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kvm: destroy emulated devices on VM exit 

The hassle of getting refcounting right was greater than the hassle
of keeping a list of devices to destroy on VM exit.

Signed-off-by: Scott Wood <scottwood@freescale.com>
Signed-off-by: Alexander Graf <agraf@suse.de>
This commit is contained in:
Scott Wood 2013-04-25 14:11:23 +00:00 committed by Alexander Graf
parent 22e64024fb
commit 07f0a7bdec
3 changed files with 18 additions and 16 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
arch/powerpc/kvm/mpic.c
View File

@ -1781,7 +1781,6 @@ int kvmppc_mpic_connect_vcpu(struct kvm_device *dev, struct kvm_vcpu *vcpu,
if (opp->mpic_mode_mask == GCR_MODE_PROXY)
vcpu->arch.epr_flags |= KVMPPC_EPR_KERNEL;
kvm_device_get(dev);
out:
spin_unlock_irq(&opp->lock);
return ret;
@ -1797,7 +1796,6 @@ void kvmppc_mpic_disconnect_vcpu(struct openpic *opp, struct kvm_vcpu *vcpu)
BUG_ON(!opp->dst[vcpu->arch.irq_cpu_id].vcpu);
opp->dst[vcpu->arch.irq_cpu_id].vcpu = NULL;
kvm_device_put(opp->dev);
}
/*

3
include/linux/kvm_host.h
View File

@ -393,6 +393,7 @@ struct kvm {
long mmu_notifier_count;
#endif
long tlbs_dirty;
struct list_head devices;
};
#define kvm_err(fmt, ...) \
@ -1069,8 +1070,8 @@ struct kvm_device_ops;
struct kvm_device {
struct kvm_device_ops *ops;
struct kvm *kvm;
atomic_t users;
void *private;
struct list_head vm_node;
};
/* create, destroy, and name are mandatory */

29
virt/kvm/kvm_main.c
View File

@ -504,6 +504,7 @@ static struct kvm *kvm_create_vm(unsigned long type)
mutex_init(&kvm->irq_lock);
mutex_init(&kvm->slots_lock);
atomic_set(&kvm->users_count, 1);
INIT_LIST_HEAD(&kvm->devices);
r = kvm_init_mmu_notifier(kvm);
if (r)
@ -581,6 +582,19 @@ void kvm_free_physmem(struct kvm *kvm)
kfree(kvm->memslots);
}
static void kvm_destroy_devices(struct kvm *kvm)
{
struct list_head *node, *tmp;
list_for_each_safe(node, tmp, &kvm->devices) {
struct kvm_device *dev =
list_entry(node, struct kvm_device, vm_node);
list_del(node);
dev->ops->destroy(dev);
}
}
static void kvm_destroy_vm(struct kvm *kvm)
{
int i;
@ -600,6 +614,7 @@ static void kvm_destroy_vm(struct kvm *kvm)
kvm_arch_flush_shadow_all(kvm);
#endif
kvm_arch_destroy_vm(kvm);
kvm_destroy_devices(kvm);
kvm_free_physmem(kvm);
cleanup_srcu_struct(&kvm->srcu);
kvm_arch_free_vm(kvm);
@ -2195,23 +2210,11 @@ static long kvm_device_ioctl(struct file *filp, unsigned int ioctl,
}
}
void kvm_device_get(struct kvm_device *dev)
{
atomic_inc(&dev->users);
}
void kvm_device_put(struct kvm_device *dev)
{
if (atomic_dec_and_test(&dev->users))
dev->ops->destroy(dev);
}
static int kvm_device_release(struct inode *inode, struct file *filp)
{
struct kvm_device *dev = filp->private_data;
struct kvm *kvm = dev->kvm;
kvm_device_put(dev);
kvm_put_kvm(kvm);
return 0;
}
@ -2257,7 +2260,6 @@ static int kvm_ioctl_create_device(struct kvm *kvm,
dev->ops = ops;
dev->kvm = kvm;
atomic_set(&dev->users, 1);
ret = ops->create(dev, cd->type);
if (ret < 0) {
@ -2271,6 +2273,7 @@ static int kvm_ioctl_create_device(struct kvm *kvm,
return ret;
}
list_add(&dev->vm_node, &kvm->devices);
kvm_get_kvm(kvm);
cd->fd = ret;
return 0;