[PATCH 2/2] Fixed broken microcode early loading on 32 bit platforms because it always jumps past cpuid in sync_core() as data structure boot_cpu_data are not populated so early in boot. This is for 4.4. Should be done for 4.9 too
From: Evalds Iodzevics
Date: Sun Apr 19 2020 - 12:29:51 EST
---
arch/x86/include/asm/microcode_intel.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/x86/include/asm/microcode_intel.h b/arch/x86/include/asm/microcode_intel.h
index 90343ba50485..92ce9c8a508b 100644
--- a/arch/x86/include/asm/microcode_intel.h
+++ b/arch/x86/include/asm/microcode_intel.h
@@ -60,7 +60,7 @@ static inline u32 intel_get_microcode_revision(void)
native_wrmsrl(MSR_IA32_UCODE_REV, 0);
/* As documented in the SDM: Do a CPUID 1 here */
- sync_core();
+ native_cpuid_eax(1);
/* get the current revision from MSR 0x8B */
native_rdmsr(MSR_IA32_UCODE_REV, dummy, rev);
--
2.17.4