linux-kernel - Re: [PATCH] kvm_host: unify VM_STAT and VCPU

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Date:   Tue, 14 Apr 2020 10:18:58 +0200
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Philippe Mathieu-Daudé <f4bug@...at.org>,
        Emanuele Giuseppe Esposito <eesposit@...hat.com>,
        kvm@...r.kernel.org
Cc:     Marc Zyngier <maz@...nel.org>, James Morse <james.morse@....com>,
        Julien Thierry <julien.thierry.kdev@...il.com>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        Paul Mackerras <paulus@...abs.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Christian Borntraeger <borntraeger@...ibm.com>,
        Janosch Frank <frankja@...ux.ibm.com>,
        David Hildenbrand <david@...hat.com>,
        Cornelia Huck <cohuck@...hat.com>,
        Sean Christopherson <sean.j.christopherson@...el.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>,
        linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.cs.columbia.edu,
        linux-kernel@...r.kernel.org, linux-mips@...r.kernel.org,
        kvm-ppc@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        linux-s390@...r.kernel.org
Subject: Re: [PATCH] kvm_host: unify VM_STAT and VCPU_STAT definitions in a
 single place

On 13/04/20 23:34, Philippe Mathieu-Daudé wrote:
>> +#define VM_STAT(x, ...) offsetof(struct kvm, stat.x), KVM_STAT_VM, ## __VA_ARGS__
>> +#define VCPU_STAT(x, ...) offsetof(struct kvm_vcpu, stat.x), KVM_STAT_VCPU, ## __VA_ARGS__
> I find this macro expanding into multiple fields odd... Maybe a matter
> of taste. Sugggestion, have the macro define the full structure, as in
> the arm64 arch:
> 
> #define VM_STAT(n, x, ...) { n, offsetof(struct kvm, stat.x),
> KVM_STAT_VM, ## __VA_ARGS__ }
> 
> Ditto for VCPU_STAT().
> 

Yes, that's a good idea.  Emanuele, can you switch it to this format?

Thanks,

Paolo