linux-kernel - Re: Avoid speculative indirect calls in kernel

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Date:   Thu, 4 Jan 2018 15:37:40 +0000
From:   Andrew Cooper <andrew.cooper3@...rix.com>
To:     Paolo Bonzini <pbonzini@...hat.com>,
        "Woodhouse, David" <dwmw@...zon.co.uk>,
        "pavel@....cz" <pavel@....cz>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "tim.c.chen@...ux.intel.com" <tim.c.chen@...ux.intel.com>,
        "torvalds@...ux-foundation.org" <torvalds@...ux-foundation.org>,
        "tglx@...utronix.de" <tglx@...utronix.de>,
        "andi@...stfloor.org" <andi@...stfloor.org>,
        "aarcange@...hat.com" <aarcange@...hat.com>,
        "gnomes@...rguk.ukuu.org.uk" <gnomes@...rguk.ukuu.org.uk>,
        "dave.hansen@...el.com" <dave.hansen@...el.com>,
        "gregkh@...ux-foundation.org" <gregkh@...ux-foundation.org>
Subject: Re: Avoid speculative indirect calls in kernel

On 04/01/18 15:32, Paolo Bonzini wrote:
> On 04/01/2018 16:29, Woodhouse, David wrote:
>> Adding that for KVM is in the Linux IBRS patch set that I've seen.
>> Didn't we already have a conversation about how the Linux patch set
>> does it as an atomically-switched MSR while you've done it manually in
>> Xen because it's faster?
> I'm also doing it manually in the RHEL versions of the KVM patches, for
> what it's worth.

Actually, I did it manually in Xen because I was expecting IBRS on AMD,
and there are no MSR load/save lists for PV or SVM guests.  (Also yes,
I've been reliably informed that manually is much faster than VT-x
load/save lists.)

~Andrew