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

Blacklist Broadwell X model 79 for late loading due to an erratum.

Signed-off-by: Borislav Petkov <bp@suse.de>
Acked-by: Tony Luck <tony.luck@intel.com>
Cc: <stable@vger.kernel.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/20171018111225.25635-1-bp@alien8.de
Signed-off-by: Ingo Molnar <mingo@kernel.org>
lynxis/untested/v4.19.128
Borislav Petkov 4 years ago
committed by Ingo Molnar
parent
commit
723f2828a9
  1. 19
      arch/x86/kernel/cpu/microcode/intel.c

19
arch/x86/kernel/cpu/microcode/intel.c

@ -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))
return UCODE_NFOUND;
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 UCODE_NFOUND;
return generic_load_microcode(cpu, (void *)buf, size, &get_ucode_user);
}

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