linux-kernel - Re: [PATCH 3/3] KVM: VMX: mark RDMSR path as unlikely

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Date:   Wed, 21 Feb 2018 16:25:15 -0800
From:   Jim Mattson <jmattson@...gle.com>
To:     Paolo Bonzini <pbonzini@...hat.com>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        kvm list <kvm@...r.kernel.org>,
        "the arch/x86 maintainers" <x86@...nel.org>,
        Radim Krčmář <rkrcmar@...hat.com>,
        KarimAllah Ahmed <karahmed@...zon.de>,
        David Woodhouse <dwmw@...zon.co.uk>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...nel.org>, stable@...r.kernel.org
Subject: Re: [PATCH 3/3] KVM: VMX: mark RDMSR path as unlikely

On Wed, Feb 21, 2018 at 1:41 PM, Paolo Bonzini <pbonzini@...hat.com> wrote:
> vmx_vcpu_run and svm_vcpu_run are large functions, and this can actually
> make a substantial cycle difference by keeping the fast path contiguous
> in memory.  Without it, the retpoline guest/retpoline host case is about
> 50 cycles slower.
>
> Cc: x86@...nel.org
> Cc: Radim Krčmář <rkrcmar@...hat.com>
> Cc: KarimAllah Ahmed <karahmed@...zon.de>
> Cc: David Woodhouse <dwmw@...zon.co.uk>
> Cc: Jim Mattson <jmattson@...gle.com>
> Cc: Thomas Gleixner <tglx@...utronix.de>
> Cc: Ingo Molnar <mingo@...nel.org>
> Cc: stable@...r.kernel.org
> Signed-off-by: Paolo Bonzini <pbonzini@...hat.com>

Reviewed-by: Jim Mattson <jmattson@...gle.com>