KVM: Block memslot updates across range_start() and range_end()

We would like to avoid taking mmu_lock for .invalidate_range_{start,end}()
notifications that are unrelated to KVM.  Because mmu_notifier_count
must be modified while holding mmu_lock for write, and must always
be paired across start->end to stay balanced, lock elision must
happen in both or none.  Therefore, in preparation for this change,
this patch prevents memslot updates across range_start() and range_end().

Note, technically flag-only memslot updates could be allowed in parallel,
but stalling a memslot update for a relatively short amount of time is
not a scalability issue, and this is all more than complex enough.

A long note on the locking: a previous version of the patch used an rwsem
to block the memslot update while the MMU notifier run, but this resulted
in the following deadlock involving the pseudo-lock tagged as
"mmu_notifier_invalidate_range_start".

   ======================================================
   WARNING: possible circular locking dependency detected
   5.12.0-rc3+ #6 Tainted: G           OE
   ------------------------------------------------------
   qemu-system-x86/3069 is trying to acquire lock:
   ffffffff9c775ca0 (mmu_notifier_invalidate_range_start){+.+.}-{0:0}, at: __mmu_notifier_invalidate_range_end+0x5/0x190

   but task is already holding lock:
   ffffaff7410a9160 (&kvm->mmu_notifier_slots_lock){.+.+}-{3:3}, at: kvm_mmu_notifier_invalidate_range_start+0x36d/0x4f0 [kvm]

   which lock already depends on the new lock.

This corresponds to the following MMU notifier logic:

    invalidate_range_start
      take pseudo lock
      down_read()           (*)
      release pseudo lock
    invalidate_range_end
      take pseudo lock      (**)
      up_read()
      release pseudo lock

At point (*) we take the mmu_notifiers_slots_lock inside the pseudo lock;
at point (**) we take the pseudo lock inside the mmu_notifiers_slots_lock.

This could cause a deadlock (ignoring for a second that the pseudo lock
is not a lock):

- invalidate_range_start waits on down_read(), because the rwsem is
held by install_new_memslots

- install_new_memslots waits on down_write(), because the rwsem is
held till (another) invalidate_range_end finishes

- invalidate_range_end sits waits on the pseudo lock, held by
invalidate_range_start.

Removing the fairness of the rwsem breaks the cycle (in lockdep terms,
it would change the *shared* rwsem readers into *shared recursive*
readers), so open-code the wait using a readers count and a
spinlock.  This also allows handling blockable and non-blockable
critical section in the same way.

Losing the rwsem fairness does theoretically allow MMU notifiers to
block install_new_memslots forever.  Note that mm/mmu_notifier.c's own
retry scheme in mmu_interval_read_begin also uses wait/wake_up
and is likewise not fair.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

diff --git a/Documentation/virt/kvm/locking.rst b/Documentation/virt/kvm/locking.rst
index 35eca37..8138201 100644 (file)
--- a/Documentation/virt/kvm/locking.rst
+++ b/Documentation/virt/kvm/locking.rst
@@ -21,6 +21,12 @@ The acquisition orders for mutexes are as follows:
   can be taken inside a kvm->srcu read-side critical section,
   while kvm->slots_lock cannot.
 
+- kvm->mn_active_invalidate_count ensures that pairs of
+  invalidate_range_start() and invalidate_range_end() callbacks
+  use the same memslots array.  kvm->slots_lock and kvm->slots_arch_lock
+  are taken on the waiting side in install_new_memslots, so MMU notifiers
+  must not take either kvm->slots_lock or kvm->slots_arch_lock.
+
 On x86:
 
 - vcpu->mutex is taken outside kvm->arch.hyperv.hv_lock

diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index de58a08..5b6a69c 100644 (file)
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -548,6 +548,11 @@ struct kvm {
        struct kvm_memslots __rcu *memslots[KVM_ADDRESS_SPACE_NUM];
        struct kvm_vcpu *vcpus[KVM_MAX_VCPUS];
 
+       /* Used to wait for completion of MMU notifiers.  */
+       spinlock_t mn_invalidate_lock;
+       unsigned long mn_active_invalidate_count;
+       struct rcuwait mn_memslots_update_rcuwait;
+
        /*
         * created_vcpus is protected by kvm->lock, and is incremented
         * at the beginning of KVM_CREATE_VCPU.  online_vcpus is only

diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 5cc7937..8f9024d 100644 (file)
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -604,11 +604,9 @@ static void kvm_mmu_notifier_change_pte(struct mmu_notifier *mn,
        trace_kvm_set_spte_hva(address);
 
