linux-kernel - Re: [PATCH v3] X86/VMX: Disable VMX preemption timer if MWAIT is not intercepted

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Message-ID: <20180410162136.GA6602@char.us.oracle.com>
Date:   Tue, 10 Apr 2018 12:21:36 -0400
From:   Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
To:     KarimAllah Ahmed <karahmed@...zon.de>
Cc:     kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
        Paolo Bonzini <pbonzini@...hat.com>,
        Radim Krčmář <rkrcmar@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H . Peter Anvin" <hpa@...or.com>, x86@...nel.org
Subject: Re: [PATCH v3] X86/VMX: Disable VMX preemption timer if MWAIT is not
 intercepted

On Tue, Apr 10, 2018 at 02:15:46PM +0200, KarimAllah Ahmed wrote:
> The VMX-preemption timer is used by KVM as a way to set deadlines for the
> guest (i.e. timer emulation). That was safe till very recently when
> capability KVM_X86_DISABLE_EXITS_MWAIT to disable intercepting MWAIT was
> introduced. According to Intel SDM 25.5.1:

Would it make sense to remove the '25.5.1' and just have the chapter name, etc
as those do move around?