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x86/microcode/intel: Unify microcode apply() functions

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Deduplicate the early and late apply() functions.

  [ bp: Rename the function which does the actual application to
      __apply_microcode() to differentiate it from
      microcode_ops.apply_microcode(). ]

Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/20231017211722.795508212@linutronix.de
This commit is contained in:
Thomas Gleixner 2023-10-17 23:23:44 +02:00 committed by Borislav Petkov (AMD)
parent f24f204405
commit 3973718cff
1 changed files with 36 additions and 68 deletions
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104
arch/x86/kernel/cpu/microcode/intel.c
View file

@ -307,12 +307,12 @@ static __init struct microcode_intel *scan_microcode(void *data, size_t size,
return size ? NULL : patch;
}
static enum ucode_state apply_microcode_early(struct ucode_cpu_info *uci)
static enum ucode_state __apply_microcode(struct ucode_cpu_info *uci,
struct microcode_intel *mc,
u32 *cur_rev)
{
struct microcode_intel *mc;
u32 rev, old_rev, date;
u32 rev;
mc = uci->mc;
if (!mc)
return UCODE_NFOUND;
@ -321,14 +321,12 @@ static enum ucode_state apply_microcode_early(struct ucode_cpu_info *uci)
* operation - when the other hyperthread has updated the microcode
* already.
*/
rev = intel_get_microcode_revision();
if (rev >= mc->hdr.rev) {
uci->cpu_sig.rev = rev;
*cur_rev = intel_get_microcode_revision();
if (*cur_rev >= mc->hdr.rev) {
uci->cpu_sig.rev = *cur_rev;
return UCODE_OK;
}
old_rev = rev;
/*
* Writeback and invalidate caches before updating microcode to avoid
* internal issues depending on what the microcode is updating.
@ -343,13 +341,24 @@ static enum ucode_state apply_microcode_early(struct ucode_cpu_info *uci)
return UCODE_ERROR;
uci->cpu_sig.rev = rev;
date = mc->hdr.date;
pr_info_once("updated early: 0x%x -> 0x%x, date = %04x-%02x-%02x\n",
old_rev, rev, date & 0xffff, date >> 24, (date >> 16) & 0xff);
return UCODE_UPDATED;
}
static enum ucode_state apply_microcode_early(struct ucode_cpu_info *uci)
{
struct microcode_intel *mc = uci->mc;
enum ucode_state ret;
u32 cur_rev, date;
ret = __apply_microcode(uci, mc, &cur_rev);
if (ret == UCODE_UPDATED) {
date = mc->hdr.date;
pr_info_once("updated early: 0x%x -> 0x%x, date = %04x-%02x-%02x\n",
cur_rev, mc->hdr.rev, date & 0xffff, date >> 24, (date >> 16) & 0xff);
}
return ret;
}
static __init bool load_builtin_intel_microcode(struct cpio_data *cp)
{
unsigned int eax = 1, ebx, ecx = 0, edx;
@ -459,70 +468,29 @@ static int collect_cpu_info(int cpu_num, struct cpu_signature *csig)
return 0;
}
static enum ucode_state apply_microcode_intel(int cpu)
static enum ucode_state apply_microcode_late(int cpu)
{
struct ucode_cpu_info *uci = ucode_cpu_info + cpu;
struct cpuinfo_x86 *c = &cpu_data(cpu);
bool bsp = c->cpu_index == boot_cpu_data.cpu_index;
struct microcode_intel *mc;
struct microcode_intel *mc = ucode_patch_late;
enum ucode_state ret;
static int prev_rev;
u32 rev;
u32 cur_rev;
/* We should bind the task to the CPU */
if (WARN_ON(raw_smp_processor_id() != cpu))
if (WARN_ON_ONCE(smp_processor_id() != cpu))
return UCODE_ERROR;
mc = ucode_patch_late;
if (!mc)
return UCODE_NFOUND;
ret = __apply_microcode(uci, mc, &cur_rev);
if (ret != UCODE_UPDATED && ret != UCODE_OK)
return ret;
/*
* Save us the MSR write below - which is a particular expensive
* operation - when the other hyperthread has updated the microcode
* already.
*/
rev = intel_get_microcode_revision();
if (rev >= mc->hdr.rev) {
ret = UCODE_OK;
goto out;
}
/*
* Writeback and invalidate caches before updating microcode to avoid
* internal issues depending on what the microcode is updating.
*/
native_wbinvd();
/* write microcode via MSR 0x79 */
wrmsrl(MSR_IA32_UCODE_WRITE, (unsigned long)mc->bits);
rev = intel_get_microcode_revision();
if (rev != mc->hdr.rev) {
pr_err("CPU%d update to revision 0x%x failed\n",
cpu, mc->hdr.rev);
return UCODE_ERROR;
}
if (bsp && rev != prev_rev) {
pr_info("updated to revision 0x%x, date = %04x-%02x-%02x\n",
rev,
mc->hdr.date & 0xffff,
mc->hdr.date >> 24,
if (!cpu && uci->cpu_sig.rev != cur_rev) {
pr_info("Updated to revision 0x%x, date = %04x-%02x-%02x\n",
uci->cpu_sig.rev, mc->hdr.date & 0xffff, mc->hdr.date >> 24,
(mc->hdr.date >> 16) & 0xff);
prev_rev = rev;
}
ret = UCODE_UPDATED;
out:
uci->cpu_sig.rev = rev;
c->microcode = rev;
/* Update boot_cpu_data's revision too, if we're on the BSP: */
if (bsp)
boot_cpu_data.microcode = rev;
cpu_data(cpu).microcode = uci->cpu_sig.rev;
if (!cpu)
boot_cpu_data.microcode = uci->cpu_sig.rev;
return ret;
}
@ -663,7 +631,7 @@ static void finalize_late_load(int result)
static struct microcode_ops microcode_intel_ops = {
.request_microcode_fw = request_microcode_fw,
.collect_cpu_info = collect_cpu_info,
.apply_microcode = apply_microcode_intel,
.apply_microcode = apply_microcode_late,
.finalize_late_load = finalize_late_load,
};