From 3c763fd77e66e55d029052da31df0abd9920cb1e Mon Sep 17 00:00:00 2001 From: Andreas Herrmann Date: Tue, 16 Dec 2008 19:07:47 +0100 Subject: [PATCH] x86: microcode_amd: fix wrong handling of equivalent CPU id Impact: fix bug resulting in non-loaded AMD microcode mc_header->processor_rev_id is a 2 byte value. Similar is true for equiv_cpu in an equiv_cpu_entry -- only 2 bytes are of interest. Signed-off-by: Andreas Herrmann Signed-off-by: Ingo Molnar --- arch/x86/kernel/microcode_amd.c | 23 ++++++----------------- 1 file changed, 6 insertions(+), 17 deletions(-) diff --git a/arch/x86/kernel/microcode_amd.c b/arch/x86/kernel/microcode_amd.c index 5f8e5d75a25..b5bc81470bc 100644 --- a/arch/x86/kernel/microcode_amd.c +++ b/arch/x86/kernel/microcode_amd.c @@ -62,7 +62,7 @@ struct microcode_header_amd { unsigned int mc_patch_data_checksum; unsigned int nb_dev_id; unsigned int sb_dev_id; - unsigned char processor_rev_id[2]; + u16 processor_rev_id; unsigned char nb_rev_id; unsigned char sb_rev_id; unsigned char bios_api_rev; @@ -125,7 +125,7 @@ static int get_matching_microcode(int cpu, void *mc, int rev) while (equiv_cpu_table[i].installed_cpu != 0) { if (current_cpu_id == equiv_cpu_table[i].installed_cpu) { - equiv_cpu_id = equiv_cpu_table[i].equiv_cpu; + equiv_cpu_id = equiv_cpu_table[i].equiv_cpu & 0xffff; break; } i++; @@ -137,21 +137,10 @@ static int get_matching_microcode(int cpu, void *mc, int rev) return 0; } - if ((mc_header->processor_rev_id[0]) != (equiv_cpu_id & 0xff)) { - printk(KERN_ERR - "microcode: CPU%d patch does not match " - "(patch is %x, cpu extended is %x) \n", - cpu, mc_header->processor_rev_id[0], - (equiv_cpu_id & 0xff)); - return 0; - } - - if ((mc_header->processor_rev_id[1]) != ((equiv_cpu_id >> 16) & 0xff)) { - printk(KERN_ERR "microcode: CPU%d patch does not match " - "(patch is %x, cpu base id is %x) \n", - cpu, mc_header->processor_rev_id[1], - ((equiv_cpu_id >> 16) & 0xff)); - + if (mc_header->processor_rev_id != equiv_cpu_id) { + printk(KERN_ERR "microcode: CPU%d patch does not match " + "(processor_rev_id: %x, eqiv_cpu_id: %x)\n", + cpu, mc_header->processor_rev_id, equiv_cpu_id); return 0; } -- 2.11.4.GIT