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linux/arch/arm64/kernel
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Marc Zyngier 0f80cad312 arm64: Restrict ARM64_ERRATUM_1188873 mitigation to AArch32 
We currently deal with ARM64_ERRATUM_1188873 by always trapping EL0
accesses for both instruction sets. Although nothing wrong comes out
of that, people trying to squeeze the last drop of performance from
buggy HW find this over the top. Oh well.

Let's change the mitigation by flipping the counter enable bit
on return to userspace. Non-broken HW gets an extra branch on
the fast path, which is hopefully not the end of the world.
The arch timer workaround is also removed.

Acked-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
2019-04-30 14:45:53 +01:00
..
probes arm64: kprobes: Use arch_populate_kprobe_blacklist() 2019-03-19 12:47:44 +00:00
vdso arm64: Add build salt to the vDSO 2018-07-18 01:18:05 +09:00
.gitignore
acpi.c arm64: KVM/mm: Move SEA handling behind a single 'claim' interface 2019-02-07 23:10:45 +01:00
acpi_numa.c mm: remove include/linux/bootmem.h 2018-10-31 08:54:16 -07:00
acpi_parking_protocol.c
alternative.c arm64: alternative: Apply alternatives early in boot process 2019-02-06 10:05:20 +00:00
armv8_deprecated.c Remove 'type' argument from access_ok() function 2019-01-03 18:57:57 -08:00
asm-offsets.c arm64: Make PMR part of task context 2019-02-06 10:05:18 +00:00
cacheinfo.c
cpu-reset.h arm64: kexec: always reset to EL2 if present 2018-07-04 18:34:24 +01:00
cpu-reset.S arm64: kexec_file: invoke the kernel without purgatory 2018-12-06 14:38:53 +00:00
cpu_errata.c arm64: kpti: Avoid rewriting early page tables when KASLR is enabled 2019-01-10 17:49:35 +00:00
cpu_ops.c
cpufeature.c arm64: kpti: Whitelist HiSilicon Taishan v110 CPUs 2019-03-19 14:55:10 +00:00
cpuidle.c
cpuinfo.c arm64: add basic pointer authentication support 2018-12-13 16:42:46 +00:00
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 arm64: kdump: fix small typo 2018-11-02 17:24:17 +00:00
debug-monitors.c signal/arm64: Add and use arm64_force_sig_fault where appropriate 2018-09-27 21:54:43 +02:00
efi-entry.S
efi-header.S
efi-rt-wrapper.S
efi.c
entry-fpsimd.S
entry-ftrace.S arm64: frace: use asm EXPORT_SYMBOL() 2018-12-10 11:50:12 +00:00
entry.S arm64: Restrict ARM64_ERRATUM_1188873 mitigation to AArch32 2019-04-30 14:45:53 +01:00
fpsimd.c signal/arm64: Use send_sig_fault where appropriate 2018-09-27 21:55:23 +02:00
ftrace.c Tracing changes for v4.21: 2018-12-31 11:46:59 -08:00
head.S arm64: Relax GIC version check during early boot 2019-02-20 14:05:37 +00:00
hibernate-asm.S arm64: mm: Offset TTBR1 to allow 52-bit PTRS_PER_PGD 2018-12-10 18:42:17 +00:00
hibernate.c arm64: hibernate: Clean the __hyp_text to PoC after resume 2019-02-01 14:10:02 +00:00
hw_breakpoint.c
hyp-stub.S arm64: hyp-stub: Forbid kprobing of the hyp-stub 2019-02-01 14:10:01 +00:00
image.h Merge branch 'for-next/kexec' into aarch64/for-next/core 2018-12-10 18:57:17 +00:00
insn.c arm64/insn: add support for emitting ADR/ADRP instructions 2018-11-27 18:47:33 +00:00
io.c
irq.c arm64: Fix HCR.TGE status for NMI contexts 2019-02-06 10:05:16 +00:00
jump_label.c jump_label: move 'asm goto' support test to Kconfig 2019-01-06 09:46:51 +09:00
