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KVM: Split vcpu creation to avoid vcpu_load() before preemption setup

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Split kvm_arch_vcpu_create() into kvm_arch_vcpu_create() and
kvm_arch_vcpu_setup(), enabling preemption notification between the two.
This mean that we can now do vcpu_load() within kvm_arch_vcpu_setup().

Signed-off-by: Avi Kivity <avi@qumranet.com>
This commit is contained in:
Avi Kivity 2007-11-20 15:30:24 +02:00
parent 0de10343b3
commit 26e5215fdc
3 changed files with 12 additions and 9 deletions
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1
drivers/kvm/kvm.h
View File

@ -466,6 +466,7 @@ void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu);
void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu);
void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu);
struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, unsigned int id);
int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu);
void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu);
int kvm_arch_vcpu_reset(struct kvm_vcpu *vcpu);

4
drivers/kvm/kvm_main.c
View File

@ -769,6 +769,10 @@ static int kvm_vm_ioctl_create_vcpu(struct kvm *kvm, int n)
preempt_notifier_init(&vcpu->preempt_notifier, &kvm_preempt_ops);
r = kvm_arch_vcpu_setup(vcpu);
if (r)
goto vcpu_destroy;
mutex_lock(&kvm->lock);
if (kvm->vcpus[n]) {
r = -EEXIST;

16
drivers/kvm/x86.c
View File

@ -2478,13 +2478,12 @@ void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu)
struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm,
unsigned int id)
{
int r;
struct kvm_vcpu *vcpu = kvm_x86_ops->vcpu_create(kvm, id);
return kvm_x86_ops->vcpu_create(kvm, id);
}
if (IS_ERR(vcpu)) {
r = -ENOMEM;
goto fail;
}
int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu)
{
int r;
/* We do fxsave: this must be aligned. */
BUG_ON((unsigned long)&vcpu->host_fx_image & 0xF);
@ -2497,11 +2496,10 @@ struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm,
if (r < 0)
goto free_vcpu;
return vcpu;
return 0;
free_vcpu:
kvm_x86_ops->vcpu_free(vcpu);
fail:
return ERR_PTR(r);
return r;
}
void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)