linux-kernel - Re: [PATCH 1/5] KVM: Pass kvm_init()'s opaque param to additional arch funcs

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Date:   Fri, 31 Jan 2020 13:06:15 +0100
From:   Cornelia Huck <cohuck@...hat.com>
To:     Sean Christopherson <sean.j.christopherson@...el.com>
Cc:     Paolo Bonzini <pbonzini@...hat.com>,
        Paul Mackerras <paulus@...abs.org>,
        Christian Borntraeger <borntraeger@...ibm.com>,
        Janosch Frank <frankja@...ux.ibm.com>,
        David Hildenbrand <david@...hat.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>, Marc Zyngier <maz@...nel.org>,
        James Morse <james.morse@....com>,
        Julien Thierry <julien.thierry.kdev@...il.com>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        linux-mips@...r.kernel.org, kvm@...r.kernel.org,
        kvm-ppc@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        kvmarm@...ts.cs.columbia.edu, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/5] KVM: Pass kvm_init()'s opaque param to additional
 arch funcs

On Wed, 29 Jan 2020 16:10:19 -0800
Sean Christopherson <sean.j.christopherson@...el.com> wrote:

> Pass @opaque to kvm_arch_hardware_setup() and
> kvm_arch_check_processor_compat() to allow architecture specific code to
> reference @opaque without having to stash it away in a temporary global
> variable.  This will enable x86 to separate its vendor specific callback
> ops, which are passed via @opaque, into "init" and "runtime" ops without
> having to stash away the "init" ops.
> 
> No functional change intended.
> 
> Signed-off-by: Sean Christopherson <sean.j.christopherson@...el.com>
> ---
>  arch/mips/kvm/mips.c       |  4 ++--
>  arch/powerpc/kvm/powerpc.c |  4 ++--
>  arch/s390/kvm/kvm-s390.c   |  4 ++--
>  arch/x86/kvm/x86.c         |  4 ++--
>  include/linux/kvm_host.h   |  4 ++--
>  virt/kvm/arm/arm.c         |  4 ++--
>  virt/kvm/kvm_main.c        | 18 ++++++++++++++----
>  7 files changed, 26 insertions(+), 16 deletions(-)

> diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
> index eb3709d55139..5ad252defa54 100644
> --- a/virt/kvm/kvm_main.c
> +++ b/virt/kvm/kvm_main.c
> @@ -4345,14 +4345,22 @@ struct kvm_vcpu * __percpu *kvm_get_running_vcpus(void)
>          return &kvm_running_vcpu;
>  }
>  
> -static void check_processor_compat(void *rtn)
> +struct kvm_cpu_compat_check {
> +	void *opaque;
> +	int *ret;
> +};
> +
> +static void check_processor_compat(void *data)
>  {
> -	*(int *)rtn = kvm_arch_check_processor_compat();
> +	struct kvm_cpu_compat_check *c = data;
> +
> +	*c->ret = kvm_arch_check_processor_compat(c->opaque);
>  }

This function also looks better now :)

Reviewed-by: Cornelia Huck <cohuck@...hat.com>
Tested-by: Cornelia Huck <cohuck@...hat.com> #s390