Re: [PATCH v11 04/20] x86/cpu: Detect TDX partial write machine check erratum

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To: "Huang, Kai" <kai.huang@xxxxxxxxx>
Subject: Re: [PATCH v11 04/20] x86/cpu: Detect TDX partial write machine check erratum
From: "kirill.shutemov@xxxxxxxxxxxxxxx" <kirill.shutemov@xxxxxxxxxxxxxxx>
Date: Wed, 7 Jun 2023 18:06:34 +0300
Cc: "kvm@xxxxxxxxxxxxxxx" <kvm@xxxxxxxxxxxxxxx>, "Hansen, Dave" <dave.hansen@xxxxxxxxx>, "david@xxxxxxxxxx" <david@xxxxxxxxxx>, "bagasdotme@xxxxxxxxx" <bagasdotme@xxxxxxxxx>, "ak@xxxxxxxxxxxxxxx" <ak@xxxxxxxxxxxxxxx>, "Wysocki, Rafael J" <rafael.j.wysocki@xxxxxxxxx>, "linux-kernel@xxxxxxxxxxxxxxx" <linux-kernel@xxxxxxxxxxxxxxx>, "Chatre, Reinette" <reinette.chatre@xxxxxxxxx>, "Christopherson,, Sean" <seanjc@xxxxxxxxxx>, "pbonzini@xxxxxxxxxx" <pbonzini@xxxxxxxxxx>, "tglx@xxxxxxxxxxxxx" <tglx@xxxxxxxxxxxxx>, "linux-mm@xxxxxxxxx" <linux-mm@xxxxxxxxx>, "Yamahata, Isaku" <isaku.yamahata@xxxxxxxxx>, "Luck, Tony" <tony.luck@xxxxxxxxx>, "peterz@xxxxxxxxxxxxx" <peterz@xxxxxxxxxxxxx>, "Shahar, Sagi" <sagis@xxxxxxxxxx>, "imammedo@xxxxxxxxxx" <imammedo@xxxxxxxxxx>, "Gao, Chao" <chao.gao@xxxxxxxxx>, "Brown, Len" <len.brown@xxxxxxxxx>, "sathyanarayanan.kuppuswamy@xxxxxxxxxxxxxxx" <sathyanarayanan.kuppuswamy@xxxxxxxxxxxxxxx>, "Huang, Ying" <ying.huang@xxxxxxxxx>, "Williams, Dan J" <dan.j.williams@xxxxxxxxx>
In-reply-to: <4e9acea6b956e1fb83b4e49fc8d154295e321f29.camel@intel.com>
References: <cover.1685887183.git.kai.huang@intel.com> <86f2a8814240f4bbe850f6a09fc9d0b934979d1b.1685887183.git.kai.huang@intel.com> <20230606123821.exit7gyxs42dxotz@box.shutemov.name> <4e9acea6b956e1fb83b4e49fc8d154295e321f29.camel@intel.com>

On Tue, Jun 06, 2023 at 10:58:04PM +0000, Huang, Kai wrote:
> So it seems there's no hard rule that all bugs need to be done in
> cpu_set_bug_bits().

Yes, CPU identify is a mess, but initcall makes it worse. Initcall is lazy
way out that contributes to the mess. Maybe cpu_set_bug_bits() is the
wrong place, find the right one.

-- 
  Kiryl Shutsemau / Kirill A. Shutemov

References:
- [PATCH v11 00/20] TDX host kernel support
  - From: Kai Huang
- [PATCH v11 04/20] x86/cpu: Detect TDX partial write machine check erratum
  - From: Kai Huang
- Re: [PATCH v11 04/20] x86/cpu: Detect TDX partial write machine check erratum
  - From: kirill . shutemov
- Re: [PATCH v11 04/20] x86/cpu: Detect TDX partial write machine check erratum
  - From: Huang, Kai

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