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

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Message-ID: <20140723231032.GZ18735@two.firstfloor.org>
Date:	Thu, 24 Jul 2014 01:10:32 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Andy Lutomirski <luto@...capital.net>
Cc:	Andi Kleen <andi@...stfloor.org>,
	"H. Peter Anvin" <hpa@...ux.intel.com>,
	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)

> 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.

-Andi
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