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>
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@ -7,6 +7,7 @@ i386_kvm_ss.add(when: 'CONFIG_IOAPIC', if_true: files('ioapic.c'))
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i386_kvm_ss.add(when: 'CONFIG_XEN_EMU', if_true: files(
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'xen_overlay.c',
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'xen_evtchn.c',
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'xen_gnttab.c',
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))
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i386_ss.add_all(when: 'CONFIG_KVM', if_true: i386_kvm_ss)
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@ -0,0 +1,111 @@
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/*
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* QEMU Xen emulation: Grant table support
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*
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* Copyright © 2022 Amazon.com, Inc. or its affiliates. All Rights Reserved.
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*
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* Authors: David Woodhouse <dwmw2@infradead.org>
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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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#include "qemu/osdep.h"
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#include "qemu/host-utils.h"
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#include "qemu/module.h"
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#include "qemu/lockable.h"
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#include "qemu/main-loop.h"
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#include "qapi/error.h"
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#include "qom/object.h"
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#include "exec/target_page.h"
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#include "exec/address-spaces.h"
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#include "migration/vmstate.h"
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#include "hw/sysbus.h"
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#include "hw/xen/xen.h"
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#include "xen_overlay.h"
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#include "xen_gnttab.h"
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#include "sysemu/kvm.h"
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#include "sysemu/kvm_xen.h"
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#include "hw/xen/interface/memory.h"
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#include "hw/xen/interface/grant_table.h"
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#define TYPE_XEN_GNTTAB "xen-gnttab"
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OBJECT_DECLARE_SIMPLE_TYPE(XenGnttabState, XEN_GNTTAB)
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#define XEN_PAGE_SHIFT 12
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#define XEN_PAGE_SIZE (1ULL << XEN_PAGE_SHIFT)
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struct XenGnttabState {
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/*< private >*/
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SysBusDevice busdev;
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/*< public >*/
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uint32_t nr_frames;
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uint32_t max_frames;
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};
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struct XenGnttabState *xen_gnttab_singleton;
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static void xen_gnttab_realize(DeviceState *dev, Error **errp)
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{
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XenGnttabState *s = XEN_GNTTAB(dev);
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if (xen_mode != XEN_EMULATE) {
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error_setg(errp, "Xen grant table support is for Xen emulation");
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return;
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}
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s->nr_frames = 0;
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s->max_frames = kvm_xen_get_gnttab_max_frames();
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}
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static bool xen_gnttab_is_needed(void *opaque)
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{
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return xen_mode == XEN_EMULATE;
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}
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static const VMStateDescription xen_gnttab_vmstate = {
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.name = "xen_gnttab",
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.version_id = 1,
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.minimum_version_id = 1,
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.needed = xen_gnttab_is_needed,
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.fields = (VMStateField[]) {
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VMSTATE_UINT32(nr_frames, XenGnttabState),
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VMSTATE_END_OF_LIST()
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}
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};
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static void xen_gnttab_class_init(ObjectClass *klass, void *data)
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{
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DeviceClass *dc = DEVICE_CLASS(klass);
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dc->realize = xen_gnttab_realize;
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dc->vmsd = &xen_gnttab_vmstate;
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}
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static const TypeInfo xen_gnttab_info = {
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.name = TYPE_XEN_GNTTAB,
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.parent = TYPE_SYS_BUS_DEVICE,
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.instance_size = sizeof(XenGnttabState),
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.class_init = xen_gnttab_class_init,
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};
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void xen_gnttab_create(void)
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{
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xen_gnttab_singleton = XEN_GNTTAB(sysbus_create_simple(TYPE_XEN_GNTTAB,
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-1, NULL));
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}
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static void xen_gnttab_register_types(void)
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{
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type_register_static(&xen_gnttab_info);
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}
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type_init(xen_gnttab_register_types)
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int xen_gnttab_map_page(uint64_t idx, uint64_t gfn)
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{
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return -ENOSYS;
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}
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@ -0,0 +1,18 @@
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/*
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* QEMU Xen emulation: Grant table support
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*
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* Copyright © 2022 Amazon.com, Inc. or its affiliates. All Rights Reserved.
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*
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* Authors: David Woodhouse <dwmw2@infradead.org>
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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 QEMU_XEN_GNTTAB_H
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#define QEMU_XEN_GNTTAB_H
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void xen_gnttab_create(void);
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int xen_gnttab_map_page(uint64_t idx, uint64_t gfn);
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#endif /* QEMU_XEN_GNTTAB_H */
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@ -92,6 +92,7 @@
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#include "hw/virtio/virtio-mem-pci.h"
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#include "hw/i386/kvm/xen_overlay.h"
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#include "hw/i386/kvm/xen_evtchn.h"
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#include "hw/i386/kvm/xen_gnttab.h"
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#include "hw/mem/memory-device.h"
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#include "sysemu/replay.h"
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#include "target/i386/cpu.h"
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@ -1860,6 +1861,7 @@ int pc_machine_kvm_type(MachineState *machine, const char *kvm_type)
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if (xen_mode == XEN_EMULATE) {
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xen_overlay_create();
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xen_evtchn_create();
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xen_gnttab_create();
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}
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#endif
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return 0;
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@ -25,6 +25,7 @@
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#include "hw/i386/apic-msidef.h"
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#include "hw/i386/kvm/xen_overlay.h"
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#include "hw/i386/kvm/xen_evtchn.h"
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#include "hw/i386/kvm/xen_gnttab.h"
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#include "hw/xen/interface/version.h"
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#include "hw/xen/interface/sched.h"
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@ -563,6 +564,8 @@ static int add_to_physmap_one(uint32_t space, uint64_t idx, uint64_t gfn)
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return xen_set_shared_info(gfn);
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case XENMAPSPACE_grant_table:
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return xen_gnttab_map_page(idx, gfn);
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case XENMAPSPACE_gmfn:
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case XENMAPSPACE_gmfn_range:
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return -ENOTSUP;
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