Merge remote-tracking branch 'mst/tags/for_upstream' into staging

virtio, vhost, pc: fixes

Most notably this fixes a regression with vhost introduced by the pull before
last.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

# gpg: Signature made Fri 18 Nov 2016 03:51:55 PM GMT
# gpg:                using RSA key 0x281F0DB8D28D5469
# gpg: Good signature from "Michael S. Tsirkin <mst@kernel.org>"
# gpg:                 aka "Michael S. Tsirkin <mst@redhat.com>"
# Primary key fingerprint: 0270 606B 6F3C DF3D 0B17  0970 C350 3912 AFBE 8E67
#      Subkey fingerprint: 5D09 FD08 71C8 F85B 94CA  8A0D 281F 0DB8 D28D 5469

* mst/tags/for_upstream:
  acpi: Use apic_id_limit when calculating legacy ACPI table size
  ipmi: fix qemu crash while migrating with ipmi
  ivshmem: Fix 64 bit memory bar configuration
  virtio: set ISR on dataplane notifications
  virtio: access ISR atomically
  virtio: introduce grab/release_ioeventfd to fix vhost
  virtio-crypto: fix virtio_queue_set_notification() race

Message-id: 1479484366-7977-1-git-send-email-mst@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>

1 files changed, 14 insertions, 0 deletions

diff --git a/include/hw/virtio/virtio-bus.h b/include/hw/virtio/virtio-bus.h
index fdf7fdab81..8a51e2c564 100644
--- a/include/hw/virtio/virtio-bus.h
+++ b/include/hw/virtio/virtio-bus.h
@@ -97,6 +97,16 @@ struct VirtioBusState {
      * Set if ioeventfd has been started.
      */
     bool ioeventfd_started;
+
+    /*
+     * Set if ioeventfd has been grabbed by vhost.  When ioeventfd
+     * is grabbed by vhost, we track its started/stopped state (which
+     * depends in turn on the virtio status register), but do not
+     * register a handler for the ioeventfd.  When ioeventfd is
+     * released, if ioeventfd_started is true we finally register
+     * the handler so that QEMU's device model can use ioeventfd.
+     */
+    int ioeventfd_grabbed;
 };
 
 void virtio_bus_device_plugged(VirtIODevice *vdev, Error **errp);
@@ -131,6 +141,10 @@ bool virtio_bus_ioeventfd_enabled(VirtioBusState *bus);
 int virtio_bus_start_ioeventfd(VirtioBusState *bus);
 /* Stop the ioeventfd. */
 void virtio_bus_stop_ioeventfd(VirtioBusState *bus);
+/* Tell the bus that vhost is grabbing the ioeventfd. */
+int virtio_bus_grab_ioeventfd(VirtioBusState *bus);
+/* bus that vhost is not using the ioeventfd anymore. */
+void virtio_bus_release_ioeventfd(VirtioBusState *bus);
 /* Switch from/to the generic ioeventfd handler */
 int virtio_bus_set_host_notifier(VirtioBusState *bus, int n, bool assign);