/*
 * QEMU PC System Emulator
 *
 * Copyright (c) 2003-2004 Fabrice Bellard
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

#include "qemu/osdep.h"
#include "qemu/units.h"
#include "hw/i386/pc.h"
#include "hw/char/serial.h"
#include "hw/char/parallel.h"
#include "hw/hyperv/hv-balloon.h"
#include "hw/i386/fw_cfg.h"
#include "hw/i386/vmport.h"
#include "sysemu/cpus.h"
#include "hw/ide/internal.h"
#include "hw/timer/hpet.h"
#include "hw/loader.h"
#include "hw/rtc/mc146818rtc.h"
#include "hw/intc/i8259.h"
#include "hw/timer/i8254.h"
#include "hw/input/i8042.h"
#include "hw/audio/pcspk.h"
#include "sysemu/sysemu.h"
#include "sysemu/xen.h"
#include "sysemu/reset.h"
#include "kvm/kvm_i386.h"
#include "hw/xen/xen.h"
#include "qapi/qmp/qlist.h"
#include "qemu/error-report.h"
#include "hw/acpi/cpu_hotplug.h"
#include "acpi-build.h"
#include "hw/mem/nvdimm.h"
#include "hw/cxl/cxl_host.h"
#include "hw/usb.h"
#include "hw/i386/intel_iommu.h"
#include "hw/net/ne2000-isa.h"
#include "hw/virtio/virtio-iommu.h"
#include "hw/virtio/virtio-md-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/i386/kvm/xen_xenstore.h"
#include "hw/mem/memory-device.h"
#include "e820_memory_layout.h"
#include "trace.h"
#include CONFIG_DEVICES

#ifdef CONFIG_XEN_EMU
#include "hw/xen/xen-legacy-backend.h"
#include "hw/xen/xen-bus.h"
#endif

/*
 * Helper for setting model-id for CPU models that changed model-id
 * depending on QEMU versions up to QEMU 2.4.
 */
#define PC_CPU_MODEL_IDS(v) \
    { "qemu32-" TYPE_X86_CPU, "model-id", "QEMU Virtual CPU version " v, },\
    { "qemu64-" TYPE_X86_CPU, "model-id", "QEMU Virtual CPU version " v, },\
    { "athlon-" TYPE_X86_CPU, "model-id", "QEMU Virtual CPU version " v, },

GlobalProperty pc_compat_8_2[] = {};
const size_t pc_compat_8_2_len = G_N_ELEMENTS(pc_compat_8_2);

GlobalProperty pc_compat_8_1[] = {};
const size_t pc_compat_8_1_len = G_N_ELEMENTS(pc_compat_8_1);

GlobalProperty pc_compat_8_0[] = {
    { "virtio-mem", "unplugged-inaccessible", "auto" },
};
const size_t pc_compat_8_0_len = G_N_ELEMENTS(pc_compat_8_0);

GlobalProperty pc_compat_7_2[] = {
    { "ICH9-LPC", "noreboot", "true" },
};
const size_t pc_compat_7_2_len = G_N_ELEMENTS(pc_compat_7_2);

GlobalProperty pc_compat_7_1[] = {};
const size_t pc_compat_7_1_len = G_N_ELEMENTS(pc_compat_7_1);

GlobalProperty pc_compat_7_0[] = {};
const size_t pc_compat_7_0_len = G_N_ELEMENTS(pc_compat_7_0);

GlobalProperty pc_compat_6_2[] = {
    { "virtio-mem", "unplugged-inaccessible", "off" },
};
const size_t pc_compat_6_2_len = G_N_ELEMENTS(pc_compat_6_2);

GlobalProperty pc_compat_6_1[] = {
    { TYPE_X86_CPU, "hv-version-id-build", "0x1bbc" },
    { TYPE_X86_CPU, "hv-version-id-major", "0x0006" },
    { TYPE_X86_CPU, "hv-version-id-minor", "0x0001" },
    { "ICH9-LPC", "x-keep-pci-slot-hpc", "false" },
};
const size_t pc_compat_6_1_len = G_N_ELEMENTS(pc_compat_6_1);

