linux-kernel - RE: [PATCH v15 22/23] x86/mce: Improve error log of kernel space TDX #MC due to erratum

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Message-ID: <DS7PR11MB60774E0BC0F8EFA103310D27FC85A@DS7PR11MB6077.namprd11.prod.outlook.com>
Date:   Tue, 5 Dec 2023 16:36:26 +0000
From:   "Luck, Tony" <tony.luck@...el.com>
To:     Sean Christopherson <seanjc@...gle.com>,
        "Hansen, Dave" <dave.hansen@...el.com>
CC:     "Huang, Kai" <kai.huang@...el.com>,
        "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "rafael@...nel.org" <rafael@...nel.org>,
        "Gao, Chao" <chao.gao@...el.com>,
        "david@...hat.com" <david@...hat.com>,
        "bagasdotme@...il.com" <bagasdotme@...il.com>,
        "ak@...ux.intel.com" <ak@...ux.intel.com>,
        "kirill.shutemov@...ux.intel.com" <kirill.shutemov@...ux.intel.com>,
        "mingo@...hat.com" <mingo@...hat.com>,
        "pbonzini@...hat.com" <pbonzini@...hat.com>,
        "tglx@...utronix.de" <tglx@...utronix.de>,
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        <sathyanarayanan.kuppuswamy@...ux.intel.com>,
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        "Williams, Dan J" <dan.j.williams@...el.com>,
        "x86@...nel.org" <x86@...nel.org>
Subject: RE: [PATCH v15 22/23] x86/mce: Improve error log of kernel space TDX
 #MC due to erratum

>> Fine.  This doesn't need to change ... until you load TDX.  Once you
>> initialize the TDX module, no more out-of-tree VMMs for you.
>
> It's not just out-of-tree hypervisors, which IMO should be little more than an
> afterthought.  The other more important issue is that being post-VMXON blocks INIT,

Does that make CPU offline a one-way process? Linux uses INIT to bring a CPU back
online again.

-Tony