qemu/hw/i386/kvm/xen_gnttab.c
David Woodhouse a28b0fc034 hw/xen: Add xen_gnttab device for grant table emulation
Signed-off-by: David Woodhouse <dwmw@amazon.co.uk>
Reviewed-by: Paul Durrant <paul@xen.org>
2023-03-01 09:07:52 +00:00

112 lines
2.6 KiB
C

/*
* QEMU Xen emulation: Grant table support
*
* Copyright © 2022 Amazon.com, Inc. or its affiliates. All Rights Reserved.
*
* Authors: David Woodhouse <dwmw2@infradead.org>
*
* This work is licensed under the terms of the GNU GPL, version 2 or later.
* See the COPYING file in the top-level directory.
*/
#include "qemu/osdep.h"
#include "qemu/host-utils.h"
#include "qemu/module.h"
#include "qemu/lockable.h"
#include "qemu/main-loop.h"
#include "qapi/error.h"
#include "qom/object.h"
#include "exec/target_page.h"
#include "exec/address-spaces.h"
#include "migration/vmstate.h"
#include "hw/sysbus.h"
#include "hw/xen/xen.h"
#include "xen_overlay.h"
#include "xen_gnttab.h"
#include "sysemu/kvm.h"
#include "sysemu/kvm_xen.h"
#include "hw/xen/interface/memory.h"
#include "hw/xen/interface/grant_table.h"
#define TYPE_XEN_GNTTAB "xen-gnttab"
OBJECT_DECLARE_SIMPLE_TYPE(XenGnttabState, XEN_GNTTAB)
#define XEN_PAGE_SHIFT 12
#define XEN_PAGE_SIZE (1ULL << XEN_PAGE_SHIFT)
struct XenGnttabState {
/*< private >*/
SysBusDevice busdev;
/*< public >*/
uint32_t nr_frames;
uint32_t max_frames;
};
struct XenGnttabState *xen_gnttab_singleton;
static void xen_gnttab_realize(DeviceState *dev, Error **errp)
{
XenGnttabState *s = XEN_GNTTAB(dev);
if (xen_mode != XEN_EMULATE) {
error_setg(errp, "Xen grant table support is for Xen emulation");
return;
}
s->nr_frames = 0;
s->max_frames = kvm_xen_get_gnttab_max_frames();
}
static bool xen_gnttab_is_needed(void *opaque)
{
return xen_mode == XEN_EMULATE;
}
static const VMStateDescription xen_gnttab_vmstate = {
.name = "xen_gnttab",
.version_id = 1,
.minimum_version_id = 1,
.needed = xen_gnttab_is_needed,
.fields = (VMStateField[]) {
VMSTATE_UINT32(nr_frames, XenGnttabState),
VMSTATE_END_OF_LIST()
}
};
static void xen_gnttab_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
dc->realize = xen_gnttab_realize;
dc->vmsd = &xen_gnttab_vmstate;
}
static const TypeInfo xen_gnttab_info = {
.name = TYPE_XEN_GNTTAB,
.parent = TYPE_SYS_BUS_DEVICE,
.instance_size = sizeof(XenGnttabState),
.class_init = xen_gnttab_class_init,
};
void xen_gnttab_create(void)
{
xen_gnttab_singleton = XEN_GNTTAB(sysbus_create_simple(TYPE_XEN_GNTTAB,
-1, NULL));
}
static void xen_gnttab_register_types(void)
{
type_register_static(&xen_gnttab_info);
}
type_init(xen_gnttab_register_types)
int xen_gnttab_map_page(uint64_t idx, uint64_t gfn)
{
return -ENOSYS;
}