mirror of
https://github.com/Motorhead1991/qemu.git
synced 2025-07-29 05:13:54 -06:00
c412ba47b2
Move the existing code using libxengnttab to xen-operations.c and allow the operations to be redirected so that we can add emulation of grant table mapping for backend drivers. In emulation, mapping more than one grant ref to be virtually contiguous would be fairly difficult. The best way to do it might be to make the ram_block mappings actually backed by a file (shmem or a deleted file, perhaps) so that we can have multiple *shared* mappings of it. But that would be fairly intrusive. Making the backend drivers cope with page *lists* instead of expecting the mapping to be contiguous is also non-trivial, since some structures would actually *cross* page boundaries (e.g. the 32-bit blkif responses which are 12 bytes). So for now, we'll support only single-page mappings in emulation. Add a XEN_GNTTAB_OP_FEATURE_MAP_MULTIPLE flag to indicate that the native Xen implementation *does* support multi-page maps, and a helper function to query it. Signed-off-by: David Woodhouse <dwmw@amazon.co.uk> Reviewed-by: Paul Durrant <paul@xen.org>
140 lines
4.6 KiB
C
140 lines
4.6 KiB
C
/*
|
|
* Copyright (c) 2018 Citrix Systems Inc.
|
|
*
|
|
* This work is licensed under the terms of the GNU GPL, version 2 or later.
|
|
* See the COPYING file in the top-level directory.
|
|
*/
|
|
|
|
#ifndef HW_XEN_BUS_H
|
|
#define HW_XEN_BUS_H
|
|
|
|
#include "hw/xen/xen_backend_ops.h"
|
|
#include "hw/xen/interface/io/xenbus.h"
|
|
#include "hw/sysbus.h"
|
|
#include "qemu/notify.h"
|
|
#include "qom/object.h"
|
|
|
|
typedef void (*XenWatchHandler)(void *opaque);
|
|
|
|
typedef struct XenWatchList XenWatchList;
|
|
typedef struct XenWatch XenWatch;
|
|
typedef struct XenEventChannel XenEventChannel;
|
|
|
|
struct XenDevice {
|
|
DeviceState qdev;
|
|
domid_t frontend_id;
|
|
char *name;
|
|
struct xs_handle *xsh;
|
|
XenWatchList *watch_list;
|
|
char *backend_path, *frontend_path;
|
|
enum xenbus_state backend_state, frontend_state;
|
|
Notifier exit;
|
|
XenWatch *backend_state_watch, *frontend_state_watch;
|
|
bool backend_online;
|
|
XenWatch *backend_online_watch;
|
|
xengnttab_handle *xgth;
|
|
bool inactive;
|
|
QLIST_HEAD(, XenEventChannel) event_channels;
|
|
QLIST_ENTRY(XenDevice) list;
|
|
};
|
|
typedef struct XenDevice XenDevice;
|
|
|
|
typedef char *(*XenDeviceGetName)(XenDevice *xendev, Error **errp);
|
|
typedef void (*XenDeviceRealize)(XenDevice *xendev, Error **errp);
|
|
typedef void (*XenDeviceFrontendChanged)(XenDevice *xendev,
|
|
enum xenbus_state frontend_state,
|
|
Error **errp);
|
|
typedef void (*XenDeviceUnrealize)(XenDevice *xendev);
|
|
|
|
struct XenDeviceClass {
|
|
/*< private >*/
|
|
DeviceClass parent_class;
|
|
/*< public >*/
|
|
const char *backend;
|
|
const char *device;
|
|
XenDeviceGetName get_name;
|
|
XenDeviceRealize realize;
|
|
XenDeviceFrontendChanged frontend_changed;
|
|
XenDeviceUnrealize unrealize;
|
|
};
|
|
|
|
#define TYPE_XEN_DEVICE "xen-device"
|
|
OBJECT_DECLARE_TYPE(XenDevice, XenDeviceClass, XEN_DEVICE)
|
|
|
|
struct XenBus {
|
|
BusState qbus;
|
|
domid_t backend_id;
|
|
struct xs_handle *xsh;
|
|
XenWatchList *watch_list;
|
|
unsigned int backend_types;
|
|
XenWatch **backend_watch;
|
|
QLIST_HEAD(, XenDevice) inactive_devices;
|
|
};
|
|
|
|
struct XenBusClass {
|
|
/*< private >*/
|
|
BusClass parent_class;
|
|
};
|
|
|
|
#define TYPE_XEN_BUS "xen-bus"
|
|
OBJECT_DECLARE_TYPE(XenBus, XenBusClass,
|
|
XEN_BUS)
|
|
|
|
void xen_bus_init(void);
|
|
|
|
void xen_device_backend_set_state(XenDevice *xendev,
|
|
enum xenbus_state state);
|
|
enum xenbus_state xen_device_backend_get_state(XenDevice *xendev);
|
|
|
|
void xen_device_backend_printf(XenDevice *xendev, const char *key,
|
|
const char *fmt, ...)
|
|
G_GNUC_PRINTF(3, 4);
|
|
void xen_device_frontend_printf(XenDevice *xendev, const char *key,
|
|
const char *fmt, ...)
|
|
G_GNUC_PRINTF(3, 4);
|
|
|
|
int xen_device_frontend_scanf(XenDevice *xendev, const char *key,
|
|
const char *fmt, ...)
|
|
G_GNUC_SCANF(3, 4);
|
|
|
|
void xen_device_set_max_grant_refs(XenDevice *xendev, unsigned int nr_refs,
|
|
Error **errp);
|
|
void *xen_device_map_grant_refs(XenDevice *xendev, uint32_t *refs,
|
|
unsigned int nr_refs, int prot,
|
|
Error **errp);
|
|
void xen_device_unmap_grant_refs(XenDevice *xendev, void *map,
|
|
unsigned int nr_refs, Error **errp);
|
|
|
|
typedef struct XenDeviceGrantCopySegment {
|
|
union {
|
|
void *virt;
|
|
struct {
|
|
uint32_t ref;
|
|
off_t offset;
|
|
} foreign;
|
|
} source, dest;
|
|
size_t len;
|
|
} XenDeviceGrantCopySegment;
|
|
|
|
void xen_device_copy_grant_refs(XenDevice *xendev, bool to_domain,
|
|
XenDeviceGrantCopySegment segs[],
|
|
unsigned int nr_segs, Error **errp);
|
|
|
|
typedef bool (*XenEventHandler)(void *opaque);
|
|
|
|
XenEventChannel *xen_device_bind_event_channel(XenDevice *xendev,
|
|
unsigned int port,
|
|
XenEventHandler handler,
|
|
void *opaque, Error **errp);
|
|
void xen_device_set_event_channel_context(XenDevice *xendev,
|
|
XenEventChannel *channel,
|
|
AioContext *ctx,
|
|
Error **errp);
|
|
void xen_device_notify_event_channel(XenDevice *xendev,
|
|
XenEventChannel *channel,
|
|
Error **errp);
|
|
void xen_device_unbind_event_channel(XenDevice *xendev,
|
|
XenEventChannel *channel,
|
|
Error **errp);
|
|
|
|
#endif /* HW_XEN_BUS_H */
|