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d4d5be94a8
linux/arch/arm64/kernel
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Mark Brown d4d5be94a8 arm64/fpsimd: Ensure SME storage is allocated after SVE VL changes 
When we reconfigure the SVE vector length we discard the backing storage
for the SVE vectors and then reallocate on next SVE use, leaving the SME
specific state alone. This means that we do not enable SME traps if they
were already disabled. That means that userspace code can enter streaming
mode without trapping, putting the task in a state where if we try to save
the state of the task we will fault.

Since the ABI does not specify that changing the SVE vector length disturbs
SME state, and since SVE code may not be aware of SME code in the process,
we shouldn't simply discard any ZA state. Instead immediately reallocate
the storage for SVE, and disable SME if we change the SVE vector length
while there is no SME state active.

Disabling SME traps on SVE vector length changes would make the overall
code more complex since we would have a state where we have valid SME state
stored but might get a SME trap.

Fixes: 9e4ab6c891 ("arm64/sme: Implement vector length configuration prctl()s")
Reported-by: David Spickett <David.Spickett@arm.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/20230720-arm64-fix-sve-sme-vl-change-v2-1-8eea06b82d57@kernel.org
Signed-off-by: Will Deacon <will@kernel.org>
2023-07-21 11:11:09 +01:00
..
pi arm64: unwind: add asynchronous unwind tables to kernel and modules 2022-11-09 18:06:35 +00:00
probes arm64: kprobes: Drop ID map text from kprobes blacklist 2023-02-07 18:25:10 +00:00
vdso arm64: vdso: Clear common make C=2 warnings 2023-07-20 11:48:26 +01:00
vdso32 kbuild: Drop -Wdeclaration-after-statement 2023-06-26 11:14:19 +02:00
.gitignore
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
acpi.c arm64: acpi: Fix possible memory leak of ffh_ctxt 2023-02-24 14:21:49 +00:00
alternative.c Merge branches 'for-next/kpti', 'for-next/missing-proto-warn', 'for-next/iss2-decode', 'for-next/kselftest', 'for-next/misc', 'for-next/feat_mops', 'for-next/module-alloc', 'for-next/sysreg', 'for-next/cpucap', 'for-next/acpi', 'for-next/kdump', 'for-next/acpi-doc', 'for-next/doc' and 'for-next/tpidr2-fix', remote-tracking branch 'arm64/for-next/perf' into for-next/core 2023-06-23 18:32:20 +01:00
armv8_deprecated.c arm64: armv8_deprecated: remove unnecessary (void*) conversions 2023-03-28 15:43:44 +01:00
asm-offsets.c arm64: ftrace: fix build error with CONFIG_FUNCTION_GRAPH_TRACER=n 2023-07-05 09:46:19 -04:00
cacheinfo.c cacheinfo: Add arm64 early level initializer implementation 2023-04-13 09:32:33 +01:00
compat_alignment.c arm64: compat: Work around uninitialized variable warning 2023-04-05 17:51:47 +01:00
cpu_errata.c arm64: errata: Mitigate Ampere1 erratum AC03_CPU_38 at stage-2 2023-06-16 00:31:44 +00:00
cpu_ops.c
cpu-reset.S arm64: kernel: remove SHF_WRITE|SHF_EXECINSTR from .idmap.text 2023-05-02 12:42:22 +01:00
cpufeature.c ARM64: 2023-07-03 15:32:22 -07:00
cpuidle.c arm64: cpuidle: fix #ifdef for acpi functions 2023-05-25 17:44:02 +01:00
cpuinfo.c arm64: cpufeature: add system register ID_AA64MMFR3 2023-06-06 16:52:40 +01:00
crash_core.c arm64: move PAC masks to <asm/pointer_auth.h> 2023-04-13 12:27:11 +01:00
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: kgdb: Set PSTATE.SS to 1 to re-enable single-step 2023-04-14 13:39:47 +01:00
efi-header.S arm64: efi: Enable BTI codegen and add PE/COFF annotation 2023-04-20 15:43:45 +02:00
efi-rt-wrapper.S arm64: efi: Avoid workqueue to check whether EFI runtime is live 2023-01-16 15:27:31 +01:00
efi.c A healthy mix of EFI contributions this time: 2023-02-23 14:41:48 -08:00
elfcore.c arm64: mte: Avoid the racy walk of the vma list during core dump 2023-01-05 15:12:12 +00:00
entry-common.c Merge branches 'for-next/kpti', 'for-next/missing-proto-warn', 'for-next/iss2-decode', 'for-next/kselftest', 'for-next/misc', 'for-next/feat_mops', 'for-next/module-alloc', 'for-next/sysreg', 'for-next/cpucap', 'for-next/acpi', 'for-next/kdump', 'for-next/acpi-doc', 'for-next/doc' and 'for-next/tpidr2-fix', remote-tracking branch 'arm64/for-next/perf' into for-next/core 2023-06-23 18:32:20 +01:00
entry-fpsimd.S arm64/sme: Implement context switching for ZT0 2023-01-20 12:23:06 +00:00
entry-ftrace.S arm64: ftrace: Enable HAVE_FUNCTION_GRAPH_RETVAL 2023-06-20 18:38:37 -04:00
entry.S arm64: entry: Simplify tramp_alias macro and tramp_exit routine 2023-05-25 16:55:19 +01:00
