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Marc Zyngier cbdf8a189a arm64: Force SSBS on context switch 
On a CPU that doesn't support SSBS, PSTATE[12] is RES0.  In a system
where only some of the CPUs implement SSBS, we end-up losing track of
the SSBS bit across task migration.

To address this issue, let's force the SSBS bit on context switch.

Fixes: 8f04e8e6e29c ("arm64: ssbd: Add support for PSTATE.SSBS rather than trapping to EL3")
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
[will: inverted logic and added comments]
Signed-off-by: Will Deacon <will@kernel.org>
2019-07-22 15:24:16 +01:00
..
probes
arm64 updates for 5.3:
2019-07-08 09:54:55 -07:00
vdso
arm64: vdso: Cleanup Makefiles
2019-07-22 10:37:33 +01:00
vdso32
arm64: vdso: Cleanup Makefiles
2019-07-22 10:37:33 +01:00
.gitignore
…
acpi_numa.c
acpi: Create subtable parsing infrastructure
2019-04-04 18:41:12 +02:00
acpi_parking_protocol.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 234
2019-06-19 17:09:07 +02:00
acpi.c
arm64 updates for 5.3:
2019-07-08 09:54:55 -07:00
alternative.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 234
2019-06-19 17:09:07 +02:00
armv8_deprecated.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500
2019-06-19 17:09:55 +02:00
asm-offsets.c
arm64: vdso: Remove unnecessary asm-offsets.c definitions
2019-06-26 07:28:10 +02:00
cacheinfo.c
arm64 updates for 5.3:
2019-07-08 09:54:55 -07:00
cpu_errata.c
arm64: KVM: Propagate full Spectre v2 workaround state to KVM guests
2019-07-05 13:56:27 +01:00
cpu_ops.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 234
2019-06-19 17:09:07 +02:00
cpu-reset.h
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500
2019-06-19 17:09:55 +02:00
cpu-reset.S
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500
2019-06-19 17:09:55 +02:00
cpufeature.c
arm64 updates for 5.3:
2019-07-08 09:54:55 -07:00
cpuidle.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500
2019-06-19 17:09:55 +02:00
cpuinfo.c
arm64 updates for 5.3:
2019-07-08 09:54:55 -07:00
crash_core.c
arm64: kernel: arch_crash_save_vmcoreinfo() should depend on CONFIG_CRASH_CORE
2018-09-11 11:08:49 +01:00
crash_dump.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500
2019-06-19 17:09:55 +02:00
debug-monitors.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 234
2019-06-19 17:09:07 +02:00
efi-entry.S
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500
2019-06-19 17:09:55 +02:00
efi-header.S
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500
2019-06-19 17:09:55 +02:00
efi-rt-wrapper.S
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500
2019-06-19 17:09:55 +02:00
efi.c
mm/pgtable: drop pgtable_t variable from pte_fn_t functions
2019-07-12 11:05:46 -07:00
entry-fpsimd.S
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 234
2019-06-19 17:09:07 +02:00
entry-ftrace.S
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500
2019-06-19 17:09:55 +02:00
entry.S
arm64 updates for 5.3:
2019-07-08 09:54:55 -07:00
fpsimd.c
arm64/sve: Fix a couple of magic numbers for the Z-reg count
2019-07-22 11:49:03 +01:00
ftrace.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500
2019-06-19 17:09:55 +02:00
head.S
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 234
2019-06-19 17:09:07 +02:00
hibernate-asm.S
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 234
2019-06-19 17:09:07 +02:00
hibernate.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 194
2019-05-30 11:29:22 -07:00
hw_breakpoint.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 234
2019-06-19 17:09:07 +02:00
hyp-stub.S
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 234
2019-06-19 17:09:07 +02:00
image.h
arm64 fixes for 5.2
2019-07-03 15:57:30 +08:00
insn.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 234
2019-06-19 17:09:07 +02:00
io.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 234
2019-06-19 17:09:07 +02:00
irq.c
arm64 updates for 5.3:
2019-07-08 09:54:55 -07:00
jump_label.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 234
2019-06-19 17:09:07 +02:00
