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Ard Biesheuvel 23715a26c8 arm64: efi: Recover from synchronous exceptions occurring in firmware 
Unlike x86, which has machinery to deal with page faults that occur
during the execution of EFI runtime services, arm64 has nothing like
that, and a synchronous exception raised by firmware code brings down
the whole system.

With more EFI based systems appearing that were not built to run Linux
(such as the Windows-on-ARM laptops based on Qualcomm SOCs), as well as
the introduction of PRM (platform specific firmware routines that are
callable just like EFI runtime services), we are more likely to run into
issues of this sort, and it is much more likely that we can identify and
work around such issues if they don't bring down the system entirely.

Since we already use a EFI runtime services call wrapper in assembler,
we can quite easily add some code that captures the execution state at
the point where the call is made, allowing us to revert to this state
and proceed execution if the call triggered a synchronous exception.

Given that the kernel and the firmware don't share any data structures
that could end up in an indeterminate state, we can happily continue
running, as long as we mark the EFI runtime services as unavailable from
that point on.

Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
2022-11-03 18:01:15 +01:00
..
pi arm64: adjust KASLR relocation after ARCH_RANDOM removal 2022-08-17 14:52:50 +01:00
probes arm64/kprobe: Optimize the performance of patching single-step slot 2022-09-30 09:17:15 +01:00
vdso arm64 updates for 6.1: 2022-10-06 11:51:49 -07:00
vdso32 arm64: vdso32: Add DWARF_DEBUG 2022-07-01 12:07:43 +01:00
.gitignore
acpi.c arm64: mm: Convert to GENERIC_IOREMAP 2022-06-27 12:22:31 +01:00
acpi_numa.c arm64: numa: Don't check node against MAX_NUMNODES 2022-07-19 19:10:28 +01:00
acpi_parking_protocol.c treewide: Drop function_nocfi 2022-09-26 10:13:14 -07:00
alternative.c arm64 updates for 6.1: 2022-10-06 11:51:49 -07:00
armv8_deprecated.c arm64: fix oops in concurrently setting insn_emulation sysctls 2022-07-04 12:18:47 +01:00
asm-offsets.c
cacheinfo.c arm64: cacheinfo: Fix incorrect assignment of signed error value to unsigned fw_level 2022-08-23 11:10:24 +01:00
compat_alignment.c arm64: compat: Implement misalignment fixups for multiword loads 2022-09-06 09:34:53 +01:00
cpu-reset.S arm64: Add types to indirect called assembly functions 2022-09-26 10:13:13 -07:00
cpu_errata.c arm64: errata: Add Cortex-A55 to the repeat tlbi list 2022-10-07 14:42:20 +01:00
cpu_ops.c
cpufeature.c arm64 updates for 6.1: 2022-10-06 11:51:49 -07:00
cpuidle.c arm64: cpuidle: remove generic cpuidle support 2022-06-23 14:19:33 +01:00
cpuinfo.c arm64/sysreg: Add hwcap for SVE EBF16 2022-09-06 18:53:52 +01:00
crash_core.c
crash_dump.c vmcore: convert copy_oldmem_page() to take an iov_iter 2022-04-29 14:37:59 -07:00
debug-monitors.c arm64/sysreg: Add _EL1 into ID_AA64DFR0_EL1 definition names 2022-09-16 12:38:57 +01:00
efi-entry.S
efi-header.S
efi-rt-wrapper.S arm64: efi: Recover from synchronous exceptions occurring in firmware 2022-11-03 18:01:15 +01:00
efi.c arm64: efi: Recover from synchronous exceptions occurring in firmware 2022-11-03 18:01:15 +01:00
elfcore.c arm64: Change elfcore for_each_mte_vma() to use VMA iterator 2022-09-26 19:46:19 -07:00
entry-common.c arm64: rework BTI exception handling 2022-09-16 12:17:03 +01:00
entry-fpsimd.S arm64/sme: Implement ZA context switching 2022-04-22 18:51:02 +01:00
entry-ftrace.S arm64: ftrace: remove redundant label 2022-06-15 16:14:47 +01:00
entry.S arm64: alternatives: have callbacks take a cap 2022-09-16 17:15:03 +01:00
fpsimd.c arm64/sme: Don't flush SVE register state when handling SME traps 2022-08-23 11:29:12 +01:00
ftrace.c arm64 updates for 6.1: 2022-10-06 11:51:49 -07:00
head.S arm64 updates for 6.1: 2022-10-06 11:51:49 -07:00
hibernate-asm.S
