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[91.219.240.2]) by smtp.gmail.com with ESMTPSA id o12sm6471190wmr.2.2021.09.06.00.23.53 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 06 Sep 2021 00:23:53 -0700 (PDT) From: Vitaly Kuznetsov To: Sean Christopherson Cc: kvm@vger.kernel.org, Paolo Bonzini , Wanpeng Li , Jim Mattson , "Dr. David Alan Gilbert" , Nitesh Narayan Lal , Lai Jiangshan , Maxim Levitsky , Eduardo Habkost , linux-kernel@vger.kernel.org Subject: Re: [PATCH v5 8/8] KVM: Make kvm_make_vcpus_request_mask() use pre-allocated cpu_kick_mask In-Reply-To: References: <20210903075141.403071-1-vkuznets@redhat.com> <20210903075141.403071-9-vkuznets@redhat.com> Date: Mon, 06 Sep 2021 09:23:52 +0200 Message-ID: <87wnnu416f.fsf@vitty.brq.redhat.com> MIME-Version: 1.0 Content-Type: text/plain Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org Sean Christopherson writes: > On Fri, Sep 03, 2021, Vitaly Kuznetsov wrote: >> kvm_make_vcpus_request_mask() already disables preemption so just like >> kvm_make_all_cpus_request_except() it can be switched to using >> pre-allocated per-cpu cpumasks. This allows for improvements for both >> users of the function: in Hyper-V emulation code 'tlb_flush' can now be >> dropped from 'struct kvm_vcpu_hv' and kvm_make_scan_ioapic_request_mask() >> gets rid of dynamic allocation. >> >> cpumask_available() checks in kvm_make_vcpu_request() and >> kvm_kick_many_cpus() can now be dropped as they checks for an impossible >> condition: kvm_init() makes sure per-cpu masks are allocated. >> >> Signed-off-by: Vitaly Kuznetsov >> --- > > Reviewed-by: Sean Christopherson > Thanks! >> diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c >> index a4752dcc2a75..91c1e6c98b0f 100644 >> --- a/arch/x86/kvm/x86.c >> +++ b/arch/x86/kvm/x86.c >> @@ -9224,14 +9224,8 @@ static void process_smi(struct kvm_vcpu *vcpu) >> void kvm_make_scan_ioapic_request_mask(struct kvm *kvm, >> unsigned long *vcpu_bitmap) >> { >> - cpumask_var_t cpus; >> - >> - zalloc_cpumask_var(&cpus, GFP_ATOMIC); >> - >> kvm_make_vcpus_request_mask(kvm, KVM_REQ_SCAN_IOAPIC, >> - vcpu_bitmap, cpus); >> - >> - free_cpumask_var(cpus); >> + vcpu_bitmap); > > Nit, this can all go on a single line. > Sorry, you've mentioned this on v4 but I forgot. Hope this can be fixed upon commit... >> } >> >> void kvm_make_scan_ioapic_request(struct kvm *kvm) > -- Vitaly