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authorBorislav Petkov <bp@suse.de>2018-02-28 11:28:44 +0100
committerThomas Gleixner <tglx@linutronix.de>2018-03-08 10:19:26 +0100
commitd8c3b52c00a05036e0a6b315b4b17921a7b67997 (patch)
tree08c87d0ddebfdb201d7159673361fb13aaabfb95 /arch
parent30ec26da9967d0d785abc24073129a34c3211777 (diff)
downloadlinux-d8c3b52c00a05036e0a6b315b4b17921a7b67997.tar.bz2
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
Diffstat (limited to 'arch')
-rw-r--r--arch/x86/kernel/cpu/microcode/intel.c11
1 files changed, 5 insertions, 6 deletions
diff --git a/arch/x86/kernel/cpu/microcode/intel.c b/arch/x86/kernel/cpu/microcode/intel.c
index e2864bc2d575..2aded9db1d42 100644
--- a/arch/x86/kernel/cpu/microcode/intel.c
+++ b/arch/x86/kernel/cpu/microcode/intel.c
@@ -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;
+ /* Look for a newer patch in our cache: */
+ mc = find_patch(uci);
if (!mc) {
- /* Look for a newer patch in our cache: */
- mc = find_patch(uci);
+ mc = uci->mc;
if (!mc)
return UCODE_NFOUND;
}