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x86/microcode: Update the new microcode revision unconditionally

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Handle the case where microcode gets loaded on the BSP's hyperthread
sibling first and the boot_cpu_data's microcode revision doesn't get
updated because of early exit due to the siblings sharing a microcode
engine.

For that, simply write the updated revision on all CPUs unconditionally.

Signed-off-by: Filippo Sironi <sironi@amazon.de>
Signed-off-by: Borislav Petkov <bp@suse.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: prarit@redhat.com
Cc: stable@vger.kernel.org
Link: http://lkml.kernel.org/r/1533050970-14385-1-git-send-email-sironi@amazon.de
This commit is contained in:
Filippo Sironi
2018-07-31 17:29:30 +02:00
committed by Thomas Gleixner
parent 370a132bb2
commit 8da38ebaad
2 changed files with 21 additions and 14 deletions
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13
arch/x86/kernel/cpu/microcode/intel.c
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@@ -795,6 +795,7 @@ static enum ucode_state apply_microcode_intel(int cpu)
struct ucode_cpu_info *uci = ucode_cpu_info + cpu;
struct cpuinfo_x86 *c = &cpu_data(cpu);
struct microcode_intel *mc;
enum ucode_state ret;
static int prev_rev;
u32 rev;
@@ -817,9 +818,8 @@ static enum ucode_state apply_microcode_intel(int cpu)
*/
rev = intel_get_microcode_revision();
if (rev >= mc->hdr.rev) {
uci->cpu_sig.rev = rev;
c->microcode = rev;
return UCODE_OK;
ret = UCODE_OK;
goto out;
}
/*
@@ -848,14 +848,17 @@ static enum ucode_state apply_microcode_intel(int cpu)
prev_rev = rev;
}
ret = UCODE_UPDATED;
out:
uci->cpu_sig.rev = rev;
c->microcode = rev;
c->microcode = rev;
/* Update boot_cpu_data's revision too, if we're on the BSP: */
if (c->cpu_index == boot_cpu_data.cpu_index)
boot_cpu_data.microcode = rev;
return UCODE_UPDATED;
return ret;
}
static enum ucode_state generic_load_microcode(int cpu, void *data, size_t size,