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linux/arch/x86/kernel
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Rong Zhang e6416c2dfe x86/CPU/AMD: Prevent reset reasons from being retained across reboot 
The S5_RESET_STATUS register is parsed on boot and printed to kmsg.
However, this could sometimes be misleading and lead to users wasting a
lot of time on meaningless debugging for two reasons:

* Some bits are never cleared by hardware. It's the software's
responsibility to clear them as per the Processor Programming Reference
(see [1]).

* Some rare hardware-initiated platform resets do not update the
register at all.

In both cases, a previous reboot could leave its trace in the register,
resulting in users seeing unrelated reboot reasons while debugging random
reboots afterward.

Write the read value back to the register in order to clear all reason bits
since they are write-1-to-clear while the others must be preserved.

  [1]: https://bugzilla.kernel.org/show_bug.cgi?id=206537#attach_303991

  [ bp: Massage commit message. ]

Fixes: ab81310287 ("x86/CPU/AMD: Print the reason for the last reset")
Signed-off-by: Rong Zhang <i@rong.moe>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Mario Limonciello (AMD) <superm1@kernel.org>
Reviewed-by: Yazen Ghannam <yazen.ghannam@amd.com>
Cc: <stable@kernel.org>
Link: https://lore.kernel.org/all/20250913144245.23237-1-i@rong.moe/
 		2025-10-15 21:38:06 +02:00
..
acpi x86/acpi/cstate: Remove open coded check for cpu_feature_enabled() 2025-09-22 19:16:51 +02:00
apic x86/apic/savic: Do not use snp_abort() 2025-09-04 13:12:51 +02:00
cpu x86/CPU/AMD: Prevent reset reasons from being retained across reboot 2025-10-15 21:38:06 +02:00
fpu kernel-6.18-rc1.clone3 2025-09-29 10:36:50 -07:00
kprobes kcfi: Rename CONFIG_CFI_CLANG to CONFIG_CFI 2025-09-24 14:29:14 -07:00
.gitignore
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Makefile kcfi: Rename CONFIG_CFI_CLANG to CONFIG_CFI 2025-09-24 14:29:14 -07:00
alternative.c - Remove a bunch of asm implementing condition flags testing in KVM's 2025-10-11 11:19:16 -07:00
amd_gart_64.c x86/platform/amd: Move the <asm/amd_nb.h> header to <asm/amd/nb.h> 2025-04-14 09:34:14 +02:00
amd_nb.c x86/cpuid: Set <asm/cpuid/api.h> as the main CPUID header 2025-05-15 18:23:55 +02:00
amd_node.c x86/platform/amd: Move the <asm/amd_node.h> header to <asm/amd/node.h> 2025-04-14 09:34:17 +02:00
aperture_64.c x86/platform/amd: Move the <asm/amd_nb.h> header to <asm/amd/nb.h> 2025-04-14 09:34:14 +02:00
apm_32.c x86/apm_32: Remove dead function apm_get_battery_status() 2024-02-21 19:38:03 +01:00
asm-offsets.c x86/fred: Play nice with invoking asm_fred_entry_from_kvm() on non-FRED hardware 2025-08-18 14:23:08 +02:00
asm-offsets_32.c x86/asm-offsets: Export certain 'struct cpuinfo_x86' fields for 64-bit asm use too 2025-05-15 09:12:07 +02:00
asm-offsets_64.c x86/stackprotector/64: Convert to normal per-CPU variable 2025-02-18 10:15:09 +01:00
audit_64.c x86/audit: Fix -Wmissing-variable-declarations warning for ia32_xyz_class 2023-08-30 10:11:16 +02:00
bootflag.c x86/bootflag: Replace open-coded parity calculation with parity8() 2025-02-27 14:00:30 +01:00
callthunks.c x86/alternatives: Rename 'apply_relocation()' to 'text_poke_apply_relocation()' 2025-04-11 11:01:35 +02:00
