linux-kernel - Re: [PATCH v6 3/5] KVM: VMX: Emulate MSR_IA32_ARCH

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Date:   Fri, 2 Feb 2018 12:51:00 -0500
From:   Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
To:     KarimAllah Ahmed <karahmed@...zon.de>
Cc:     kvm@...r.kernel.org, linux-kernel@...r.kernel.org, x86@...nel.org,
        Asit Mallick <asit.k.mallick@...el.com>,
        Dave Hansen <dave.hansen@...el.com>,
        Arjan Van De Ven <arjan.van.de.ven@...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>,
        Dan Williams <dan.j.williams@...el.com>,
        Jun Nakajima <jun.nakajima@...el.com>,
        Andy Lutomirski <luto@...nel.org>,
        Greg KH <gregkh@...uxfoundation.org>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Ashok Raj <ashok.raj@...el.com>,
        David Woodhouse <dwmw@...zon.co.uk>
Subject: Re: [PATCH v6 3/5] KVM: VMX: Emulate MSR_IA32_ARCH_CAPABILITIES

On Thu, Feb 01, 2018 at 10:59:44PM +0100, KarimAllah Ahmed wrote:
> Intel processors use MSR_IA32_ARCH_CAPABILITIES MSR to indicate RDCL_NO
> (bit 0) and IBRS_ALL (bit 1). This is a read-only MSR. By default the
> contents will come directly from the hardware, but user-space can still
> override it.
> 
> [dwmw2: The bit in kvm_cpuid_7_0_edx_x86_features can be unconditional]
> 
> Cc: Asit Mallick <asit.k.mallick@...el.com>
> Cc: Dave Hansen <dave.hansen@...el.com>
> Cc: Arjan Van De Ven <arjan.van.de.ven@...el.com>
> Cc: Tim Chen <tim.c.chen@...ux.intel.com>
> Cc: Linus Torvalds <torvalds@...ux-foundation.org>
> Cc: Andrea Arcangeli <aarcange@...hat.com>
> Cc: Andi Kleen <ak@...ux.intel.com>
> Cc: Thomas Gleixner <tglx@...utronix.de>
> Cc: Dan Williams <dan.j.williams@...el.com>
> Cc: Jun Nakajima <jun.nakajima@...el.com>
> Cc: Andy Lutomirski <luto@...nel.org>
> Cc: Greg KH <gregkh@...uxfoundation.org>
> Cc: Paolo Bonzini <pbonzini@...hat.com>
> Cc: Ashok Raj <ashok.raj@...el.com>
> Reviewed-by: Paolo Bonzini <pbonzini@...hat.com>

Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>