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Star64_linux/arch/x86/kernel
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Thomas Lendacky 912139cfbf x86/microcode/amd: Don't falsely trick the late loading mechanism 
The load_microcode_amd() function searches for microcode patches and
attempts to apply a microcode patch if it is of different level than the
currently installed level.

While the processor won't actually load a level that is less than
what is already installed, the logic wrongly returns UCODE_NEW thus
signaling to its caller reload_store() that a late loading should be
attempted.

If the file-system contains an older microcode revision than what is
currently running, such a late microcode reload can result in these
misleading messages:

  x86/CPU: CPU features have changed after loading microcode, but might not take effect.
  x86/CPU: Please consider either early loading through initrd/built-in or a potential BIOS update.

These messages were issued on a system where SME/SEV are not
enabled by the BIOS (MSR C001_0010[23] = 0b) because during boot,
early_detect_mem_encrypt() is called and cleared the SME and SEV
features in this case.

However, after the wrong late load attempt, get_cpu_cap() is called and
reloads the SME and SEV feature bits, resulting in the messages.

Update the microcode level check to not attempt microcode loading if the
current level is greater than(!) and not only equal to the current patch
level.

 [ bp: massage commit message. ]

Fixes: 2613f36ed9 ("x86/microcode: Attempt late loading only when new microcode is present")
Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: x86-ml <x86@kernel.org>
Link: https://lkml.kernel.org/r/154894518427.9406.8246222496874202773.stgit@tlendack-t1.amdoffice.net
2019-01-31 16:54:32 +01:00
..
acpi x86: Fix various typos in comments 2018-12-03 10:49:13 +01:00
apic x86/kernel: Fix more -Wmissing-prototypes warnings 2018-12-08 12:24:35 +01:00
cpu x86/microcode/amd: Don't falsely trick the late loading mechanism 2019-01-31 16:54:32 +01:00
fpu Remove 'type' argument from access_ok() function 2019-01-03 18:57:57 -08:00
kprobes Merge branch 'x86-cleanups-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2018-12-26 17:03:51 -08:00
.gitignore
alternative.c Merge branch 'x86-paravirt-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2018-10-23 17:54:58 +01:00
amd_gart_64.c x86/amd_gart: fix unmapping of non-GART mappings 2019-01-05 08:27:32 +01:00
amd_nb.c x86/amd_nb: Add PCI device IDs for family 17h, model 30h 2018-11-07 21:36:09 +01:00
apb_timer.c
aperture_64.c x86/gart: Rewrite early_gart_iommu_check() comment 2018-11-05 21:18:31 +01:00
apm_32.c x86/APM: Fix build warning when PROC_FS is not enabled 2018-09-15 10:16:25 +02:00
asm-offsets.c x86/kernel: Fix more -Wmissing-prototypes warnings 2018-12-08 12:24:35 +01:00
asm-offsets_32.c
asm-offsets_64.c x86/paravirt: Move the pv_irq_ops under the PARAVIRT_XXL umbrella 2018-09-03 16:50:36 +02:00
audit_64.c
bootflag.c
check.c x86/headers: Fix -Wmissing-prototypes warning 2018-11-23 07:59:59 +01:00
cpuid.c
crash.c x86/kexec: Fix a kexec_file_load() failure 2019-01-15 12:12:50 +01:00
crash_dump_32.c
crash_dump_64.c x86: Fix various typos in comments 2018-12-03 10:49:13 +01:00
devicetree.c x86/headers: Fix -Wmissing-prototypes warning 2018-11-23 07:59:59 +01:00
doublefault.c
dumpstack.c x86/process: Don't mix user/kernel regs in 64bit __show_regs() 2018-09-06 14:33:12 +02:00
dumpstack_32.c
dumpstack_64.c
e820.c memblock: stop using implicit alignment to SMP_CACHE_BYTES 2018-10-31 08:54:16 -07:00
early-quirks.c
early_printk.c x86/earlyprintk: Add a force option for pciserial device 2018-10-02 21:02:47 +02:00
ebda.c
eisa.c x86/EISA: Don't probe EISA bus for Xen PV guests 2018-09-11 23:36:50 +02:00
espfix_64.c
ftrace.c x86/ftrace: Do not call function graph from dynamic trampolines 2018-12-19 22:43:37 -05:00
ftrace_32.S
ftrace_64.S x86/ftrace: Do not call function graph from dynamic trampolines 2018-12-19 22:43:37 -05:00
head32.c x86/boot: Mostly revert commit ae7e1238e6 ("Add ACPI RSDP address to setup_header") 2018-11-20 09:43:10 +01:00
head64.c x86/boot: Mostly revert commit ae7e1238e6 ("Add ACPI RSDP address to setup_header") 2018-11-20 09:43:10 +01:00
head_32.S
head_64.S xen/pvh: Split CONFIG_XEN_PVH into CONFIG_PVH and CONFIG_XEN_PVH 2018-12-13 13:41:49 -05:00
hpet.c
hw_breakpoint.c
i8237.c
i8253.c
i8259.c
idt.c
ima_arch.c x86/ima: retry detecting secure boot mode 2018-12-11 07:19:45 -05:00
io_delay.c
ioport.c
irq.c
irq_32.c
irq_64.c
