linux-kernel - RE: [PATCH 1/3] x86/MCE, EDAC/mce_amd: Add support for new MCA

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Message-ID: <SJ1PR11MB608390D539CD4B405A195344FC2E9@SJ1PR11MB6083.namprd11.prod.outlook.com>
Date:   Mon, 24 Oct 2022 21:08:54 +0000
From:   "Luck, Tony" <tony.luck@...el.com>
To:     Borislav Petkov <bp@...en8.de>
CC:     Yazen Ghannam <yazen.ghannam@....com>,
        "linux-edac@...r.kernel.org" <linux-edac@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "x86@...nel.org" <x86@...nel.org>,
        "Smita.KoralahalliChannabasappa@....com" 
        <Smita.KoralahalliChannabasappa@....com>
Subject: RE: [PATCH 1/3] x86/MCE, EDAC/mce_amd: Add support for new
 MCA_SYND{1,2} registers

We already have:

        __u8  cpuvendor;        /* Kernel's X86_VENDOR enum */

So the mce structure contains which vendor created it.

> I guess a u8 vendor_info[VENDOR_INFO_SIZE] or so which we can extend
> later if needed.

Extending is hard because we already boxed in the two AMD specific fields
with some generic fields that follow (ppin & microcode).

But we could change the current form to be something like:

	union {
		struct vendor_info {
			__u64	vendor_info[2];
		};
		struct vendor_amd_info {
			__u64 synd;             /* MCA_SYND MSR: only valid on SMCA systems */
			__u64 ipid;             /* MCA_IPID MSR: only valid on SMCA systems */
		};
	};

to make it clear that these 16 bytes are up for grabs to be re-interpreted based on
the value of "cpuvendor" (and possibly also "cpuid" if a vendor wants different data
logged for different models).

-Tony