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linux-stable/arch/x86/kernel
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Thomas Gleixner f9c9987bf5 x86/smp: Use dedicated cache-line for mwait_play_dead() 
Monitoring idletask::thread_info::flags in mwait_play_dead() has been an
obvious choice as all what is needed is a cache line which is not written
by other CPUs.

But there is a use case where a "dead" CPU needs to be brought out of
MWAIT: kexec().

This is required as kexec() can overwrite text, pagetables, stacks and the
monitored cacheline of the original kernel. The latter causes MWAIT to
resume execution which obviously causes havoc on the kexec kernel which
results usually in triple faults.

Use a dedicated per CPU storage to prepare for that.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Ashok Raj <ashok.raj@intel.com>
Reviewed-by: Borislav Petkov (AMD) <bp@alien8.de>
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/20230615193330.434553750@linutronix.de
2023-06-20 14:51:47 +02:00
..
acpi x86 APIC updates: 2023-04-25 11:39:45 -07:00
apic x86 APIC updates: 2023-04-25 11:39:45 -07:00
cpu x86/topology: Fix erroneous smp_num_siblings on Intel Hybrid platforms 2023-05-25 10:48:42 -07:00
fpu x86/fpu/xstate: Prevent false-positive warning in __copy_xstate_uabi_buf() 2023-03-22 10:59:13 -07:00
kprobes probes updates for 6.3: 2023-02-23 13:03:08 -08:00
.gitignore
alternative.c x86/alternatives: Teach text_poke_bp() to patch Jcc.d32 instructions 2023-01-31 15:05:31 +01:00
amd_gart_64.c x86/mm: Remove P*D_PAGE_MASK and P*D_PAGE_SIZE macros 2022-12-15 10:37:27 -08:00
amd_nb.c x86/amd_nb: Add PCI ID for family 19h model 78h 2023-05-08 11:25:19 +02:00
aperture_64.c
apm_32.c efi: x86: Wire up IBT annotation in memory attributes table 2023-02-09 19:30:54 +01:00
asm-offsets.c x86/smpboot: Remove initial_stack on 64-bit 2023-03-21 13:35:53 +01:00
asm-offsets_32.c
asm-offsets_64.c x86: Fixup asm-offsets duplicate 2022-10-17 16:41:06 +02:00
audit_64.c
bootflag.c
callthunks.c module: replace module_layout with module_memory 2023-03-09 12:55:15 -08:00
cfi.c
check.c
cpuid.c driver core: class: remove module * from class_create() 2023-03-17 15:16:33 +01:00
crash.c x86/crash: Disable virt in core NMI crash handler to avoid double shootdown 2023-01-24 10:05:21 -08:00
crash_core_32.c
crash_core_64.c
crash_dump_32.c
crash_dump_64.c use less confusing names for iov_iter direction initializers 2022-11-25 13:01:55 -05:00
devicetree.c x86/of: Add support for boot time interrupt delivery mode configuration 2022-12-02 14:57:14 +01:00
doublefault_32.c
dumpstack.c x86/show_trace_log_lvl: Ensure stack pointer is aligned, again 2023-05-16 06:31:04 -07:00
dumpstack_32.c x86/percpu: Move irq_stack variables next to current_task 2022-10-17 16:41:05 +02:00
dumpstack_64.c x86/percpu: Move irq_stack variables next to current_task 2022-10-17 16:41:05 +02:00
e820.c x86/setup: Move duplicate boot_cpu_data definition out of the ifdeffery 2023-01-11 12:45:16 +01:00
early-quirks.c
early_printk.c
ebda.c
eisa.c
espfix_64.c x86/espfix: Use get_random_long() rather than archrandom 2022-10-31 20:12:50 +01:00
ftrace.c New Feature: 2022-12-17 14:06:53 -06:00
ftrace_32.S ftrace: selftest: remove broken trace_direct_tramp 2023-03-21 13:59:29 -04:00
ftrace_64.S Objtool changes for v6.4: 2023-04-28 14:02:54 -07:00
head32.c x86/head: Mark *_start_kernel() __noreturn 2023-04-14 17:31:24 +02:00
head64.c x86/head: Mark *_start_kernel() __noreturn 2023-04-14 17:31:24 +02:00
head_32.S x86/asm/32: Remove setup_once() 2022-12-02 14:06:34 +01:00
head_64.S Objtool changes for v6.4: 2023-04-28 14:02:54 -07:00
hpet.c clocksource: Verify HPET and PMTMR when TSC unverified 2023-02-02 14:23:02 -08:00
hw_breakpoint.c x86/amd: Cache debug register values in percpu variables 2023-01-31 20:09:26 +01:00
i8237.c
i8253.c
i8259.c x86/i8259: Mark legacy PIC interrupts with IRQ_LEVEL 2023-01-16 17:24:56 +01:00
idt.c
io_delay.c
ioport.c
irq.c
irq_32.c x86/percpu: Move irq_stack variables next to current_task 2022-10-17 16:41:05 +02:00
