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71e076a07d
..and use for both virtio-user-blk and virtio-user-gpio. This avoids the circular close by deferring shutdown due to disconnection until a later point. virtio-user-blk already had this mechanism in place so generalise it as a vhost-user helper function and use for both blk and gpio devices. While we are at it we also fix up vhost-user-gpio to re-establish the event handler after close down so we can reconnect later. Signed-off-by: Alex Bennée <alex.bennee@linaro.org> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Reviewed-by: Raphael Norwitz <raphael.norwitz@nutanix.com> Message-Id: <20221130112439.2527228-5-alex.bennee@linaro.org> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
90 lines
2.7 KiB
C
90 lines
2.7 KiB
C
/*
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* Copyright (c) 2017-2018 Intel Corporation
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*
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* This work is licensed under the terms of the GNU GPL, version 2.
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* See the COPYING file in the top-level directory.
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*/
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#ifndef HW_VIRTIO_VHOST_USER_H
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#define HW_VIRTIO_VHOST_USER_H
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#include "chardev/char-fe.h"
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#include "hw/virtio/virtio.h"
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/**
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* VhostUserHostNotifier - notifier information for one queue
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* @rcu: rcu_head for cleanup
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* @mr: memory region of notifier
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* @addr: current mapped address
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* @unmap_addr: address to be un-mapped
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* @idx: virtioqueue index
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*
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* The VhostUserHostNotifier entries are re-used. When an old mapping
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* is to be released it is moved to @unmap_addr and @addr is replaced.
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* Once the RCU process has completed the unmap @unmap_addr is
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* cleared.
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*/
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typedef struct VhostUserHostNotifier {
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struct rcu_head rcu;
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MemoryRegion mr;
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void *addr;
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void *unmap_addr;
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int idx;
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} VhostUserHostNotifier;
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/**
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* VhostUserState - shared state for all vhost-user devices
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* @chr: the character backend for the socket
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* @notifiers: GPtrArray of @VhostUserHostnotifier
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* @memory_slots:
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*/
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typedef struct VhostUserState {
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CharBackend *chr;
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GPtrArray *notifiers;
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int memory_slots;
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bool supports_config;
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} VhostUserState;
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/**
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* vhost_user_init() - initialise shared vhost_user state
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* @user: allocated area for storing shared state
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* @chr: the chardev for the vhost socket
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* @errp: error handle
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*
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* User can either directly g_new() space for the state or embed
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* VhostUserState in their larger device structure and just point to
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* it.
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*
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* Return: true on success, false on error while setting errp.
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*/
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bool vhost_user_init(VhostUserState *user, CharBackend *chr, Error **errp);
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/**
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* vhost_user_cleanup() - cleanup state
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* @user: ptr to use state
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*
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* Cleans up shared state and notifiers, callee is responsible for
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* freeing the @VhostUserState memory itself.
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*/
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void vhost_user_cleanup(VhostUserState *user);
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/**
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* vhost_user_async_close() - cleanup vhost-user post connection drop
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* @d: DeviceState for the associated device (passed to callback)
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* @chardev: the CharBackend associated with the connection
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* @vhost: the common vhost device
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* @cb: the user callback function to complete the clean-up
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*
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* This function is used to handle the shutdown of a vhost-user
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* connection to a backend. We handle this centrally to make sure we
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* do all the steps and handle potential races due to VM shutdowns.
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* Once the connection is disabled we call a backhalf to ensure
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*/
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typedef void (*vu_async_close_fn)(DeviceState *cb);
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void vhost_user_async_close(DeviceState *d,
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CharBackend *chardev, struct vhost_dev *vhost,
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vu_async_close_fn cb);
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#endif
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