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Breno Leitao 4974e4aa87 x86/nmi: Fix the inverse "in NMI handler" check 
[ Upstream commit d54e56f31a ]

Commit 344da544f1 ("x86/nmi: Print reasons why backtrace NMIs are
ignored") creates a super nice framework to diagnose NMIs.

Every time nmi_exc() is called, it increments a per_cpu counter
(nsp->idt_nmi_seq). At its exit, it also increments the same counter.  By
reading this counter it can be seen how many times that function was called
(dividing by 2), and, if the function is still being executed, by checking
the idt_nmi_seq's least significant bit.

On the check side (nmi_backtrace_stall_check()), that variable is queried
to check if the NMI is still being executed, but, there is a mistake in the
bitwise operation. That code wants to check if the least significant bit of
the idt_nmi_seq is set or not, but does the opposite, and checks for all
the other bits, which will always be true after the first exc_nmi()
executed successfully.

This appends the misleading string to the dump "(CPU currently in NMI
handler function)"

Fix it by checking the least significant bit, and if it is set, append the
string.

Fixes: 344da544f1 ("x86/nmi: Print reasons why backtrace NMIs are ignored")
Signed-off-by: Breno Leitao <leitao@debian.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Paul E. McKenney <paulmck@kernel.org>
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/20240207165237.1048837-1-leitao@debian.org
Signed-off-by: Sasha Levin <sashal@kernel.org>
2024-04-03 15:32:07 +02:00
..
acpi ACPI: CPPC: enable AMD CPPC V2 support for family 17h processors 2024-03-26 18:16:51 -04:00
apic x86/cleanups changes for v6.8: 2024-01-08 17:23:32 -08:00
cpu x86/resctrl: Implement new mba_MBps throttling heuristic 2024-03-26 18:16:29 -04:00
fpu x86/fpu: Stop relying on userspace for info to fault in xsave buffer 2024-01-30 07:25:48 -08:00
kprobes x86/kprobes: fix incorrect return address calculation in kprobe_emulate_call_indirect 2024-01-04 14:10:59 +09:00
.gitignore
alternative.c x86/paravirt: Make BUG_func() usable by non-GPL modules 2024-01-22 15:51:07 +01:00
amd_gart_64.c arch/x86: Fix typos 2024-01-03 11:46:22 +01:00
amd_nb.c X86 core code updates: 2023-10-30 17:37:47 -10:00
aperture_64.c x86/pci: Use PCI_HEADER_TYPE_* instead of literals 2023-12-01 15:00:43 -06:00
apm_32.c x86/asm: Replace magic numbers in GDT descriptors, script-generated change 2023-12-20 10:57:38 +01:00
asm-offsets.c x86/tdx: Make TDX_HYPERCALL asm similar to TDX_MODULE_CALL 2023-09-12 16:28:13 -07:00
asm-offsets_32.c
asm-offsets_64.c
audit_64.c x86/audit: Fix -Wmissing-variable-declarations warning for ia32_xyz_class 2023-08-30 10:11:16 +02:00
bootflag.c
callthunks.c x86/paravirt: Switch mixed paravirt/alternative calls to alternatives 2023-12-10 23:33:09 +01:00
cet.c x86/ibt: Convert IBT selftest to asm 2023-08-17 17:07:09 +02:00
cfi.c cfi: Flip headers 2023-12-15 16:25:55 -08:00
check.c
cpuid.c x86/cpuid: make cpuid_class a static const structure 2023-08-05 08:31:41 +02:00
crash.c x86/crash: use SZ_1M macro instead of hardcoded value 2024-01-05 10:45:25 -08:00
