[PATCH 3.10 007/143] KVM: fix spin_lock_init order on x86

[Willy Tarreau]

From: Paolo Bonzini <pbonz...@redhat.com>

commit e9ad4ec8379ad1ba6f68b8ca1c26b50b5ae0a327 upstream.

Moving the initialization earlier is needed in 4.6 because
kvm_arch_init_vm is now using mmu_lock, causing lockdep to
complain:

[  284.440294] INFO: trying to register non-static key.
[  284.445259] the code is fine but needs lockdep annotation.
[  284.450736] turning off the locking correctness validator.
...
[  284.528318]  [<ffffffff810aecc3>] lock_acquire+0xd3/0x240
[  284.533733]  [<ffffffffa0305aa0>] ? 
kvm_page_track_register_notifier+0x20/0x60 [kvm]
[  284.541467]  [<ffffffff81715581>] _raw_spin_lock+0x41/0x80
[  284.546960]  [<ffffffffa0305aa0>] ? 
kvm_page_track_register_notifier+0x20/0x60 [kvm]
[  284.554707]  [<ffffffffa0305aa0>] kvm_page_track_register_notifier+0x20/0x60 
[kvm]
[  284.562281]  [<ffffffffa02ece70>] kvm_mmu_init_vm+0x20/0x30 [kvm]
[  284.568381]  [<ffffffffa02dbf7a>] kvm_arch_init_vm+0x1ea/0x200 [kvm]
[  284.574740]  [<ffffffffa02bff3f>] kvm_dev_ioctl+0xbf/0x4d0 [kvm]

However, it also helps fixing a preexisting problem, which is why this
patch is also good for stable kernels: kvm_create_vm was incrementing
current->mm->mm_count but not decrementing it at the out_err label (in
case kvm_init_mmu_notifier failed).  The new initialization order makes
it possible to add the required mmdrop without adding a new error label.

Reported-by: Borislav Petkov <b...@alien8.de>
Signed-off-by: Paolo Bonzini <pbonz...@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
Signed-off-by: Willy Tarreau <w...@1wt.eu>
---
 virt/kvm/kvm_main.c | 21 +++++++++++----------
 1 file changed, 11 insertions(+), 10 deletions(-)

diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 1d4b8be..4f865e1 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -468,6 +468,16 @@ static struct kvm *kvm_create_vm(unsigned long type)
        if (!kvm)
                return ERR_PTR(-ENOMEM);
 
+       spin_lock_init(&kvm->mmu_lock);
+       atomic_inc(&current->mm->mm_count);
+       kvm->mm = current->mm;
+       kvm_eventfd_init(kvm);
+       mutex_init(&kvm->lock);
+       mutex_init(&kvm->irq_lock);
+       mutex_init(&kvm->slots_lock);
+       atomic_set(&kvm->users_count, 1);
+       INIT_LIST_HEAD(&kvm->devices);
+
        r = kvm_arch_init_vm(kvm, type);
        if (r)
                goto out_err_nodisable;
@@ -497,16 +507,6 @@ static struct kvm *kvm_create_vm(unsigned long type)
                        goto out_err;
        }
 
-       spin_lock_init(&kvm->mmu_lock);
-       kvm->mm = current->mm;
-       atomic_inc(&kvm->mm->mm_count);
-       kvm_eventfd_init(kvm);
-       mutex_init(&kvm->lock);
-       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)
                goto out_err;
@@ -526,6 +526,7 @@ out_err_nodisable:
                kfree(kvm->buses[i]);
        kfree(kvm->memslots);
        kvm_arch_free_vm(kvm);
+       mmdrop(current->mm);
        return ERR_PTR(r);
 }
 
-- 
2.8.0.rc2.1.gbe9624a