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authorJim Mattson <jmattson@google.com>2019-10-25 13:34:58 +0200
committerPaolo Bonzini <pbonzini@redhat.com>2019-10-31 12:13:16 +0100
commita97b0e773e492ae319a7e981e98962a1060215f9 (patch)
tree1832cc63a277b8af0ce0d7c254aaf7042f86bbb9 /virt/kvm/kvm_main.c
parentkvm: Allocate memslots and buses before calling kvm_arch_init_vm (diff)
downloadlinux-dev-a97b0e773e492ae319a7e981e98962a1060215f9.tar.xz
linux-dev-a97b0e773e492ae319a7e981e98962a1060215f9.zip
kvm: call kvm_arch_destroy_vm if vm creation fails
In kvm_create_vm(), if we've successfully called kvm_arch_init_vm(), but then fail later in the function, we need to call kvm_arch_destroy_vm() so that it can do any necessary cleanup (like freeing memory). Fixes: 44a95dae1d229a ("KVM: x86: Detect and Initialize AVIC support") Signed-off-by: John Sperbeck <jsperbeck@google.com> Signed-off-by: Jim Mattson <jmattson@google.com> Reviewed-by: Junaid Shahid <junaids@google.com> [Remove dependency on "kvm: Don't clear reference count on kvm_create_vm() error path" which was not committed. - Paolo] Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'virt/kvm/kvm_main.c')
-rw-r--r--virt/kvm/kvm_main.c12
1 files changed, 7 insertions, 5 deletions
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index ec14dae2f538..d6f0696d98ef 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -641,7 +641,6 @@ static struct kvm *kvm_create_vm(unsigned long type)
mutex_init(&kvm->lock);
mutex_init(&kvm->irq_lock);
mutex_init(&kvm->slots_lock);
- refcount_set(&kvm->users_count, 1);
INIT_LIST_HEAD(&kvm->devices);
BUILD_BUG_ON(KVM_MEM_SLOTS_NUM > SHRT_MAX);
@@ -650,7 +649,7 @@ static struct kvm *kvm_create_vm(unsigned long type)
struct kvm_memslots *slots = kvm_alloc_memslots();
if (!slots)
- goto out_err_no_disable;
+ goto out_err_no_arch_destroy_vm;
/* Generations must be different for each address space. */
slots->generation = i;
rcu_assign_pointer(kvm->memslots[i], slots);
@@ -660,12 +659,13 @@ static struct kvm *kvm_create_vm(unsigned long type)
rcu_assign_pointer(kvm->buses[i],
kzalloc(sizeof(struct kvm_io_bus), GFP_KERNEL_ACCOUNT));
if (!kvm->buses[i])
- goto out_err_no_disable;
+ goto out_err_no_arch_destroy_vm;
}
+ refcount_set(&kvm->users_count, 1);
r = kvm_arch_init_vm(kvm, type);
if (r)
- goto out_err_no_disable;
+ goto out_err_no_arch_destroy_vm;
r = hardware_enable_all();
if (r)
@@ -699,7 +699,9 @@ out_err_no_irq_srcu:
out_err_no_srcu:
hardware_disable_all();
out_err_no_disable:
- refcount_set(&kvm->users_count, 0);
+ kvm_arch_destroy_vm(kvm);
+ WARN_ON_ONCE(!refcount_dec_and_test(&kvm->users_count));
+out_err_no_arch_destroy_vm:
for (i = 0; i < KVM_NR_BUSES; i++)
kfree(kvm_get_bus(kvm, i));
for (i = 0; i < KVM_ADDRESS_SPACE_NUM; i++)