:00
Kbuild [IA64] unexport fpswa.h 2009-06-15 14:32:54 -07:00
kdebug.h [IA64] Move include/asm-ia64 to arch/ia64/include/asm 2008-08-01 10:21:21 -07:00
kexec.h kexec jump: rename KEXEC_CONTROL_CODE_SIZE to KEXEC_CONTROL_PAGE_SIZE 2008-08-15 08:35:42 -07:00
kmap_types.h kmap_types: make most arches use generic header file 2009-06-16 19:47:51 -07:00
kprobes.h [IA64] Move include/asm-ia64 to arch/ia64/include/asm 2008-08-01 10:21:21 -07:00
kregs.h [IA64] Fix annoying IA64_TR_ALLOC_MAX message. 2008-10-17 13:47:53 -07:00
kvm_host.h KVM: Enable snooping control for supported hardware 2009-06-10 11:48:50 +03:00
kvm_para.h [IA64] Move include/asm-ia64 to arch/ia64/include/asm 2008-08-01 10:21:21 -07:00
kvm.h Merge branch 'header-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip 2009-03-26 16:11:41 -07:00
libata-portmap.h [IA64] Move include/asm-ia64 to arch/ia64/include/asm 2008-08-01 10:21:21 -07:00
linkage.h [IA64] Move include/asm-ia64 to arch/ia64/include/asm 2008-08-01 10:21:21 -07:00
local.h [IA64] Move include/asm-ia64 to arch/ia64/include/asm 2008-08-01 10:21:21 -07:00
machvec_dig_vtd.h remove dma operations in struct ia64_machine_vector 2009-01-06 14:06:50 +01:00
machvec_dig.h [IA64] Move include/asm-ia64 to arch/ia64/include/asm 2008-08-01 10:21:21 -07:00
machvec_hpsim.h [IA64] Move include/asm-ia64 to arch/ia64/include/asm 2008-08-01 10:21:21 -07:00
machvec_hpzx1_swiotlb.h remove hwsw_dma_ops 2009-01-06 14:06:52 +01:00
machvec_hpzx1.h remove dma operations in struct ia64_machine_vector 2009-01-06 14:06:50 +01:00
machvec_init.h [IA64] SN specific version of dma_get_required_mask() 2009-01-15 10:42:16 -08:00
machvec_sn2.h Merge branch 'linus' into core/iommu 2009-01-16 10:09:10 +01:00
machvec_uv.h [IA64] Move include/asm-ia64 to arch/ia64/include/asm 2008-08-01 10:21:21 -07:00
machvec_xen.h ia64/xen: define xen machine vector for domU. 2008-10-17 10:08:56 -07:00
machvec.h Merge branch 'linus' into core/iommu 2009-01-16 10:09:10 +01:00
mc146818rtc.h [IA64] Move include/asm-ia64 to arch/ia64/include/asm 2008-08-01 10:21:21 -07:00
mca_asm.h [IA64] Move include/asm-ia64 to arch/ia64/include/asm 2008-08-01 10:21:21 -07:00
mca.h [IA64] kexec: Make INIT safe while transition to 2009-09-14 16:18:02 -07:00
meminit.h [IA64] Convert ia64 to use int-ll64.h 2009-06-17 09:33:49 -07:00
mman.h asm-generic: rename termios.h, signal.h and mman.h 2009-06-11 21:01:52 +02:00
mmu_context.h cpumask: use mm_cpumask() wrapper: ia64 2009-03-16 14:12:48 +10:30
mmu.h [IA64] Move include/asm-ia64 to arch/ia64/include/asm 2008-08-01 10:21:21 -07:00
mmzone.h mm: clean up for early_pfn_to_nid() 2009-02-18 15:37:55 -08:00
module.h ia64/pv_ops/bp/module: support binary patching for kernel module. 2009-03-26 11:02:51 -07:00
msgbuf.h [IA64] Move include/asm-ia64 to arch/ia64/include/asm 2008-08-01 10:21:21 -07:00
msidef.h ia64: Move the macro definitions related to MSI to one header file. 2009-03-24 11:03:12 +02:00
mutex.h [IA64] Move include/asm-ia64 to arch/ia64/include/asm 2008-08-01 10:21:21 -07:00
