linux-kernel - Re: [PATCH] x86/retpoline: Fill return stack buffer on vmexit

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Message-ID: <20180111084915.GU6176@hirez.programming.kicks-ass.net>
Date:   Thu, 11 Jan 2018 09:49:15 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     David Woodhouse <dwmw@...zon.co.uk>
Cc:     Andi Kleen <ak@...ux.intel.com>, Paul Turner <pjt@...gle.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Greg Kroah-Hartman <gregkh@...ux-foundation.org>,
        Tim Chen <tim.c.chen@...ux.intel.com>,
        Dave Hansen <dave.hansen@...el.com>, tglx@...utronix.de,
        Kees Cook <keescook@...gle.com>,
        Rik van Riel <riel@...hat.com>,
        Andy Lutomirski <luto@...capital.net>,
        Jiri Kosina <jikos@...nel.org>, gnomes@...rguk.ukuu.org.uk,
        x86@...nel.org, bp@...en8.de, rga@...zon.de
Subject: Re: [PATCH] x86/retpoline: Fill return stack buffer on vmexit

On Wed, Jan 10, 2018 at 10:51:22PM +0000, David Woodhouse wrote:
> This implements the most pressing of the RSB stuffing documented
> by dhansen (based our discussions) in https://goo.gl/pXbvBE

Only took me 3 readings to find interrupts/traps were in fact
enumerated. Could we plretty please separate them from the deep call
case? Also might make sense to explicitly mention SMI, as that will be
the most difficult to fix :-(