linux-kernel - Re: [PATCH v11 19/20] x86/mce: Improve error log of kernel space TDX #MC due to erratum

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Message-ID: <a87b5d2f3e9a4219f739da9bb8677c2eaa8b33c2.camel@intel.com>
Date:   Mon, 5 Jun 2023 23:05:34 +0000
From:   "Huang, Kai" <kai.huang@...el.com>
To:     "Li, Xiaoyao" <xiaoyao.li@...el.com>,
        "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:     "Hansen, Dave" <dave.hansen@...el.com>,
        "david@...hat.com" <david@...hat.com>,
        "bagasdotme@...il.com" <bagasdotme@...il.com>,
        "ak@...ux.intel.com" <ak@...ux.intel.com>,
        "Wysocki, Rafael J" <rafael.j.wysocki@...el.com>,
        "kirill.shutemov@...ux.intel.com" <kirill.shutemov@...ux.intel.com>,
        "Chatre, Reinette" <reinette.chatre@...el.com>,
        "Christopherson,, Sean" <seanjc@...gle.com>,
        "pbonzini@...hat.com" <pbonzini@...hat.com>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "Yamahata, Isaku" <isaku.yamahata@...el.com>,
        "tglx@...utronix.de" <tglx@...utronix.de>,
        "Luck, Tony" <tony.luck@...el.com>,
        "peterz@...radead.org" <peterz@...radead.org>,
        "Shahar, Sagi" <sagis@...gle.com>,
        "imammedo@...hat.com" <imammedo@...hat.com>,
        "Gao, Chao" <chao.gao@...el.com>,
        "Brown, Len" <len.brown@...el.com>,
        "sathyanarayanan.kuppuswamy@...ux.intel.com" 
        <sathyanarayanan.kuppuswamy@...ux.intel.com>,
        "Huang, Ying" <ying.huang@...el.com>,
        "Williams, Dan J" <dan.j.williams@...el.com>
Subject: Re: [PATCH v11 19/20] x86/mce: Improve error log of kernel space TDX
 #MC due to erratum

On Mon, 2023-06-05 at 10:13 +0800, Li, Xiaoyao wrote:
> On 6/4/2023 10:27 PM, Kai Huang wrote:
> > == Problem ==
> > 
> > A partial write to a TDX private memory cacheline will silently "poison"
> > the line.  Subsequent reads will consume the poison and generate a
> > machine check.  According to the TDX hardware spec, neither of these
> > things should have happened.
> 
> The expectation is that write to TDX private memory with HKID 0 doesn't 
> poison the cache line. However, a partial write with HKID 0 does poison 
> the cache line. This is the erratum, right?
> 

Yes.