From: Thomas Gleixner <tglx@linutronix.de>
To: "Zhang, Rui" <rui.zhang@intel.com>,
"Brown, Len" <len.brown@intel.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Cc: "jgross@suse.com" <jgross@suse.com>,
"x86@kernel.org" <x86@kernel.org>,
"arjan@linux.intel.com" <arjan@linux.intel.com>,
"kprateek.nayak@amd.com" <kprateek.nayak@amd.com>,
"Tang, Feng" <feng.tang@intel.com>,
"kan.liang@linux.intel.com" <kan.liang@linux.intel.com>,
"thomas.lendacky@amd.com" <thomas.lendacky@amd.com>,
"ray.huang@amd.com" <ray.huang@amd.com>,
"andrew.cooper3@citrix.com" <andrew.cooper3@citrix.com>,
"Sivanich, Dimitri" <dimitri.sivanich@hpe.com>,
"paulmck@kernel.org" <paulmck@kernel.org>,
"Mehta, Sohil" <sohil.mehta@intel.com>,
"andy@infradead.org" <andy@infradead.org>
Subject: Re: [patch 37/53] x86/cpu: Detect real BSP on crash kernels
Date: Mon, 15 Jan 2024 10:41:49 +0100 [thread overview]
Message-ID: <87a5p7gcgy.ffs@tglx> (raw)
In-Reply-To: <365568d9441d74516d0bfb802018ee0943b1b94b.camel@intel.com>
On Sat, Jan 13 2024 at 07:35, Zhang, Rui wrote:
> On Fri, 2024-01-12 at 16:39 +0100, Thomas Gleixner wrote:
>> It brings the effect that we can detect when we are not booting
>> (kexec
>> case) on the actual boot CPU because then the first enumerated APIC
>> ID
>> is not the same as the boot CPU APIC ID. No?
>
> Right.
> I was thinking in the way this patch series does, which just compares
> the boot CPU APIC ID and the lowest numbered APIC ID.
Yes, that's obviously not working when the lowest APIC ID is not the
actual boot CPU.
>> I agree that MADT is error prone too given the fact that not even
>> Intel
>> can get it right....
>
> For this MTL, I can raise an internal ticket to get it right.
>
> Are there quite some platforms with BSP not listed as the first entry
> in MADT?
> if so, we still have to live with the kexec boot parameter? :)
I haven't found one yet, but you might look through the P/E systems to
get a picture.
next prev parent reply other threads:[~2024-01-15 9:41 UTC|newest]
Thread overview: 98+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-08-07 13:52 [patch 00/53] x86/topology: The final installment Thomas Gleixner
2023-08-07 13:52 ` [patch 01/53] x86/cpu/topology: Cure off by one in fake_topology() Thomas Gleixner
2023-08-07 13:52 ` [patch 02/53] x86/cpu/topology: Make the APIC mismatch warnings complete Thomas Gleixner
2023-08-07 14:28 ` Arjan van de Ven
2023-08-07 14:54 ` Thomas Gleixner
2023-08-07 13:52 ` [patch 03/53] x86/platform/ce4100: Dont override x86_init.mpparse.setup_ioapic_ids Thomas Gleixner
2023-08-07 15:20 ` Andy Shevchenko
2023-08-07 13:52 ` [patch 04/53] x86/ioapic: Replace some more set bit nonsense Thomas Gleixner
2023-08-07 13:52 ` [patch 05/53] x86/apic: Get rid of get_physical_broadcast() Thomas Gleixner
2023-08-07 15:24 ` Andy Shevchenko
2023-08-07 13:52 ` [patch 06/53] x86/ioapic: Make io_apic_get_unique_id() simpler Thomas Gleixner
2023-08-07 13:52 ` [patch 07/53] x86/ioapic: Simplify setup_ioapic_ids_from_mpc_nocheck() Thomas Gleixner