kaslr.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500
2019-06-19 17:09:55 +02:00
kexec_image.c
docs: arm64: convert docs to ReST and rename to .rst
2019-06-14 14:20:27 -06:00
kgdb.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 234
2019-06-19 17:09:07 +02:00
kuser32.S
docs: arm: convert docs to ReST and rename to *.rst
2019-07-15 09:20:24 -03:00
machine_kexec_file.c
arm64: kexec_file: handle empty command-line
2019-02-05 09:34:49 +00:00
machine_kexec.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500
2019-06-19 17:09:55 +02:00
Makefile
arm64: vdso: Enable vDSO compat support
2019-06-22 21:21:09 +02:00
module-plts.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500
2019-06-19 17:09:55 +02:00
module.c
arm64 updates for 5.3:
2019-07-08 09:54:55 -07:00
module.lds
arm64: ftrace: emit ftrace-mod.o contents through code
2017-12-01 13:04:59 +00:00
paravirt.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 174
2019-05-30 11:26:41 -07:00
pci.c
pci-v5.3-changes
2019-07-15 20:44:49 -07:00
perf_callchain.c
arm64: stacktrace: Factor out backtrace initialisation
2019-07-22 11:44:08 +01:00
perf_event.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 234
2019-06-19 17:09:07 +02:00
perf_regs.c
compat: Move compat_timespec/ timeval to compat_time.h
2018-04-19 13:29:54 +02:00
pointer_auth.c
arm64: ptr auth: Move per-thread keys from thread_info to thread_struct
2018-12-13 16:42:47 +00:00
process.c
arm64: Force SSBS on context switch
2019-07-22 15:24:16 +01:00
psci.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 174
2019-05-30 11:26:41 -07:00
ptrace.c
arm64 updates for 5.3:
2019-07-08 09:54:55 -07:00
reloc_test_core.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500
2019-06-19 17:09:55 +02:00
reloc_test_syms.S
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500
2019-06-19 17:09:55 +02:00
relocate_kernel.S
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500
2019-06-19 17:09:55 +02:00
return_address.c
arm64: stacktrace: Factor out backtrace initialisation
2019-07-22 11:44:08 +01:00
sdei.c
arm64: fix wrong check of on_sdei_stack in nmi context
2019-04-04 16:02:25 +01:00
setup.c
arm64: move jump_label_init() before parse_early_param()
2019-07-12 11:05:46 -07:00
signal32.c
arm64: compat: Get sigreturn trampolines from vDSO
2019-06-22 21:21:09 +02:00
signal.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 234
2019-06-19 17:09:07 +02:00
sigreturn32.S
arm64: compat: Split kuser32
2019-04-23 18:01:57 +01:00
sleep.S
arm64: kernel: use aff3 instead of aff2 in comment
2019-06-04 14:51:01 +01:00
smccc-call.S
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 174
2019-05-30 11:26:41 -07:00
smp_spin_table.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 234
2019-06-19 17:09:07 +02:00
smp.c
arm64: move jump_label_init() before parse_early_param()
2019-07-12 11:05:46 -07:00
ssbd.c
arm64: ssbd: explicitly depend on <linux/prctl.h>
2019-06-17 18:38:10 +01:00
stacktrace.c
arm64: stacktrace: Better handle corrupted stacks
2019-07-22 11:44:15 +01:00
suspend.c
arm64: mm: Support Common Not Private translations
2018-09-18 12:02:27 +01:00
sys32.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 452
2019-06-19 17:09:08 +02:00
sys_compat.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 234
2019-06-19 17:09:07 +02:00
sys.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 234
2019-06-19 17:09:07 +02:00
syscall.c
arm64: errata: Add workaround for Cortex-A76 erratum #1463225
2019-05-23 11:38:10 +01:00
time.c
arm64: stacktrace: Factor out backtrace initialisation
2019-07-22 11:44:08 +01:00
topology.c
arm64: topology: re-introduce numa mask check for scheduler MC selection
2018-07-06 13:18:18 +01:00
trace-events-emulation.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
traps.c
arm64: stacktrace: Factor out backtrace initialisation
2019-07-22 11:44:08 +01:00
vdso.c
arm64: compat: VDSO setup for compat layer
2019-06-22 21:21:08 +02:00
vmlinux.lds.S
arm64: relocatable: fix inconsistencies in linker script and options
2018-12-04 12:48:25 +00:00