linux-kernel - Re: STI architectural question (and lretq -- I'm not even kidding)

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Message-ID: <53D1857B.4050307@linux.intel.com>
Date:	Thu, 24 Jul 2014 15:15:23 -0700
From:	"H. Peter Anvin" <hpa@...ux.intel.com>
To:	Andi Kleen <andi@...stfloor.org>,
	Andy Lutomirski <luto@...capital.net>
CC:	Borislav Petkov <bp@...en8.de>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	X86 ML <x86@...nel.org>
Subject: Re: STI architectural question (and lretq -- I'm not even kidding)

On 07/23/2014 04:10 PM, Andi Kleen wrote:
>> I think that, other than broadcast MCEs, #MC that hits in kernel mode
>> is non-recoverable, or at least can't safely be recovered.  (There's a
>> separate APIC interrupt for recoverable errors, I think, but that's a
>> much saner interface.)
> 
> There are multiple valid cases where #MC can return.
> 

Indeed, not just broadcast #MC.

	-hpa


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