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x86/microcode/intel: Look into the patch cache first 

The cache might contain a newer patch - look in there first.

A follow-on change will make sure newest patches are loaded into the
cache of microcode patches.

Signed-off-by: Borislav Petkov <bp@suse.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Tested-by: Tom Lendacky <thomas.lendacky@amd.com>
Tested-by: Ashok Raj <ashok.raj@intel.com>
Cc: Arjan Van De Ven <arjan.van.de.ven@intel.com>
Link: https://lkml.kernel.org/r/20180228102846.13447-6-bp@alien8.de
This commit is contained in:
Borislav Petkov 2018-02-28 11:28:44 +01:00 committed by Thomas Gleixner
parent 30ec26da99
commit d8c3b52c00
1 changed files with 5 additions and 6 deletions
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9
arch/x86/kernel/cpu/microcode/intel.c
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@ -791,9 +791,9 @@ static int collect_cpu_info(int cpu_num, struct cpu_signature *csig)
static enum ucode_state apply_microcode_intel(int cpu)
{
struct microcode_intel *mc;
struct ucode_cpu_info *uci;
struct ucode_cpu_info *uci = ucode_cpu_info + cpu;
struct cpuinfo_x86 *c = &cpu_data(cpu);
struct microcode_intel *mc;
static int prev_rev;
u32 rev;
@ -801,11 +801,10 @@ static enum ucode_state apply_microcode_intel(int cpu)
if (WARN_ON(raw_smp_processor_id() != cpu))
return UCODE_ERROR;
uci = ucode_cpu_info + cpu;
mc = uci->mc;
if (!mc) {
/* Look for a newer patch in our cache: */
mc = find_patch(uci);
if (!mc) {
mc = uci->mc;
if (!mc)
return UCODE_NFOUND;
}