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Date: Fri, 2 Feb 2018 13:02:53 -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>,
Arjan Van De Ven <arjan.van.de.ven@...el.com>,
Dave Hansen <dave.hansen@...el.com>,
Andi Kleen <ak@...ux.intel.com>,
Andrea Arcangeli <aarcange@...hat.com>,
Linus Torvalds <torvalds@...ux-foundation.org>,
Tim Chen <tim.c.chen@...ux.intel.com>,
Thomas Gleixner <tglx@...utronix.de>,
Dan Williams <dan.j.williams@...el.com>,
Jun Nakajima <jun.nakajima@...el.com>,
Paolo Bonzini <pbonzini@...hat.com>,
David Woodhouse <dwmw@...zon.co.uk>,
Greg KH <gregkh@...uxfoundation.org>,
Andy Lutomirski <luto@...nel.org>,
Ashok Raj <ashok.raj@...el.com>
Subject: Re: [PATCH v6 5/5] KVM: SVM: Allow direct access to
MSR_IA32_SPEC_CTRL
On Thu, Feb 01, 2018 at 10:59:46PM +0100, KarimAllah Ahmed wrote:
> [ Based on a patch from Paolo Bonzini <pbonzini@...hat.com> ]
>
> ... basically doing exactly what we do for VMX:
>
> - Passthrough SPEC_CTRL to guests (if enabled in guest CPUID)
> - Save and restore SPEC_CTRL around VMExit and VMEntry only if the guest
> actually used it.
>
> Cc: Asit Mallick <asit.k.mallick@...el.com>
> Cc: Arjan Van De Ven <arjan.van.de.ven@...el.com>
> Cc: Dave Hansen <dave.hansen@...el.com>
> Cc: Andi Kleen <ak@...ux.intel.com>
> Cc: Andrea Arcangeli <aarcange@...hat.com>
> Cc: Linus Torvalds <torvalds@...ux-foundation.org>
> Cc: Tim Chen <tim.c.chen@...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: Paolo Bonzini <pbonzini@...hat.com>
> Cc: David Woodhouse <dwmw@...zon.co.uk>
> Cc: Greg KH <gregkh@...uxfoundation.org>
> Cc: Andy Lutomirski <luto@...nel.org>
> Cc: Ashok Raj <ashok.raj@...el.com>
> Signed-off-by: KarimAllah Ahmed <karahmed@...zon.de>
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
> + { .index = MSR_IA32_SPEC_CTRL, .always = false },
This .always = [false|true] field keeps throwing me off.
So glad: https://www.spinics.net/lists/kvm/msg161606.html explains it better.
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