irq_work.c
irqflags.S
irqinit.c
itmt.c
jailhouse.c x86/headers: Fix -Wmissing-prototypes warning 2018-11-23 07:59:59 +01:00
jump_label.c jump_label: move 'asm goto' support test to Kconfig 2019-01-06 09:46:51 +09:00
kdebugfs.c
kexec-bzimage64.c x86/kexec: Fix a kexec_file_load() failure 2019-01-15 12:12:50 +01:00
kgdb.c kgdb/treewide: constify struct kgdb_arch arch_kgdb_ops 2018-12-30 08:33:06 +00:00
ksysfs.c
kvm.c x86/paravirt: Use a single ops structure 2018-09-03 16:50:35 +02:00
kvmclock.c x86/kvmclock: convert to SPDX identifiers 2018-12-21 11:28:25 +01:00
ldt.c x86/ldt: Remove unused variable in map_ldt_struct() 2018-11-06 21:35:11 +01:00
livepatch.c
machine_kexec_32.c
machine_kexec_64.c
Makefile jump_label: move 'asm goto' support test to Kconfig 2019-01-06 09:46:51 +09:00
mmconf-fam10h_64.c
module.c x86: Add support for 64-bit place relative relocations 2018-09-27 17:56:47 +02:00
mpparse.c mm: remove include/linux/bootmem.h 2018-10-31 08:54:16 -07:00
msr.c x86: Clean up 'sizeof x' => 'sizeof(x)' 2018-10-29 07:13:28 +01:00
nmi.c
nmi_selftest.c
paravirt-spinlocks.c x86/paravirt: Use a single ops structure 2018-09-03 16:50:35 +02:00
paravirt.c x86/paravirt: Remove unused _paravirt_ident_32 2018-10-30 09:55:31 +01:00
paravirt_patch_32.c x86/paravirt: Remove unused _paravirt_ident_32 2018-10-30 09:55:31 +01:00
paravirt_patch_64.c x86/paravirt: Remove unused _paravirt_ident_32 2018-10-30 09:55:31 +01:00
pci-calgary_64.c x86/calgary: remove the mapping_error dma_map_ops method 2018-12-06 06:56:46 -08:00
pci-dma.c dma-mapping: bypass indirect calls for dma-direct 2018-12-13 21:06:18 +01:00
pci-iommu_table.c
pci-swiotlb.c dma-direct: merge swiotlb_dma_ops into the dma_direct code 2018-12-13 21:06:17 +01:00
pcspeaker.c
perf_regs.c
platform-quirks.c
pmem.c
probe_roms.c
process.c Linux 4.20-rc5 2018-12-03 10:47:53 +01:00
process.h x86/speculation: Change misspelled STIPB to STIBP 2018-12-06 11:49:15 +01:00
process_32.c Merge branch 'x86-fpu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2018-12-26 17:37:51 -08:00
process_64.c Merge branch 'x86-mm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2018-12-26 18:08:18 -08:00
ptrace.c x86/fsgsbase/64: Fix the base write helper functions 2018-12-18 14:26:09 +01:00
pvclock.c mm: remove include/linux/bootmem.h 2018-10-31 08:54:16 -07:00
quirks.c x86/headers: Fix -Wmissing-prototypes warning 2018-11-23 07:59:59 +01:00
reboot.c
reboot_fixups_32.c
relocate_kernel_32.S
relocate_kernel_64.S
resource.c
rtc.c
setup.c Merge branch 'mount.part1' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2019-01-05 13:25:58 -08:00
setup_percpu.c mm: remove include/linux/bootmem.h 2018-10-31 08:54:16 -07:00
signal.c Remove 'type' argument from access_ok() function 2019-01-03 18:57:57 -08:00
signal_compat.c
smp.c
smpboot.c x86/topology: Use total_cpus for max logical packages calculation 2018-12-18 13:38:37 +01:00
stacktrace.c Remove 'type' argument from access_ok() function 2019-01-03 18:57:57 -08:00
step.c
sys_x86_64.c x86/compat: Adjust in_compat_syscall() to generic code under !COMPAT 2018-11-01 12:59:25 +01:00
sysfb.c
sysfb_efi.c x86/kernel: Fix more -Wmissing-prototypes warnings 2018-12-08 12:24:35 +01:00
sysfb_simplefb.c
tboot.c iommu/vtd: Cleanup dma_remapping.h header 2018-11-12 14:22:56 +01:00
tce_64.c mm: remove include/linux/bootmem.h 2018-10-31 08:54:16 -07:00
time.c Merge branch 'x86-vdso-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2018-10-23 19:07:25 +01:00
tls.c
tls.h
topology.c x86/xen: Disable CPU0 hotplug for Xen PV 2018-09-12 21:15:02 +02:00
trace_clock.c
tracepoint.c x86/kernel: Fix more -Wmissing-prototypes warnings 2018-12-08 12:24:35 +01:00
traps.c x86/traps: Use format string with panic() call 2018-10-29 07:19:26 +01:00
tsc.c Merge branch 'x86-paravirt-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2018-10-23 17:54:58 +01:00
tsc_msr.c x86/cpu: Sanitize FAM6_ATOM naming 2018-10-02 10:14:32 +02:00
tsc_sync.c
umip.c signal/x86: Use force_sig_fault where appropriate 2018-09-21 15:30:54 +02:00
unwind_frame.c
unwind_guess.c
unwind_orc.c
uprobes.c signal: Properly deliver SIGSEGV from x86 uprobes 2018-09-11 21:18:53 +02:00
verify_cpu.S
vm86_32.c Remove 'type' argument from access_ok() function 2019-01-03 18:57:57 -08:00
vmlinux.lds.S Merge branch 'x86-pti-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2018-10-23 18:43:04 +01:00
vsmp_64.c x86/vsmp: Remove dependency on pv_irq_ops 2018-11-06 21:35:11 +01:00
x86_init.c x86/acpi, x86/boot: Take RSDP address for boot params if available 2018-10-10 10:44:22 +02:00