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c90399fbd7
linux/arch/x86/kernel
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Thomas Gleixner c90399fbd7 x86/cpu: Ensure that CPU info updates are propagated on UP 
The boot sequence evaluates CPUID information twice:

  1) During early boot

  2) When finalizing the early setup right before
     mitigations are selected and alternatives are patched.

In both cases the evaluation is stored in boot_cpu_data, but on UP the
copying of boot_cpu_data to the per CPU info of the boot CPU happens
between #1 and #2. So any update which happens in #2 is never propagated to
the per CPU info instance.

Consolidate the whole logic and copy boot_cpu_data right before applying
alternatives as that's the point where boot_cpu_data is in it's final
state and not supposed to change anymore.

This also removes the voodoo mb() from smp_prepare_cpus_common() which
had absolutely no purpose.

Fixes: 71eb4893cf ("x86/percpu: Cure per CPU madness on UP")
Reported-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Tested-by: Guenter Roeck <linux@roeck-us.net>
Link: https://lore.kernel.org/r/20240322185305.127642785@linutronix.de
2024-03-23 12:22:04 +01:00
..
acpi ACPI updates for 6.9-rc1 2024-03-13 11:54:05 -07:00
apic Rework of APIC enumeration and topology evaluation: 2024-03-11 15:45:55 -07:00
cpu x86/cpu: Ensure that CPU info updates are propagated on UP 2024-03-23 12:22:04 +01:00
fpu x86/msr: Prepare for including <linux/percpu.h> into <asm/msr.h> 2024-03-04 12:01:39 +01:00
kprobes kprobes/x86: Use copy_from_kernel_nofault() to read from unsafe address 2024-03-22 11:40:56 +01:00
.gitignore
alternative.c - Sumanth Korikkar has taught s390 to allocate hotplug-time page frames 2024-03-14 17:43:30 -07:00
amd_gart_64.c arch/x86: Fix typos 2024-01-03 11:46:22 +01:00
amd_nb.c x86/cpu/amd: Provide a separate accessor for Node ID 2024-02-15 22:07:37 +01:00
aperture_64.c x86/pci: Use PCI_HEADER_TYPE_* instead of literals 2023-12-01 15:00:43 -06:00
apm_32.c x86/apm_32: Remove dead function apm_get_battery_status() 2024-02-21 19:38:03 +01:00
asm-offsets_32.c
asm-offsets_64.c
asm-offsets.c x86/bugs: Rename CONFIG_CALL_DEPTH_TRACKING => CONFIG_MITIGATION_CALL_DEPTH_TRACKING 2024-01-10 10:52:28 +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
callthunks.c Core x86 changes for v6.9: 2024-03-11 19:53:15 -07:00
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_dump_32.c
crash_dump_64.c use less confusing names for iov_iter direction initializers 2022-11-25 13:01:55 -05:00
crash.c x86/build changes for v6.9: 2024-03-11 19:23:16 -07:00
devicetree.c Devicetree updates for v6.9: 2024-03-15 12:37:59 -07:00
doublefault_32.c x86: Avoid missing-prototype warnings for doublefault code 2023-05-18 11:56:18 -07:00
dumpstack_32.c
dumpstack_64.c
dumpstack.c x86/bugs: Rename CONFIG_PAGE_TABLE_ISOLATION => CONFIG_MITIGATION_PAGE_TABLE_ISOLATION 2024-01-10 10:52:28 +01:00
e820.c x86/kexec: Do not update E820 kexec table for setup_data 2024-03-22 10:07:45 +01:00
early_printk.c
early-quirks.c x86/pci: Use PCI_HEADER_TYPE_* instead of literals 2023-12-01 15:00:43 -06:00
ebda.c
eisa.c
espfix_64.c x86/fred: No ESPFIX needed when FRED is enabled 2024-01-31 22:01:51 +01:00
fred.c x86/fred: Add FRED initialization functions 2024-01-31 22:03:32 +01:00
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
ftrace.c x86/bugs: Rename CONFIG_SLS => CONFIG_MITIGATION_SLS 2024-01-10 10:52:28 +01:00
head32.c x86/microcode/32: Move early loading after paging enable 2023-10-18 22:15:01 +02:00
head64.c x86/startup_64: Defer assignment of 5-level paging global variables 2024-03-04 18:12:06 +01:00
head_32.S x86/bugs: Rename CONFIG_PAGE_TABLE_ISOLATION => CONFIG_MITIGATION_PAGE_TABLE_ISOLATION 2024-01-10 10:52:28 +01:00
head_64.S Merge branch 'linus' into x86/boot, to resolve conflict 2024-03-12 09:55:57 +01:00
hpet.c x86/apic/msi: Use DOMAIN_BUS_GENERIC_MSI for HPET/IO-APIC domain search 2024-02-25 18:53:08 +01:00
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: 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 S390: 2024-03-15 13:03:13 -07:00
