linux-kernel - Re: [tip:x86/urgent] x86/mce: Ensure offline CPUs don' t participate in rendezvous process

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Message-ID: <036f5f6f2d8a4a768309b61540857393@zhaoxin.com>
Date:   Thu, 30 May 2019 03:50:39 +0000
From:   Tony W Wang-oc <TonyWWang-oc@...oxin.com>
To:     "tipbot@...or.com" <tipbot@...or.com>,
        "ashok.raj@...el.com" <ashok.raj@...el.com>
CC:     "bp@...e.de" <bp@...e.de>, "hpa@...or.com" <hpa@...or.com>,
        "linux-edac@...r.kernel.org" <linux-edac@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-tip-commits@...r.kernel.org" 
        <linux-tip-commits@...r.kernel.org>,
        "mingo@...nel.org" <mingo@...nel.org>,
        "peterz@...radead.org" <peterz@...radead.org>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>,
        "tglx@...utronix.de" <tglx@...utronix.de>,
        "tony.luck@...el.com" <tony.luck@...el.com>,
        "torvalds@...ux-foundation.org" <torvalds@...ux-foundation.org>,
        David Wang <DavidWang@...oxin.com>
Subject: Re: [tip:x86/urgent] x86/mce: Ensure offline CPUs don' t participate
 in rendezvous process

Hi Ashok,
I have two questions about this patch, could you help to check:

1, for broadcast #MC exceptions, this patch seems require #MC exception errors
set MCG_STATUS_RIPV = 1. 
But for Intel CPU, some #MC exception errors set MCG_STATUS_RIPV = 0 
(like "Recoverable-not-continuable SRAR Type" Errors), for these errors
the patch doesn't seem to work, is that okay?

2, for LMCE exceptions, this patch seems require #MC exception errors
set MCG_STATUS_RIPV = 0 to make sure LMCE be handled normally even
on offline CPU. 
For LMCE errors set MCG_STAUS_RIPV = 1, the patch prevents offline CPU
handle these LMCE errors, is that okay?

Thanks
Tony W Wang-oc