Sam Bobroff 0aab374709 powerpc/powernv: Restore non-volatile CRs after nap ... Patches 7cba160ad "powernv/cpuidle: Redesign idle states management" and 77b54e9f2 "powernv/powerpc: Add winkle support for offline cpus" use non-volatile condition registers (cr2, cr3 and cr4) early in the system reset interrupt handler (system_reset_pSeries()) before it has been determined if state loss has occurred. If state loss has not occurred, control returns via the power7_wakeup_noloss() path which does not restore those condition registers, leaving them corrupted. Fix this by restoring the condition registers in the power7_wakeup_noloss() case. This is apparent when running a KVM guest on hardware that does not support winkle or sleep and the guest makes use of secondary threads. In practice this means Power7 machines, though some early unreleased Power8 machines may also be susceptible. The secondary CPUs are taken off line before the guest is started and they call pnv_smp_cpu_kill_self(). This checks support for sleep states (in this case there is no support) and power7_nap() is called. When the CPU is woken, power7_nap() returns and because the CPU is still off line, the main while loop executes again. The sleep states support test is executed again, but because the tested values cannot have changed, the compiler has optimized the test away and instead we rely on the result of the first test, which has been left in cr3 and/or cr4. With the result overwritten, the wrong branch is taken and power7_winkle() is called on a CPU that does not support it, leading to it stalling. Fixes: 7cba160ad7 ("powernv/cpuidle: Redesign idle states management") Fixes: 77b54e9f21 ("powernv/powerpc: Add winkle support for offline cpus") [mpe: Massage change log a bit more] Signed-off-by: Sam Bobroff <sam.bobroff@au1.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>		2015-05-01 16:55:11 +10:00
..
vdso32	powerpc: 32 bit getcpu VDSO function uses 64 bit instructions	2014-11-27 09:42:12 +11:00
vdso64
.gitignore
align.c	powerpc: Remove double braces in alignment code.	2014-11-10 09:59:32 +11:00
asm-offsets.c	KVM: PPC: Book3S HV: Use msgsnd for signalling threads on POWER8	2015-04-21 15:21:34 +02:00
audit.c
btext.c
cacheinfo.c	powerpc: Fix missing L2 cache size in /sys/devices/system/cpu	2015-04-11 20:49:28 +10:00
cacheinfo.h
compat_audit.c
cpu_setup_6xx.S
cpu_setup_44x.S
cpu_setup_fsl_booke.S
cpu_setup_pa6t.S
cpu_setup_power.S	powerpc/book3s: Fix flush_tlb cpu_spec hook to take a generic argument.	2015-03-17 07:52:48 +11:00
cpu_setup_ppc970.S
cputable.c	powerpc updates for 4.1	2015-04-16 13:53:32 -05:00
crash_dump.c	powerpc: Remove superfluous bootmem includes	2014-11-10 09:59:26 +11:00
crash.c
dbell.c	powerpc/powernv: Fixes for hypervisor doorbell handling	2015-03-20 14:51:53 +11:00
dma-iommu.c	powerpc/iommu: Rename iommu_[un]map_sg functions	2014-11-18 11:30:01 +01:00
dma-swiotlb.c	powerpc: fsl_pci, swiotlb: Move controller ops from ppc_md to controller_ops	2015-04-11 20:49:17 +10:00
