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

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Message-ID: <6a0b7c20-a250-4542-b170-101c9663b2e5@suse.com>
Date: Fri, 19 Apr 2024 13:52:55 +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>
Subject: Re: [PATCH 1/2] x86/cpu: fix BSP detection when running as Xen PV
 guest

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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