linux-kernel - Re: [RFC KVM 02/27] KVM: x86: Introduce address_space

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Message-ID: <CALCETrUjLRgKH3XbZ+=pLCzPiFOV7DAvAYUvNLA7SMNkaNLEqQ@mail.gmail.com>
Date:   Mon, 13 May 2019 08:46:22 -0700
From:   Andy Lutomirski <luto@...nel.org>
To:     Alexandre Chartre <alexandre.chartre@...cle.com>
Cc:     Paolo Bonzini <pbonzini@...hat.com>,
        Radim Krcmar <rkrcmar@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "H. Peter Anvin" <hpa@...or.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Andrew Lutomirski <luto@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        kvm list <kvm@...r.kernel.org>, X86 ML <x86@...nel.org>,
        Linux-MM <linux-mm@...ck.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
        jan.setjeeilers@...cle.com, Liran Alon <liran.alon@...cle.com>,
        Jonathan Adams <jwadams@...gle.com>
Subject: Re: [RFC KVM 02/27] KVM: x86: Introduce address_space_isolation
 module parameter

On Mon, May 13, 2019 at 7:39 AM Alexandre Chartre
<alexandre.chartre@...cle.com> wrote:
>
> From: Liran Alon <liran.alon@...cle.com>
>
> Add the address_space_isolation parameter to the kvm module.
>
> When set to true, KVM #VMExit handlers run in isolated address space
> which maps only KVM required code and per-VM information instead of
> entire kernel address space.

Does the *entry* also get isolated?  If not, it seems less useful for
side-channel mitigation.