From: Borislav Petkov <[email protected]> Read the CPUID(1).EAX leaf at the correct cpu and use it to search the equivalence table for matching microcode patch. No functionality change.
Signed-off-by: Borislav Petkov <[email protected]> --- arch/x86/kernel/microcode_amd.c | 12 ++++++------ 1 file changed, 6 insertions(+), 6 deletions(-) diff --git a/arch/x86/kernel/microcode_amd.c b/arch/x86/kernel/microcode_amd.c index 8fdf7d99b804..25d34b177482 100644 --- a/arch/x86/kernel/microcode_amd.c +++ b/arch/x86/kernel/microcode_amd.c @@ -82,6 +82,7 @@ static int collect_cpu_info_amd(int cpu, struct cpu_signature *csig) { struct cpuinfo_x86 *c = &cpu_data(cpu); + csig->sig = cpuid_eax(0x00000001); csig->rev = c->microcode; pr_info("CPU%d: patch_level=0x%08x\n", cpu, csig->rev); @@ -118,16 +119,15 @@ static unsigned int verify_ucode_size(int cpu, u32 patch_size, return patch_size; } -static u16 find_equiv_id(void) +static u16 find_equiv_id(unsigned int cpu) { - unsigned int current_cpu_id, i = 0; + struct ucode_cpu_info *uci = ucode_cpu_info + cpu; + int i = 0; BUG_ON(equiv_cpu_table == NULL); - current_cpu_id = cpuid_eax(0x00000001); - while (equiv_cpu_table[i].installed_cpu != 0) { - if (current_cpu_id == equiv_cpu_table[i].installed_cpu) + if (uci->cpu_sig.sig == equiv_cpu_table[i].installed_cpu) return equiv_cpu_table[i].equiv_cpu; i++; @@ -150,7 +150,7 @@ static int get_matching_microcode(int cpu, const u8 *ucode_ptr, patch_size = *(u32 *)(ucode_ptr + 4); *current_size = patch_size + SECTION_HDR_SIZE; - equiv_cpu_id = find_equiv_id(); + equiv_cpu_id = find_equiv_id(cpu); if (!equiv_cpu_id) return 0; -- 1.7.11.rc1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
