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Re: [Xen-devel] [PATCH v2 0/3] x86: Protected Processor Inventory Number (PPIN) support
- To: Jan Beulich <jbeulich@xxxxxxxx>
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Mon, 16 Dec 2019 12:20:18 +0000
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- Cc: "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>, Wei Liu <wl@xxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>
- Delivery-date: Mon, 16 Dec 2019 12:20:32 +0000
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- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
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On 16/12/2019 11:33, Jan Beulich wrote:
> On 13.12.2019 20:50, Andrew Cooper wrote:
>> On 08/11/2019 15:22, Jan Beulich wrote:
>>> 1: include the PPIN in MCE records when available
>>> 2: explicitly disallow guest access to PPIN
>>> 3: provide Dom0 access to PPIN via XENPF_resource_op
>>>
>>> I have yet to get around to post the Linux side consumer
>>> patch of the interface addition in patch 1.
>> What about printing the PPIN information when Xen writes MCE details to
>> the console?
> Do you mean in x86_mcinfo_dump(), or mc_panic(), or yet somewhere
> else?
Something which ends up on the console.
> In any event if we did so I'd want to arrange for each PPIN
> to get logged at most once, to reduce unnecessary redundancy.
Getting it printed, even redundantly is more helpful than not having it
printed.
> Of course there's a comment ahead of x86_mcinfo_dump() mentioning
> that the output is to be parseable by mcelog, so I'm not sure if
> we can reasonably change what we produce. Otoh I'm also not sure
> the comment hasn't become stale with its (presumed) porting from
> Linux anyway.
That comment is long obsolete. What Xen prints needs substantial
rearranging for mcelog to parse it these days.
~Andrew
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