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

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Message-ID: <d755ebf7-c5ce-02a0-3f49-3910a5263e18@redhat.com>
Date:   Thu, 4 Jan 2018 16:32:47 +0100
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     "Woodhouse, David" <dwmw@...zon.co.uk>,
        "pavel@....cz" <pavel@....cz>,
        "andrew.cooper3@...rix.com" <andrew.cooper3@...rix.com>
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 04/01/2018 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.

Paolo