nodedata.h [IA64] Move include/asm-ia64 to arch/ia64/include/asm 2008-08-01 10:21:21 -07:00
numa.h [IA64] Move include/asm-ia64 to arch/ia64/include/asm 2008-08-01 10:21:21 -07:00
page.h [IA64] Move include/asm-ia64 to arch/ia64/include/asm 2008-08-01 10:21:21 -07:00
pal.h [IA64] Convert ia64 to use int-ll64.h 2009-06-17 09:33:49 -07:00
param.h [IA64] Move include/asm-ia64 to arch/ia64/include/asm 2008-08-01 10:21:21 -07:00
paravirt_patch.h ia64/pv_op/binarypatch: add helper functions to support binary patching for paravirt_ops. 2009-03-26 11:02:31 -07:00
paravirt_privop.h [IA64] fix allmodconfig compilation breakage. 2009-04-20 09:46:29 -07:00
paravirt.h ia64/pv_ops: implement binary patching optimization for native. 2009-03-26 11:02:42 -07:00
parport.h [IA64] Move include/asm-ia64 to arch/ia64/include/asm 2008-08-01 10:21:21 -07:00
patch.h [IA64] Move include/asm-ia64 to arch/ia64/include/asm 2008-08-01 10:21:21 -07:00
pci.h Delete pcibios_select_root 2009-06-17 14:04:42 -07:00
percpu.h percpu: make PER_CPU_BASE_SECTION overridable by arches 2009-02-09 10:30:29 +01:00
perfmon_default_smpl.h [IA64] Move include/asm-ia64 to arch/ia64/include/asm 2008-08-01 10:21:21 -07:00
perfmon.h [IA64] Move include/asm-ia64 to arch/ia64/include/asm 2008-08-01 10:21:21 -07:00
pgalloc.h mm: Pass virtual address to [__]p{te,ud,md}_free_tlb() 2009-07-27 12:10:38 -07:00
pgtable.h IA64: includecheck fix: ia64, pgtable.h 2009-08-11 14:52:11 -07:00
poll.h [IA64] Move include/asm-ia64 to arch/ia64/include/asm 2008-08-01 10:21:21 -07:00
posix_types.h [IA64] Move include/asm-ia64 to arch/ia64/include/asm 2008-08-01 10:21:21 -07:00
processor.h [IA64] Convert ia64 to use int-ll64.h 2009-06-17 09:33:49 -07:00
ptrace_offsets.h [IA64] Move include/asm-ia64 to arch/ia64/include/asm 2008-08-01 10:21:21 -07:00
ptrace.h remove __ARCH_WANT_COMPAT_SYS_PTRACE 2008-11-30 11:00:15 -08:00
pvclock-abi.h ia64/xen: add a necessary header file to compile include/xen/interface/xen.h 2008-10-17 09:57:28 -07:00
resource.h [IA64] Move include/asm-ia64 to arch/ia64/include/asm 2008-08-01 10:21:21 -07:00
rse.h [IA64] Move include/asm-ia64 to arch/ia64/include/asm 2008-08-01 10:21:21 -07:00
rwsem.h [IA64] Move include/asm-ia64 to arch/ia64/include/asm 2008-08-01 10:21:21 -07:00
sal.h [IA64] Convert ia64 to use int-ll64.h 2009-06-17 09:33:49 -07:00
scatterlist.h [IA64] Move include/asm-ia64 to arch/ia64/include/asm 2008-08-01 10:21:21 -07:00
sections.h [IA64] Put the space for cpu0 per-cpu area into .data section 2008-09-29 16:39:19 -07:00
segment.h [IA64] Move include/asm-ia64 to arch/ia64/include/asm 2008-08-01 10:21:21 -07:00
sembuf.h [IA64] Move include/asm-ia64 to arch/ia64/include/asm 2008-08-01 10:21:21 -07:00
serial.h [IA64] Move include/asm-ia64 to arch/ia64/include/asm 2008-08-01 10:21:21 -07:00
setup.h [IA64] Move include/asm-ia64 to arch/ia64/include/asm 2008-08-01 10:21:21 -07:00
shmbuf.h [IA64] Move include/asm-ia64 to arch/ia64/include/asm 2008-08-01 10:21:21 -07:00
shmparam.h [IA64] Move include/asm-ia64 to arch/ia64/include/asm 2008-08-01 10:21:21 -07:00