crash_core_32.c
crash_core_64.c
crash_dump_32.c
crash_dump_64.c
devicetree.c x86/of: Move the x86_flattree_get_config() call out of x86_dtb_init() 2023-10-02 21:30:09 +02:00
doublefault_32.c x86: Avoid missing-prototype warnings for doublefault code 2023-05-18 11:56:18 -07:00
dumpstack.c x86/show_trace_log_lvl: Ensure stack pointer is aligned, again 2023-05-16 06:31:04 -07:00
dumpstack_32.c
dumpstack_64.c
e820.c x86/e820: Don't reserve SETUP_RNG_SEED in e820 2024-03-01 10:27:20 -08:00
early-quirks.c x86/pci: Use PCI_HEADER_TYPE_* instead of literals 2023-12-01 15:00:43 -06:00
early_printk.c
ebda.c
eisa.c
espfix_64.c
ftrace.c x86/ftrace: Remove unsued extern declaration ftrace_regs_caller_ret() 2023-07-10 21:38:13 -04:00
ftrace_32.S x86/headers: Replace #include <asm/export.h> with #include <linux/export.h> 2023-10-03 10:38:07 +02:00
ftrace_64.S x86/headers: Replace #include <asm/export.h> with #include <linux/export.h> 2023-10-03 10:38:07 +02:00
head32.c x86/microcode/32: Move early loading after paging enable 2023-10-18 22:15:01 +02:00
head64.c x86/asm: Always set A (accessed) flag in GDT descriptors 2023-12-20 10:57:51 +01:00
head_32.S Major microcode loader restructuring, cleanup and improvements by Thomas 2023-11-04 08:46:37 -10:00
head_64.S x86/cleanups changes for v6.8: 2024-01-08 17:23:32 -08:00
hpet.c RTC for 6.8 2024-01-18 17:25:39 -08:00
hw_breakpoint.c
i8237.c
i8253.c
i8259.c x86/i8259: Skip probing when ACPI/MADT advertises PCAT compatibility 2023-10-27 20:36:49 +02:00
ibt_selftest.S x86/ibt: Convert IBT selftest to asm 2023-08-17 17:07:09 +02:00
idt.c x86/entry: Convert INT 0x80 emulation to IDTENTRY 2023-12-07 09:51:29 -08:00
io_delay.c
ioport.c
irq.c x86/apic: Nuke ack_APIC_irq() 2023-08-09 11:58:34 -07:00
irq_32.c
irq_64.c
irq_work.c x86/apic: Wrap IPI calls into helper functions 2023-08-09 12:00:55 -07:00
irqflags.S x86/headers: Replace #include <asm/export.h> with #include <linux/export.h> 2023-10-03 10:38:07 +02:00
irqinit.c
itmt.c arch/x86: Remove now superfluous sentinel elem from ctl_table arrays 2023-10-10 15:22:02 -07:00
jailhouse.c x86/apic: Remove the pointless APIC version check 2023-08-09 11:58:19 -07:00
jump_label.c
kdebugfs.c
kexec-bzimage64.c x86/kexec: fix incorrect argument passed to kexec_dprintk() 2023-12-29 12:22:28 -08:00
kgdb.c x86/kgdb: Fix a kerneldoc warning when build with W=1 2023-09-24 11:00:13 +02:00
ksysfs.c
kvm.c x86/kvm: Fix SEV check in sev_map_percpu_data() 2024-01-31 16:21:01 -05:00
kvmclock.c Generic: 2024-01-17 13:03:37 -08:00
ldt.c arch/x86: Fix typos 2024-01-03 11:46:22 +01:00
machine_kexec_32.c
machine_kexec_64.c x86/kexec: fix incorrect end address passed to kernel_ident_mapping_init() 2023-12-29 12:22:29 -08:00
Makefile x86/boot/32: Disable stackprotector and tracing for mk_early_pgtbl_32() 2023-10-18 11:11:43 +02:00
mmconf-fam10h_64.c
module.c x86/paravirt: Switch mixed paravirt/alternative calls to alternatives 2023-12-10 23:33:09 +01:00
mpparse.c x86/apic: Sanitize APIC address setup 2023-08-09 11:58:20 -07:00
msr.c x86/MSR: make msr_class a static const structure 2023-08-05 08:31:42 +02:00
nmi.c x86/nmi: Fix the inverse "in NMI handler" check 2024-04-03 15:32:07 +02:00
nmi_selftest.c x86/apic: Wrap IPI calls into helper functions 2023-08-09 12:00:55 -07:00
paravirt-spinlocks.c
paravirt.c x86/paravirt: Remove no longer needed paravirt patching code 2023-12-10 23:34:37 +01:00
pci-dma.c x86: always initialize xen-swiotlb when xen-pcifront is enabling 2023-07-31 17:54:27 +02:00
pcspeaker.c
perf_regs.c
platform-quirks.c x86/quirks: Include linux/pnp.h for arch_pnpbios_disabled() 2023-05-18 11:56:18 -07:00
pmem.c
probe_roms.c
process.c arch/x86: Fix typos 2024-01-03 11:46:22 +01:00
process.h
process_32.c
process_64.c x86/shstk: Add ARCH_SHSTK_STATUS 2023-08-02 15:01:51 -07:00
ptrace.c x86: Add PTRACE interface for shadow stack 2023-08-02 15:01:51 -07:00
pvclock.c locking/atomic: treewide: use raw_atomic*_<op>() 2023-06-05 09:57:20 +02:00
quirks.c
reboot.c x86/reboot: Expose VMCS crash hooks if and only if KVM_{INTEL,AMD} is enabled 2023-08-03 15:37:14 -07:00
reboot_fixups_32.c
relocate_kernel_32.S
relocate_kernel_64.S
resource.c
rethook.c
rtc.c rtc: Extend timeout for waiting for UIP to clear to 1s 2023-12-17 22:33:55 +01:00
setup.c - Add support managing TDX host hardware 2024-01-18 13:41:48 -08:00
setup_percpu.c x86/asm: Add DB flag to 32-bit percpu GDT entry 2023-12-20 10:57:51 +01:00
sev-shared.c arch/x86: Fix typos 2024-01-03 11:46:22 +01:00
sev.c x86/sev: Fix kernel crash due to late update to read-only ghcb_version 2023-11-30 10:23:12 +01:00
sev_verify_cbit.S
shstk.c x86/shstk: Add warning for shadow stack double unmap 2023-09-19 09:18:34 -07:00
signal.c rseq: Split out rseq.h from sched.h 2023-12-27 11:49:56 -05:00
signal_32.c x86/shstk: Add user control-protection fault handler 2023-08-02 15:01:50 -07:00
signal_64.c x86/shstk: Delay signal entry SSP write until after user accesses 2023-11-08 08:55:37 -08:00
smp.c Revert "x86/smp: Put CPUs into INIT on shutdown if possible" 2023-10-15 12:02:02 -07:00
smpboot.c x86/smp: Export symbol cpu_clustergroup_mask() 2023-11-17 10:54:52 +01:00
stacktrace.c
static_call.c x86/static_call: Fix __static_call_fixup() 2023-08-17 13:24:09 +02:00
step.c
sys_ia32.c
sys_x86_64.c x86/mm: Introduce MAP_ABOVE4G 2023-07-11 14:12:19 -07:00
tboot.c
time.c
tls.c
tls.h
topology.c x86/topology: convert to use arch_cpu_is_hotpluggable() 2023-12-06 12:41:49 +09:00
trace.c
trace_clock.c
tracepoint.c
traps.c IOMMU Updates for Linux v6.8 2024-01-18 15:16:57 -08:00
tsc.c x86/tsc: Extend watchdog check exemption to 4-Sockets platform 2023-07-14 15:17:09 -07:00
tsc_msr.c
tsc_sync.c x86/tsc: Defer marking TSC unstable to a worker 2023-10-27 20:36:57 +02:00
umip.c
unwind_frame.c
unwind_guess.c
unwind_orc.c x86/unwind/orc: Remove redundant initialization of 'mid' pointer in __orc_find() 2023-09-21 08:41:23 +02:00
uprobes.c
verify_cpu.S
vm86_32.c
vmlinux.lds.S x86/paravirt: Remove no longer needed paravirt patching code 2023-12-10 23:34:37 +01:00
vsmp_64.c x86/apic: Use u32 for phys_pkg_id() 2023-10-10 14:38:19 +02:00
x86_init.c - Fix a race window where load_unaligned_zeropad() could cause 2023-06-26 16:32:47 -07:00