提交 777284b6 编写于 作者: B Borislav Petkov 提交者: Ingo Molnar

x86/microcode: Run the AP-loading routine only on the application processors

cpu_init() is run also on the BSP (in addition to the APs):

 x86_64_start_kernel
 |-> x86_64_start_reservations
 |-> start_kernel
 |-> trap_init
 |-> cpu_init
 |-> load_ucode_ap
 ...

but we run the AP (Application Processors) microcode loading routine
there too even though we have a BSP-specific routine for that:
load_ucode_bsp().

Which is unnecessary. So let's limit the AP microcode loading routine to
the APs only.

Remove a useless comment while at it.
Signed-off-by: NBorislav Petkov <bp@suse.de>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
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/20161025095522.11964-2-bp@alien8.deSigned-off-by: NIngo Molnar <mingo@kernel.org>
上级 9fe68cad
......@@ -1462,11 +1462,8 @@ void cpu_init(void)
*/
cr4_init_shadow();
/*
* Load microcode on this cpu if a valid microcode is available.
* This is early microcode loading procedure.
*/
load_ucode_ap();
if (cpu)
load_ucode_ap();
t = &per_cpu(cpu_tss, cpu);
oist = &per_cpu(orig_ist, cpu);
......
......@@ -357,17 +357,12 @@ static void __init get_bsp_sig(void)
#else
void load_ucode_amd_ap(void)
{
unsigned int cpu = smp_processor_id();
struct equiv_cpu_entry *eq;
struct microcode_amd *mc;
u8 *cont = container;
u32 rev, eax;
u16 eq_id;
/* Exit if called on the BSP. */
if (!cpu)
return;
if (!container)
return;
......
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