linux-kernel - RE: [PATCH v2 4/4] x86: vmx: Allow direct access to MSR_IA32_ARCH

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Message-ID: <0575AF4FD06DD142AD198903C74E1CC87A60281D@ORSMSX103.amr.corp.intel.com>
Date:   Mon, 29 Jan 2018 14:18:00 +0000
From:   "Van De Ven, Arjan" <arjan.van.de.ven@...el.com>
To:     Paolo Bonzini <pbonzini@...hat.com>,
        KarimAllah Ahmed <karahmed@...zon.de>,
        "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "x86@...nel.org" <x86@...nel.org>
CC:     "Mallick, Asit K" <asit.k.mallick@...el.com>,
        "Hansen, Dave" <dave.hansen@...el.com>,
        Tim Chen <tim.c.chen@...ux.intel.com>,
        "Linus Torvalds" <torvalds@...ux-foundation.org>,
        Andrea Arcangeli <aarcange@...hat.com>,
        Andi Kleen <ak@...ux.intel.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        "Williams, Dan J" <dan.j.williams@...el.com>,
        "Nakajima, Jun" <jun.nakajima@...el.com>,
        Andy Lutomirski <luto@...nel.org>,
        Greg KH <gregkh@...uxfoundation.org>,
        "Raj, Ashok" <ashok.raj@...el.com>
Subject: RE: [PATCH v2 4/4] x86: vmx: Allow direct access to
 MSR_IA32_ARCH_CAPABILITIES

> On 29/01/2018 01:58, KarimAllah Ahmed wrote:
> > Add direct access to MSR_IA32_SPEC_CTRL for guests. Future intel processors
> > will use this MSR to indicate RDCL_NO (bit 0) and IBRS_ALL (bit 1).
> 
> This has to be customizable per-VM (similar to the patches Amazon posted
> a while ago for UCODE_REV for example).  It's not urgent anyway given
> that no processor has it yet.


Apollo lake has it once you update the microcode.