linux-kernel - Re: [RFC 10/10] x86/enter: Use IBRS on syscall and interrupts

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Message-ID: <243f14f6-940a-65fc-08b8-3fd54dac8c15@amazon.com>
Date:   Sun, 21 Jan 2018 15:40:12 +0100
From:   KarimAllah Ahmed <karahmed@...zon.com>
To:     Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
        KarimAllah Ahmed <karahmed@...zon.de>
CC:     <linux-kernel@...r.kernel.org>, Andi Kleen <ak@...ux.intel.com>,
        "Andrea Arcangeli" <aarcange@...hat.com>,
        Andy Lutomirski <luto@...nel.org>,
        "Arjan van de Ven" <arjan@...ux.intel.com>,
        Ashok Raj <ashok.raj@...el.com>,
        Asit Mallick <asit.k.mallick@...el.com>,
        Borislav Petkov <bp@...e.de>,
        Dan Williams <dan.j.williams@...el.com>,
        Dave Hansen <dave.hansen@...el.com>,
        "David Woodhouse" <dwmw@...zon.co.uk>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "H . Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...hat.com>,
        Janakarajan Natarajan <Janakarajan.Natarajan@....com>,
        Joerg Roedel <joro@...tes.org>,
        Jun Nakajima <jun.nakajima@...el.com>,
        "Laura Abbott" <labbott@...hat.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Radim Krčmář <rkrcmar@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Tim Chen <tim.c.chen@...ux.intel.com>,
        Tom Lendacky <thomas.lendacky@....com>, <kvm@...r.kernel.org>,
        <x86@...nel.org>, Arjan Van De Ven <arjan.van.de.ven@...el.com>
Subject: Re: [RFC 10/10] x86/enter: Use IBRS on syscall and interrupts

On 01/21/2018 02:50 PM, Konrad Rzeszutek Wilk wrote:

> On Sat, Jan 20, 2018 at 08:23:01PM +0100, KarimAllah Ahmed wrote:
>> From: Tim Chen <tim.c.chen@...ux.intel.com>
>>
>> Stop Indirect Branch Speculation on every user space to kernel space
>> transition and reenable it when returning to user space./
> How about interrupts?
>
> That is should .macro interrupt have the same treatment?

RESTRICT_IB_SPEC is called in switch_to_thread_stack which is almost the 
first thing called from ".macro interrupt".

>

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