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#include "kvm/devices.h"
#include "kvm/fdt.h"
#include "kvm/kvm.h"
#include "kvm/kvm-cpu.h"
#include "kvm/virtio-mmio.h"
#include "arm-common/gic.h"
#include "arm-common/pci.h"
#include <stdbool.h>
#include <linux/byteorder.h>
#include <linux/kernel.h>
#include <linux/sizes.h>
#include <linux/psci.h>
static void dump_fdt(const char *dtb_file, void *fdt)
{
int count, fd;
fd = open(dtb_file, O_CREAT | O_TRUNC | O_RDWR, 0666);
if (fd < 0)
die("Failed to write dtb to %s", dtb_file);
count = write(fd, fdt, FDT_MAX_SIZE);
if (count < 0)
die_perror("Failed to dump dtb");
pr_debug("Wrote %d bytes to dtb %s", count, dtb_file);
close(fd);
}
#define CPU_NAME_MAX_LEN 15
static void generate_cpu_nodes(void *fdt, struct kvm *kvm)
{
int cpu;
_FDT(fdt_begin_node(fdt, "cpus"));
_FDT(fdt_property_cell(fdt, "#address-cells", 0x1));
_FDT(fdt_property_cell(fdt, "#size-cells", 0x0));
for (cpu = 0; cpu < kvm->nrcpus; ++cpu) {
char cpu_name[CPU_NAME_MAX_LEN];
struct kvm_cpu *vcpu = kvm->cpus[cpu];
unsigned long mpidr = kvm_cpu__get_vcpu_mpidr(vcpu);
mpidr &= ARM_MPIDR_HWID_BITMASK;
snprintf(cpu_name, CPU_NAME_MAX_LEN, "cpu@%lx", mpidr);
_FDT(fdt_begin_node(fdt, cpu_name));
_FDT(fdt_property_string(fdt, "device_type", "cpu"));
_FDT(fdt_property_string(fdt, "compatible", vcpu->cpu_compatible));
if (kvm->nrcpus > 1)
_FDT(fdt_property_string(fdt, "enable-method", "psci"));
_FDT(fdt_property_cell(fdt, "reg", mpidr));
_FDT(fdt_end_node(fdt));
}
_FDT(fdt_end_node(fdt));
}
static void generate_irq_prop(void *fdt, u8 irq, enum irq_type irq_type)
{
u32 irq_prop[] = {
cpu_to_fdt32(GIC_FDT_IRQ_TYPE_SPI),
cpu_to_fdt32(irq - GIC_SPI_IRQ_BASE),
cpu_to_fdt32(irq_type)
};
_FDT(fdt_property(fdt, "interrupts", irq_prop, sizeof(irq_prop)));
}
struct psci_fns {
u32 cpu_suspend;
u32 cpu_off;
u32 cpu_on;
u32 migrate;
};
static struct psci_fns psci_0_1_fns = {
.cpu_suspend = KVM_PSCI_FN_CPU_SUSPEND,
.cpu_off = KVM_PSCI_FN_CPU_OFF,
.cpu_on = KVM_PSCI_FN_CPU_ON,
.migrate = KVM_PSCI_FN_MIGRATE,
};
static struct psci_fns psci_0_2_aarch32_fns = {
.cpu_suspend = PSCI_0_2_FN_CPU_SUSPEND,
.cpu_off = PSCI_0_2_FN_CPU_OFF,
.cpu_on = PSCI_0_2_FN_CPU_ON,
.migrate = PSCI_0_2_FN_MIGRATE,
};
static struct psci_fns psci_0_2_aarch64_fns = {
.cpu_suspend = PSCI_0_2_FN64_CPU_SUSPEND,
.cpu_off = PSCI_0_2_FN_CPU_OFF,
.cpu_on = PSCI_0_2_FN64_CPU_ON,
.migrate = PSCI_0_2_FN64_MIGRATE,
};
static int setup_fdt(struct kvm *kvm)
{
struct device_header *dev_hdr;
u8 staging_fdt[FDT_MAX_SIZE];
u64 mem_reg_prop[] = {
cpu_to_fdt64(kvm->arch.memory_guest_start),
cpu_to_fdt64(kvm->ram_size),
};
struct psci_fns *fns;
void *fdt = staging_fdt;
void *fdt_dest = guest_flat_to_host(kvm,
kvm->arch.dtb_guest_start);
void (*generate_mmio_fdt_nodes)(void *, struct device_header *,
void (*)(void *, u8, enum irq_type));
void (*generate_cpu_peripheral_fdt_nodes)(void *, struct kvm *)
= kvm->cpus[0]->generate_fdt_nodes;
/* Create new tree without a reserve map */
_FDT(fdt_create(fdt, FDT_MAX_SIZE));
_FDT(fdt_finish_reservemap(fdt));
