diff options
| author | Paolo Bonzini | 2016-12-12 10:12:53 +0100 |
|---|---|---|
| committer | Paolo Bonzini | 2016-12-16 17:53:38 +0100 |
| commit | 3f5ad8be3713572f3946b69eb376206153d0ea2d (patch) | |
| tree | 90ca8a72bf9fd7fc79652a8c772f00ae32574606 /Documentation | |
| parent | 83781d180b219bd079ae72b341ee3f21fb236e97 (diff) | |
KVM: hyperv: fix locking of struct kvm_hv fields
Introduce a new mutex to avoid an AB-BA deadlock between kvm->lock and
vcpu->mutex. Protect accesses in kvm_hv_setup_tsc_page too, as suggested
by Roman.
Reported-by: Dmitry Vyukov <dvyukov@google.com>
Reviewed-by: Roman Kagan <rkagan@virtuozzo.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/virtual/kvm/locking.txt | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/Documentation/virtual/kvm/locking.txt b/Documentation/virtual/kvm/locking.txt index e5dd9f4d6100..fd013bf4115b 100644 --- a/Documentation/virtual/kvm/locking.txt +++ b/Documentation/virtual/kvm/locking.txt @@ -13,8 +13,12 @@ The acquisition orders for mutexes are as follows: - kvm->slots_lock is taken outside kvm->irq_lock, though acquiring them together is quite rare. -For spinlocks, kvm_lock is taken outside kvm->mmu_lock. Everything -else is a leaf: no other lock is taken inside the critical sections. +On x86, vcpu->mutex is taken outside kvm->arch.hyperv.hv_lock. + +For spinlocks, kvm_lock is taken outside kvm->mmu_lock. + +Everything else is a leaf: no other lock is taken inside the critical +sections. 2: Exception ------------ |