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authorVitaly Kuznetsov <vkuznets@redhat.com>2018-08-22 12:18:29 +0200
committerPaolo Bonzini <pbonzini@redhat.com>2018-10-17 00:29:44 +0200
commita812297c4fd9c2c9337b451ad8d66083c5b24ceb (patch)
tree7d4da181f54955a033880395489b0d0fee13ccb7 /virt
parent9170200ec0ebad70e5b9902bc93e2b1b11456a3b (diff)
downloadlinux-aarch64-a812297c4fd9c2c9337b451ad8d66083c5b24ceb.tar.gz
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.c6
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;