kaslr.c arm64: kaslr: ensure randomized quantities are clean also when kaslr is off 2019-02-01 14:07:23 +00:00
kexec_image.c arm64: kexec_file: forbid kdump via kexec_file_load() 2018-12-07 15:28:21 +00:00
kgdb.c arm64: debug: Ensure debug handlers check triggering exception level 2019-03-01 16:23:38 +00:00
kuser32.S
machine_kexec.c arm64: kdump: no need to mark crashkernel pages manually PG_reserved 2019-03-05 21:07:19 -08:00
machine_kexec_file.c arm64: kexec_file: handle empty command-line 2019-02-05 09:34:49 +00:00
Makefile arm64: replace arm64-obj-* in Makefile with obj-* 2019-01-04 10:09:21 +00:00
module-plts.c arm64/module: switch to ADRP/ADD sequences for PLT entries 2018-11-27 19:00:45 +00:00
module.c arm64/module: switch to ADRP/ADD sequences for PLT entries 2018-11-27 19:00:45 +00:00
module.lds
paravirt.c x86/paravirt: Use a single ops structure 2018-09-03 16:50:35 +02:00
pci.c arm64: PCI: Remove node-local allocations when initialising host controller 2018-09-17 16:33:23 -05:00
perf_callchain.c Remove 'type' argument from access_ok() function 2019-01-03 18:57:57 -08:00
perf_event.c arm64: perf: remove misleading comment 2019-01-19 22:57:38 +00:00
perf_regs.c
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: Unmask PMR before going idle 2019-02-06 10:05:18 +00:00
psci.c arm64: remove unused asm/compiler.h header file 2018-10-01 11:57:04 +01:00
ptrace.c arm64 updates for 5.1: 2019-03-10 10:17:23 -07:00
reloc_test_core.c
reloc_test_syms.S
relocate_kernel.S arm64: kexec_file: invoke the kernel without purgatory 2018-12-06 14:38:53 +00:00
return_address.c arm64: Use ftrace_graph_get_ret_stack() instead of curr_ret_stack 2018-12-22 08:21:02 -05:00
sdei.c arm64: sdei: Mark sdei stack helper functions as static 2018-07-31 12:08:22 +01:00
setup.c arm64: replace memblock_alloc_low with memblock_alloc 2019-03-27 18:12:41 +00:00
signal.c Remove 'type' argument from access_ok() function 2019-01-03 18:57:57 -08:00
signal32.c Remove 'type' argument from access_ok() function 2019-01-03 18:57:57 -08:00
sleep.S arm64/mm: Pass ttbr1 as a parameter to __enable_mmu() 2018-09-25 15:10:54 +01:00
smccc-call.S arm64: smccc: use asm EXPORT_SYMBOL() 2018-12-10 11:50:11 +00:00
smp.c arm64: Switch to PMR masking when starting CPUs 2019-02-06 10:05:20 +00:00
smp_spin_table.c
ssbd.c arm64: ssbd: Add support for PSTATE.SSBS rather than trapping to EL3 2018-09-14 17:46:19 +01:00
stacktrace.c arm64/stacktrace: Export save_stack_trace_regs() 2019-03-19 14:55:10 +00:00
suspend.c arm64: mm: Support Common Not Private translations 2018-09-18 12:02:27 +01:00
sys.c arm64: implement syscall wrappers 2018-07-12 14:49:48 +01:00
sys32.c arm64: implement syscall wrappers 2018-07-12 14:49:48 +01:00
sys_compat.c arm64 fixes for -rc1 2019-01-05 11:28:39 -08:00
syscall.c arm64: compat: Don't pull syscall number from regs in arm_compat_syscall 2019-01-04 14:18:01 +00:00
time.c arm64: Use ftrace_graph_get_ret_stack() instead of curr_ret_stack 2018-12-22 08:21:02 -05:00
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
traps.c arm64: Handle serror in NMI context 2019-02-06 10:05:22 +00:00
vdso.c
vmlinux.lds.S arm64: relocatable: fix inconsistencies in linker script and options 2018-12-04 12:48:25 +00:00