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Bae" , Arjan van de Ven , Nikolay Borisov Subject: [patch V3 08/30] x86/microcode/intel: Save the microcode only after a successful late-load References: <20230912065249.695681286@linutronix.de> MIME-Version: 1.0 Date: Tue, 12 Sep 2023 09:57:56 +0200 (CEST) Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" From: Thomas Gleixner There are situations where the late microcode is loaded into memory, but is not applied: 1) The rendevouz fails 2) The microcode is rejected by the CPUs If any of this happens then the pointer which was updated at firmware load time is stale and subsequent CPU hotplug operations either fail to update or create inconsistent microcode state. Save the loaded microcode in a separate pointer from with the late load is attempted and when successful, update the hotplug pointer accordingly via a new micrcode_ops callback. Remove the pointless fallback in the loader to a microcode pointer which is never populated. Signed-off-by: Thomas Gleixner --- arch/x86/kernel/cpu/microcode/core.c | 4 ++++ arch/x86/kernel/cpu/microcode/intel.c | 30 +++++++++++++++-----------= ---- arch/x86/kernel/cpu/microcode/internal.h | 1 + 3 files changed, 20 insertions(+), 15 deletions(-) --- --- a/arch/x86/kernel/cpu/microcode/core.c +++ b/arch/x86/kernel/cpu/microcode/core.c @@ -400,6 +400,10 @@ static int microcode_reload_late(void) store_cpu_caps(&prev_info); =20 ret =3D stop_machine_cpuslocked(__reload_late, NULL, cpu_online_mask); + + if (microcode_ops->finalize_late_load) + microcode_ops->finalize_late_load(ret); + if (!ret) { pr_info("Reload succeeded, microcode revision: 0x%x -> 0x%x\n", old, boot_cpu_data.microcode); --- a/arch/x86/kernel/cpu/microcode/intel.c +++ b/arch/x86/kernel/cpu/microcode/intel.c @@ -34,6 +34,7 @@ static const char ucode_path[] =3D "kernel =20 /* Current microcode patch used in early patching on the APs. */ static struct microcode_intel *ucode_patch_va __read_mostly; +static struct microcode_intel *ucode_patch_late __read_mostly; =20 /* last level cache size per core */ static unsigned int llc_size_per_core __ro_after_init; @@ -461,12 +462,9 @@ static enum ucode_state apply_microcode_ if (WARN_ON(raw_smp_processor_id() !=3D cpu)) return UCODE_ERROR; =20 - mc =3D ucode_patch_va; - if (!mc) { - mc =3D uci->mc; - if (!mc) - return UCODE_NFOUND; - } + mc =3D ucode_patch_late; + if (!mc) + return UCODE_NFOUND; =20 /* * Save us the MSR write below - which is a particular expensive @@ -585,15 +583,7 @@ static enum ucode_state parse_microcode_ if (!new_mc) return UCODE_NFOUND; =20 - /* Save for CPU hotplug */ - save_microcode_patch((struct microcode_intel *)new_mc); - uci->mc =3D ucode_patch_va; - - vfree(new_mc); - - pr_debug("CPU%d found a matching microcode update with version 0x%x (curr= ent=3D0x%x)\n", - cpu, cur_rev, uci->cpu_sig.rev); - + ucode_patch_late =3D (struct microcode_intel *)new_mc; return UCODE_NEW; } =20 @@ -650,10 +640,20 @@ static enum ucode_state request_microcod return ret; } =20 +static void finalize_late_load(int result) +{ + if (!result) + save_microcode_patch(ucode_patch_late); + + vfree(ucode_patch_late); + ucode_patch_late =3D NULL; +} + static struct microcode_ops microcode_intel_ops =3D { .request_microcode_fw =3D request_microcode_fw, .collect_cpu_info =3D collect_cpu_info, .apply_microcode =3D apply_microcode_intel, + .finalize_late_load =3D finalize_late_load, }; =20 static __init void calc_llc_size_per_core(struct cpuinfo_x86 *c) --- a/arch/x86/kernel/cpu/microcode/internal.h +++ b/arch/x86/kernel/cpu/microcode/internal.h @@ -31,6 +31,7 @@ struct microcode_ops { */ enum ucode_state (*apply_microcode)(int cpu); int (*collect_cpu_info)(int cpu, struct cpu_signature *csig); + void (*finalize_late_load)(int result); }; =20 extern struct ucode_cpu_info ucode_cpu_info[];