dma.c	powerpc: Only do dynamic DMA zone limits on platforms that need it	2014-10-17 09:21:44 +11:00
eeh_cache.c	powerpc/eeh: Remove device_node dependency	2015-03-24 13:15:53 +11:00
eeh_dev.c	powerpc/eeh: Create eeh_dev from pci_dn instead of device_node	2015-03-24 13:15:51 +11:00
eeh_driver.c	powerpc/eeh: Remove device_node dependency	2015-03-24 13:15:53 +11:00
eeh_event.c
eeh_pe.c	powerpc/eeh: Fix PE#0 check in eeh_add_to_parent_pe()	2015-03-31 13:10:39 +11:00
eeh_sysfs.c	powerpc/eeh: Fix PE state format	2014-11-27 09:32:58 +11:00
eeh.c	powerpc/eeh: Delay probing EEH device during hotplug	2015-05-01 13:52:32 +10:00
entry_32.S	powerpc: Remove old compile time disabled syscall tracing code	2015-02-02 14:51:32 +11:00
entry_64.S	Revert "powerpc/tm: Abort syscalls in active transactions"	2015-04-30 15:24:58 +10:00
epapr_hcalls.S
epapr_paravirt.c
exceptions-64e.S
exceptions-64s.S	powerpc/book3s: Fix the MCE code to use CONFIG_KVM_BOOK3S_64_HANDLER	2015-03-23 17:10:47 +11:00
fadump.c	powerpc/fadump: Fix endianess issues in firmware assisted dump handling	2014-10-30 16:52:46 +11:00
firmware.c
fpu.S
fsl_booke_entry_mapping.S
ftrace.c	powerpc updates for 3.19	2014-12-11 17:48:14 -08:00
head_8xx.S	powerpc/8xx: Remove duplicated code in set_context()	2015-01-29 21:59:02 -06:00
head_32.S
head_40x.S
head_44x.S
head_64.S
head_booke.h
head_fsl_booke.S
hw_breakpoint.c	powerpc: Replace __get_cpu_var uses	2014-11-03 12:12:32 +11:00
ibmebus.c
idle_6xx.S
idle_book3e.S
idle_e500.S
idle_power4.S
idle_power7.S	powerpc/powernv: Restore non-volatile CRs after nap	2015-05-01 16:55:11 +10:00
idle.c
io-workarounds.c	powerpc/mm/thp: Make page table walk safe against thp split/collapse	2015-04-17 11:23:39 +10:00
io.c
iomap.c
iommu.c	powerpc/iommu: Remove IOMMU device references via bus notifier	2015-03-04 13:19:33 +11:00
irq.c	powerpc: Remove superfluous bootmem includes	2014-11-10 09:59:26 +11:00
isa-bridge.c
jump_label.c
kgdb.c	powerpc: Replace __get_cpu_var uses	2014-11-03 12:12:32 +11:00
kprobes.c	powerpc: Replace __get_cpu_var uses	2014-11-03 12:12:32 +11:00
kvm_emul.S
kvm.c
l2cr_6xx.S
legacy_serial.c
machine_kexec_32.c
machine_kexec_64.c	kexec: add IND_FLAGS macro	2015-02-17 14:34:51 -08:00
machine_kexec.c
Makefile	powerpc: kill PPC_OF	2015-03-17 20:04:32 +11:00
mce_power.c	powerpc/book3s: Fix flush_tlb cpu_spec hook to take a generic argument.	2015-03-17 07:52:48 +11:00
mce.c	powerpc: Replace __get_cpu_var uses	2014-11-03 12:12:32 +11:00
misc_32.S
misc_64.S
misc.S	powerpc: Rename __get_SP() to current_stack_pointer()	2014-10-15 11:23:20 +11:00
module_32.c
module_64.c
module.c
msi.c
nvram_64.c	powerpc/rtas: Make timestamp related code y2038-safe	2015-03-23 14:06:11 +11:00
of_platform.c	powerpc/eeh: Do probe on pci_dn	2015-03-24 13:15:52 +11:00
paca.c	powerpc/kernel: Avoid memory corruption at early stage	2015-01-23 14:02:52 +11:00
pci_32.c	powerpc: Remove more traces of bootmem	2014-11-19 21:41:51 +11:00
pci_64.c	powerpc updates for 3.19	2014-12-11 17:48:14 -08:00
pci_dn.c	powerpc/powernv: Shift VF resource with an offset	2015-03-31 13:02:38 +11:00
