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Borislav Petkov f3e2a51f56 x86/microcode: Use native CPUID to tickle out microcode revision 
Intel supplies the microcode revision value in MSR 0x8b
(IA32_BIOS_SIGN_ID) after CPUID(1) has been executed. Execute it each
time before reading that MSR.

It used to do sync_core() which did do CPUID but

  c198b121b1 ("x86/asm: Rewrite sync_core() to use IRET-to-self")

changed the sync_core() implementation so we better make the microcode
loading case explicit, as the SDM documents it.

Reported-and-tested-by: Jun'ichi Nomura <j-nomura@ce.jp.nec.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Link: http://lkml.kernel.org/r/20170109114147.5082-3-bp@alien8.de
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
 		2017-01-09 23:11:14 +01:00
..
mcheck x86/mce/AMD: Make the init code more robust 2016-12-26 17:30:24 -08:00
microcode x86/microcode: Use native CPUID to tickle out microcode revision 2017-01-09 23:11:14 +01:00
mtrr x86: Apply more __ro_after_init and const 2016-08-10 14:55:05 +02:00
.gitignore
…
Makefile Merge branch 'x86-cache-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2016-12-22 09:25:45 -08:00
amd.c x86/CPU/AMD: Fix Bulldozer topology 2017-01-06 08:37:41 +01:00
bugs.c x86/cpu: Merge bugs.c and bugs_64.c 2016-10-25 11:48:50 +02:00
centaur.c Merge branch 'x86-asm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2016-03-15 09:32:27 -07:00
common.c x86/cpu: Fix bootup crashes by sanitizing the argument of the 'clearcpuid=' command-line option 2017-01-05 08:54:34 +01:00
cpu.h x86/cpu: Restore MSR_IA32_ENERGY_PERF_BIAS after resume 2015-07-21 07:51:38 +02:00
cyrix.c x86/cpufeature: Replace cpu_has_fpu with boot_cpu_has() usage 2016-04-13 11:37:40 +02:00
hypervisor.c virt, sched: Add generic vCPU pinning support 2016-09-05 13:52:38 +02:00
intel.c x86/microcode: Use native CPUID to tickle out microcode revision 2017-01-09 23:11:14 +01:00
intel_cacheinfo.c Merge branch 'x86-cache-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2016-12-22 09:25:45 -08:00
intel_rdt.c x86/intel_rdt: Add scheduler hook 2016-10-30 19:10:16 -06:00
intel_rdt_rdtgroup.c x86/intel_rdt: Implement show_options() for resctrlfs 2016-12-09 14:12:18 +01:00
intel_rdt_schemata.c x86/intel_rdt: Add schemata file 2016-10-30 19:10:16 -06:00
match.c x86/kernel: Audit and remove any unnecessary uses of module.h 2016-07-14 15:06:41 +02:00
mkcapflags.sh x86/cpufeature: Carve out X86_FEATURE_* 2016-01-30 11:22:17 +01:00
mshyperv.c clocksource: Use a plain u64 instead of cycle_t 2016-12-25 11:04:12 +01:00
perfctr-watchdog.c x86/kernel: Audit and remove any unnecessary uses of module.h 2016-07-14 15:06:41 +02:00
powerflags.c x86/cpu: Add advanced power management bits 2016-03-29 11:12:11 +02:00
proc.c x86: Replace cpu_**_mask() with topology_**_cpumask() 2015-05-27 15:22:17 +02:00
rdrand.c x86, asm: Use CC_SET()/CC_OUT() and static_cpu_has() in archrandom.h 2016-06-08 12:41:20 -07:00
scattered.c Merge branch 'x86/cpufeature' into x86/cache 2016-11-16 14:19:34 +01:00
topology.c x86/cpu: Convert printk(KERN_<LEVEL> ...) to pr_<level>(...) 2016-02-03 10:30:03 +01:00
transmeta.c Merge branch 'x86-asm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2016-03-15 09:32:27 -07:00
umc.c x86: Delete non-required instances of include <linux/init.h> 2014-01-06 21:25:18 -08:00
vmware.c Merge branch 'x86-platform-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2016-12-12 15:29:06 -08:00