GlobalProperty pc_compat_6_0[] = {
    { "qemu64" "-" TYPE_X86_CPU, "family", "6" },
    { "qemu64" "-" TYPE_X86_CPU, "model", "6" },
    { "qemu64" "-" TYPE_X86_CPU, "stepping", "3" },
    { TYPE_X86_CPU, "x-vendor-cpuid-only", "off" },
    { "ICH9-LPC", ACPI_PM_PROP_ACPI_PCIHP_BRIDGE, "off" },
    { "ICH9-LPC", "x-keep-pci-slot-hpc", "true" },
};
const size_t pc_compat_6_0_len = G_N_ELEMENTS(pc_compat_6_0);

GlobalProperty pc_compat_5_2[] = {
    { "ICH9-LPC", "x-smi-cpu-hotunplug", "off" },
};
const size_t pc_compat_5_2_len = G_N_ELEMENTS(pc_compat_5_2);

GlobalProperty pc_compat_5_1[] = {
    { "ICH9-LPC", "x-smi-cpu-hotplug", "off" },
    { TYPE_X86_CPU, "kvm-msi-ext-dest-id", "off" },
};
const size_t pc_compat_5_1_len = G_N_ELEMENTS(pc_compat_5_1);

GlobalProperty pc_compat_5_0[] = {
};
const size_t pc_compat_5_0_len = G_N_ELEMENTS(pc_compat_5_0);

GlobalProperty pc_compat_4_2[] = {
    { "mch", "smbase-smram", "off" },
};
const size_t pc_compat_4_2_len = G_N_ELEMENTS(pc_compat_4_2);

GlobalProperty pc_compat_4_1[] = {};
const size_t pc_compat_4_1_len = G_N_ELEMENTS(pc_compat_4_1);

GlobalProperty pc_compat_4_0[] = {};
const size_t pc_compat_4_0_len = G_N_ELEMENTS(pc_compat_4_0);

GlobalProperty pc_compat_3_1[] = {
    { "intel-iommu", "dma-drain", "off" },
    { "Opteron_G3" "-" TYPE_X86_CPU, "rdtscp", "off" },
    { "Opteron_G4" "-" TYPE_X86_CPU, "rdtscp", "off" },
    { "Opteron_G4" "-" TYPE_X86_CPU, "npt", "off" },
    { "Opteron_G4" "-" TYPE_X86_CPU, "nrip-save", "off" },
    { "Opteron_G5" "-" TYPE_X86_CPU, "rdtscp", "off" },
    { "Opteron_G5" "-" TYPE_X86_CPU, "npt", "off" },
    { "Opteron_G5" "-" TYPE_X86_CPU, "nrip-save", "off" },
    { "EPYC" "-" TYPE_X86_CPU, "npt", "off" },
    { "EPYC" "-" TYPE_X86_CPU, "nrip-save", "off" },
    { "EPYC-IBPB" "-" TYPE_X86_CPU, "npt", "off" },
    { "EPYC-IBPB" "-" TYPE_X86_CPU, "nrip-save", "off" },
    { "Skylake-Client" "-" TYPE_X86_CPU,      "mpx", "on" },
    { "Skylake-Client-IBRS" "-" TYPE_X86_CPU, "mpx", "on" },
    { "Skylake-Server" "-" TYPE_X86_CPU,      "mpx", "on" },
    { "Skylake-Server-IBRS" "-" TYPE_X86_CPU, "mpx", "on" },
    { "Cascadelake-Server" "-" TYPE_X86_CPU,  "mpx", "on" },
    { "Icelake-Client" "-" TYPE_X86_CPU,      "mpx", "on" },
    { "Icelake-Server" "-" TYPE_X86_CPU,      "mpx", "on" },
    { "Cascadelake-Server" "-" TYPE_X86_CPU, "stepping", "5" },
    { TYPE_X86_CPU, "x-intel-pt-auto-level", "off" },
};
const size_t pc_compat_3_1_len = G_N_ELEMENTS(pc_compat_3_1);

GlobalProperty pc_compat_3_0[] = {
    { TYPE_X86_CPU, "x-hv-synic-kvm-only", "on" },
    { "Skylake-Server" "-" TYPE_X86_CPU, "pku", "off" },
    { "Skylake-Server-IBRS" "-" TYPE_X86_CPU, "pku", "off" },
};
const size_t pc_compat_3_0_len = G_N_ELEMENTS(pc_compat_3_0);

