Re: [PATCH v5 7/8] KVM: Pre-allocate cpumasks for kvm_make_all_cpus_request_except()

[PATCH v5 0/8] KVM: Various fixes and improvements around kicking vCPUs · Vitaly Kuznetsov <vkuznets@redhat.com> · 2021-09-03
[PATCH v5 3/8] KVM: x86: hyper-v: Avoid calling kvm_make_vcpus_request_mask() with vcpu_mask==NULL · Vitaly Kuznetsov <vkuznets@redhat.com> · 2021-09-03
[PATCH v5 1/8] KVM: Clean up benign vcpu->cpu data races when kicking vCPUs · Vitaly Kuznetsov <vkuznets@redhat.com> · 2021-09-03
Re: [PATCH v5 1/8] KVM: Clean up benign vcpu->cpu data races when kicking vCPUs · Lai Jiangshan <jiangshanlai@gmail.com> · 2021-09-04
[PATCH v5 2/8] KVM: KVM: Use cpumask_available() to check for NULL cpumask when kicking vCPUs · Vitaly Kuznetsov <vkuznets@redhat.com> · 2021-09-03
[PATCH v5 4/8] KVM: Optimize kvm_make_vcpus_request_mask() a bit · Vitaly Kuznetsov <vkuznets@redhat.com> · 2021-09-03
Re: [PATCH v5 4/8] KVM: Optimize kvm_make_vcpus_request_mask() a bit · Sean Christopherson <seanjc@google.com> · 2021-09-03
[PATCH v5 7/8] KVM: Pre-allocate cpumasks for kvm_make_all_cpus_request_except() · Vitaly Kuznetsov <vkuznets@redhat.com> · 2021-09-03
Re: [PATCH v5 7/8] KVM: Pre-allocate cpumasks for kvm_make_all_cpus_request_except() · Sean Christopherson <seanjc@google.com> · 2021-09-03
[PATCH v5 5/8] KVM: Drop 'except' parameter from kvm_make_vcpus_request_mask() · Vitaly Kuznetsov <vkuznets@redhat.com> · 2021-09-03
[PATCH v5 6/8] KVM: x86: Fix stack-out-of-bounds memory access from ioapic_write_indirect() · Vitaly Kuznetsov <vkuznets@redhat.com> · 2021-09-03
[PATCH v5 8/8] KVM: Make kvm_make_vcpus_request_mask() use pre-allocated cpu_kick_mask · Vitaly Kuznetsov <vkuznets@redhat.com> · 2021-09-03
Re: [PATCH v5 8/8] KVM: Make kvm_make_vcpus_request_mask() use pre-allocated cpu_kick_mask · Sean Christopherson <seanjc@google.com> · 2021-09-03
Re: [PATCH v5 8/8] KVM: Make kvm_make_vcpus_request_mask() use pre-allocated cpu_kick_mask · Vitaly Kuznetsov <vkuznets@redhat.com> · 2021-09-06
Re: [PATCH v5 0/8] KVM: Various fixes and improvements around kicking vCPUs · Vitaly Kuznetsov <vkuznets@redhat.com> · 2021-09-20
Re: [PATCH v5 0/8] KVM: Various fixes and improvements around kicking vCPUs · Paolo Bonzini <pbonzini@redhat.com> · 2021-09-20
Re: [PATCH v5 0/8] KVM: Various fixes and improvements around kicking vCPUs · Paolo Bonzini <pbonzini@redhat.com> · 2021-09-24

From: Sean Christopherson <seanjc@google.com>
Date: 2021-09-03 16:25:05
Also in: lkml

On Fri, Sep 03, 2021, Vitaly Kuznetsov wrote:

Allocating cpumask dynamically in zalloc_cpumask_var() is not ideal.
Allocation is somewhat slow and can (in theory and when CPUMASK_OFFSTACK)
fail. kvm_make_all_cpus_request_except() already disables preemption so
we can use pre-allocated per-cpu cpumasks instead.

Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
---

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

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