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/*
* Guest Loader
*
* Copyright (C) 2020 Linaro
* Written by Alex Bennée <alex.bennee@linaro.org>
* (based on the generic-loader by Li Guang <lig.fnst@cn.fujitsu.com>)
*
* SPDX-License-Identifier: GPL-2.0-or-later
*
* This work is licensed under the terms of the GNU GPL, version 2 or later.
* See the COPYING file in the top-level directory.
*/
/*
* Much like the generic-loader this is treated as a special device
* inside QEMU. However unlike the generic-loader this device is used
* to load guest images for hypervisors. As part of that process the
* hypervisor needs to have platform information passed to it by the
* lower levels of the stack (e.g. firmware/bootloader). If you boot
* the hypervisor directly you use the guest-loader to load the Dom0
* or equivalent guest images in the right place in the same way a
* boot loader would.
*
* This is only relevant for full system emulation.
*/
#include "qemu/osdep.h"
#include "hw/core/cpu.h"
#include "sysemu/dma.h"
#include "hw/loader.h"
#include "hw/qdev-properties.h"
#include "qapi/error.h"
#include "qemu/module.h"
#include "guest-loader.h"
#include "sysemu/device_tree.h"
#include "hw/boards.h"
/*
* Insert some FDT nodes for the loaded blob.
*/
static void loader_insert_platform_data(GuestLoaderState *s, int size,
Error **errp)
{
MachineState *machine = MACHINE(qdev_get_machine());
void *fdt = machine->fdt;
g_autofree char *node = g_strdup_printf("/chosen/module@0x%08" PRIx64,
s->addr);
uint64_t reg_attr[2] = {cpu_to_be64(s->addr), cpu_to_be64(size)};
if (!fdt) {
error_setg(errp, "Cannot modify FDT fields if the machine has none");
return;
}
qemu_fdt_add_subnode(fdt, node);
qemu_fdt_setprop(fdt, node, "reg", ®_attr, sizeof(reg_attr));
if (s->kernel) {
const char *compat[2] = { "multiboot,module", "multiboot,kernel" };
if (qemu_fdt_setprop_string_array(fdt, node, "compatible",
(char **) &compat,
ARRAY_SIZE(compat)) < 0) {
error_setg(errp, "couldn't set %s/compatible", node);
return;
}
if (s->args) {
if (qemu_fdt_setprop_string(fdt, node, "bootargs", s->args) < 0) {
error_setg(errp, "couldn't set %s/bootargs", node);
}
}
} else if (s->initrd) {
const char *compat[2] = { "multiboot,module", "multiboot,ramdisk" };
if (qemu_fdt_setprop_string_array(fdt, node, "compatible",
(char **) &compat,
ARRAY_SIZE(compat)) < 0) {
error_setg(errp, "couldn't set %s/compatible", node);
return;
}
}
}
static void guest_loader_realize(DeviceState *dev, Error **errp)
{
GuestLoaderState *s = GUEST_LOADER(dev);
char *file = s->kernel ? s->kernel : s->initrd;
int size = 0;
/* Perform some error checking on the user's options */
if (s->kernel && s->initrd) {
error_setg(errp, "Cannot specify a kernel and initrd in same stanza");
return;
} else if (!s->kernel && !s->initrd) {
error_setg(errp, "Need to specify a kernel or initrd image");
return;
} else if (!s->addr) {
error_setg(errp, "Need to specify the address of guest blob");
return;
} else if (s->args && !s->kernel) {
error_setg(errp, "Boot args only relevant to kernel blobs");
}
/* Default to the maximum size being the machine's ram size */
size = load_image_targphys_as(file, s->addr, current_machine->ram_size,
NULL);
if (size < 0) {
error_setg(errp, "Cannot load specified image %s", file);
return;
}
/* Now the image is loaded we need to update the platform data */
loader_insert_platform_data(s, size, errp);
}
static const Property guest_loader_props[] = {
DEFINE_PROP_UINT64("addr", GuestLoaderState, addr, 0),
DEFINE_PROP_STRING("kernel", GuestLoaderState, kernel),
DEFINE_PROP_STRING("bootargs", GuestLoaderState, args),
DEFINE_PROP_STRING("initrd", GuestLoaderState, initrd),
};
static void guest_loader_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
dc->realize = guest_loader_realize;
device_class_set_props(dc, guest_loader_props);
dc->desc = "Guest Loader";
set_bit(DEVICE_CATEGORY_MISC, dc->categories);
}
static const TypeInfo guest_loader_info = {
.name = TYPE_GUEST_LOADER,
.parent = TYPE_DEVICE,
.instance_size = sizeof(GuestLoaderState),
.class_init = guest_loader_class_init,
};
static void guest_loader_register_type(void)
{
type_register_static(&guest_loader_info);
}
type_init(guest_loader_register_type)
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