GlobalProperty pc_compat_2_12[] = {
    { TYPE_X86_CPU, "legacy-cache", "on" },
    { TYPE_X86_CPU, "topoext", "off" },
    { "EPYC-" TYPE_X86_CPU, "xlevel", "0x8000000a" },
    { "EPYC-IBPB-" TYPE_X86_CPU, "xlevel", "0x8000000a" },
};
const size_t pc_compat_2_12_len = G_N_ELEMENTS(pc_compat_2_12);

GlobalProperty pc_compat_2_11[] = {
    { TYPE_X86_CPU, "x-migrate-smi-count", "off" },
    { "Skylake-Server" "-" TYPE_X86_CPU, "clflushopt", "off" },
};
const size_t pc_compat_2_11_len = G_N_ELEMENTS(pc_compat_2_11);

GlobalProperty pc_compat_2_10[] = {
    { TYPE_X86_CPU, "x-hv-max-vps", "0x40" },
    { "i440FX-pcihost", "x-pci-hole64-fix", "off" },
    { "q35-pcihost", "x-pci-hole64-fix", "off" },
};
const size_t pc_compat_2_10_len = G_N_ELEMENTS(pc_compat_2_10);

GlobalProperty pc_compat_2_9[] = {
    { "mch", "extended-tseg-mbytes", "0" },
};
const size_t pc_compat_2_9_len = G_N_ELEMENTS(pc_compat_2_9);

GlobalProperty pc_compat_2_8[] = {
    { TYPE_X86_CPU, "tcg-cpuid", "off" },
    { "kvmclock", "x-mach-use-reliable-get-clock", "off" },
    { "ICH9-LPC", "x-smi-broadcast", "off" },
    { TYPE_X86_CPU, "vmware-cpuid-freq", "off" },
    { "Haswell-" TYPE_X86_CPU, "stepping", "1" },
};
const size_t pc_compat_2_8_len = G_N_ELEMENTS(pc_compat_2_8);

GlobalProperty pc_compat_2_7[] = {
    { TYPE_X86_CPU, "l3-cache", "off" },
    { TYPE_X86_CPU, "full-cpuid-auto-level", "off" },
    { "Opteron_G3" "-" TYPE_X86_CPU, "family", "15" },
    { "Opteron_G3" "-" TYPE_X86_CPU, "model", "6" },
    { "Opteron_G3" "-" TYPE_X86_CPU, "stepping", "1" },
    { "isa-pcspk", "migrate", "off" },
};
const size_t pc_compat_2_7_len = G_N_ELEMENTS(pc_compat_2_7);

GlobalProperty pc_compat_2_6[] = {
    { TYPE_X86_CPU, "cpuid-0xb", "off" },
    { "vmxnet3", "romfile", "" },
    { TYPE_X86_CPU, "fill-mtrr-mask", "off" },
    { "apic-common", "legacy-instance-id", "on", }
};
const size_t pc_compat_2_6_len = G_N_ELEMENTS(pc_compat_2_6);

GlobalProperty pc_compat_2_5[] = {};
const size_t pc_compat_2_5_len = G_N_ELEMENTS(pc_compat_2_5);

GlobalProperty pc_compat_2_4[] = {
    PC_CPU_MODEL_IDS("2.4.0")
    { "Haswell-" TYPE_X86_CPU, "abm", "off" },
    { "Haswell-noTSX-" TYPE_X86_CPU, "abm", "off" },
    { "Broadwell-" TYPE_X86_CPU, "abm", "off" },
    { "Broadwell-noTSX-" TYPE_X86_CPU, "abm", "off" },
    { "host" "-" TYPE_X86_CPU, "host-cache-info", "on" },
    { TYPE_X86_CPU, "check", "off" },
    { "qemu64" "-" TYPE_X86_CPU, "sse4a", "on" },
    { "qemu64" "-" TYPE_X86_CPU, "abm", "on" },
    { "qemu64" "-" TYPE_X86_CPU, "popcnt", "on" },
    { "qemu32" "-" TYPE_X86_CPU, "popcnt", "on" },
    { "Opteron_G2" "-" TYPE_X86_CPU, "rdtscp", "on" },
    { "Opteron_G3" "-" TYPE_X86_CPU, "rdtscp", "on" },
    { "Opteron_G4" "-" TYPE_X86_CPU, "rdtscp", "on" },
    { "Opteron_G5" "-" TYPE_X86_CPU, "rdtscp", "on", }
};
const size_t pc_compat_2_4_len = G_N_ELEMENTS(pc_compat_2_4);

