Re: [PATCH v3 0/4] x86/cpu/topology: Work around the nuances of virtualization on AMD/Hygon

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To: K Prateek Nayak <kprateek.nayak@xxxxxxx>
Subject: Re: [PATCH v3 0/4] x86/cpu/topology: Work around the nuances of virtualization on AMD/Hygon
From: Borislav Petkov <bp@xxxxxxxxx>
Date: Wed, 20 Aug 2025 11:28:03 +0200
Cc: Naveen N Rao <naveen@xxxxxxxxxx>, Thomas Gleixner <tglx@xxxxxxxxxxxxx>, Ingo Molnar <mingo@xxxxxxxxxx>, Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>, Sean Christopherson <seanjc@xxxxxxxxxx>, Paolo Bonzini <pbonzini@xxxxxxxxxx>, x86@xxxxxxxxxx, Sairaj Kodilkar <sarunkod@xxxxxxx>, "H. Peter Anvin" <hpa@xxxxxxxxx>, "Peter Zijlstra (Intel)" <peterz@xxxxxxxxxxxxx>, "Xin Li (Intel)" <xin@xxxxxxxxx>, Pawan Gupta <pawan.kumar.gupta@xxxxxxxxxxxxxxx>, linux-kernel@xxxxxxxxxxxxxxx, kvm@xxxxxxxxxxxxxxx, Mario Limonciello <mario.limonciello@xxxxxxx>, "Gautham R. Shenoy" <gautham.shenoy@xxxxxxx>, Babu Moger <babu.moger@xxxxxxx>, Suravee Suthikulpanit <suravee.suthikulpanit@xxxxxxx>
In-reply-to: <97aace4c-921f-4037-b8f2-c4112b4a26a9@amd.com>
References: <20250818060435.2452-1-kprateek.nayak@amd.com> <20250819113447.GJaKRhVx6lBPUc6NMz@fat_crate.local> <mcclyouhgeqzkhljovu7euzvowyqrtf5q4madh3f32yeb7ubnk@xdtbsvi2m7en> <20250820085935.GBaKWOd5Wk3plH0h1l@fat_crate.local> <97aace4c-921f-4037-b8f2-c4112b4a26a9@amd.com>

On Wed, Aug 20, 2025 at 02:42:26PM +0530, K Prateek Nayak wrote:
>       tscan->c->topo.initial_apicid = leaf.ext_apic_id; /*** Overwritten here ***/

Looks like it shouldn't unconditionally overwrite it but I'll let tglx comment
here.

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette

References:
- [PATCH v3 0/4] x86/cpu/topology: Work around the nuances of virtualization on AMD/Hygon
  - From: K Prateek Nayak
- Re: [PATCH v3 0/4] x86/cpu/topology: Work around the nuances of virtualization on AMD/Hygon
  - From: Borislav Petkov
- Re: [PATCH v3 0/4] x86/cpu/topology: Work around the nuances of virtualization on AMD/Hygon
  - From: Naveen N Rao
- Re: [PATCH v3 0/4] x86/cpu/topology: Work around the nuances of virtualization on AMD/Hygon
  - From: Borislav Petkov
- Re: [PATCH v3 0/4] x86/cpu/topology: Work around the nuances of virtualization on AMD/Hygon
  - From: K Prateek Nayak

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