linux-kernel - [patch V2 01/22] x86/cpu/topology: Make the APIC mismatch warnings complete

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20240117124902.403342409@linutronix.de>
Date: Tue, 23 Jan 2024 14:10:04 +0100 (CET)
From: Thomas Gleixner <tglx@...utronix.de>
To: LKML <linux-kernel@...r.kernel.org>
Cc: x86@...nel.org,
 Tom Lendacky <thomas.lendacky@....com>,
 Andrew Cooper <andrew.cooper3@...rix.com>,
 Arjan van de Ven <arjan@...ux.intel.com>,
 Huang Rui <ray.huang@....com>,
 Juergen Gross <jgross@...e.com>,
 Dimitri Sivanich <dimitri.sivanich@....com>,
 Sohil Mehta <sohil.mehta@...el.com>,
 K Prateek Nayak <kprateek.nayak@....com>,
 Kan Liang <kan.liang@...ux.intel.com>,
 Zhang Rui <rui.zhang@...el.com>,
 "Paul E. McKenney" <paulmck@...nel.org>,
 Feng Tang <feng.tang@...el.com>,
 Andy Shevchenko <andy@...radead.org>,
 Michael Kelley <mhklinux@...look.com>,
 "Peter Zijlstra (Intel)" <peterz@...radead.org>,
 Andy Shevchenko <andy.shevchenko@...il.com>,
 Wei Liu <wei.liu@...nel.org>
Subject: [patch V2 01/22] x86/cpu/topology: Make the APIC mismatch warnings
 complete

From: Thomas Gleixner <tglx@...utronix.de>

Detect all possible combinations of mismatch right in the CPUID evaluation
code.

Signed-off-by: Thomas Gleixner <tglx@...utronix.de>

---
 arch/x86/include/asm/apic.h           |    5 ++---
 arch/x86/kernel/cpu/common.c          |   15 ++-------------
 arch/x86/kernel/cpu/topology_common.c |   12 ++++++++++++
 3 files changed, 16 insertions(+), 16 deletions(-)
---
--- a/arch/x86/include/asm/apic.h
+++ b/arch/x86/include/asm/apic.h
@@ -46,16 +46,15 @@ extern void x86_32_probe_apic(void);
 static inline void x86_32_probe_apic(void) { }
 #endif
 
-#ifdef CONFIG_X86_LOCAL_APIC
+extern u32 cpuid_to_apicid[];
 
+#ifdef CONFIG_X86_LOCAL_APIC
 extern int apic_verbosity;
 extern int local_apic_timer_c2_ok;
 
 extern bool apic_is_disabled;
 extern unsigned int lapic_timer_period;
 
-extern u32 cpuid_to_apicid[];
-
 extern enum apic_intr_mode_id apic_intr_mode;
 enum apic_intr_mode_id {
 	APIC_PIC,
--- a/arch/x86/kernel/cpu/common.c
+++ b/arch/x86/kernel/cpu/common.c
@@ -1715,22 +1715,11 @@ static void generic_identify(struct cpui
 #endif
 }
 
-/*
- * Validate that ACPI/mptables have the same information about the
- * effective APIC id and update the package map.
- */
-static void validate_apic_and_package_id(struct cpuinfo_x86 *c)
+static void update_package_map(struct cpuinfo_x86 *c)
 {
 #ifdef CONFIG_SMP
 	unsigned int cpu = smp_processor_id();
-	u32 apicid;
 
-	apicid = apic->cpu_present_to_apicid(cpu);
-
-	if (apicid != c->topo.apicid) {
-		pr_err(FW_BUG "CPU%u: APIC id mismatch. Firmware: %x APIC: %x\n",
-		       cpu, apicid, c->topo.initial_apicid);
-	}
 	BUG_ON(topology_update_package_map(c->topo.pkg_id, cpu));
 	BUG_ON(topology_update_die_map(c->topo.die_id, cpu));
 #else
@@ -1921,7 +1910,7 @@ void identify_secondary_cpu(struct cpuin
 #ifdef CONFIG_X86_32
 	enable_sep_cpu();
 #endif
-	validate_apic_and_package_id(c);
+	update_package_map(c);
 	x86_spec_ctrl_setup_ap();
 	update_srbds_msr();
 	if (boot_cpu_has_bug(X86_BUG_GDS))
--- a/arch/x86/kernel/cpu/topology_common.c
+++ b/arch/x86/kernel/cpu/topology_common.c
@@ -177,6 +177,18 @@ void cpu_parse_topology(struct cpuinfo_x
 
 	parse_topology(&tscan, false);
 
+	if (IS_ENABLED(CONFIG_X86_LOCAL_APIC)) {
+		if (c->topo.initial_apicid != c->topo.apicid) {
+			pr_err(FW_BUG "CPU%4u: APIC ID mismatch. CPUID: 0x%04x APIC: 0x%04x\n",
+			       cpu, c->topo.initial_apicid, c->topo.apicid);
+		}
+
+		if (c->topo.apicid != cpuid_to_apicid[cpu]) {
+			pr_err(FW_BUG "CPU%4u: APIC ID mismatch. Firmware: 0x%04x APIC: 0x%04x\n",
+			       cpu, cpuid_to_apicid[cpu], c->topo.apicid);
+		}
+	}
+
 	for (dom = TOPO_SMT_DOMAIN; dom < TOPO_MAX_DOMAIN; dom++) {
 		if (tscan.dom_shifts[dom] == x86_topo_system.dom_shifts[dom])
 			continue;