f80fad16af
The previous commit introduced redirectable gnttab operations fairly much like-for-like, with the exception of the extra arguments to the ->open() call which were always NULL/0 anyway. This *changes* the arguments to the ->unmap() operation to include the original ref# that was mapped. Under real Xen it isn't necessary; all we need to do from QEMU is munmap(), then the kernel will release the grant, and Xen does the tracking/refcounting for the guest. When we have emulated grant tables though, we need to do all that for ourselves. So let's have the back ends keep track of what they mapped and pass it in to the ->unmap() method for us. Signed-off-by: David Woodhouse <dwmw@amazon.co.uk> Reviewed-by: Paul Durrant <paul@xen.org>
141 lines
4.6 KiB
C
141 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_backend_ops.h"
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#include "hw/xen/interface/io/xenbus.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 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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G_GNUC_PRINTF(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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G_GNUC_PRINTF(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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G_GNUC_SCANF(3, 4);
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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, uint32_t *refs,
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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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