linux-kernel - Re: [PATCH RFC v3 1/9] KVM: s390: optimize detection of started vcpus

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Date:   Tue, 29 Aug 2017 13:26:35 +0200
From:   Cornelia Huck <cohuck@...hat.com>
To:     Radim Krčmář <rkrcmar@...hat.com>
Cc:     linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
        linux-mips@...ux-mips.org, kvm-ppc@...r.kernel.org,
        linux-s390@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        Paolo Bonzini <pbonzini@...hat.com>,
        David Hildenbrand <david@...hat.com>,
        Christoffer Dall <cdall@...aro.org>,
        Marc Zyngier <marc.zyngier@....com>,
        Christian Borntraeger <borntraeger@...ibm.com>,
        James Hogan <james.hogan@...tec.com>,
        Paul Mackerras <paulus@...abs.org>,
        Alexander Graf <agraf@...e.com>
Subject: Re: [PATCH RFC v3 1/9] KVM: s390: optimize detection of started
 vcpus

On Mon, 21 Aug 2017 22:35:22 +0200
Radim Krčmář <rkrcmar@...hat.com> wrote:

> We can add a variable instead of scanning all online VCPUs to know how
> many are started.  We can't trivially tell which VCPU is the last one,
> though.
> 
> Suggested-by: Cornelia Huck <cohuck@...hat.com>
> Signed-off-by: Radim Krčmář <rkrcmar@...hat.com>
> ---
>  arch/s390/include/asm/kvm_host.h |  1 +
>  arch/s390/kvm/kvm-s390.c         | 39 +++++++++++++++------------------------
>  2 files changed, 16 insertions(+), 24 deletions(-)

Modulo the bug noticed by Christian, I think this looks good.