[PATCH] KVM: Add a global list of all virtual machines

This will allow us to iterate over all vcpus and see which cpus they are
running on.

[akpm@osdl.org: use standard (ugly) initialisers]
Signed-off-by: Avi Kivity <avi@qumranet.com>
Cc: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

2 files changed, 11 insertions, 1 deletions

diff --git a/drivers/kvm/kvm.h b/drivers/kvm/kvm.h
index 4ccb343b9aff..c48cebf8511d 100644
--- a/drivers/kvm/kvm.h
+++ b/drivers/kvm/kvm.h
@@ -304,6 +304,7 @@ struct kvm {
         int memory_config_version;
         int busy;
         unsigned long rmap_overflow;
+        struct list_head vm_list;
 };
 
 struct kvm_stat {
diff --git a/drivers/kvm/kvm_main.c b/drivers/kvm/kvm_main.c
index 9b79d3451f6f..a6cd1c1fe29a 100644
--- a/drivers/kvm/kvm_main.c
+++ b/drivers/kvm/kvm_main.c
@@ -41,6 +41,9 @@
 MODULE_AUTHOR("Qumranet");
 MODULE_LICENSE("GPL");
 
+static DEFINE_SPINLOCK(kvm_lock);
+static LIST_HEAD(vm_list);
+
 struct kvm_arch_ops *kvm_arch_ops;
 struct kvm_stat kvm_stat;
 EXPORT_SYMBOL_GPL(kvm_stat);
@@ -230,9 +233,13 @@ static int kvm_dev_open(struct inode *inode, struct file *filp)
                 struct kvm_vcpu *vcpu = &kvm->vcpus[i];
 
                 mutex_init(&vcpu->mutex);
+                vcpu->cpu = -1;
                 vcpu->kvm = kvm;
                 vcpu->mmu.root_hpa = INVALID_PAGE;
                 INIT_LIST_HEAD(&vcpu->free_pages);
+                spin_lock(&kvm_lock);
+                list_add(&kvm->vm_list, &vm_list);
+                spin_unlock(&kvm_lock);
         }
         filp->private_data = kvm;
         return 0;
@@ -292,6 +299,9 @@ static int kvm_dev_release(struct inode *inode, struct file *filp)
 {
         struct kvm *kvm = filp->private_data;
 
+        spin_lock(&kvm_lock);
+        list_del(&kvm->vm_list);
+        spin_unlock(&kvm_lock);
         kvm_free_vcpus(kvm);
         kvm_free_physmem(kvm);
         kfree(kvm);
@@ -546,7 +556,6 @@ static int kvm_dev_ioctl_create_vcpu(struct kvm *kvm, int n)
                                            FX_IMAGE_ALIGN);
         vcpu->guest_fx_image = vcpu->host_fx_image + FX_IMAGE_SIZE;
 
-        vcpu->cpu = -1;  /* First load will set up TR */
         r = kvm_arch_ops->vcpu_create(vcpu);
         if (r < 0)
                 goto out_free_vcpus;