KVM: s390: add proper locking for CMMA migration bitmap

Some parts of the cmma migration bitmap is already protected
with the kvm->lock (e.g. the migration start). On the other
hand the read of the cmma bits is not protected against a
concurrent free, neither is the emulation of the ESSA instruction.
Let's extend the locking to all related ioctls by using
the slots lock for
- kvm_s390_vm_start_migration
- kvm_s390_vm_stop_migration
- kvm_s390_set_cmma_bits
- kvm_s390_get_cmma_bits

In addition to that, we use synchronize_srcu before freeing
the migration structure as all users hold kvm->srcu for read.
(e.g. the ESSA handler).

Reported-by: David Hildenbrand <david@redhat.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Cc: stable@vger.kernel.org # 4.13+
Fixes: 190df4a212a7 (KVM: s390: CMMA tracking, ESSA emulation, migration mode)
Reviewed-by: Claudio Imbrenda <imbrenda@linux.vnet.ibm.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>

diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
index abcd24fdde3fc9142768452dea3eaf839ec56648..52880e980a336a80263cd83c70aeabaad6726ea1 100644 (file)
--- a/arch/s390/kvm/kvm-s390.c
+++ b/arch/s390/kvm/kvm-s390.c
@@ -766,7 +766,7 @@ static void kvm_s390_sync_request_broadcast(struct kvm *kvm, int req)
 
 /*
  * Must be called with kvm->srcu held to avoid races on memslots, and with
- * kvm->lock to avoid races with ourselves and kvm_s390_vm_stop_migration.
+ * kvm->slots_lock to avoid races with ourselves and kvm_s390_vm_stop_migration.
  */
 static int kvm_s390_vm_start_migration(struct kvm *kvm)
 {
@@ -822,7 +822,7 @@ static int kvm_s390_vm_start_migration(struct kvm *kvm)
 }
 
 /*
- * Must be called with kvm->lock to avoid races with ourselves and
+ * Must be called with kvm->slots_lock to avoid races with ourselves and
  * kvm_s390_vm_start_migration.
  */
 static int kvm_s390_vm_stop_migration(struct kvm *kvm)
@@ -837,6 +837,8 @@ static int kvm_s390_vm_stop_migration(struct kvm *kvm)
 
        if (kvm->arch.use_cmma) {
                kvm_s390_sync_request_broadcast(kvm, KVM_REQ_STOP_MIGRATION);
+               /* We have to wait for the essa emulation to finish */
+               synchronize_srcu(&kvm->srcu);
                vfree(mgs->pgste_bitmap);
        }
        kfree(mgs);
@@ -846,14 +848,12 @@ static int kvm_s390_vm_stop_migration(struct kvm *kvm)
 static int kvm_s390_vm_set_migration(struct kvm *kvm,
                                     struct kvm_device_attr *attr)
 {
-       int idx, res = -ENXIO;
+       int res = -ENXIO;
 
-       mutex_lock(&kvm->lock);
+       mutex_lock(&kvm->slots_lock);
        switch (attr->attr) {
        case KVM_S390_VM_MIGRATION_START:
-               idx = srcu_read_lock(&kvm->srcu);
                res = kvm_s390_vm_start_migration(kvm);
-               srcu_read_unlock(&kvm->srcu, idx);
                break;
        case KVM_S390_VM_MIGRATION_STOP:
                res = kvm_s390_vm_stop_migration(kvm);
@@ -861,7 +861,7 @@ static int kvm_s390_vm_set_migration(struct kvm *kvm,
        default:
                break;
        }
-       mutex_unlock(&kvm->lock);
+       mutex_unlock(&kvm->slots_lock);
 
        return res;
 }
@@ -1751,7 +1751,9 @@ long kvm_arch_vm_ioctl(struct file *filp,
                r = -EFAULT;
                if (copy_from_user(&args, argp, sizeof(args)))
                        break;
+               mutex_lock(&kvm->slots_lock);
                r = kvm_s390_get_cmma_bits(kvm, &args);
+               mutex_unlock(&kvm->slots_lock);
                if (!r) {
                        r = copy_to_user(argp, &args, sizeof(args));
                        if (r)
@@ -1765,7 +1767,9 @@ long kvm_arch_vm_ioctl(struct file *filp,
                r = -EFAULT;
                if (copy_from_user(&args, argp, sizeof(args)))
                        break;
+               mutex_lock(&kvm->slots_lock);
                r = kvm_s390_set_cmma_bits(kvm, &args);
+               mutex_unlock(&kvm->slots_lock);
                break;
        }
        default: