Commit 723f2828 authored by Borislav Petkov's avatar Borislav Petkov Committed by Ingo Molnar

x86/microcode/intel: Disable late loading on model 79

Blacklist Broadwell X model 79 for late loading due to an erratum.
Signed-off-by: default avatarBorislav Petkov <>
Acked-by: default avatarTony Luck <>
Cc: <>
Cc: Linus Torvalds <>
Cc: Peter Zijlstra <>
Cc: Thomas Gleixner <>
Link: default avatarIngo Molnar <>
parent 9c48c096
......@@ -34,6 +34,7 @@
#include <linux/mm.h>
#include <asm/microcode_intel.h>
#include <asm/intel-family.h>
#include <asm/processor.h>
#include <asm/tlbflush.h>
#include <asm/setup.h>
......@@ -918,6 +919,18 @@ static int get_ucode_fw(void *to, const void *from, size_t n)
return 0;
static bool is_blacklisted(unsigned int cpu)
struct cpuinfo_x86 *c = &cpu_data(cpu);
if (c->x86 == 6 && c->x86_model == INTEL_FAM6_BROADWELL_X) {
pr_err_once("late loading on model 79 is disabled.\n");
return true;
return false;
static enum ucode_state request_microcode_fw(int cpu, struct device *device,
bool refresh_fw)
......@@ -926,6 +939,9 @@ static enum ucode_state request_microcode_fw(int cpu, struct device *device,
const struct firmware *firmware;
enum ucode_state ret;
if (is_blacklisted(cpu))
sprintf(name, "intel-ucode/%02x-%02x-%02x",
c->x86, c->x86_model, c->x86_mask);
......@@ -950,6 +966,9 @@ static int get_ucode_user(void *to, const void *from, size_t n)
static enum ucode_state
request_microcode_user(int cpu, const void __user *buf, size_t size)
if (is_blacklisted(cpu))
return generic_load_microcode(cpu, (void *)buf, size, &get_ucode_user);
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