linux-kernel - Re: [V2 PATCH 7/8] Kvm: selftests: x86: Execute cpu specific vmcall instruction

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Date:   Mon, 26 Sep 2022 16:35:54 -0700
From:   Vishal Annapurve <vannapurve@...gle.com>
To:     David Matlack <dmatlack@...gle.com>
Cc:     x86 <x86@...nel.org>, kvm list <kvm@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        linux-kselftest@...r.kernel.org,
        Paolo Bonzini <pbonzini@...hat.com>, shuah <shuah@...nel.org>,
        Ben Gardon <bgardon@...gle.com>,
        Sean Christopherson <seanjc@...gle.com>,
        Oliver Upton <oupton@...gle.com>, peterx@...hat.com,
        Vitaly Kuznetsov <vkuznets@...hat.com>
Subject: Re: [V2 PATCH 7/8] Kvm: selftests: x86: Execute cpu specific vmcall instruction

On Wed, Sep 21, 2022 at 2:43 PM David Matlack <dmatlack@...gle.com> wrote:
>
> On Thu, Sep 15, 2022 at 12:04:47AM +0000, Vishal Annapurve wrote:
> > Update the vmcall instruction invocation to happen according to the cpu
> > type.
> >
> > Suggested-by: Sean Christopherson <seanjc@...gle.com>
> > Signed-off-by: Vishal Annapurve <vannapurve@...gle.com>
> > ---
> >  tools/testing/selftests/kvm/include/x86_64/processor.h    | 8 ++++++++
> >  tools/testing/selftests/kvm/x86_64/vmx_apic_access_test.c | 2 +-
> >  .../selftests/kvm/x86_64/vmx_nested_tsc_scaling_test.c    | 2 +-
> >  tools/testing/selftests/kvm/x86_64/vmx_tsc_adjust_test.c  | 2 +-
>
> What's the reason to use kvm_hypercall() for these tests? All of these
> are Intel-specific. i.e. is_amd_cpu() will always return false.
>

That's right. This change is attempting to have hypercalls from guest
code done via a common API as far as possible.

> >  4 files changed, 11 insertions(+), 3 deletions(-)
> >
> > diff --git a/tools/testing/selftests/kvm/include/x86_64/processor.h b/tools/testing/selftests/kvm/include/x86_64/processor.h
> > ...
> > --
> > 2.37.2.789.g6183377224-goog
> >