2023-08-07 13:52 ` [patch 08/53] x86/apic: Remove check_apicid_used() and ioapic_phys_id_map() Thomas Gleixner
2023-08-07 13:52 ` [patch 09/53] x86/mpparse: Rename default_find_smp_config() Thomas Gleixner
2023-08-07 16:03 ` Andy Shevchenko
2023-08-07 17:21 ` Thomas Gleixner
2023-08-07 13:52 ` [patch 10/53] x86/mpparse: Provide separate early/late callbacks Thomas Gleixner
2023-08-07 13:52 ` [patch 11/53] x86/mpparse: Prepare for callback separation Thomas Gleixner
2023-08-07 13:52 ` [patch 12/53] x86/dtb: Rename x86_dtb_init() Thomas Gleixner
2023-08-07 13:52 ` [patch 13/53] x86/platform/ce4100: Prepare for separate mpparse callbacks Thomas Gleixner
2023-08-07 13:52 ` [patch 14/53] x86/platform/intel-mid: " Thomas Gleixner
2023-08-07 16:07 ` Andy Shevchenko
2023-08-07 13:52 ` [patch 15/53] x86/jailhouse: " Thomas Gleixner
2023-08-07 13:52 ` [patch 16/53] x86/xen/smp_pv: " Thomas Gleixner
2023-08-07 13:53 ` [patch 17/53] x86/mpparse: Switch to new init callbacks Thomas Gleixner
2023-08-07 13:53 ` [patch 18/53] x86/mm/numa: Move early mptable evaluation into common code Thomas Gleixner
2023-08-07 13:53 ` [patch 19/53] x86/mpparse: Remove the physid_t bitmap wrapper Thomas Gleixner
2023-08-08 11:37 ` Andy Shevchenko
2023-08-07 13:53 ` [patch 20/53] x86/apic: Remove the pointless writeback of boot_cpu_physical_apicid Thomas Gleixner
2023-08-07 13:53 ` [patch 21/53] x86/apic: Remove yet another dubious callback Thomas Gleixner
2023-08-07 13:53 ` [patch 22/53] x86/apic: Use a proper define for invalid ACPI CPU ID Thomas Gleixner
2023-08-07 13:53 ` [patch 23/53] x86/cpu/topology: Move registration out of APIC code Thomas Gleixner
2023-08-07 13:53 ` [patch 24/53] x86/cpu/topology: Provide separate APIC registration functions Thomas Gleixner
2023-08-11 12:32 ` Zhang, Rui
2023-08-07 13:53 ` [patch 25/53] x86/acpi: Use new " Thomas Gleixner
2023-08-07 15:27 ` Peter Zijlstra
2023-08-07 15:35 ` Andrew Cooper
2023-08-07 15:41 ` Thomas Gleixner
2023-08-07 13:53 ` [patch 26/53] x86/jailhouse: Use new APIC registration function Thomas Gleixner
2023-08-07 13:53 ` [patch 27/53] x86/of: Use new APIC registration functions Thomas Gleixner
2023-08-07 13:53 ` [patch 28/53] x86/mpparse: Use new APIC registration function Thomas Gleixner
2023-08-07 13:53 ` [patch 29/53] x86/acpi: Dont invoke topology_register_apic() for XEN PV Thomas Gleixner
2023-08-07 13:53 ` [patch 30/53] x86/xen/smp_pv: Register fake APICs Thomas Gleixner
2023-08-07 13:53 ` [patch 31/53] x86/cpu/topology: Confine topology information Thomas Gleixner
2023-08-07 13:53 ` [patch 32/53] x86/cpu/topology: Simplify APIC registration Thomas Gleixner
2023-08-07 13:53 ` [patch 33/53] x86/cpu/topology: Use a data structure for topology info Thomas Gleixner
2023-08-07 13:53 ` [patch 34/53] x86/smpboot: Make error message actually useful Thomas Gleixner
2023-08-07 13:53 ` [patch 35/53] x86/cpu/topology: Sanitize the APIC admission logic Thomas Gleixner
