linux-kernel - Re: [PATCH v2 2/3] KVM: x86: generalize guest_cpuid_has

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Message-ID: <91f75360-7171-c0e1-cdbc-50abec5851a3@redhat.com>
Date:   Mon, 7 Aug 2017 10:34:29 +0200
From:   David Hildenbrand <david@...hat.com>
To:     Radim Krčmář <rkrcmar@...hat.com>,
        linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Cc:     Paolo Bonzini <pbonzini@...hat.com>
Subject: Re: [PATCH v2 2/3] KVM: x86: generalize guest_cpuid_has_ helpers

On 05.08.2017 00:12, Radim Krčmář wrote:
> This patch turns guest_cpuid_has_XYZ(cpuid) into guest_cpuid_has(cpuid,
> X86_FEATURE_XYZ), which gets rid of many very similar helpers.
> 
> When seeing a X86_FEATURE_*, we can know which cpuid it belongs to, but
> this information isn't in common code, so we recreate it for KVM.
> 
> Add some BUILD_BUG_ONs to make sure that it runs nicely.
> 
> Signed-off-by: Radim Krčmář <rkrcmar@...hat.com>
> ---
> v2:
>  - fixed X86_FEATURE_RDTSCP (David)
>  - renamed best to entry (David)
>  - added const (David)
>  - added __always_inline (Paolo)
> ---
>  arch/x86/kvm/cpuid.h | 170 +++++++++++++++++----------------------------------
>  arch/x86/kvm/mmu.c   |   7 ++-
>  arch/x86/kvm/mtrr.c  |   2 +-
>  arch/x86/kvm/svm.c   |   2 +-
>  arch/x86/kvm/vmx.c   |  26 ++++----
>  arch/x86/kvm/x86.c   |  38 ++++++------
>  6 files changed, 95 insertions(+), 150 deletions(-)
> 

Reviewed-by: David Hildenbrand <david@...hat.com>


-- 

Thanks,

David