x86/smpboot: Make logical package management more robust
commit 9d85eb9119f4eeeb48e87adfcd71f752655700e9 upstream.
The logical package management has several issues:
- The APIC ids provided by ACPI are not required to be the same as the
initial APIC id which can be retrieved by CPUID. The APIC ids provided
by ACPI are those which are written by the BIOS into the APIC. The
initial id is set by hardware and can not be changed. The hardware
provided ids contain the real hardware package information.
Especially AMD sets the effective APIC id different from the hardware id
as they need to reserve space for the IOAPIC ids starting at id 0.
As a consequence those machines trigger the currently active firmware
bug printouts in dmesg, These are obviously wrong.
- Virtual machines have their own interesting of enumerating APICs and
packages which are not reliably covered by the current implementation.
The sizing of the mapping array has been tweaked to be generously large to
handle systems which provide a wrong core count when HT is disabled so the
whole magic which checks for space in the physical hotplug case is not
needed anymore.
Simplify the whole machinery and do the mapping when the CPU starts and the
CPUID derived physical package information is available. This solves the
observed problems on AMD machines and works for the virtualization issues
as well.
Remove the extra call from XEN cpu bringup code as it is not longer
required.
Fixes: d49597fd3bc7 ("x86/cpu: Deal with broken firmware (VMWare/XEN)")
Reported-and-tested-by: Borislav Petkov <bp@suse.de>
Tested-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Juergen Gross <jgross@suse.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: M. Vefa Bicakci <m.v.b@runbox.com>
Cc: xen-devel <xen-devel@lists.xen.org>
Cc: Charles (Chas) Williams <ciwillia@brocade.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Alok Kataria <akataria@vmware.com>
Link: http://lkml.kernel.org/r/alpine.DEB.2.20.1612121102260.3429@nanos
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/arch/x86/kernel/apic/apic.c b/arch/x86/kernel/apic/apic.c
index 88c657b..f223491 100644
--- a/arch/x86/kernel/apic/apic.c
+++ b/arch/x86/kernel/apic/apic.c
@@ -2159,21 +2159,6 @@
}
/*
- * This can happen on physical hotplug. The sanity check at boot time
- * is done from native_smp_prepare_cpus() after num_possible_cpus() is
- * established.
- */
- if (topology_update_package_map(apicid, cpu) < 0) {
- int thiscpu = max + disabled_cpus;
-
- pr_warning("APIC: Package limit reached. Processor %d/0x%x ignored.\n",
- thiscpu, apicid);
-
- disabled_cpus++;
- return -ENOSPC;
- }
-
- /*
* Validate version
*/
if (version == 0x0) {
diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c
index cc9e980..c2048b4 100644
--- a/arch/x86/kernel/cpu/common.c
+++ b/arch/x86/kernel/cpu/common.c
@@ -979,29 +979,21 @@
}
/*
- * The physical to logical package id mapping is initialized from the
- * acpi/mptables information. Make sure that CPUID actually agrees with
- * that.
+ * Validate that ACPI/mptables have the same information about the
+ * effective APIC id and update the package map.
*/
-static void sanitize_package_id(struct cpuinfo_x86 *c)
+static void validate_apic_and_package_id(struct cpuinfo_x86 *c)
{
#ifdef CONFIG_SMP
- unsigned int pkg, apicid, cpu = smp_processor_id();
+ unsigned int apicid, cpu = smp_processor_id();
apicid = apic->cpu_present_to_apicid(cpu);
- pkg = apicid >> boot_cpu_data.x86_coreid_bits;
- if (apicid != c->initial_apicid) {
- pr_err(FW_BUG "CPU%u: APIC id mismatch. Firmware: %x CPUID: %x\n",
+ if (apicid != c->apicid) {
+ pr_err(FW_BUG "CPU%u: APIC id mismatch. Firmware: %x APIC: %x\n",
cpu, apicid, c->initial_apicid);
- c->initial_apicid = apicid;
}
- if (pkg != c->phys_proc_id) {
- pr_err(FW_BUG "CPU%u: Using firmware package id %u instead of %u\n",
- cpu, pkg, c->phys_proc_id);
