linux-kernel - Re: [PATCH 3/7] x86/enter: Use IBRS on syscall and interrupts

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Message-ID: <alpine.DEB.2.20.1801051426410.1724@nanos>
Date:   Fri, 5 Jan 2018 14:35:36 +0100 (CET)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Tim Chen <tim.c.chen@...ux.intel.com>
cc:     Andy Lutomirski <luto@...nel.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Greg KH <gregkh@...uxfoundation.org>,
        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>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/7] x86/enter: Use IBRS on syscall and interrupts

On Thu, 4 Jan 2018, Tim Chen wrote:

> Set IBRS upon kernel entrance via syscall and interrupts. Clear it
> upon exit.

I have no idea on which kernel this is supposed to apply. It fails on Linus
tree and on tip x86/pti.

Can you please finally ditch the broken and outdated version of PTI on
which this is based on? I really wonder how this stuff is developed and
tested when its missing essential fixes.

Please post patches against tip x86/pti where the lastest fixes and patches
concerning this mess are staged for both Linus and 4.14.stable

Thanks,

	tglx