irq_64.c x86/percpu: Move irq_stack variables next to current_task 2022-10-17 16:41:05 +02:00
irq_work.c
irqflags.S
irqinit.c x86/i8259: Mark legacy PIC interrupts with IRQ_LEVEL 2023-01-16 17:24:56 +01:00
itmt.c x86: Simplify one-level sysctl registration for itmt_kern_table 2023-03-22 11:47:21 -07:00
jailhouse.c
jump_label.c
kdebugfs.c
kexec-bzimage64.c docs: move x86 documentation into Documentation/arch/ 2023-03-30 12:58:51 -06:00
kgdb.c
ksysfs.c
kvm.c ARM64: 2022-12-15 11:12:21 -08:00
kvmclock.c sched/clock/x86: Mark sched_clock() noinstr 2023-01-31 15:01:47 +01:00
ldt.c
machine_kexec_32.c
machine_kexec_64.c x86/kexec: remove unnecessary arch_kexec_kernel_image_load() 2023-04-08 13:45:38 -07:00
Makefile rethook, fprobe: do not trace rethook related functions 2023-05-18 07:08:01 +09:00
mmconf-fam10h_64.c
module.c module: replace module_layout with module_memory 2023-03-09 12:55:15 -08:00
mpparse.c
msr.c driver core: class: remove module * from class_create() 2023-03-17 15:16:33 +01:00
nmi.c ARM: 2023-02-25 11:30:21 -08:00
nmi_selftest.c
paravirt-spinlocks.c
paravirt.c x86/paravirt: Convert simple paravirt functions to asm 2023-03-17 13:29:47 +01:00
pci-dma.c docs: move x86 documentation into Documentation/arch/ 2023-03-30 12:58:51 -06:00
pcspeaker.c
perf_regs.c
platform-quirks.c
pmem.c
probe_roms.c
process.c x86/smp: Dont access non-existing CPUID leaf 2023-06-20 14:51:46 +02:00
process.h
process_32.c x86/resctl: fix scheduler confusion with 'current' 2023-03-08 11:48:11 -08:00
process_64.c IOMMU Updates for Linux 6.4 2023-04-30 13:00:38 -07:00
ptrace.c x86: Improve formatting of user_regset arrays 2022-11-01 15:36:52 -07:00
pvclock.c sched/clock/x86: Mark sched_clock() noinstr 2023-01-31 15:01:47 +01:00
quirks.c
reboot.c cpu: Mark nmi_panic_self_stop() __noreturn 2023-04-14 17:31:26 +02:00
reboot_fixups_32.c
relocate_kernel_32.S
relocate_kernel_64.S x86,objtool: Split UNWIND_HINT_EMPTY in two 2023-03-23 23:18:58 +01:00
resource.c x86/PCI: Tidy E820 removal messages 2022-12-10 10:33:11 -06:00
rethook.c
rtc.c x86/rtc: Simplify PNP ids check 2023-01-06 04:22:34 +01:00
setup.c x86/setup: Move duplicate boot_cpu_data definition out of the ifdeffery 2023-01-11 12:45:16 +01:00
setup_percpu.c - Add the call depth tracking mitigation for Retbleed which has 2022-12-14 15:03:00 -08:00
sev-shared.c
sev.c x86/sev: Change snp_guest_issue_request()'s fw_err argument 2023-03-21 15:43:19 +01:00
sev_verify_cbit.S
signal.c x86/signal: Fix the value returned by strict_sas_size() 2023-01-15 09:54:27 +01:00
signal_32.c - Cache the AMD debug registers in per-CPU variables to avoid MSR writes 2023-02-21 14:51:40 -08:00
signal_64.c x86/signal/compat: Move sigaction_compat_abi() to signal_64.c 2023-01-06 04:16:02 +01:00
smp.c x86/smp: Remove pointless wmb()s from native_stop_other_cpus() 2023-06-20 14:51:46 +02:00
smpboot.c x86/smp: Use dedicated cache-line for mwait_play_dead() 2023-06-20 14:51:47 +02:00
stacktrace.c
static_call.c x86/static_call: Add support for Jcc tail-calls 2023-01-31 15:05:31 +01:00
step.c
sys_ia32.c
sys_x86_64.c
tboot.c
time.c
tls.c x86/gsseg: Move load_gs_index() to its own new header file 2023-01-12 13:06:36 +01:00
tls.h
topology.c x86/cpu: Switch to cpu_feature_enabled() for X86_FEATURE_XENPV 2022-11-22 16:18:19 +01:00
trace.c
trace_clock.c
tracepoint.c
traps.c IOMMU Updates for Linux 6.4 2023-04-30 13:00:38 -07:00
tsc.c Updates for timekeeping, timers and clockevent/source drivers: 2023-02-21 09:45:13 -08:00
tsc_msr.c
tsc_sync.c
umip.c
unwind_frame.c x86: kmsan: don't instrument stack walking functions 2022-10-03 14:03:25 -07:00
unwind_guess.c
unwind_orc.c x86,objtool: Split UNWIND_HINT_EMPTY in two 2023-03-23 23:18:58 +01:00
uprobes.c uprobes/x86: Allow to probe a NOP instruction with 0x66 prefix 2022-12-05 11:55:18 +01:00
verify_cpu.S
vm86_32.c
vmlinux.lds.S objtool/idle: Validate __cpuidle code as noinstr 2023-01-13 11:48:15 +01:00
vsmp_64.c
x86_init.c - Add the necessary glue so that the kernel can run as a confidential 2023-04-25 10:48:08 -07:00