cet.c x86/msr: Add explicit includes of <asm/msr.h> 2025-05-02 10:23:47 +02:00
cfi.c x86/traps: Clarify KCFI instruction layout 2025-09-04 21:59:07 +02:00
check.c
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cpuid.c x86/cpuid: make cpuid_class a static const structure 2023-08-05 08:31:41 +02:00
crash.c x86/kexec: fix potential cmem->ranges out of memory 2025-09-13 17:32:54 -07:00
crash_dump_32.c
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crash_dump_64.c
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devicetree.c x86/of: Don't use DTB for SMP setup if ACPI is enabled 2025-02-25 22:13:02 +01:00
doublefault_32.c
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dumpstack.c x86/nmi: Consolidate NMI panic variables 2025-04-01 22:25:56 +02:00
dumpstack_32.c x86/irq: Move irq stacks to percpu hot section 2025-03-04 20:30:33 +01:00
dumpstack_64.c x86/irq: Move irq stacks to percpu hot section 2025-03-04 20:30:33 +01:00
e820.c x86/e820: temporarily enable KHO scratch for memory below 1M 2025-05-12 23:50:41 -07:00
early-quirks.c drm/intel/pciids: rename i915_pciids.h to just pciids.h 2024-10-29 16:14:04 +02:00
early_printk.c Linux 6.15-rc4 2025-05-06 12:03:03 +02:00
ebda.c
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eisa.c x86/EISA: Dereference memory directly instead of using readl() 2024-08-29 15:57:09 +02:00
espfix_64.c x86/fred: No ESPFIX needed when FRED is enabled 2024-01-31 22:01:51 +01:00
fred.c x86/msr: Add explicit includes of <asm/msr.h> 2025-05-02 10:23:47 +02:00
ftrace.c x86/ftrace: enable EXECMEM_ROX_CACHE for ftrace allocations 2025-08-02 12:06:12 -07:00
ftrace_32.S fgraph: Replace fgraph_ret_regs with ftrace_regs 2024-12-26 10:50:02 -05:00
ftrace_64.S x86/cfi: Clean up linkage 2025-02-14 10:32:05 +01:00
head32.c x86/microcode: Consolidate the loader enablement checking 2025-05-05 10:51:00 +02:00
head64.c x86/boot: Create a confined code area for startup code 2025-09-03 18:00:01 +02:00
head_32.S x86/boot: Move startup code out of __head section 2025-09-03 18:06:04 +02:00
head_64.S x86/boot: Move startup code out of __head section 2025-09-03 18:06:04 +02:00
hpet.c x86/cpuid: Set <asm/cpuid/api.h> as the main CPUID header 2025-05-15 18:23:55 +02:00
hw_breakpoint.c
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i8237.c
…
i8253.c x86/i8253: Call clockevent_i8253_disable() with interrupts disabled 2025-04-11 07:28:20 +02:00
i8259.c x86/irq: Fix missing declaration of 'io_apic_irqs' 2025-02-27 22:52:37 +01:00
ibt_selftest.S x86/ibt: Convert IBT selftest to asm 2023-08-17 17:07:09 +02:00
idt.c x86/irq: Install posted MSI notification handler 2024-04-30 00:54:42 +02:00
io_delay.c
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ioport.c x86/iopl: Cure TIF_IO_BITMAP inconsistencies 2025-06-03 15:56:39 +02:00
irq.c x86/irq: Plug vector setup race 2025-08-04 23:34:03 +02:00
irq_32.c x86/irq: Move irq stacks to percpu hot section 2025-03-04 20:30:33 +01:00
irq_64.c x86/irq: Move irq stacks to percpu hot section 2025-03-04 20:30:33 +01:00
irq_work.c x86/apic: Wrap IPI calls into helper functions 2023-08-09 12:00:55 -07:00
irqflags.S x86/cfi: Clean up linkage 2025-02-14 10:32:05 +01:00
irqinit.c x86/fred: Install system vector handlers even if FRED isn't fully enabled 2025-08-18 14:23:08 +02:00
itmt.c x86/itmt: Add debugfs file to show core priorities 2025-07-07 22:35:51 +02:00
