linux-kernel - Re: [PATCH v4 2/5] KVM: x86: hyperv: optimize 'all cpus' case in kvm_hv_flush

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Message-ID: <20180709181916.GB3017@rkaganb.sw.ru>
Date:   Mon, 9 Jul 2018 21:19:17 +0300
From:   Roman Kagan <rkagan@...tuozzo.com>
To:     Vitaly Kuznetsov <vkuznets@...hat.com>
Cc:     kvm@...r.kernel.org, Paolo Bonzini <pbonzini@...hat.com>,
        Radim Krčmář <rkrcmar@...hat.com>,
        "K. Y. Srinivasan" <kys@...rosoft.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        "Michael Kelley (EOSG)" <Michael.H.Kelley@...rosoft.com>,
        Mohammed Gamal <mmorsy@...hat.com>,
        Cathy Avery <cavery@...hat.com>,
        Wanpeng Li <wanpeng.li@...mail.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 2/5] KVM: x86: hyperv: optimize 'all cpus' case in
 kvm_hv_flush_tlb()

On Tue, Jul 03, 2018 at 03:42:03PM +0200, Vitaly Kuznetsov wrote:
> We can use 'NULL' to represent 'all cpus' case in
> kvm_make_vcpus_request_mask() and avoid building vCPU mask with
> all vCPUs.
> 
> Suggested-by: Radim Krčmář <rkrcmar@...hat.com>
> Signed-off-by: Vitaly Kuznetsov <vkuznets@...hat.com>
> ---
>  arch/x86/kvm/hyperv.c | 42 +++++++++++++++++++++++-------------------
>  virt/kvm/kvm_main.c   |  6 ++----
>  2 files changed, 25 insertions(+), 23 deletions(-)

Reviewed-by: Roman Kagan <rkagan@...tuozzo.com>