From 26e5215fdc6cf7b5a8b1269134095abbb7338b3c Mon Sep 17 00:00:00 2001 From: Avi Kivity Date: Tue, 20 Nov 2007 15:30:24 +0200 Subject: [PATCH] KVM: Split vcpu creation to avoid vcpu_load() before preemption setup 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 --- drivers/kvm/kvm.h | 1 + drivers/kvm/kvm_main.c | 4 ++++ drivers/kvm/x86.c | 16 +++++++--------- 3 files changed, 12 insertions(+), 9 deletions(-) diff --git a/drivers/kvm/kvm.h b/drivers/kvm/kvm.h index 49094a221f..b65f5dee4b 100644 --- a/drivers/kvm/kvm.h +++ b/drivers/kvm/kvm.h @@ -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); diff --git a/drivers/kvm/kvm_main.c b/drivers/kvm/kvm_main.c index 9dd6ad3c6c..7939b5c9a4 100644 --- a/drivers/kvm/kvm_main.c +++ b/drivers/kvm/kvm_main.c @@ -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; diff --git a/drivers/kvm/x86.c b/drivers/kvm/x86.c index 6abb2ed1a9..b482b6a8a8 100644 --- a/drivers/kvm/x86.c +++ b/drivers/kvm/x86.c @@ -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) -- 2.39.5