Gleb Natapov wrote:
Archs are free to use vcpu_id as they see fit. For x86 it is used as
vcpu's apic id.
You need a KVM_CAP to inform userspace that the vcpu id has changed meaning.
inline int kvm_is_mmio_pfn(pfn_t pfn)
{
if (pfn_valid(pfn)) {
@@ -1713,15 +1708,12 @@ static int create_vcpu_fd(struct kvm_vcpu *vcpu)
/*
* Creates some virtual cpus. Good luck creating more than one.
*/
-static int kvm_vm_ioctl_create_vcpu(struct kvm *kvm, int n)
+static int kvm_vm_ioctl_create_vcpu(struct kvm *kvm, u32 id)
{
int r;
struct kvm_vcpu *vcpu;
- if (!valid_vcpu(n))
- return -EINVAL;
-
- vcpu = kvm_arch_vcpu_create(kvm, n);
+ vcpu = kvm_arch_vcpu_create(kvm, id);
if (IS_ERR(vcpu))
return PTR_ERR(vcpu);
@@ -1732,25 +1724,36 @@ static int kvm_vm_ioctl_create_vcpu(struct kvm *kvm, int n)
return r;
mutex_lock(&kvm->lock);
- if (kvm->vcpus[n]) {
- r = -EEXIST;
+ if (atomic_read(&kvm->online_vcpus) == KVM_MAX_VCPUS) {
+ r = -EINVAL;
goto vcpu_destroy;
}
- kvm->vcpus[n] = vcpu;
- if (n == 0)
- kvm->bsp_vcpu = vcpu;
- mutex_unlock(&kvm->lock);
+
+ for (r = 0; r < atomic_read(&kvm->online_vcpus); r++)
+ if (kvm->vcpus[r]->vcpu_id == id) {
+ r = -EEXIST;
+ goto vcpu_destroy;
+ }
+
+ BUG_ON(kvm->vcpus[atomic_read(&kvm->online_vcpus)]);
/* Now it's all set up, let userspace reach it */
kvm_get_kvm(kvm);
r = create_vcpu_fd(vcpu);
- if (r < 0)
- goto unlink;
+ if (r < 0) {
+ kvm_put_kvm(kvm);
+ goto vcpu_destroy;
+ }
+
+ kvm->vcpus[atomic_read(&kvm->online_vcpus)] = vcpu;
+ smp_wmb();
+ atomic_inc(&kvm->online_vcpus);
+
+ if (id == 0)
+ kvm->bsp_vcpu = vcpu;
+ mutex_unlock(&kvm->lock);
return r;
-unlink:
- mutex_lock(&kvm->lock);
- kvm->vcpus[n] = NULL;
vcpu_destroy:
mutex_unlock(&kvm->lock);
kvm_arch_vcpu_destroy(vcpu);
Don't the vcpu ioctls need to be updated? They get the vcpu id as a
parameter.
--
error compiling committee.c: too many arguments to function
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