From mboxrd@z Thu Jan 1 00:00:00 1970 From: Liu Ping Fan Subject: [PATCH 3/5] hotplug: introduce qdev_unplug_ack() to remove device from views Date: Wed, 25 Jul 2012 11:31:08 +0800 Message-ID: <1343187070-27371-4-git-send-email-qemulist@gmail.com> References: <1343187070-27371-1-git-send-email-qemulist@gmail.com> Cc: kvm@vger.kernel.org, Stefan Hajnoczi , Marcelo Tosatti , Avi Kivity , Anthony Liguori , Jan Kiszka To: qemu-devel@nongnu.org Return-path: In-Reply-To: <1343187070-27371-1-git-send-email-qemulist@gmail.com> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+gceq-qemu-devel=gmane.org@nongnu.org Sender: qemu-devel-bounces+gceq-qemu-devel=gmane.org@nongnu.org List-Id: kvm.vger.kernel.org From: Liu Ping Fan When guest confirm the removal of device, we should --unmap from MemoryRegion view --isolated from device tree view Signed-off-by: Liu Ping Fan --- hw/acpi_piix4.c | 4 ++-- hw/qdev.c | 28 ++++++++++++++++++++++++++++ hw/qdev.h | 3 ++- 3 files changed, 32 insertions(+), 3 deletions(-) diff --git a/hw/acpi_piix4.c b/hw/acpi_piix4.c index 0aace60..c174247 100644 --- a/hw/acpi_piix4.c +++ b/hw/acpi_piix4.c @@ -305,8 +305,8 @@ static void acpi_piix_eject_slot(PIIX4PMState *s, unsigned slots) if (pc->no_hotplug) { slot_free = false; } else { - object_unparent(OBJECT(dev)); - qdev_free(qdev); + /* refcnt will be decreased */ + qdev_unplug_ack(qdev, NULL); } } } diff --git a/hw/qdev.c b/hw/qdev.c index ac55e45..3f7dfa5 100644 --- a/hw/qdev.c +++ b/hw/qdev.c @@ -104,6 +104,14 @@ void qdev_set_parent_bus(DeviceState *dev, BusState *bus) bus_add_child(bus, dev); } +static void qdev_unset_parent(DeviceState *dev) +{ + BusState *b = dev->parent_bus; + + object_unparent(OBJECT(dev)); + bus_remove_child(b, dev); +} + /* Create a new device. This only initializes the device state structure and allows properties to be set. qdev_init should be called to initialize the actual device emulation. */ @@ -194,6 +202,26 @@ void qdev_set_legacy_instance_id(DeviceState *dev, int alias_id, dev->alias_required_for_version = required_for_version; } +static int qdev_unmap(DeviceState *dev) +{ + DeviceClass *dc = DEVICE_GET_CLASS(dev); + if (dc->unmap) { + dc->unmap(dev); + } + return 0; +} + +void qdev_unplug_ack(DeviceState *dev, Error **errp) +{ + qemu_rwlock_wrlock_devtree(); + /* isolate from device tree */ + qdev_unset_parent(dev); + /* isolate from mem view */ + qdev_unmap(dev); + qemu_rwlock_unlock_devtree(); + object_unref(OBJECT(dev)); +} + void qdev_unplug(DeviceState *dev, Error **errp) { DeviceClass *dc = DEVICE_GET_CLASS(dev); diff --git a/hw/qdev.h b/hw/qdev.h index f4683dc..fc5ff02 100644 --- a/hw/qdev.h +++ b/hw/qdev.h @@ -47,7 +47,7 @@ typedef struct DeviceClass { /* callbacks */ void (*reset)(DeviceState *dev); - + void (*unmap)(DeviceState *dev); /* device state */ const VMStateDescription *vmsd; @@ -162,6 +162,7 @@ void qdev_init_nofail(DeviceState *dev); void qdev_set_legacy_instance_id(DeviceState *dev, int alias_id, int required_for_version); void qdev_unplug(DeviceState *dev, Error **errp); +void qdev_unplug_ack(DeviceState *dev, Error **errp); void qdev_free(DeviceState *dev); int qdev_simple_unplug_cb(DeviceState *dev); void qdev_machine_creation_done(void); -- 1.7.4.4