jailhouse.c x86/cpuid: Rename hypervisor_cpuid_base()/for_each_possible_hypervisor_cpuid_base() to cpuid_base_hypervisor()/for_each_possible_cpuid_base_hypervisor() 2025-05-16 10:54:47 +02:00
jump_label.c x86/alternatives: Rename 'text_poke_queue()' to 'smp_text_poke_batch_add()' 2025-04-11 11:01:33 +02:00
kdebugfs.c
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kexec-bzimage64.c x86/kexec: carry forward the boot DTB on kexec 2025-09-13 17:32:43 -07:00
kgdb.c x86/traps: Initialize DR7 by writing its architectural reset value 2025-06-24 13:15:52 -07:00
ksysfs.c sysfs: treewide: switch back to attribute_group::bin_attrs 2025-06-17 10:44:15 +02:00
kvm.c x86/kvm: Prefer native qspinlock for dedicated vCPUs irrespective of PV_UNHALT 2025-09-11 08:58:37 -07:00
kvmclock.c x86/pvops/msr: Refactor pv_cpu_ops.write_msr{,_safe}() 2025-05-02 10:36:36 +02:00
ldt.c x86/bugs: Rename CONFIG_PAGE_TABLE_ISOLATION => CONFIG_MITIGATION_PAGE_TABLE_ISOLATION 2024-01-10 10:52:28 +01:00
machine_kexec_32.c x86/mm: Fix _pgd_alloc() for Xen PV mode 2025-04-23 07:49:14 -07:00
machine_kexec_64.c - Remove a bunch of asm implementing condition flags testing in KVM's 2025-10-11 11:19:16 -07:00
mmconf-fam10h_64.c x86/msr: Rename 'wrmsrl()' to 'wrmsrq()' 2025-04-10 11:58:33 +02:00
module.c Merge commit 'its-for-linus-20250509-merge' into x86/core, to resolve conflicts 2025-05-13 10:47:10 +02:00
mpparse.c x86/mpparse: Cleanup apic_printk()s 2024-08-07 18:13:28 +02:00
msr.c x86/MSR: make msr_class a static const structure 2023-08-05 08:31:42 +02:00
nmi.c x86/nmi: Improve NMI duration console printouts 2025-04-01 22:26:38 +02:00
nmi_selftest.c x86/nmi: Clean up NMI selftest 2025-04-01 22:26:32 +02:00
paravirt-spinlocks.c
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paravirt.c x86/paravirt: Restrict PARAVIRT_XXL to 64-bit only 2025-05-17 10:38:29 +02:00
pci-dma.c Documentation: Merge x86-specific boot options doc into kernel-parameters.txt 2024-12-10 18:25:40 +01:00
pcspeaker.c
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perf_regs.c
…
platform-quirks.c
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pmem.c
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probe_roms.c x86/sev: Skip ROM range scans and validation for SEV-SNP guests 2024-03-26 15:22:35 +01:00
process.c - Make TDX and kexec work together 2025-10-04 10:01:30 -07:00
process.h
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process_32.c x86/traps: Initialize DR7 by writing its architectural reset value 2025-06-24 13:15:52 -07:00
process_64.c x86/process: Clear hardware feedback history for AMD processors 2025-07-07 22:30:36 +02:00
ptrace.c x86/ptrace: Use USER_REGSET_NOTE_TYPE() to specify regset note names 2025-07-14 22:27:48 -07:00
pvclock.c
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quirks.c x86/platform: Fix missing declaration of 'x86_apple_machine' 2025-02-27 22:52:37 +01:00
reboot.c x86/smp/32: Remove safe_smp_processor_id() 2025-03-03 20:30:09 +01:00
reboot_fixups_32.c x86/msr: Rename 'wrmsrl()' to 'wrmsrq()' 2025-04-10 11:58:33 +02:00
relocate_kernel_32.S x86/asm: Remove semicolon from "rep" prefixes 2025-04-18 09:33:33 +02:00
relocate_kernel_64.S x86/sme: Use percpu boolean to control WBINVD during kexec 2025-09-05 10:40:40 -07:00
resource.c
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rethook.c
