diff options
| author | Andrea Arcangeli <aarcange@redhat.com> | 2016-12-17 21:13:32 +0300 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2016-12-19 17:45:15 +0300 |
| commit | cc0d907c0907561f108b2f4d4da24e85f18d0ca5 (patch) | |
| tree | 0ee5c0523acc8576d99da25187410b02c4497485 /arch | |
| parent | 931f261b42f10c8c8c9ab53f5ceb47ce51af7cf5 (diff) | |
| download | linux-cc0d907c0907561f108b2f4d4da24e85f18d0ca5.tar.xz | |
kvm: take srcu lock around kvm_steal_time_set_preempted()
kvm_memslots() will be called by kvm_write_guest_offset_cached() so
take the srcu lock.
Signed-off-by: Andrea Arcangeli <aarcange@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/x86/kvm/x86.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index 8ce1139a08b5..445c51b6cf6d 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -2844,6 +2844,7 @@ static void kvm_steal_time_set_preempted(struct kvm_vcpu *vcpu) void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu) { + int idx; /* * Disable page faults because we're in atomic context here. * kvm_write_guest_offset_cached() would call might_fault() @@ -2853,7 +2854,13 @@ void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu) * paging. */ pagefault_disable(); + /* + * kvm_memslots() will be called by + * kvm_write_guest_offset_cached() so take the srcu lock. + */ + idx = srcu_read_lock(&vcpu->kvm->srcu); kvm_steal_time_set_preempted(vcpu); + srcu_read_unlock(&vcpu->kvm->srcu, idx); pagefault_enable(); kvm_x86_ops->vcpu_put(vcpu); kvm_put_guest_fpu(vcpu); |