linux_old1/arch/x86/kernel/cpu
Thomas Gleixner d49597fd3b x86/cpu: Deal with broken firmware (VMWare/XEN)
Both ACPI and MP specifications require that the APIC id in the respective
tables must be the same as the APIC id in CPUID.

The kernel retrieves the physical package id from the APIC id during the
ACPI/MP table scan and builds the physical to logical package map. The
physical package id which is used after a CPU comes up is retrieved from
CPUID. So we rely on ACPI/MP tables and CPUID agreeing in that respect.

There exist VMware and XEN implementations which violate the spec. As a
result the physical to logical package map, which relies on the ACPI/MP
tables does not work on those systems, because the CPUID initialized
physical package id does not match the firmware id. This causes system
crashes and malfunction due to invalid package mappings.

The only way to cure this is to sanitize the physical package id after the
CPUID enumeration and yell when the APIC ids are different. Fix up the
initial APIC id, which is fine as it is only used printout purposes.

If the physical package IDs differ yell and use the package information
from the ACPI/MP tables so the existing logical package map just works.

Chas provided the resulting dmesg output for his affected 4 virtual
sockets, 1 core per socket VM:

[Firmware Bug]: CPU1: APIC id mismatch. Firmware: 1 CPUID: 2
[Firmware Bug]: CPU1: Using firmware package id 1 instead of 2
....

Reported-and-tested-by: "Charles (Chas) Williams" <ciwillia@brocade.com>,
Reported-by: M. Vefa Bicakci <m.v.b@runbox.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Alok Kataria <akataria@vmware.com>
Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Cc: #4.6+ <stable@vger,kernel.org>
Link: http://lkml.kernel.org/r/alpine.DEB.2.20.1611091613540.3501@nanos
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2016-11-09 21:05:01 +01:00
..
mcheck x86/mce/AMD: Extract the error address on SMCA systems 2016-09-13 15:23:13 +02:00
microcode x86/microcode/AMD: Fix more fallout from CONFIG_RANDOMIZE_MEMORY=y 2016-10-28 10:29:59 +02:00
mtrr x86: Apply more __ro_after_init and const 2016-08-10 14:55:05 +02:00
.gitignore
Makefile kernel: add kcov code coverage 2016-03-22 15:36:02 -07:00
amd.c x86/cpu/AMD: Fix cpu_llc_id for AMD Fam17h systems 2016-11-09 17:06:08 +01:00
bugs.c x86/fpu: Move various internal function prototypes to fpu/internal.h 2015-05-19 15:47:48 +02:00
bugs_64.c x86/cpu: Convert printk(KERN_<LEVEL> ...) to pr_<level>(...) 2016-02-03 10:30:03 +01:00
centaur.c Merge branch 'x86-asm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2016-03-15 09:32:27 -07:00
common.c x86/cpu: Deal with broken firmware (VMWare/XEN) 2016-11-09 21:05:01 +01:00
cpu.h x86/cpu: Restore MSR_IA32_ENERGY_PERF_BIAS after resume 2015-07-21 07:51:38 +02:00
cyrix.c x86/cpufeature: Replace cpu_has_fpu with boot_cpu_has() usage 2016-04-13 11:37:40 +02:00
hypervisor.c virt, sched: Add generic vCPU pinning support 2016-09-05 13:52:38 +02:00
intel.c Merge branch 'x86-headers-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2016-08-01 14:23:42 -04:00
intel_cacheinfo.c Merge branch 'x86-asm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2016-03-15 09:32:27 -07:00
match.c x86/kernel: Audit and remove any unnecessary uses of module.h 2016-07-14 15:06:41 +02:00
mkcapflags.sh x86/cpufeature: Carve out X86_FEATURE_* 2016-01-30 11:22:17 +01:00
mshyperv.c x86/kernel: Audit and remove any unnecessary uses of module.h 2016-07-14 15:06:41 +02:00
perfctr-watchdog.c x86/kernel: Audit and remove any unnecessary uses of module.h 2016-07-14 15:06:41 +02:00
powerflags.c x86/cpu: Add advanced power management bits 2016-03-29 11:12:11 +02:00
proc.c x86: Replace cpu_**_mask() with topology_**_cpumask() 2015-05-27 15:22:17 +02:00
rdrand.c x86, asm: Use CC_SET()/CC_OUT() and static_cpu_has() in archrandom.h 2016-06-08 12:41:20 -07:00
scattered.c x86/cpufeature: Add AVX512_4VNNIW and AVX512_4FMAPS features 2016-10-19 17:37:13 +02:00
topology.c x86/cpu: Convert printk(KERN_<LEVEL> ...) to pr_<level>(...) 2016-02-03 10:30:03 +01:00
transmeta.c Merge branch 'x86-asm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2016-03-15 09:32:27 -07:00
umc.c x86: Delete non-required instances of include <linux/init.h> 2014-01-06 21:25:18 -08:00
vmware.c x86/vmware: Skip timer_irq_works() check on VMware 2016-10-19 17:36:33 +02:00