        /*
-        * .change_pte() must be surrounded by .invalidate_range_{start,end}(),
-        * and so always runs with an elevated notifier count.  This obviates
-        * the need to bump the sequence count.
+        * .change_pte() must be surrounded by .invalidate_range_{start,end}().
         */
-       WARN_ON_ONCE(!kvm->mmu_notifier_count);
+       WARN_ON_ONCE(!READ_ONCE(kvm->mn_active_invalidate_count));
 
        kvm_handle_hva_range(mn, address, address + 1, pte, kvm_set_spte_gfn);
 }
@@ -658,6 +656,18 @@ static int kvm_mmu_notifier_invalidate_range_start(struct mmu_notifier *mn,
 
        trace_kvm_unmap_hva_range(range->start, range->end);
 
+       /*
+        * Prevent memslot modification between range_start() and range_end()
+        * so that conditionally locking provides the same result in both
+        * functions.  Without that guarantee, the mmu_notifier_count
+        * adjustments will be imbalanced.
+        *
+        * Pairs with the decrement in range_end().
+        */
+       spin_lock(&kvm->mn_invalidate_lock);
+       kvm->mn_active_invalidate_count++;
+       spin_unlock(&kvm->mn_invalidate_lock);
+
        __kvm_handle_hva_range(kvm, &hva_range);
 
        return 0;
@@ -694,9 +704,22 @@ static void kvm_mmu_notifier_invalidate_range_end(struct mmu_notifier *mn,
                .flush_on_ret   = false,
                .may_block      = mmu_notifier_range_blockable(range),
        };
+       bool wake;
 
        __kvm_handle_hva_range(kvm, &hva_range);
 
+       /* Pairs with the increment in range_start(). */
+       spin_lock(&kvm->mn_invalidate_lock);
+       wake = (--kvm->mn_active_invalidate_count == 0);
+       spin_unlock(&kvm->mn_invalidate_lock);
+
+       /*
+        * There can only be one waiter, since the wait happens under
+        * slots_lock.
+        */
+       if (wake)
+               rcuwait_wake_up(&kvm->mn_memslots_update_rcuwait);
+
        BUG_ON(kvm->mmu_notifier_count < 0);
 }
 
@@ -977,6 +1000,9 @@ static struct kvm *kvm_create_vm(unsigned long type)
        mutex_init(&kvm->irq_lock);
        mutex_init(&kvm->slots_lock);
        mutex_init(&kvm->slots_arch_lock);
+       spin_lock_init(&kvm->mn_invalidate_lock);
+       rcuwait_init(&kvm->mn_memslots_update_rcuwait);
+
        INIT_LIST_HEAD(&kvm->devices);
 
        BUILD_BUG_ON(KVM_MEM_SLOTS_NUM > SHRT_MAX);
@@ -1099,6 +1125,16 @@ static void kvm_destroy_vm(struct kvm *kvm)
        kvm_coalesced_mmio_free(kvm);
 #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
        mmu_notifier_unregister(&kvm->mmu_notifier, kvm->mm);
+       /*
+        * At this point, pending calls to invalidate_range_start()
+        * have completed but no more MMU notifiers will run, so
+        * mn_active_invalidate_count may remain unbalanced.
+        * No threads can be waiting in install_new_memslots as the
+        * last reference on KVM has been dropped, but freeing
+        * memslots would deadlock without this manual intervention.
+        */
+       WARN_ON(rcuwait_active(&kvm->mn_memslots_update_rcuwait));
+       kvm->mn_active_invalidate_count = 0;
 #else
        kvm_arch_flush_shadow_all(kvm);
 #endif
@@ -1360,7 +1396,21 @@ static struct kvm_memslots *install_new_memslots(struct kvm *kvm,
        WARN_ON(gen & KVM_MEMSLOT_GEN_UPDATE_IN_PROGRESS);
        slots->generation = gen | KVM_MEMSLOT_GEN_UPDATE_IN_PROGRESS;
 
+       /*
+        * Do not store the new memslots while there are invalidations in
+        * progress (preparatory change for the next commit).
+        */
+       spin_lock(&kvm->mn_invalidate_lock);
+       prepare_to_rcuwait(&kvm->mn_memslots_update_rcuwait);
+       while (kvm->mn_active_invalidate_count) {
+               set_current_state(TASK_UNINTERRUPTIBLE);
+               spin_unlock(&kvm->mn_invalidate_lock);
+               schedule();
+               spin_lock(&kvm->mn_invalidate_lock);
+       }
+       finish_rcuwait(&kvm->mn_memslots_update_rcuwait);
        rcu_assign_pointer(kvm->memslots[as_id], slots);
+       spin_unlock(&kvm->mn_invalidate_lock);
 
        /*
         * Acquired in kvm_set_memslot. Must be released before synchronize