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KVM: Use kmem cache for allocating vcpus

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Avi wants the allocations of vcpus centralized again.  The easiest way
is to add a "size" arg to kvm_init_arch, and expose the thus-prepared
cache to the modules.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Avi Kivity <avi@qumranet.com>
This commit is contained in:
Rusty Russell
2007-07-30 21:12:19 +10:00
committed by Avi Kivity
parent e7d5d76cae
commit c16f862d02
4 changed files with 23 additions and 6 deletions
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16
drivers/kvm/kvm_main.c
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@@ -53,6 +53,8 @@ static LIST_HEAD(vm_list);
static cpumask_t cpus_hardware_enabled;
struct kvm_arch_ops *kvm_arch_ops;
struct kmem_cache *kvm_vcpu_cache;
EXPORT_SYMBOL_GPL(kvm_vcpu_cache);
static __read_mostly struct preempt_ops kvm_preempt_ops;
@@ -3104,7 +3106,8 @@ static void kvm_sched_out(struct preempt_notifier *pn,
kvm_arch_ops->vcpu_put(vcpu);
}
int kvm_init_arch(struct kvm_arch_ops *ops, struct module *module)
int kvm_init_arch(struct kvm_arch_ops *ops, unsigned int vcpu_size,
struct module *module)
{
int r;
@@ -3142,6 +3145,14 @@ int kvm_init_arch(struct kvm_arch_ops *ops, struct module *module)
if (r)
goto out_free_3;
/* A kmem cache lets us meet the alignment requirements of fx_save. */
kvm_vcpu_cache = kmem_cache_create("kvm_vcpu", vcpu_size,
__alignof__(struct kvm_vcpu), 0, 0);
if (!kvm_vcpu_cache) {
r = -ENOMEM;
goto out_free_4;
}
kvm_chardev_ops.owner = module;
r = misc_register(&kvm_dev);
@@ -3156,6 +3167,8 @@ int kvm_init_arch(struct kvm_arch_ops *ops, struct module *module)
return r;
out_free:
kmem_cache_destroy(kvm_vcpu_cache);
out_free_4:
sysdev_unregister(&kvm_sysdev);
out_free_3:
sysdev_class_unregister(&kvm_sysdev_class);
@@ -3173,6 +3186,7 @@ out:
void kvm_exit_arch(void)
{
misc_deregister(&kvm_dev);
kmem_cache_destroy(kvm_vcpu_cache);
sysdev_unregister(&kvm_sysdev);
sysdev_class_unregister(&kvm_sysdev_class);
unregister_reboot_notifier(&kvm_reboot_notifier);