diff options
| author | Jagannathan Raman <jag.raman@oracle.com> | 2022-06-13 16:26:21 -0400 |
|---|---|---|
| committer | Stefan Hajnoczi <stefanha@redhat.com> | 2022-06-15 14:50:41 +0100 |
| commit | 217c7f01adaf2853951d4725e3527ae70c45fbfc (patch) | |
| tree | 6d98aab623149d74f19b1549cdb56d83e759b436 /include | |
| parent | e2848bc574fe2715c694bf8fe9a1ba7f78a1125a (diff) | |
qdev: unplug blocker for devices
Add blocker to prevent hot-unplug of devices
TYPE_VFIO_USER_SERVER, which is introduced shortly, attaches itself to a
PCIDevice on which it depends. If the attached PCIDevice gets removed
while the server in use, it could cause it crash. To prevent this,
TYPE_VFIO_USER_SERVER adds an unplug blocker for the PCIDevice.
Signed-off-by: Elena Ufimtseva <elena.ufimtseva@oracle.com>
Signed-off-by: John G Johnson <john.g.johnson@oracle.com>
Signed-off-by: Jagannathan Raman <jag.raman@oracle.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-id: c41ef80b7cc063314d629737bed2159e5713f2e0.1655151679.git.jag.raman@oracle.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Diffstat (limited to 'include')
| -rw-r--r-- | include/hw/qdev-core.h | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/include/hw/qdev-core.h b/include/hw/qdev-core.h index 92c3d65208..98774e2835 100644 --- a/include/hw/qdev-core.h +++ b/include/hw/qdev-core.h @@ -193,6 +193,7 @@ struct DeviceState { int instance_id_alias; int alias_required_for_version; ResettableState reset; + GSList *unplug_blockers; }; struct DeviceListener { @@ -420,6 +421,34 @@ void qdev_machine_creation_done(void); bool qdev_machine_modified(void); /** + * qdev_add_unplug_blocker: Add an unplug blocker to a device + * + * @dev: Device to be blocked from unplug + * @reason: Reason for blocking + */ +void qdev_add_unplug_blocker(DeviceState *dev, Error *reason); + +/** + * qdev_del_unplug_blocker: Remove an unplug blocker from a device + * + * @dev: Device to be unblocked + * @reason: Pointer to the Error used with qdev_add_unplug_blocker. + * Used as a handle to lookup the blocker for deletion. + */ +void qdev_del_unplug_blocker(DeviceState *dev, Error *reason); + +/** + * qdev_unplug_blocked: Confirm if a device is blocked from unplug + * + * @dev: Device to be tested + * @reason: Returns one of the reasons why the device is blocked, + * if any + * + * Returns: true if device is blocked from unplug, false otherwise + */ +bool qdev_unplug_blocked(DeviceState *dev, Error **errp); + +/** * GpioPolarity: Polarity of a GPIO line * * GPIO lines use either positive (active-high) logic, |