hibernate.c arm64: kasan: Revert "arm64: mte: reset the page tag in page->flags" 2022-07-07 10:48:37 +01:00
hw_breakpoint.c arm64: Treat ESR_ELx as a 64-bit register 2022-04-29 19:26:27 +01:00
hyp-stub.S arm64/sysreg: Standardise naming for ID_AA64MMFR1_EL1 fields 2022-09-09 10:59:03 +01:00
idle.c
idreg-override.c arm64/sysreg: Standardise naming for ID_AA64MMFR1_EL1 fields 2022-09-09 10:59:03 +01:00
image-vars.h EFI updates for v6.1 2022-10-09 08:56:54 -07:00
image.h
io.c
irq.c arm64: run softirqs on the per-CPU IRQ stack 2022-09-09 19:01:38 +01:00
jump_label.c jump_label: make initial NOP patching the special case 2022-06-24 09:48:55 +02:00
kaslr.c random: handle archrandom with multiple longs 2022-07-25 13:26:14 +02:00
kexec_image.c arm64: kexec_file: use more system keyrings to verify kernel image signature 2022-07-15 12:21:16 -04:00
kgdb.c arm64: Treat ESR_ELx as a 64-bit register 2022-04-29 19:26:27 +01:00
kuser32.S arm64: compat: Move kuser32.S to .rodata section 2022-06-23 16:01:42 +01:00
machine_kexec.c treewide: Drop function_nocfi 2022-09-26 10:13:14 -07:00
machine_kexec_file.c arm64/kexec: Fix missing extra range for crashkres_low. 2022-09-01 11:50:00 +01:00
Makefile Kbuild updates for v6.1 2022-10-10 12:00:45 -07:00
module-plts.c arm64: module: Make plt_equals_entry() static 2022-09-29 17:47:18 +01:00
module.c arm64: module: move find_section to header 2022-09-09 12:27:25 +01:00
mte.c arm64: mte: Avoid setting PG_mte_tagged if no tags cleared or restored 2022-10-12 10:00:19 +01:00
paravirt.c arm64: paravirt: Use RCU read locks to guard stolen_time 2022-05-17 14:23:37 +01:00
patching.c arm64: patch_text: Fixup last cpu should be master 2022-04-08 11:43:46 +01:00
pci.c
perf_callchain.c
perf_event.c arm64/sysreg: Use feature numbering for PMU and SPE revisions 2022-09-16 12:38:57 +01:00
perf_regs.c perf: arm64: Add SVE vector granule register to user regs 2022-09-22 15:06:02 +01:00
pointer_auth.c
process.c Random number generator fixes for Linux 6.1-rc1. 2022-10-16 15:27:07 -07:00
proton-pack.c arm64: Add AMPERE1 to the Spectre-BHB affected list 2022-10-12 17:36:06 +01:00
psci.c treewide: Drop function_nocfi 2022-09-26 10:13:14 -07:00
ptrace.c arm64 updates for 6.1: 2022-10-06 11:51:49 -07:00
reloc_test_core.c ARM64: reloc_test: add __init/__exit annotations to module init/exit funcs 2022-09-29 18:04:25 +01:00
reloc_test_syms.S
relocate_kernel.S arm64: kexec: load from kimage prior to clobbering 2022-05-17 14:25:35 +01:00
return_address.c
sdei.c arm64: stacktrace: move SDEI stack helpers to stacktrace code 2022-09-09 12:30:07 +01:00
setup.c arm64: fix KASAN_INLINE 2022-07-20 16:08:10 +01:00
signal.c arm64/sme: Don't flush SVE register state when allocating SME storage 2022-08-23 11:29:11 +01:00
signal32.c signal: Deliver SIGTRAP on perf event asynchronously if blocked 2022-04-22 12:14:05 +02:00
sigreturn32.S arm64: compat: Move sigreturn32.S to .rodata section 2022-07-01 12:05:45 +01:00
sleep.S arm64: mm: fix resume for 52-bit enabled builds 2022-09-10 14:46:28 +01:00
smccc-call.S
smp.c profile: setup_profiling_timer() is moslty not implemented 2022-07-29 18:12:36 -07:00
smp_spin_table.c treewide: Drop function_nocfi 2022-09-26 10:13:14 -07:00
stacktrace.c arm64: stacktrace: track hyp stacks in unwinder's address space 2022-09-09 12:30:08 +01:00
suspend.c arm64: mte: move register initialization to C 2022-09-22 18:02:50 +01:00
sys.c
sys32.c
sys_compat.c arm64: compat: Do not treat syscall number as ESR_ELx for a bad syscall 2022-04-29 19:26:27 +01:00
syscall.c treewide: use get_random_{u8,u16}() when possible, part 1 2022-10-11 17:42:58 -06:00
time.c
topology.c RISC-V Patches for the 6.1 Merge Window, Part 1 2022-10-09 13:24:01 -07:00
trace-events-emulation.h
traps.c arm64 updates for 6.1: 2022-10-06 11:51:49 -07:00
vdso-wrap.S
vdso.c - Yu Zhao's Multi-Gen LRU patches are here. They've been under test in 2022-10-10 17:53:04 -07:00
vdso32-wrap.S
vmlinux.lds.S Merge branch 'for-next/boot' into for-next/core 2022-07-25 10:59:15 +01:00