io_delay.c
ioport.c
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
irq.c x86: replace CONFIG_HAVE_KVM with IS_ENABLED(CONFIG_KVM) 2024-02-08 08:45:35 -05:00
irqflags.S x86/headers: Replace #include <asm/export.h> with #include <linux/export.h> 2023-10-03 10:38:07 +02:00
irqinit.c x86/fred: Invoke FRED initialization code to enable FRED 2024-01-31 22:03:36 +01:00
itmt.c arch/x86: Remove now superfluous sentinel elem from ctl_table arrays 2023-10-10 15:22:02 -07:00
jailhouse.c x86/jailhouse: Use new APIC registration function 2024-02-15 22:07:42 +01:00
jump_label.c
kdebugfs.c
kexec-bzimage64.c - Sumanth Korikkar has taught s390 to allocate hotplug-time page frames 2024-03-14 17:43:30 -07:00
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 - Sumanth Korikkar has taught s390 to allocate hotplug-time page frames 2024-03-14 17:43:30 -07:00
kvmclock.c kvmclock: Unexport kvmclock clocksource 2024-02-07 17:05:21 +01:00
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
machine_kexec_64.c x86, crash: wrap crash dumping code into crash related ifdefs 2024-02-23 17:48:23 -08:00
Makefile - Sumanth Korikkar has taught s390 to allocate hotplug-time page frames 2024-03-14 17:43:30 -07:00
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/mpparse: Use new APIC registration function 2024-02-15 22:07:42 +01:00
msr.c x86/MSR: make msr_class a static const structure 2023-08-05 08:31:42 +02:00
nmi_selftest.c x86/apic: Wrap IPI calls into helper functions 2023-08-09 12:00:55 -07:00
nmi.c Misc cleanups, including a large series from Thomas Gleixner to 2024-03-11 19:37:56 -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_32.c x86/fpu: Clean up FPU switching in the middle of task switching 2023-10-20 11:24:22 +02:00
process_64.c Core x86 changes for v6.9: 2024-03-11 19:53:15 -07:00
process.c Core x86 changes for v6.9: 2024-03-11 19:53:15 -07:00
process.h
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_fixups_32.c
reboot.c x86, crash: wrap crash dumping code into crash related ifdefs 2024-02-23 17:48:23 -08:00
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 rtc: Extend timeout for waiting for UIP to clear to 1s 2023-12-17 22:33:55 +01:00
setup_percpu.c x86/asm: Add DB flag to 32-bit percpu GDT entry 2023-12-20 10:57:51 +01:00
setup.c x86/cpu: Ensure that CPU info updates are propagated on UP 2024-03-23 12:22:04 +01:00
sev_verify_cbit.S x86/boot: Use 32-bit XOR to clear registers 2024-03-01 12:47:37 +01:00
sev-shared.c Merge branch 'linus' into x86/boot, to resolve conflict 2024-03-12 09:55:57 +01:00
sev.c Merge branch 'linus' into x86/boot, to resolve conflict 2024-03-12 09:55:57 +01:00
shstk.c x86/shstk: Add warning for shadow stack double unmap 2023-09-19 09:18:34 -07:00
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
signal.c rseq: Split out rseq.h from sched.h 2023-12-27 11:49:56 -05:00
smp.c - Sumanth Korikkar has taught s390 to allocate hotplug-time page frames 2024-03-14 17:43:30 -07:00
smpboot.c x86/cpu: Ensure that CPU info updates are propagated on UP 2024-03-23 12:22:04 +01:00
stacktrace.c
static_call.c x86/bugs: Rename CONFIG_RETHUNK => CONFIG_MITIGATION_RETHUNK 2024-01-10 10:52:29 +01:00
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
sys_x86_64.c x86/vdso: Move vDSO to mmap region 2024-02-27 00:23:55 +01:00
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/topology: convert to use arch_cpu_is_hotpluggable() 2023-12-06 12:41:49 +09:00
trace_clock.c
trace.c
tracepoint.c
traps.c Core x86 changes for v6.9: 2024-03-11 19:53:15 -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
tsc.c treewide: Remove system_counterval_t.cs, which is never read 2024-02-07 17:05:21 +01:00
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 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
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 Merge branch 'x86/bugs' into x86/core, to pick up pending changes before dependent patches 2024-02-14 10:49:37 +01:00
vsmp_64.c x86/apic: Remove unused phys_pkg_id() callback 2024-02-15 22:07:38 +01:00
x86_init.c x86/mpparse: Switch to new init callbacks 2024-02-15 22:07:41 +01:00