linux-kernel - Re: [PATCH v4 3/8] KVM: x86: hyper-v: Avoid calling kvm_make_vcpus_request_mask() with vcpu

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Date:   Thu, 2 Sep 2021 20:57:10 +0000
From:   Sean Christopherson <seanjc@...gle.com>
To:     Vitaly Kuznetsov <vkuznets@...hat.com>
Cc:     kvm@...r.kernel.org, Paolo Bonzini <pbonzini@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        "Dr. David Alan Gilbert" <dgilbert@...hat.com>,
        Nitesh Narayan Lal <nitesh@...hat.com>,
        Lai Jiangshan <jiangshanlai@...il.com>,
        Maxim Levitsky <mlevitsk@...hat.com>,
        Eduardo Habkost <ehabkost@...hat.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 3/8] KVM: x86: hyper-v: Avoid calling
 kvm_make_vcpus_request_mask() with vcpu_mask==NULL

On Fri, Aug 27, 2021, Vitaly Kuznetsov wrote:
> In preparation to making kvm_make_vcpus_request_mask() use for_each_set_bit()
> switch kvm_hv_flush_tlb() to calling kvm_make_all_cpus_request() for 'all cpus'
> case.
> 
> Note: kvm_make_all_cpus_request() (unlike kvm_make_vcpus_request_mask())
> currently dynamically allocates cpumask on each call and this is suboptimal.
> Both kvm_make_all_cpus_request() and kvm_make_vcpus_request_mask() are
> going to be switched to using pre-allocated per-cpu masks.
> 
> Signed-off-by: Vitaly Kuznetsov <vkuznets@...hat.com>
> ---

Reviewed-by: Sean Christopherson <seanjc@...gle.com>