aboutsummaryrefslogtreecommitdiffstats
path: root/virt/kvm/kvm_main.c
diff options
context:
space:
mode:
authorRadim Krčmář <rkrcmar@redhat.com>2019-11-07 07:53:42 -0500
committerPaolo Bonzini <pbonzini@redhat.com>2019-11-15 11:44:21 +0100
commit8750e72a79dda2f665ce17b62049f4d62130d991 (patch)
tree26c55833adf466e5eab151874c8d2e6c2eb25886 /virt/kvm/kvm_main.c
parentKVM: nVMX: Add support for capturing highest observable L2 TSC (diff)
downloadlinux-dev-8750e72a79dda2f665ce17b62049f4d62130d991.tar.xz
linux-dev-8750e72a79dda2f665ce17b62049f4d62130d991.zip
KVM: remember position in kvm->vcpus array
Fetching an index for any vcpu in kvm->vcpus array by traversing the entire array everytime is costly. This patch remembers the position of each vcpu in kvm->vcpus array by storing it in vcpus_idx under kvm_vcpu structure. Signed-off-by: Radim Krčmář <rkrcmar@redhat.com> Signed-off-by: Nitesh Narayan Lal <nitesh@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'virt/kvm/kvm_main.c')
-rw-r--r--virt/kvm/kvm_main.c5
1 files changed, 3 insertions, 2 deletions
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index b8534c6b8cf6..a158a93323f7 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -2685,7 +2685,8 @@ static int kvm_vm_ioctl_create_vcpu(struct kvm *kvm, u32 id)
goto unlock_vcpu_destroy;
}
- BUG_ON(kvm->vcpus[atomic_read(&kvm->online_vcpus)]);
+ vcpu->vcpu_idx = atomic_read(&kvm->online_vcpus);
+ BUG_ON(kvm->vcpus[vcpu->vcpu_idx]);
/* Now it's all set up, let userspace reach it */
kvm_get_kvm(kvm);
@@ -2695,7 +2696,7 @@ static int kvm_vm_ioctl_create_vcpu(struct kvm *kvm, u32 id)
goto unlock_vcpu_destroy;
}
- kvm->vcpus[atomic_read(&kvm->online_vcpus)] = vcpu;
+ kvm->vcpus[vcpu->vcpu_idx] = vcpu;
/*
* Pairs with smp_rmb() in kvm_get_vcpu. Write kvm->vcpus