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rtc.c x86/rtc: Remove unused intel-mid.h 2024-04-03 08:24:48 -07:00
setup.c Significant patch series in this pull request: 2025-08-03 16:23:09 -07:00
setup_percpu.c x86/smp: Move this_cpu_off to percpu hot section 2025-03-04 20:30:33 +01:00
sev_verify_cbit.S x86/boot: Use 32-bit XOR to clear registers 2024-03-01 12:47:37 +01:00
shstk.c Performance events updates for v6.18: 2025-09-30 11:11:21 -07:00
signal.c x86/fpu: Convert task_struct::thread.fpu accesses to use x86_task_fpu() 2025-04-14 08:18:29 +02:00
signal_32.c x86/fred/signal: Prevent immediate repeat of single step trap on return from SIGTRAP handler 2025-06-09 08:50:58 -07:00
signal_64.c x86/fred/signal: Prevent immediate repeat of single step trap on return from SIGTRAP handler 2025-06-09 08:50:58 -07:00
smp.c x86/smp: PM/hibernate: Split arch_resume_nosmt() 2025-06-07 14:22:56 +02:00
smpboot.c sched/fair: Get rid of sched_domains_curr_level hack for tl->cpumask() 2025-09-03 10:03:12 +02:00
stacktrace.c
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static_call.c Merge commit 'its-for-linus-20250509-merge' into x86/core, to resolve conflicts 2025-05-13 10:47:10 +02:00
step.c x86/msr: Prepare for including <linux/percpu.h> into <asm/msr.h> 2024-03-04 12:01:39 +01:00
sys_ia32.c
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sys_x86_64.c arch/x86: teach arch_get_unmapped_area_vmflags to handle hugetlb mappings 2024-11-06 20:11:10 -08:00
tboot.c x86/e820: Drop obsolete E820_TYPE_RESERVED_KERN and related code 2025-02-21 16:05:00 +01:00
time.c x86: stop playing stack games in profile_pc() 2024-06-28 14:27:22 -07:00
tls.c
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tls.h
…
trace.c
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trace_clock.c x86/msr: Add explicit includes of <asm/msr.h> 2025-05-02 10:23:47 +02:00
traps.c x86,ibt: Use UDB instead of 0xEA 2025-09-04 21:59:09 +02:00
tsc.c x86/cpuid: Set <asm/cpuid/api.h> as the main CPUID header 2025-05-15 18:23:55 +02:00
tsc_msr.c x86/cpu: Fix #define name for Intel CPU model 0x5A 2025-02-04 10:05:53 -08:00
tsc_sync.c x86/msr: Add explicit includes of <asm/msr.h> 2025-05-02 10:23:47 +02:00
umip.c x86/umip: Fix decoding of register forms of 0F 01 (SGDT and SIDT aliases) 2025-09-19 21:34:48 +02:00
unwind_frame.c
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unwind_guess.c
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unwind_orc.c x86: Use RCU in all users of __module_address(). 2025-03-10 11:54:45 +01:00
uprobes.c uprobes/x86: Return error from uprobe syscall when not called from trampoline 2025-09-15 13:46:29 +02:00
verify_cpu.S x86/cpufeatures: Generate the <asm/cpufeaturemasks.h> header based on build config 2025-03-19 11:15:11 +01:00
vm86_32.c arch: remove get_task_comm() and print task comm directly 2025-01-12 20:21:15 -08:00
vmcore_info_32.c crash: split vmcoreinfo exporting code out from crash_core.c 2024-02-23 17:48:22 -08:00
vmcore_info_64.c crash: split vmcoreinfo exporting code out from crash_core.c 2024-02-23 17:48:22 -08:00
vmlinux.lds.S x86/boot: Get rid of the .head.text section 2025-09-03 18:06:32 +02:00
vsmp_64.c x86/apic: Remove unused phys_pkg_id() callback 2024-02-15 22:07:38 +01:00
x86_init.c xen: allow mapping ACPI data using a different physical address 2024-09-12 08:25:07 +02:00