GlobalProperty pc_compat_2_3[] = {
    PC_CPU_MODEL_IDS("2.3.0")
    { TYPE_X86_CPU, "arat", "off" },
    { "qemu64" "-" TYPE_X86_CPU, "min-level", "4" },
    { "kvm64" "-" TYPE_X86_CPU, "min-level", "5" },
    { "pentium3" "-" TYPE_X86_CPU, "min-level", "2" },
    { "n270" "-" TYPE_X86_CPU, "min-level", "5" },
    { "Conroe" "-" TYPE_X86_CPU, "min-level", "4" },
    { "Penryn" "-" TYPE_X86_CPU, "min-level", "4" },
    { "Nehalem" "-" TYPE_X86_CPU, "min-level", "4" },
    { "n270" "-" TYPE_X86_CPU, "min-xlevel", "0x8000000a" },
    { "Penryn" "-" TYPE_X86_CPU, "min-xlevel", "0x8000000a" },
    { "Conroe" "-" TYPE_X86_CPU, "min-xlevel", "0x8000000a" },
    { "Nehalem" "-" TYPE_X86_CPU, "min-xlevel", "0x8000000a" },
    { "Westmere" "-" TYPE_X86_CPU, "min-xlevel", "0x8000000a" },
    { "SandyBridge" "-" TYPE_X86_CPU, "min-xlevel", "0x8000000a" },
    { "IvyBridge" "-" TYPE_X86_CPU, "min-xlevel", "0x8000000a" },
    { "Haswell" "-" TYPE_X86_CPU, "min-xlevel", "0x8000000a" },
    { "Haswell-noTSX" "-" TYPE_X86_CPU, "min-xlevel", "0x8000000a" },
    { "Broadwell" "-" TYPE_X86_CPU, "min-xlevel", "0x8000000a" },
    { "Broadwell-noTSX" "-" TYPE_X86_CPU, "min-xlevel", "0x8000000a" },
    { TYPE_X86_CPU, "kvm-no-smi-migration", "on" },
};
const size_t pc_compat_2_3_len = G_N_ELEMENTS(pc_compat_2_3);

GlobalProperty pc_compat_2_2[] = {
    PC_CPU_MODEL_IDS("2.2.0")
    { "kvm64" "-" TYPE_X86_CPU, "vme", "off" },
    { "kvm32" "-" TYPE_X86_CPU, "vme", "off" },
    { "Conroe" "-" TYPE_X86_CPU, "vme", "off" },
    { "Penryn" "-" TYPE_X86_CPU, "vme", "off" },
    { "Nehalem" "-" TYPE_X86_CPU, "vme", "off" },
    { "Westmere" "-" TYPE_X86_CPU, "vme", "off" },
    { "SandyBridge" "-" TYPE_X86_CPU, "vme", "off" },
    { "Haswell" "-" TYPE_X86_CPU, "vme", "off" },
    { "Broadwell" "-" TYPE_X86_CPU, "vme", "off" },
    { "Opteron_G1" "-" TYPE_X86_CPU, "vme", "off" },
    { "Opteron_G2" "-" TYPE_X86_CPU, "vme", "off" },
    { "Opteron_G3" "-" TYPE_X86_CPU, "vme", "off" },
    { "Opteron_G4" "-" TYPE_X86_CPU, "vme", "off" },
    { "Opteron_G5" "-" TYPE_X86_CPU, "vme", "off" },
    { "Haswell" "-" TYPE_X86_CPU, "f16c", "off" },
    { "Haswell" "-" TYPE_X86_CPU, "rdrand", "off" },
    { "Broadwell" "-" TYPE_X86_CPU, "f16c", "off" },
    { "Broadwell" "-" TYPE_X86_CPU, "rdrand", "off" },
};
const size_t pc_compat_2_2_len = G_N_ELEMENTS(pc_compat_2_2);