- c->phys_proc_id = pkg;
- }
- c->logical_proc_id = topology_phys_to_logical_pkg(pkg);
+ BUG_ON(topology_update_package_map(c->phys_proc_id, cpu));
#else
c->logical_proc_id = 0;
#endif
@@ -1132,7 +1124,6 @@
#ifdef CONFIG_NUMA
numa_add_cpu(smp_processor_id());
#endif
- sanitize_package_id(c);
}
/*
@@ -1188,6 +1179,7 @@
enable_sep_cpu();
#endif
mtrr_ap_init();
+ validate_apic_and_package_id(c);
}
struct msr_range {
diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c
index 42f5eb7..e9bbe02 100644
--- a/arch/x86/kernel/smpboot.c
+++ b/arch/x86/kernel/smpboot.c
@@ -104,7 +104,6 @@
unsigned int __max_logical_packages __read_mostly;
EXPORT_SYMBOL(__max_logical_packages);
static unsigned int logical_packages __read_mostly;
-static bool logical_packages_frozen __read_mostly;
/* Maximum number of SMT threads on any online core */
int __max_smt_threads __read_mostly;
@@ -263,9 +262,14 @@
cpu_startup_entry(CPUHP_AP_ONLINE_IDLE);
}
-int topology_update_package_map(unsigned int apicid, unsigned int cpu)
+/**
+ * topology_update_package_map - Update the physical to logical package map
+ * @pkg: The physical package id as retrieved via CPUID
+ * @cpu: The cpu for which this is updated
+ */
+int topology_update_package_map(unsigned int pkg, unsigned int cpu)
{
- unsigned int new, pkg = apicid >> boot_cpu_data.x86_coreid_bits;
+ unsigned int new;
/* Called from early boot ? */
if (!physical_package_map)
@@ -278,16 +282,17 @@
if (test_and_set_bit(pkg, physical_package_map))
goto found;
- if (logical_packages_frozen) {
- physical_to_logical_pkg[pkg] = -1;
- pr_warn("APIC(%x) Package %u exceeds logical package max\n",
- apicid, pkg);
+ if (logical_packages >= __max_logical_packages) {
+ pr_warn("Package %u of CPU %u exceeds BIOS package data %u.\n",
+ logical_packages, cpu, __max_logical_packages);
return -ENOSPC;
}
new = logical_packages++;
- pr_info("APIC(%x) Converting physical %u to logical package %u\n",
- apicid, pkg, new);
+ if (new != pkg) {
+ pr_info("CPU %u Converting physical %u to logical package %u\n",
+ cpu, pkg, new);
+ }
physical_to_logical_pkg[pkg] = new;
found:
@@ -308,9 +313,9 @@
}
EXPORT_SYMBOL(topology_phys_to_logical_pkg);
-static void __init smp_init_package_map(void)
+static void __init smp_init_package_map(struct cpuinfo_x86 *c, unsigned int cpu)
{
- unsigned int ncpus, cpu;
+ unsigned int ncpus;
size_t size;
/*
@@ -355,27 +360,9 @@
size = BITS_TO_LONGS(max_physical_pkg_id) * sizeof(unsigned long);
physical_package_map = kzalloc(size, GFP_KERNEL);
- for_each_present_cpu(cpu) {
- unsigned int apicid = apic->cpu_present_to_apicid(cpu);
-
- if (apicid == BAD_APICID || !apic->apic_id_valid(apicid))
- continue;
- if (!topology_update_package_map(apicid, cpu))
- continue;
- pr_warn("CPU %u APICId %x disabled\n", cpu, apicid);
- per_cpu(x86_bios_cpu_apicid, cpu) = BAD_APICID;
- set_cpu_possible(cpu, false);
- set_cpu_present(cpu, false);
- }
-
- if (logical_packages > __max_logical_packages) {
- pr_warn("Detected more packages (%u), then computed by BIOS data (%u).\n",
- logical_packages, __max_logical_packages);
- logical_packages_frozen = true;
- __max_logical_packages = logical_packages;
- }
-
pr_info("Max logical packages: %u\n", __max_logical_packages);
+
+ topology_update_package_map(c->phys_proc_id, cpu);
}
void __init smp_store_boot_cpu_info(void)
@@ -385,7 +372,7 @@
*c = boot_cpu_data;
c->cpu_index = id;
- smp_init_package_map();
+ smp_init_package_map(c, id);
}
/*
diff --git a/arch/x86/xen/smp.c b/arch/x86/xen/smp.c
index 9fa27ce..311acad 100644
--- a/arch/x86/xen/smp.c
+++ b/arch/x86/xen/smp.c
@@ -87,12 +87,6 @@
cpu_data(cpu).x86_max_cores = 1;
set_cpu_sibling_map(cpu);
- /*
- * identify_cpu() may have set logical_pkg_id to -1 due
- * to incorrect phys_proc_id. Let's re-comupte it.
- */
- topology_update_package_map(apic->cpu_present_to_apicid(cpu), cpu);
-
xen_setup_cpu_clockevents();
notify_cpu_starting(cpu);