linux-kernel - Re: [PATCH v3 3/5] x86/enter: Use IBRS on syscall and interrupts

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Message-ID: <1515674729.22302.330.camel@amazon.co.uk>
Date:   Thu, 11 Jan 2018 12:45:29 +0000
From:   "Woodhouse, David" <dwmw@...zon.co.uk>
To:     Tim Chen <tim.c.chen@...ux.intel.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Andy Lutomirski <luto@...nel.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Greg KH <gregkh@...uxfoundation.org>
CC:     Dave Hansen <dave.hansen@...el.com>,
        Andrea Arcangeli <aarcange@...hat.com>,
        Andi Kleen <ak@...ux.intel.com>,
        Arjan Van De Ven <arjan.van.de.ven@...el.com>,
        Peter Zijlstra <peterz@...radead.org>,
        "Dan Williams" <dan.j.williams@...el.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Ashok Raj <ashok.raj@...el.com>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 3/5] x86/enter: Use IBRS on syscall and interrupts

On Tue, 2018-01-09 at 18:26 -0800, Tim Chen wrote:
> Set IBRS upon kernel entrance via syscall and interrupts. Clear it
> upon exit. 

In the former set of sites, you're going to want to stuff the RSB too.
The patch I sent out this morning adds the infrastructure you want for
that; we'll just want to shift it from being dependent on RETPOLINE
(both CONFIG_RETPOLINE and X86_FEATURE_RETPOLINE).

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