sigcontext.h [IA64] Move include/asm-ia64 to arch/ia64/include/asm 2008-08-01 10:21:21 -07:00
siginfo.h signals: demultiplexing SIGTRAP signal 2008-09-23 13:26:52 +02:00
signal.h asm-generic: rename termios.h, signal.h and mman.h 2009-06-11 21:01:52 +02:00
smp.h FRV: Fix the section attribute on UP DECLARE_PER_CPU() 2009-04-21 19:39:59 -07:00
socket.h net: new user space API for time stamping of incoming and outgoing packets 2009-02-15 22:43:33 -08:00
sockios.h [IA64] Move include/asm-ia64 to arch/ia64/include/asm 2008-08-01 10:21:21 -07:00
sparsemem.h [IA64] Move include/asm-ia64 to arch/ia64/include/asm 2008-08-01 10:21:21 -07:00
spinlock_types.h [IA64] Move include/asm-ia64 to arch/ia64/include/asm 2008-08-01 10:21:21 -07:00
spinlock.h ia64: implement interrupt-enabling rwlocks 2009-04-02 19:05:11 -07:00
stat.h [IA64] Move include/asm-ia64 to arch/ia64/include/asm 2008-08-01 10:21:21 -07:00
statfs.h IA64: Use <asm-generic/statfs.h> 2008-09-04 09:46:13 +01:00
string.h [IA64] Move include/asm-ia64 to arch/ia64/include/asm 2008-08-01 10:21:21 -07:00
swab.h headers_check fix: ia64, swab.h 2009-02-01 11:01:25 +05:30
swiotlb.h swiotlb: replace architecture-specific swiotlb.h with linux/swiotlb.h 2008-12-28 10:04:00 +01:00
sync_bitops.h ia64/xen: introduce sync bitops which is necessary for ia64/xen support. 2008-10-17 09:53:33 -07:00
syscall.h [IA64] utrace Convert compat ptrace to use compat_sys_ptrace 2008-10-06 10:45:29 -07:00
system.h [IA64] Move include/asm-ia64 to arch/ia64/include/asm 2008-08-01 10:21:21 -07:00
termbits.h [IA64] Move include/asm-ia64 to arch/ia64/include/asm 2008-08-01 10:21:21 -07:00
termios.h [IA64] Move include/asm-ia64 to arch/ia64/include/asm 2008-08-01 10:21:21 -07:00
thread_info.h sched: INIT_PREEMPT_COUNT 2009-07-10 14:24:05 -07:00
timex.h ia64/pv_ops/pv_time_ops: add sched_clock hook. 2009-03-26 10:50:42 -07:00
tlb.h mm: Pass virtual address to [__]p{te,ud,md}_free_tlb() 2009-07-27 12:10:38 -07:00
tlbflush.h [IA64] Move include/asm-ia64 to arch/ia64/include/asm 2008-08-01 10:21:21 -07:00
topology.h Pull cpumask into release branch 2009-03-31 14:24:52 -07:00
types.h [IA64] Convert ia64 to use int-ll64.h 2009-06-17 09:33:49 -07:00
uaccess.h [IA64] Move include/asm-ia64 to arch/ia64/include/asm 2008-08-01 10:21:21 -07:00
ucontext.h [IA64] Move include/asm-ia64 to arch/ia64/include/asm 2008-08-01 10:21:21 -07:00
unaligned.h [IA64] Move include/asm-ia64 to arch/ia64/include/asm 2008-08-01 10:21:21 -07:00
uncached.h [IA64] Move include/asm-ia64 to arch/ia64/include/asm 2008-08-01 10:21:21 -07:00
unistd.h [IA64] ia64 does not need umount2() syscall 2009-06-16 13:13:50 -07:00
unwind.h [IA64] Move include/asm-ia64 to arch/ia64/include/asm 2008-08-01 10:21:21 -07:00
user.h [IA64] Move include/asm-ia64 to arch/ia64/include/asm 2008-08-01 10:21:21 -07:00
ustack.h [IA64] Move include/asm-ia64 to arch/ia64/include/asm 2008-08-01 10:21:21 -07:00
vga.h [IA64] Move include/asm-ia64 to arch/ia64/include/asm 2008-08-01 10:21:21 -07:00
xor.h [IA64] Move include/asm-ia64 to arch/ia64/include/asm 2008-08-01 10:21:21 -07:00