pci_of_scan.c	powerpc: Remove shims for pci_controller_ops operations	2015-04-11 20:49:18 +10:00
pci-common.c	Merge branch 'next-sriov' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc into next	2015-04-14 09:29:23 +10:00
pci-hotplug.c	powerpc: Remove shims for pci_controller_ops operations	2015-04-11 20:49:18 +10:00
pmc.c
ppc32.h
ppc_ksyms_32.c
ppc_ksyms.c	powerpc: Rename __get_SP() to current_stack_pointer()	2014-10-15 11:23:20 +11:00
ppc_save_regs.S
proc_powerpc.c
process.c	powerpc/kernel: Rename copy_thread() 'arg' argument to 'kthread_arg'	2015-03-20 12:41:15 +11:00
prom_init_check.sh
prom_init.c	powerpc: Reword the "returning from prom_init" message	2015-04-10 20:02:48 +10:00
prom_parse.c
prom.c	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial	2015-04-14 09:50:27 -07:00
ptrace32.c
ptrace.c	Merge git://git.infradead.org/users/eparis/audit	2014-10-19 16:25:56 -07:00
reloc_32.S
reloc_64.S
rtas_flash.c
rtas_pci.c	powerpc: move find_and_init_phbs() to pSeries specific code	2015-04-11 20:49:09 +10:00
rtas-proc.c	powerpc: LLVM complains about forward declaration of struct rtas_sensors	2014-11-10 09:59:32 +11:00
rtas-rtc.c
rtas.c	powerpc: Replace mem_init_done with slab_is_available()	2015-04-10 20:02:48 +10:00
rtasd.c
setup_32.c	powerpc: Remove unused vgacon_remap_base & fix build break	2014-11-10 09:59:31 +11:00
setup_64.c	powerpc updates for 4.1	2015-04-16 13:53:32 -05:00
setup-common.c	powerpc: Convert power off logic to pm_power_off	2014-11-03 12:12:51 +11:00
signal_32.c	all arches, signal: move restart_block to struct task_struct	2015-02-12 18:54:12 -08:00
signal_64.c	all arches, signal: move restart_block to struct task_struct	2015-02-12 18:54:12 -08:00
signal.c
signal.h
smp-tbsync.c
smp.c	powerpc/smp: Wait until secondaries are active & online	2015-03-04 13:19:33 +11:00
stacktrace.c	powerpc: Rename __get_SP() to current_stack_pointer()	2014-10-15 11:23:20 +11:00
suspend.c
swsusp_32.S
swsusp_64.c
swsusp_asm64.S
swsusp_booke.S
swsusp.c
sys_ppc32.c
syscalls.c	powerpc: Add a proper syscall for switching endianness	2015-03-28 22:03:40 +11:00
sysfs.c	powerpc: Replace __get_cpu_var uses	2014-11-03 12:12:32 +11:00
systbl_chk.c	powerpc: Add a proper syscall for switching endianness	2015-03-28 22:03:40 +11:00
systbl_chk.sh
systbl.S	powerpc: Add a proper syscall for switching endianness	2015-03-28 22:03:40 +11:00
tau_6xx.c
time.c	KVM: PPC: Book3S HV: Accumulate timing information for real-mode code	2015-04-21 15:21:31 +02:00
tm.S	powerpc: Change vrX register defines to vX to match gcc and glibc	2015-03-16 18:32:11 +11:00
traps.c	powerpc: Remove some unused functions	2015-01-28 15:00:24 +11:00
udbg_16550.c	powerpc: Fix bad NULL pointer check in udbg_uart_getc_poll()	2014-11-12 13:47:20 +11:00
udbg.c	powerpc: Remove the celleb support	2015-04-07 17:15:13 +10:00
uprobes.c
vdso.c	powerpc: Remove superfluous bootmem includes	2014-11-10 09:59:26 +11:00
vecemu.c
vector.S	powerpc: Change vrX register defines to vX to match gcc and glibc	2015-03-16 18:32:11 +11:00
vio.c
vmlinux.lds.S