From: David Woodhouse <d...@amazon.co.uk>
Signed-off-by: David Woodhouse <d...@amazon.co.uk>
---
hw/i386/kvm/meson.build | 1 +
hw/i386/kvm/xen_gnttab.c | 110 ++++++++++++++++++++++++++++++++++++++
hw/i386/kvm/xen_gnttab.h | 18 +++++++
hw/i386/pc.c | 2 +
target/i386/kvm/xen-emu.c | 3 ++
5 files changed, 134 insertions(+)
create mode 100644 hw/i386/kvm/xen_gnttab.c
create mode 100644 hw/i386/kvm/xen_gnttab.h
diff --git a/hw/i386/kvm/meson.build b/hw/i386/kvm/meson.build
index cab64df339..e02449e4d4 100644
--- a/hw/i386/kvm/meson.build
+++ b/hw/i386/kvm/meson.build
@@ -7,6 +7,7 @@ i386_kvm_ss.add(when: 'CONFIG_IOAPIC', if_true:
files('ioapic.c'))
i386_kvm_ss.add(when: 'CONFIG_XEN_EMU', if_true: files(
'xen_overlay.c',
'xen_evtchn.c',
+ 'xen_gnttab.c',
))
i386_ss.add_all(when: 'CONFIG_KVM', if_true: i386_kvm_ss)
diff --git a/hw/i386/kvm/xen_gnttab.c b/hw/i386/kvm/xen_gnttab.c
new file mode 100644
index 0000000000..7a441445cd
--- /dev/null
+++ b/hw/i386/kvm/xen_gnttab.c
@@ -0,0 +1,110 @@
+/*
+ * QEMU Xen emulation: Grant table support
+ *
+ * Copyright © 2022 Amazon.com, Inc. or its affiliates. All Rights Reserved.
+ *
+ * Authors: David Woodhouse <dw...@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/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 "standard-headers/xen/memory.h"
+#include "standard-headers/xen/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;
+}
+
diff --git a/hw/i386/kvm/xen_gnttab.h b/hw/i386/kvm/xen_gnttab.h
new file mode 100644
index 0000000000..a7caa94c83
--- /dev/null
+++ b/hw/i386/kvm/xen_gnttab.h
@@ -0,0 +1,18 @@
+/*
+ * QEMU Xen emulation: Grant table support
+ *
+ * Copyright © 2022 Amazon.com, Inc. or its affiliates. All Rights Reserved.
+ *
+ * Authors: David Woodhouse <dw...@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.
+ */
+
+#ifndef QEMU_XEN_GNTTAB_H
+#define QEMU_XEN_GNTTAB_H
+
+void xen_gnttab_create(void);
+int xen_gnttab_map_page(uint64_t idx, uint64_t gfn);
+
+#endif /* QEMU_XEN_GNTTAB_H */
diff --git a/hw/i386/pc.c b/hw/i386/pc.c
index 1c4941de8f..4f044bc7da 100644
--- a/hw/i386/pc.c
+++ b/hw/i386/pc.c
@@ -91,6 +91,7 @@
#include "hw/virtio/virtio-mem-pci.h"
#include "hw/i386/kvm/xen_overlay.h"
#include "hw/i386/kvm/xen_evtchn.h"
+#include "hw/i386/kvm/xen_gnttab.h"
#include "hw/mem/memory-device.h"
#include "sysemu/replay.h"
#include "target/i386/cpu.h"
@@ -1856,6 +1857,7 @@ int pc_machine_kvm_type(MachineState *machine, const char
*kvm_type)
if (xen_mode == XEN_EMULATE) {
xen_overlay_create();
xen_evtchn_create();
+ xen_gnttab_create();
}
#endif
return 0;
diff --git a/target/i386/kvm/xen-emu.c b/target/i386/kvm/xen-emu.c
index fd3e2464ee..931e74670b 100644
--- a/target/i386/kvm/xen-emu.c
+++ b/target/i386/kvm/xen-emu.c
@@ -26,6 +26,7 @@
#include "hw/i386/apic-msidef.h"
#include "hw/i386/kvm/xen_overlay.h"
#include "hw/i386/kvm/xen_evtchn.h"
+#include "hw/i386/kvm/xen_gnttab.h"
#include "standard-headers/xen/version.h"
#include "standard-headers/xen/sched.h"
@@ -502,6 +503,8 @@ static int add_to_physmap_one(uint32_t space, uint64_t idx,
uint64_t gfn)
return xen_set_shared_info(gfn);
case XENMAPSPACE_grant_table:
+ return xen_gnttab_map_page(idx, gfn);
+
case XENMAPSPACE_gmfn:
case XENMAPSPACE_gmfn_range:
return -ENOTSUP;
--
2.35.3
