linux-kernel - Re: [PATCH v3 03/11] KVM: SVM: Change intercept

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Message-ID: <CALMp9eRF-ScqaWG7vn2mxKmR4jWo7LYZiiicHksiZR9hh+G=-A@mail.gmail.com>
Date:   Tue, 28 Jul 2020 16:59:20 -0700
From:   Jim Mattson <jmattson@...gle.com>
To:     Babu Moger <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 03/11] KVM: SVM: Change intercept_dr to generic intercepts

On Tue, Jul 28, 2020 at 4:38 PM Babu Moger <babu.moger@....com> wrote:
>
> Modify intercept_dr to generic intercepts in vmcb_control_area.
> Use generic __set_intercept, __clr_intercept and __is_intercept
> to set/clear/test the intercept_dr bits.
>
> Signed-off-by: Babu Moger <babu.moger@....com>
> ---
>  arch/x86/include/asm/svm.h |   36 ++++++++++++++++++------------------
>  arch/x86/kvm/svm/nested.c  |    6 +-----
>  arch/x86/kvm/svm/svm.c     |    4 ++--
>  arch/x86/kvm/svm/svm.h     |   34 +++++++++++++++++-----------------
>  4 files changed, 38 insertions(+), 42 deletions(-)
>
> diff --git a/arch/x86/include/asm/svm.h b/arch/x86/include/asm/svm.h
> index d4739f4eae63..ffc89d8e4fcb 100644
> --- a/arch/x86/include/asm/svm.h
> +++ b/arch/x86/include/asm/svm.h
> @@ -11,6 +11,7 @@
>
>  enum vector_offset {
>         CR_VECTOR = 0,
> +       DR_VECTOR,
>         MAX_VECTORS,
>  };
>
> @@ -34,6 +35,23 @@ enum {
>         INTERCEPT_CR6_WRITE,
>         INTERCEPT_CR7_WRITE,
>         INTERCEPT_CR8_WRITE,
> +       /* Byte offset 004h (Vector 1) */
> +       INTERCEPT_DR0_READ = 32,
> +       INTERCEPT_DR1_READ,
> +       INTERCEPT_DR2_READ,
> +       INTERCEPT_DR3_READ,
> +       INTERCEPT_DR4_READ,
> +       INTERCEPT_DR5_READ,
> +       INTERCEPT_DR6_READ,
> +       INTERCEPT_DR7_READ,
> +       INTERCEPT_DR0_WRITE = 48,
> +       INTERCEPT_DR1_WRITE,
> +       INTERCEPT_DR2_WRITE,
> +       INTERCEPT_DR3_WRITE,
> +       INTERCEPT_DR4_WRITE,
> +       INTERCEPT_DR5_WRITE,
> +       INTERCEPT_DR6_WRITE,
> +       INTERCEPT_DR7_WRITE,
>  };
>
>  enum {
> @@ -89,7 +107,6 @@ enum {
>
>  struct __attribute__ ((__packed__)) vmcb_control_area {
>         u32 intercepts[MAX_VECTORS];
> -       u32 intercept_dr;
>         u32 intercept_exceptions;
>         u64 intercept;
>         u8 reserved_1[40];
> @@ -271,23 +288,6 @@ struct __attribute__ ((__packed__)) vmcb {
>  #define SVM_SELECTOR_READ_MASK SVM_SELECTOR_WRITE_MASK
>  #define SVM_SELECTOR_CODE_MASK (1 << 3)
>
> -#define INTERCEPT_DR0_READ     0
> -#define INTERCEPT_DR1_READ     1
> -#define INTERCEPT_DR2_READ     2
> -#define INTERCEPT_DR3_READ     3
> -#define INTERCEPT_DR4_READ     4
> -#define INTERCEPT_DR5_READ     5
> -#define INTERCEPT_DR6_READ     6
> -#define INTERCEPT_DR7_READ     7
> -#define INTERCEPT_DR0_WRITE    (16 + 0)
> -#define INTERCEPT_DR1_WRITE    (16 + 1)
> -#define INTERCEPT_DR2_WRITE    (16 + 2)
> -#define INTERCEPT_DR3_WRITE    (16 + 3)
> -#define INTERCEPT_DR4_WRITE    (16 + 4)
> -#define INTERCEPT_DR5_WRITE    (16 + 5)
> -#define INTERCEPT_DR6_WRITE    (16 + 6)
> -#define INTERCEPT_DR7_WRITE    (16 + 7)
> -
>  #define SVM_EVTINJ_VEC_MASK 0xff
>
>  #define SVM_EVTINJ_TYPE_SHIFT 8
> diff --git a/arch/x86/kvm/svm/nested.c b/arch/x86/kvm/svm/nested.c
> index 46f5c82d9b45..71ca89afb2a3 100644
> --- a/arch/x86/kvm/svm/nested.c
> +++ b/arch/x86/kvm/svm/nested.c
> @@ -121,7 +121,6 @@ void recalc_intercepts(struct vcpu_svm *svm)
>         for (i = 0; i < MAX_VECTORS; i++)
>                 c->intercepts[i] = h->intercepts[i];
>
> -       c->intercept_dr = h->intercept_dr;
>         c->intercept_exceptions = h->intercept_exceptions;
>         c->intercept = h->intercept;
>
> @@ -144,7 +143,6 @@ void recalc_intercepts(struct vcpu_svm *svm)
>         for (i = 0; i < MAX_VECTORS; i++)
>                 c->intercepts[i] |= g->intercepts[i];
>
> -       c->intercept_dr |= g->intercept_dr;
>         c->intercept_exceptions |= g->intercept_exceptions;
>         c->intercept |= g->intercept;
>  }
> @@ -157,7 +155,6 @@ static void copy_vmcb_control_area(struct vmcb_control_area *dst,
>         for (i = 0; i < MAX_VECTORS; i++)
>                 dst->intercepts[i] = from->intercepts[i];
>
> -       dst->intercept_dr         = from->intercept_dr;
>         dst->intercept_exceptions = from->intercept_exceptions;
>         dst->intercept            = from->intercept;
>         dst->iopm_base_pa         = from->iopm_base_pa;
> @@ -717,8 +714,7 @@ static int nested_svm_intercept(struct vcpu_svm *svm)
>                 break;
>         }
>         case SVM_EXIT_READ_DR0 ... SVM_EXIT_WRITE_DR7: {
> -               u32 bit = 1U << (exit_code - SVM_EXIT_READ_DR0);
> -               if (svm->nested.ctl.intercept_dr & bit)
> +               if (__is_intercept(&svm->nested.ctl.intercepts, exit_code))

Can I assume that all of these __<function> calls will become
<function> calls when the grand unification is done? (Maybe I should
just look ahead.)