diff options
| author | Borislav Petkov <borislav.petkov@amd.com> | 2012-07-25 20:06:54 +0200 |
|---|---|---|
| committer | H. Peter Anvin <hpa@linux.intel.com> | 2012-08-23 01:15:50 +0200 |
| commit | 5f5b747282c6cc57b91baba37f76de27398b9e60 (patch) | |
| tree | a741c6bf98fb9dfe3d83833b1b279381ceb55db3 /arch/x86 | |
| parent | x86, microcode, AMD: Check before applying a patch (diff) | |
| download | linux-5f5b747282c6cc57b91baba37f76de27398b9e60.tar.xz linux-5f5b747282c6cc57b91baba37f76de27398b9e60.zip | |
x86, microcode, AMD: Read CPUID(1).EAX on the correct cpu
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 <borislav.petkov@amd.com>
Link: http://lkml.kernel.org/r/1344361461-10076-9-git-send-email-bp@amd64.org
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
Diffstat (limited to 'arch/x86')
| -rw-r--r-- | arch/x86/kernel/microcode_amd.c | 12 |
1 files 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; |