From: Avi Kivity <avi@qumranet.com>
Date: Thu, 7 Jun 2007 16:11:53 +0000 (+0300)
Subject: KVM: Keep an upper bound of initialized vcpus
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=39c3b86e5c193e09f69f0e99c93600a4999ffc60;p=linux-beck.git

KVM: Keep an upper bound of initialized vcpus

That way, we don't need to loop for KVM_MAX_VCPUS for a single vcpu
vm.

Signed-off-by: Avi Kivity <avi@qumranet.com>
---

diff --git a/drivers/kvm/kvm.h b/drivers/kvm/kvm.h
index d49b16cae27a..528a56b1790e 100644
--- a/drivers/kvm/kvm.h
+++ b/drivers/kvm/kvm.h
@@ -379,6 +379,7 @@ struct kvm {
 	struct list_head active_mmu_pages;
 	int n_free_mmu_pages;
 	struct hlist_head mmu_page_hash[KVM_NUM_MMU_PAGES];
+	int nvcpus;
 	struct kvm_vcpu vcpus[KVM_MAX_VCPUS];
 	int memory_config_version;
 	int busy;
diff --git a/drivers/kvm/kvm_main.c b/drivers/kvm/kvm_main.c
index 556416962541..4e1a017f3db7 100644
--- a/drivers/kvm/kvm_main.c
+++ b/drivers/kvm/kvm_main.c
@@ -2391,6 +2391,11 @@ static int kvm_vm_ioctl_create_vcpu(struct kvm *kvm, int n)
 	if (r < 0)
 		goto out_free_vcpus;
 
+	spin_lock(&kvm_lock);
+	if (n >= kvm->nvcpus)
+		kvm->nvcpus = n + 1;
+	spin_unlock(&kvm_lock);
+
 	return r;
 
 out_free_vcpus: