RE: [PATCH v2 4/4] x86: vmx: Allow direct access to MSR_IA32_ARCH_CAPABILITIES

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Subject: RE: [PATCH v2 4/4] x86: vmx: Allow direct access to MSR_IA32_ARCH_CAPABILITIES
From: "Van De Ven, Arjan" <arjan.van.de.ven@xxxxxxxxx>
Date: Mon, 29 Jan 2018 14:18:00 +0000
Accept-language: en-US
Cc: "Mallick, Asit K" <asit.k.mallick@xxxxxxxxx>, "Hansen, Dave" <dave.hansen@xxxxxxxxx>, Tim Chen <tim.c.chen@xxxxxxxxxxxxxxx>, "Linus Torvalds" <torvalds@xxxxxxxxxxxxxxxxxxxx>, Andrea Arcangeli <aarcange@xxxxxxxxxx>, Andi Kleen <ak@xxxxxxxxxxxxxxx>, Thomas Gleixner <tglx@xxxxxxxxxxxxx>, "Williams, Dan J" <dan.j.williams@xxxxxxxxx>, "Nakajima, Jun" <jun.nakajima@xxxxxxxxx>, Andy Lutomirski <luto@xxxxxxxxxx>, Greg KH <gregkh@xxxxxxxxxxxxxxxxxxx>, "Raj, Ashok" <ashok.raj@xxxxxxxxx>
Dlp-product: dlpe-windows
Dlp-reaction: no-action
Dlp-version: 11.0.0.116
In-reply-to: <32627024-026c-4415-8153-bfb9778877b8@redhat.com>
References: <1517187532-32286-1-git-send-email-karahmed@amazon.de> <1517187532-32286-5-git-send-email-karahmed@amazon.de> <32627024-026c-4415-8153-bfb9778877b8@redhat.com>

> 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.

References:
- [PATCH v2 0/4] KVM: Expose speculation control feature to guests
  - From: KarimAllah Ahmed
- [PATCH v2 4/4] x86: vmx: Allow direct access to MSR_IA32_ARCH_CAPABILITIES
  - From: KarimAllah Ahmed
- Re: [PATCH v2 4/4] x86: vmx: Allow direct access to MSR_IA32_ARCH_CAPABILITIES
  - From: Paolo Bonzini

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