linux-kernel - Re: [RFC PATCH] x86/mce: Make mce

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Date:   Thu, 10 Sep 2020 11:42:06 -0700
From:   "Luck, Tony" <tony.luck@...el.com>
To:     Borislav Petkov <bp@...en8.de>
Cc:     x86-ml <x86@...nel.org>, lkml <linux-kernel@...r.kernel.org>
Subject: Re: [RFC PATCH] x86/mce: Make mce_rdmsrl() do a plain RDMSR only

On Thu, Sep 10, 2020 at 08:29:19PM +0200, Borislav Petkov wrote:
> Ok, with all those changes, I don't think the following nice and juicy
> message can be overlooked:
> 
> [   32.267830] mce: MSR access error: RDMSR from 0x1234 at rIP: 0xffffffff8102ed62 (mce_rdmsrl+0x12/0x50)

With only one call site the rIP isn't super helpful at the moment. But
once you start selling those "MSR or die" T-shirts everyone will want
to use this :-)

> [   32.267838] Call Trace:
> [   32.267838]  <#MC>
> [   32.267838]  do_machine_check+0xbd/0x9f0
> [   32.267839]  ? trigger_mce+0x7/0x10
> [   32.267839]  exc_machine_check+0x77/0xd0
> [   32.267840]  asm_exc_machine_check+0x19/0x30

Do we need the stack trace twice? Once from your fixup
function, second from panic()?

-Tony