2023-08-07 13:53 ` [patch 36/53] x86/cpu/topology: Rework possible CPU management Thomas Gleixner
2023-08-14 8:29 ` Zhang, Rui
2023-08-07 13:53 ` [patch 37/53] x86/cpu: Detect real BSP on crash kernels Thomas Gleixner
2024-01-08 14:11 ` Zhang, Rui
2024-01-08 14:54 ` Thomas Gleixner
2024-01-08 16:13 ` Thomas Gleixner
2024-01-09 1:54 ` Zhang, Rui
2024-01-10 14:19 ` Thomas Gleixner
2024-01-10 15:14 ` Thomas Gleixner
2024-01-11 1:52 ` Zhang, Rui
2024-01-12 9:14 ` Zhang, Rui
2024-01-12 15:39 ` Thomas Gleixner
2024-01-13 7:35 ` Zhang, Rui
2024-01-15 9:41 ` Thomas Gleixner [this message]
2023-08-07 13:53 ` [patch 38/53] x86/topology: Add a mechanism to track topology via APIC IDs Thomas Gleixner
2023-08-07 13:53 ` [patch 39/53] x86/cpu/topology: Reject unknown APIC IDs on ACPI hotplug Thomas Gleixner
2023-08-07 13:53 ` [patch 40/53] x86/cpu/topology: Assign hotpluggable CPUIDs during init Thomas Gleixner
2023-08-07 13:53 ` [patch 41/53] x86/xen/smp_pv: Count number of vCPUs early Thomas Gleixner
2023-08-07 13:53 ` [patch 42/53] x86/cpu/topology: Let XEN/PV use topology from CPUID/MADT Thomas Gleixner
2023-08-07 13:53 ` [patch 43/53] x86/cpu/topology: Use topology bitmaps for sizing Thomas Gleixner
2023-08-07 13:53 ` [patch 44/53] x86/cpu/topology: Mop up primary thread mask handling Thomas Gleixner
2023-08-07 13:53 ` [patch 45/53] x86/cpu/topology: Simplify cpu_mark_primary_thread() Thomas Gleixner
2023-08-07 13:53 ` [patch 46/53] x86/cpu/topology: Provide logical pkg/die mapping Thomas Gleixner
2023-08-07 13:53 ` [patch 47/53] x86/cpu/topology: Use topology logical mapping mechanism Thomas Gleixner
2023-08-07 13:53 ` [patch 48/53] x86/cpu/topology: Retrieve cores per package from topology bitmaps Thomas Gleixner
2023-08-07 13:53 ` [patch 49/53] x86: Use topology functions instead of smp_num_siblings where applicable Thomas Gleixner
2023-08-07 13:53 ` [patch 50/53] x86/cpu/topology: Rename smp_num_siblings Thomas Gleixner
2023-08-07 13:53 ` [patch 51/53] x86/cpu/topology: Rename topology_max_die_per_package() Thomas Gleixner
2023-08-07 13:53 ` [patch 52/53] x86/cpu/topology: Provide __num_[cores|threads]_per_package Thomas Gleixner
2023-08-07 13:53 ` [patch 53/53] x86/cpu/topology: Get rid of cpuinfo::x86_max_cores Thomas Gleixner
2023-08-11 15:44 ` Zhang, Rui
2023-12-14 14:00 ` Zhang, Rui
2023-08-08 7:40 ` [patch 00/53] x86/topology: The final installment Juergen Gross
2023-08-08 11:20 ` Andrew Cooper
2023-08-08 18:55 ` Thomas Gleixner
2023-08-08 18:29 ` Sohil Mehta
2023-08-08 19:10 ` Thomas Gleixner
2023-08-08 20:30 ` Sohil Mehta
2023-08-08 20:41 ` Thomas Gleixner
2023-08-08 22:10 ` Peter Zijlstra
2023-08-08 22:58 ` Sohil Mehta
2023-08-08 23:20 ` Thomas Gleixner
2023-08-09 16:55 ` Sohil Mehta
2023-08-10 3:28 ` Zhang, Rui
2023-08-09 16:50 ` Qiuxu Zhuo
2023-08-09 17:23 ` Sohil Mehta
2023-08-10 1:33 ` Zhuo, Qiuxu
2023-08-08 20:57 ` Thomas Gleixner
2023-08-09 16:12 ` Qiuxu Zhuo
2023-08-12 13:51 ` Michael Kelley (LINUX)
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