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| author |   Vitaly Kuznetsov <vkuznets@redhat.com> | 2018-08-22 12:18:29 +0200 |
|---|---|---|
| committer |   Paolo Bonzini <pbonzini@redhat.com> | 2018-10-17 00:29:44 +0200 |
| commit | a812297c4fd9c2c9337b451ad8d66083c5b24ceb (patch) | |
| tree | 7d4da181f54955a033880395489b0d0fee13ccb7 /virt | |
| parent | KVM: x86: hyperv: enforce vp_index < KVM_MAX_VCPUS (diff) | |
| download | linux-dev-a812297c4fd9c2c9337b451ad8d66083c5b24ceb.tar.xz linux-dev-a812297c4fd9c2c9337b451ad8d66083c5b24ceb.zip | |
KVM: x86: hyperv: optimize 'all cpus' case in kvm_hv_flush_tlb()
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@redhat.com>
Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Reviewed-by: Roman Kagan <rkagan@virtuozzo.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'virt')
| -rw-r--r-- | virt/kvm/kvm_main.c | 6 |
1 files changed, 2 insertions, 4 deletions
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c index f986e31fa68c..587e1a0a8715 100644 --- a/virt/kvm/kvm_main.c +++ b/virt/kvm/kvm_main.c @@ -219,7 +219,7 @@ bool kvm_make_vcpus_request_mask(struct kvm *kvm, unsigned int req, me = get_cpu(); kvm_for_each_vcpu(i, vcpu, kvm) { - if (!test_bit(i, vcpu_bitmap)) + if (vcpu_bitmap && !test_bit(i, vcpu_bitmap)) continue; kvm_make_request(req, vcpu); @@ -243,12 +243,10 @@ bool kvm_make_all_cpus_request(struct kvm *kvm, unsigned int req) { cpumask_var_t cpus; bool called; - static unsigned long vcpu_bitmap[BITS_TO_LONGS(KVM_MAX_VCPUS)] - = {[0 ... BITS_TO_LONGS(KVM_MAX_VCPUS)-1] = ULONG_MAX}; zalloc_cpumask_var(&cpus, GFP_ATOMIC); - called = kvm_make_vcpus_request_mask(kvm, req, vcpu_bitmap, cpus); + called = kvm_make_vcpus_request_mask(kvm, req, NULL, cpus); free_cpumask_var(cpus); return called; |