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c4583c8c39
Currently a single watch on /local/domain/X/backend is registered by each QEMU process running in service domain X (where X is usually 0). The purpose of this watch is to ensure that QEMU is notified when the Xen toolstack creates a new device backend area. Such a backend area is specific to a single frontend area created for a specific guest domain and, since each QEMU process is also created to service a specfic guest domain, it is unnecessary and inefficient to notify all QEMU processes. Only the QEMU process associated with the same guest domain need receive the notification. This patch re-factors the watch registration code such that notifications are targetted appropriately. Reported-by: Jerome Leseinne <jerome.leseinne@gmail.com> Signed-off-by: Paul Durrant <pdurrant@amazon.com> Reviewed-by: Anthony PERARD <anthony.perard@citrix.com> Message-Id: <20201001081500.1026-1-paul@xen.org> Signed-off-by: Anthony PERARD <anthony.perard@citrix.com>
140 lines
4.6 KiB
C
140 lines
4.6 KiB
C
/*
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* Copyright (c) 2018 Citrix Systems Inc.
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or later.
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* See the COPYING file in the top-level directory.
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*/
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#ifndef HW_XEN_BUS_H
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#define HW_XEN_BUS_H
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#include "hw/xen/xen_common.h"
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#include "hw/sysbus.h"
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#include "qemu/notify.h"
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#include "qom/object.h"
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typedef void (*XenWatchHandler)(void *opaque);
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typedef struct XenWatchList XenWatchList;
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typedef struct XenWatch XenWatch;
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typedef struct XenEventChannel XenEventChannel;
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struct XenDevice {
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DeviceState qdev;
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domid_t frontend_id;
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char *name;
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struct xs_handle *xsh;
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XenWatchList *watch_list;
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char *backend_path, *frontend_path;
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enum xenbus_state backend_state, frontend_state;
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Notifier exit;
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XenWatch *backend_state_watch, *frontend_state_watch;
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bool backend_online;
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XenWatch *backend_online_watch;
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xengnttab_handle *xgth;
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bool feature_grant_copy;
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bool inactive;
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QLIST_HEAD(, XenEventChannel) event_channels;
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QLIST_ENTRY(XenDevice) list;
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};
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typedef struct XenDevice XenDevice;
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typedef char *(*XenDeviceGetName)(XenDevice *xendev, Error **errp);
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typedef void (*XenDeviceRealize)(XenDevice *xendev, Error **errp);
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typedef void (*XenDeviceFrontendChanged)(XenDevice *xendev,
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enum xenbus_state frontend_state,
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Error **errp);
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typedef void (*XenDeviceUnrealize)(XenDevice *xendev);
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struct XenDeviceClass {
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/*< private >*/
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DeviceClass parent_class;
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/*< public >*/
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const char *backend;
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const char *device;
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XenDeviceGetName get_name;
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XenDeviceRealize realize;
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XenDeviceFrontendChanged frontend_changed;
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XenDeviceUnrealize unrealize;
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};
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#define TYPE_XEN_DEVICE "xen-device"
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OBJECT_DECLARE_TYPE(XenDevice, XenDeviceClass, XEN_DEVICE)
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struct XenBus {
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BusState qbus;
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domid_t backend_id;
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struct xs_handle *xsh;
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XenWatchList *watch_list;
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unsigned int backend_types;
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XenWatch **backend_watch;
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QLIST_HEAD(, XenDevice) inactive_devices;
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};
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struct XenBusClass {
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/*< private >*/
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BusClass parent_class;
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};
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#define TYPE_XEN_BUS "xen-bus"
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OBJECT_DECLARE_TYPE(XenBus, XenBusClass,
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XEN_BUS)
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void xen_bus_init(void);
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void xen_device_backend_set_state(XenDevice *xendev,
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enum xenbus_state state);
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enum xenbus_state xen_device_backend_get_state(XenDevice *xendev);
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void xen_device_backend_printf(XenDevice *xendev, const char *key,
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const char *fmt, ...)
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GCC_FMT_ATTR(3, 4);
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void xen_device_frontend_printf(XenDevice *xendev, const char *key,
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const char *fmt, ...)
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GCC_FMT_ATTR(3, 4);
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int xen_device_frontend_scanf(XenDevice *xendev, const char *key,
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const char *fmt, ...);
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void xen_device_set_max_grant_refs(XenDevice *xendev, unsigned int nr_refs,
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Error **errp);
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void *xen_device_map_grant_refs(XenDevice *xendev, uint32_t *refs,
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unsigned int nr_refs, int prot,
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Error **errp);
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void xen_device_unmap_grant_refs(XenDevice *xendev, void *map,
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unsigned int nr_refs, Error **errp);
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typedef struct XenDeviceGrantCopySegment {
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union {
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void *virt;
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struct {
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uint32_t ref;
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off_t offset;
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} foreign;
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} source, dest;
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size_t len;
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} XenDeviceGrantCopySegment;
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void xen_device_copy_grant_refs(XenDevice *xendev, bool to_domain,
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XenDeviceGrantCopySegment segs[],
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unsigned int nr_segs, Error **errp);
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typedef bool (*XenEventHandler)(void *opaque);
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XenEventChannel *xen_device_bind_event_channel(XenDevice *xendev,
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unsigned int port,
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XenEventHandler handler,
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void *opaque, Error **errp);
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void xen_device_set_event_channel_context(XenDevice *xendev,
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XenEventChannel *channel,
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AioContext *ctx,
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Error **errp);
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void xen_device_notify_event_channel(XenDevice *xendev,
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XenEventChannel *channel,
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Error **errp);
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void xen_device_unbind_event_channel(XenDevice *xendev,
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XenEventChannel *channel,
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Error **errp);
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#endif /* HW_XEN_BUS_H */
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