/* Header */
_FDT(fdt_begin_node(fdt, ""));
_FDT(fdt_property_cell(fdt, "interrupt-parent", PHANDLE_GIC));
_FDT(fdt_property_string(fdt, "compatible", "linux,dummy-virt"));
_FDT(fdt_property_cell(fdt, "#address-cells", 0x2));
_FDT(fdt_property_cell(fdt, "#size-cells", 0x2));
/* /chosen */
_FDT(fdt_begin_node(fdt, "chosen"));
_FDT(fdt_property_cell(fdt, "linux,pci-probe-only", 1));
/* Pass on our amended command line to a Linux kernel only. */
if (kvm->cfg.firmware_filename) {
if (kvm->cfg.kernel_cmdline)
_FDT(fdt_property_string(fdt, "bootargs",
kvm->cfg.kernel_cmdline));
} else
_FDT(fdt_property_string(fdt, "bootargs",
kvm->cfg.real_cmdline));
_FDT(fdt_property_u64(fdt, "kaslr-seed", kvm->cfg.arch.kaslr_seed));
/* Initrd */
if (kvm->arch.initrd_size != 0) {
u64 ird_st_prop = cpu_to_fdt64(kvm->arch.initrd_guest_start);
u64 ird_end_prop = cpu_to_fdt64(kvm->arch.initrd_guest_start +
kvm->arch.initrd_size);
_FDT(fdt_property(fdt, "linux,initrd-start",
&ird_st_prop, sizeof(ird_st_prop)));
_FDT(fdt_property(fdt, "linux,initrd-end",
&ird_end_prop, sizeof(ird_end_prop)));
}
_FDT(fdt_end_node(fdt));
/* Memory */
_FDT(fdt_begin_node(fdt, "memory"));
_FDT(fdt_property_string(fdt, "device_type", "memory"));
_FDT(fdt_property(fdt, "reg", mem_reg_prop, sizeof(mem_reg_prop)));
_FDT(fdt_end_node(fdt));
/* CPU and peripherals (interrupt controller, timers, etc) */
generate_cpu_nodes(fdt, kvm);
if (generate_cpu_peripheral_fdt_nodes)
generate_cpu_peripheral_fdt_nodes(fdt, kvm);
/* Virtio MMIO devices */
dev_hdr = device__first_dev(DEVICE_BUS_MMIO);
while (dev_hdr) {
generate_mmio_fdt_nodes = dev_hdr->data;
generate_mmio_fdt_nodes(fdt, dev_hdr, generate_irq_prop);
dev_hdr = device__next_dev(dev_hdr);
}
/* IOPORT devices (!) */
dev_hdr = device__first_dev(DEVICE_BUS_IOPORT);
while (dev_hdr) {
generate_mmio_fdt_nodes = dev_hdr->data;
generate_mmio_fdt_nodes(fdt, dev_hdr, generate_irq_prop);
dev_hdr = device__next_dev(dev_hdr);
}
/* PCI host controller */
pci__generate_fdt_nodes(fdt);
/* PSCI firmware */
_FDT(fdt_begin_node(fdt, "psci"));
if (kvm__supports_extension(kvm, KVM_CAP_ARM_PSCI_0_2)) {
const char compatible[] = "arm,psci-0.2\0arm,psci";
_FDT(fdt_property(fdt, "compatible",
compatible, sizeof(compatible)));
if (kvm->cfg.arch.aarch32_guest)
fns = &psci_0_2_aarch32_fns;
else
fns = &psci_0_2_aarch64_fns;
} else {
_FDT(fdt_property_string(fdt, "compatible", "arm,psci"));
fns = &psci_0_1_fns;
}
_FDT(fdt_property_string(fdt, "method", "hvc"));
_FDT(fdt_property_cell(fdt, "cpu_suspend", fns->cpu_suspend));
_FDT(fdt_property_cell(fdt, "cpu_off", fns->cpu_off));
_FDT(fdt_property_cell(fdt, "cpu_on", fns->cpu_on));
_FDT(fdt_property_cell(fdt, "migrate", fns->migrate));
_FDT(fdt_end_node(fdt));
/* Finalise. */
_FDT(fdt_end_node(fdt));
_FDT(fdt_finish(fdt));
_FDT(fdt_open_into(fdt, fdt_dest, FDT_MAX_SIZE));
_FDT(fdt_pack(fdt_dest));
if (kvm->cfg.arch.dump_dtb_filename)
dump_fdt(kvm->cfg.arch.dump_dtb_filename, fdt_dest);
return 0;
}
late_init(setup_fdt);
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