Re: [PATCH] KVM: Directly return result from kvm_arch_check_processor_compat()

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On Fri, 19 Apr 2019 22:18:17 -0700
Sean Christopherson <sean.j.christopherson@xxxxxxxxx> wrote:

> Add a wrapper to invoke kvm_arch_check_processor_compat() so that the
> boilerplate ugliness of checking virtualization support on all CPUs is
> hidden from the arch specific code.  x86's implementation in particular
> is quite heinous, as it unnecessarily propagates the out-param pattern
> into kvm_x86_ops.
> 
> While the x86 specific issue could be resolved solely by changing
> kvm_x86_ops, make the change for all architectures as returning a value
> directly is prettier and technically more robust, e.g. s390 doesn't set
> the out param, which could lead to subtle breakage in the (highly
> unlikely) scenario where the out-param was not pre-initialized by the
> caller.
> 
> Opportunistically annotate svm_check_processor_compat() with __init.
> 
> Signed-off-by: Sean Christopherson <sean.j.christopherson@xxxxxxxxx>
> ---
> 
> Tested on VMX only.
> 
>  arch/mips/kvm/mips.c             | 4 ++--
>  arch/powerpc/kvm/powerpc.c       | 4 ++--
>  arch/s390/include/asm/kvm_host.h | 1 -
>  arch/s390/kvm/kvm-s390.c         | 5 +++++
>  arch/x86/include/asm/kvm_host.h  | 2 +-
>  arch/x86/kvm/svm.c               | 4 ++--
>  arch/x86/kvm/vmx/vmx.c           | 8 ++++----
>  arch/x86/kvm/x86.c               | 4 ++--
>  include/linux/kvm_host.h         | 2 +-
>  virt/kvm/arm/arm.c               | 4 ++--
>  virt/kvm/kvm_main.c              | 9 ++++++---
>  11 files changed, 27 insertions(+), 20 deletions(-)

Yes, this does look nicer.

Reviewed-by: Cornelia Huck <cohuck@xxxxxxxxxx>



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