2 * QEMU Xen emulation: Grant table support
4 * Copyright © 2022 Amazon.com, Inc. or its affiliates. All Rights Reserved.
6 * Authors: David Woodhouse <dwmw2@infradead.org>
8 * This work is licensed under the terms of the GNU GPL, version 2 or later.
9 * See the COPYING file in the top-level directory.
12 #include "qemu/osdep.h"
13 #include "qemu/host-utils.h"
14 #include "qemu/module.h"
15 #include "qemu/lockable.h"
16 #include "qemu/main-loop.h"
17 #include "qapi/error.h"
18 #include "qom/object.h"
19 #include "exec/target_page.h"
20 #include "exec/address-spaces.h"
21 #include "migration/vmstate.h"
23 #include "hw/sysbus.h"
24 #include "hw/xen/xen.h"
25 #include "xen_overlay.h"
26 #include "xen_gnttab.h"
28 #include "sysemu/kvm.h"
29 #include "sysemu/kvm_xen.h"
31 #include "hw/xen/interface/memory.h"
32 #include "hw/xen/interface/grant_table.h"
34 #define TYPE_XEN_GNTTAB "xen-gnttab"
35 OBJECT_DECLARE_SIMPLE_TYPE(XenGnttabState, XEN_GNTTAB)
37 #define XEN_PAGE_SHIFT 12
38 #define XEN_PAGE_SIZE (1ULL << XEN_PAGE_SHIFT)
40 struct XenGnttabState {
49 struct XenGnttabState *xen_gnttab_singleton;
51 static void xen_gnttab_realize(DeviceState *dev, Error **errp)
53 XenGnttabState *s = XEN_GNTTAB(dev);
55 if (xen_mode != XEN_EMULATE) {
56 error_setg(errp, "Xen grant table support is for Xen emulation");
60 s->max_frames = kvm_xen_get_gnttab_max_frames();
63 static bool xen_gnttab_is_needed(void *opaque)
65 return xen_mode == XEN_EMULATE;
68 static const VMStateDescription xen_gnttab_vmstate = {
71 .minimum_version_id = 1,
72 .needed = xen_gnttab_is_needed,
73 .fields = (VMStateField[]) {
74 VMSTATE_UINT32(nr_frames, XenGnttabState),
79 static void xen_gnttab_class_init(ObjectClass *klass, void *data)
81 DeviceClass *dc = DEVICE_CLASS(klass);
83 dc->realize = xen_gnttab_realize;
84 dc->vmsd = &xen_gnttab_vmstate;
87 static const TypeInfo xen_gnttab_info = {
88 .name = TYPE_XEN_GNTTAB,
89 .parent = TYPE_SYS_BUS_DEVICE,
90 .instance_size = sizeof(XenGnttabState),
91 .class_init = xen_gnttab_class_init,
94 void xen_gnttab_create(void)
96 xen_gnttab_singleton = XEN_GNTTAB(sysbus_create_simple(TYPE_XEN_GNTTAB,
100 static void xen_gnttab_register_types(void)
102 type_register_static(&xen_gnttab_info);
105 type_init(xen_gnttab_register_types)
107 int xen_gnttab_map_page(uint64_t idx, uint64_t gfn)