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| author |   Davidlohr Bueso <dave@stgolabs.net> | 2017-09-13 13:08:21 -0700 |
|---|---|---|
| committer |   Paolo Bonzini <pbonzini@redhat.com> | 2017-09-15 16:57:12 +0200 |
| commit | a0cff57bb2a41cb9cbf13d3203097b4156d8c0ae (patch) | |
| tree | db128f5fac2c228a01f314174b20db01b3412316 /virt/kvm/kvm_main.c | |
| parent | kvm,lapic: Justify use of swait_active() (diff) | |
| download | linux-dev-a0cff57bb2a41cb9cbf13d3203097b4156d8c0ae.tar.xz linux-dev-a0cff57bb2a41cb9cbf13d3203097b4156d8c0ae.zip | |
kvm,x86: Fix apf_task_wake_one() wq serialization
During code inspection, the following potential race was seen:
CPU0 CPU1
kvm_async_pf_task_wait apf_task_wake_one
[L] swait_active(&n->wq)
[S] prepare_to_swait(&n.wq)
[L] if (!hlist_unhahed(&n.link))
schedule() [S] hlist_del_init(&n->link);
Properly serialize swait_active() checks such that a wakeup is
not missed.
Signed-off-by: Davidlohr Bueso <dbueso@suse.de>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'virt/kvm/kvm_main.c')
0 files changed, 0 insertions, 0 deletions