fpsimd.c arm64/fpsimd: Ensure SME storage is allocated after SVE VL changes 2023-07-21 11:11:09 +01:00
ftrace.c arm64: module: mandate MODULE_PLTS 2023-06-06 17:39:05 +01:00
head.S ARM64: 2023-07-03 15:32:22 -07:00
hibernate-asm.S arm64: kexec: install a copy of the linear-map 2021-10-01 13:31:00 +01:00
hibernate.c arm64: hibernate: remove WARN_ON in save_processor_state 2023-06-21 13:33:49 +01:00
hw_breakpoint.c arm64: move cpu_suspend_set_dbg_restorer() prototype to header 2023-05-25 17:44:01 +01:00
hyp-stub.S ARM64: 2023-07-03 15:32:22 -07:00
idle.c arch/idle: Change arch_cpu_idle() behavior: always exit with IRQs disabled 2023-01-13 11:48:15 +01:00
idreg-override.c ARM64: 2023-07-03 15:32:22 -07:00
image-vars.h efi/zboot: arm64: Inject kernel code size symbol into the zboot payload 2023-04-26 18:01:41 +02:00
image.h
io.c
irq.c Merge branch 'for-next/stacks' into for-next/core 2022-12-06 11:26:40 +00:00
jump_label.c jump_label: make initial NOP patching the special case 2022-06-24 09:48:55 +02:00
kaslr.c Merge branch for-next/module-alloc into kvmarm/next 2023-06-15 13:04:15 +00:00
kexec_image.c arm64: Fix dangling references to Documentation/arm64 2023-06-21 08:53:31 -06:00
kgdb.c arm64: kgdb: Set PSTATE.SS to 1 to re-enable single-step 2023-04-14 13:39:47 +01:00
kuser32.S arm64: Update Documentation/arm references 2023-06-12 06:33:48 -06:00
machine_kexec_file.c arm64/kexec: Fix missing extra range for crashkres_low. 2022-09-01 11:50:00 +01:00
machine_kexec.c Merge branch 'for-next/misc' into for-next/core 2023-04-20 11:22:09 +01:00
Makefile - Arnd Bergmann has fixed a bunch of -Wmissing-prototypes in 2023-06-28 10:59:38 -07:00
module-plts.c arm64: module-plts: inline linux/moduleloader.h 2023-05-25 17:44:02 +01:00
module.c arm64: module: rework module VA range selection 2023-06-06 17:39:06 +01:00
mte.c mm/gup: remove vmas parameter from get_user_pages_remote() 2023-06-09 16:25:26 -07:00
paravirt.c arm64: paravirt: remove conduit check in has_pv_steal_clock 2022-11-09 18:11:56 +00:00
patch-scs.c arm64: Apply dynamic shadow call stack patching in two passes 2023-01-26 17:54:15 +00:00
patching.c arm64: patching: Add aarch64_insn_write_literal_u64() 2023-01-24 11:49:43 +00:00
pci.c
perf_callchain.c arm64: use XPACLRI to strip PAC 2023-04-13 12:27:11 +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 Objtool changes for v6.4: 2023-04-28 14:02:54 -07:00
proton-pack.c arm64: delete dead code in this_cpu_set_vectors() 2023-04-20 10:44:54 +01:00
psci.c treewide: Drop function_nocfi 2022-09-26 10:13:14 -07:00
ptrace.c arm64 updates for 6.3: 2023-02-21 15:27:48 -08:00
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 arm64: Make return_address() use arch_stack_walk() 2021-12-10 14:06:04 +00:00
sdei.c arm64: implement dynamic shadow call stack for Clang 2022-11-09 18:06:35 +00:00
setup.c arm64: kaslr: split kaslr/module initialization 2023-06-06 17:39:05 +01:00
signal32.c signal: Deliver SIGTRAP on perf event asynchronously if blocked 2022-04-22 12:14:05 +02:00
signal.c Merge branches 'for-next/kpti', 'for-next/missing-proto-warn', 'for-next/iss2-decode', 'for-next/kselftest', 'for-next/misc', 'for-next/feat_mops', 'for-next/module-alloc', 'for-next/sysreg', 'for-next/cpucap', 'for-next/acpi', 'for-next/kdump', 'for-next/acpi-doc', 'for-next/doc' and 'for-next/tpidr2-fix', remote-tracking branch 'arm64/for-next/perf' into for-next/core 2023-06-23 18:32:20 +01:00
sigreturn32.S arm64: compat: Move sigreturn32.S to .rodata section 2022-07-01 12:05:45 +01:00
sleep.S arm64: kernel: remove SHF_WRITE|SHF_EXECINSTR from .idmap.text 2023-05-02 12:42:22 +01:00
smccc-call.S
smp_spin_table.c treewide: Drop function_nocfi 2022-09-26 10:13:14 -07:00
smp.c arm64: smp: Switch to hotplug core state synchronization 2023-05-15 13:44:57 +02:00
stacktrace.c arm64: use XPACLRI to strip PAC 2023-04-13 12:27:11 +01:00
suspend.c cpuidle, arm64: Fix the ARM64 cpuidle logic 2023-01-18 12:27:17 +01:00
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
sys.c
syscall.c arm64: syscall: unmask DAIF for tracing status 2023-06-07 18:23:22 +01:00
time.c arm64: Make profile_pc() use arch_stack_walk() 2021-12-10 14:06:04 +00:00
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 - Yosry Ahmed brought back some cgroup v1 stats in OOM logs. 2023-06-28 10:28:11 -07:00
vdso32-wrap.S
vdso-wrap.S
vdso.c arm64: vdso: Pass (void *) to virt_to_page() 2023-05-16 14:53:36 +01:00
vmlinux.lds.S arm64: lds: move .got section out of .text 2023-05-02 13:12:45 +01:00
watchdog_hld.c arm64: enable perf events based hard lockup detector 2023-06-09 17:44:22 -07:00