linux-kernel - RE: [PATCH v13 06/12] KVM: x86: Add Intel PT virtualization work mode

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Date:   Tue, 30 Oct 2018 10:30:00 +0100 (CET)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     "Kang, Luwei" <luwei.kang@...el.com>
cc:     Jim Mattson <jmattson@...gle.com>, kvm list <kvm@...r.kernel.org>,
        the arch/x86 maintainers <x86@...nel.org>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "H . Peter Anvin" <hpa@...or.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Radim Krčmář <rkrcmar@...hat.com>,
        Joerg Roedel <joro@...tes.org>,
        "songliubraving@...com" <songliubraving@...com>,
        Peter Zijlstra <peterz@...radead.org>,
        "alexander.shishkin@...ux.intel.com" 
        <alexander.shishkin@...ux.intel.com>,
        "kstewart@...uxfoundation.org" <kstewart@...uxfoundation.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Tom Lendacky <thomas.lendacky@....com>,
        Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
        "mattst88@...il.com" <mattst88@...il.com>,
        Janakarajan Natarajan <Janakarajan.Natarajan@....com>,
        David Woodhouse <dwmw@...zon.co.uk>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Marc Orr <marcorr@...gle.com>, Uros Bizjak <ubizjak@...il.com>,
        "Christopherson, Sean J" <sean.j.christopherson@...el.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Chao Peng <chao.p.peng@...ux.intel.com>
Subject: RE: [PATCH v13 06/12] KVM: x86: Add Intel PT virtualization work
 mode

Kang,

On Thu, 25 Oct 2018, Kang, Luwei wrote:
> > > +#define SECONDARY_EXEC_PT_USE_GPA              0x01000000
> > > +#define VM_EXIT_CLEAR_IA32_RTIT_CTL            0x02000000
> > > +#define VM_ENTRY_LOAD_IA32_RTIT_CTL            0x00040000
> > 
> > Where are all of these bits documented? I'm looking at the latest SDM, volume 3 (325384-067US), and none of these bits aredocumented
> > there.
> 
> This part is in the " Intel® Architecture Instruction Set Extensions and Future Features Programming Reference"
> https://software.intel.com/sites/default/files/managed/c5/15/architecture-instruction-set-extensions-programming-reference.pdf
>

Yet another PDF which will change it's location sooner than later. Can you
please stick that into the kernel.org bugzilla and reference the BZ in the
change log, so we have something for posterity?

Thanks,

	tglx