linux-kernel - Re: [PATCH 1/2] x86/cpu: fix BSP detection when running as Xen PV guest

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Date: Tue, 30 Apr 2024 13:55:49 +0200
From: Juergen Gross <jgross@...e.com>
To: linux-kernel@...r.kernel.org, x86@...nel.org
Cc: Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>,
 Borislav Petkov <bp@...en8.de>, Dave Hansen <dave.hansen@...ux.intel.com>,
 "H. Peter Anvin" <hpa@...or.com>,
 Linux regressions mailing list <regressions@...ts.linux.dev>
Subject: Re: [PATCH 1/2] x86/cpu: fix BSP detection when running as Xen PV
 guest

PING!!!!

This patch fixes a regression introduced in 6.9-rc1.

Please consider taking the patch in the 6.9 cycle!

#regzbot ^introduced: 5c5682b9f87a


Juergen

On 19.04.24 13:52, Juergen Gross wrote:
> Ping?
> 
> On 05.04.24 14:34, Juergen Gross wrote:
>> When booting as a Xen PV guest the boot processor isn't detected
>> correctly and the following message is shown:
>>
>>    CPU topo: Boot CPU APIC ID not the first enumerated APIC ID: 0 > 1
>>
>> Additionally this results in one CPU being ignored.
>>
>> Fix that by calling the BSP detection logic when registering the boot
>> CPU's APIC, too.
>>
>> Fixes: 5c5682b9f87a ("x86/cpu: Detect real BSP on crash kernels")
>> Signed-off-by: Juergen Gross <jgross@...e.com>
>> ---
>>   arch/x86/kernel/cpu/topology.c | 2 +-
>>   1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/arch/x86/kernel/cpu/topology.c b/arch/x86/kernel/cpu/topology.c
>> index aaca8d235dc2..23c3db5e6396 100644
>> --- a/arch/x86/kernel/cpu/topology.c
>> +++ b/arch/x86/kernel/cpu/topology.c
>> @@ -255,7 +255,7 @@ void __init topology_register_boot_apic(u32 apic_id)
>>       WARN_ON_ONCE(topo_info.boot_cpu_apic_id != BAD_APICID);
>>       topo_info.boot_cpu_apic_id = apic_id;
>> -    topo_register_apic(apic_id, CPU_ACPIID_INVALID, true);
>> +    topology_register_apic(apic_id, CPU_ACPIID_INVALID, true);
>>   }
>>   /**
> 


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