linux-kernel - RE: [PATCH v3 04/11] KVM: SVM: Modify intercept

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Date:   Wed, 29 Jul 2020 16:31:28 -0500
From:   Babu Moger <babu.moger@....com>
To:     Jim Mattson <jmattson@...gle.com>
Cc:     Paolo Bonzini <pbonzini@...hat.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Sean Christopherson <sean.j.christopherson@...el.com>,
        kvm list <kvm@...r.kernel.org>, Joerg Roedel <joro@...tes.org>,
        the arch/x86 maintainers <x86@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "H . Peter Anvin" <hpa@...or.com>,
        Thomas Gleixner <tglx@...utronix.de>
Subject: RE: [PATCH v3 04/11] KVM: SVM: Modify intercept_exceptions to generic
 intercepts



> -----Original Message-----
> From: Jim Mattson <jmattson@...gle.com>
> Sent: Wednesday, July 29, 2020 3:48 PM
> To: Moger, Babu <Babu.Moger@....com>
> Cc: Paolo Bonzini <pbonzini@...hat.com>; Vitaly Kuznetsov
> <vkuznets@...hat.com>; Wanpeng Li <wanpengli@...cent.com>; Sean
> Christopherson <sean.j.christopherson@...el.com>; kvm list
> <kvm@...r.kernel.org>; Joerg Roedel <joro@...tes.org>; the arch/x86
> maintainers <x86@...nel.org>; LKML <linux-kernel@...r.kernel.org>; Ingo
> Molnar <mingo@...hat.com>; Borislav Petkov <bp@...en8.de>; H . Peter Anvin
> <hpa@...or.com>; Thomas Gleixner <tglx@...utronix.de>
> Subject: Re: [PATCH v3 04/11] KVM: SVM: Modify intercept_exceptions to
> generic intercepts
> 
> On Tue, Jul 28, 2020 at 4:38 PM Babu Moger <babu.moger@....com> wrote:
> >
> > Modify intercept_exceptions to generic intercepts in vmcb_control_area.
> > Use the generic __set_intercept, __clr_intercept and __is_intercept to
> > set the intercept_exceptions bits.
> >
> > Signed-off-by: Babu Moger <babu.moger@....com>
> > ---
> 
> > @@ -52,6 +54,25 @@ enum {
> >         INTERCEPT_DR5_WRITE,
> >         INTERCEPT_DR6_WRITE,
> >         INTERCEPT_DR7_WRITE,
> > +       /* Byte offset 008h (Vector 2) */
> > +       INTERCEPT_DE_VECTOR = 64 + DE_VECTOR,
> > +       INTERCEPT_DB_VECTOR,
> > +       INTERCEPT_BP_VECTOR = 64 + BP_VECTOR,
> > +       INTERCEPT_OF_VECTOR,
> > +       INTERCEPT_BR_VECTOR,
> > +       INTERCEPT_UD_VECTOR,
> > +       INTERCEPT_NM_VECTOR,
> > +       INTERCEPT_DF_VECTOR,
> > +       INTERCEPT_TS_VECTOR = 64 + TS_VECTOR,
> > +       INTERCEPT_NP_VECTOR,
> > +       INTERCEPT_SS_VECTOR,
> > +       INTERCEPT_GP_VECTOR,
> > +       INTERCEPT_PF_VECTOR,
> > +       INTERCEPT_MF_VECTOR = 64 + MF_VECTOR,
> > +       INTERCEPT_AC_VECTOR,
> > +       INTERCEPT_MC_VECTOR,
> > +       INTERCEPT_XM_VECTOR,
> > +       INTERCEPT_VE_VECTOR,
> >  };
> 
> I think it's demanding a lot of the reader to know where there are and are not
> gaps in the allocated hardware exception vectors. Perhaps all of the above
> enumeration definitions could have initializers? Either way...

Sure. Will add all the initializers here. Thanks

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