GlobalProperty pc_compat_2_1[] = {
    PC_CPU_MODEL_IDS("2.1.0")
    { "coreduo" "-" TYPE_X86_CPU, "vmx", "on" },
    { "core2duo" "-" TYPE_X86_CPU, "vmx", "on" },
};
const size_t pc_compat_2_1_len = G_N_ELEMENTS(pc_compat_2_1);

GlobalProperty pc_compat_2_0[] = {
    PC_CPU_MODEL_IDS("2.0.0")
    { "virtio-scsi-pci", "any_layout", "off" },
    { "PIIX4_PM", "memory-hotplug-support", "off" },
    { "apic", "version", "0x11" },
    { "nec-usb-xhci", "superspeed-ports-first", "off" },
    { "nec-usb-xhci", "force-pcie-endcap", "on" },
    { "pci-serial", "prog_if", "0" },
    { "pci-serial-2x", "prog_if", "0" },
    { "pci-serial-4x", "prog_if", "0" },
    { "virtio-net-pci", "guest_announce", "off" },
    { "ICH9-LPC", "memory-hotplug-support", "off" },
};
const size_t pc_compat_2_0_len = G_N_ELEMENTS(pc_compat_2_0);

GSIState *pc_gsi_create(qemu_irq **irqs, bool pci_enabled)
{
    GSIState *s;

    s = g_new0(GSIState, 1);
    if (kvm_ioapic_in_kernel()) {
        kvm_pc_setup_irq_routing(pci_enabled);
    }
    *irqs = qemu_allocate_irqs(gsi_handler, s, IOAPIC_NUM_PINS);

    return s;
}

static void ioport80_write(void *opaque, hwaddr addr, uint64_t data,
                           unsigned size)
{
}

static uint64_t ioport80_read(void *opaque, hwaddr addr, unsigned size)
{
    return 0xffffffffffffffffULL;
}

/* MS-DOS compatibility mode FPU exception support */
static void ioportF0_write(void *opaque, hwaddr addr, uint64_t data,
                           unsigned size)
{
    if (tcg_enabled()) {
        cpu_set_ignne();
    }
}

static uint64_t ioportF0_read(void *opaque, hwaddr addr, unsigned size)
{
    return 0xffffffffffffffffULL;
}

/* PC cmos mappings */

#define REG_EQUIPMENT_BYTE          0x14

static void cmos_init_hd(MC146818RtcState *s, int type_ofs, int info_ofs,
                         int16_t cylinders, int8_t heads, int8_t sectors)
{
    mc146818rtc_set_cmos_data(s, type_ofs, 47);
    mc146818rtc_set_cmos_data(s, info_ofs, cylinders);
    mc146818rtc_set_cmos_data(s, info_ofs + 1, cylinders >> 8);
    mc146818rtc_set_cmos_data(s, info_ofs + 2, heads);
    mc146818rtc_set_cmos_data(s, info_ofs + 3, 0xff);
    mc146818rtc_set_cmos_data(s, info_ofs + 4, 0xff);
    mc146818rtc_set_cmos_data(s, info_ofs + 5, 0xc0 | ((heads > 8) << 3));
    mc146818rtc_set_cmos_data(s, info_ofs + 6, cylinders);
    mc146818rtc_set_cmos_data(s, info_ofs + 7, cylinders >> 8);
    mc146818rtc_set_cmos_data(s, info_ofs + 8, sectors);
}

/* convert boot_device letter to something recognizable by the bios */
static int boot_device2nibble(char boot_device)
{
    switch(boot_device) {
    case 'a':
    case 'b':
        return 0x01; /* floppy boot */
    case 'c':
        return 0x02; /* hard drive boot */
    case 'd':
        return 0x03; /* CD-ROM boot */
    case 'n':
        return 0x04; /* Network boot */
    }
    return 0;
}

static void set_boot_dev(MC146818RtcState *s, const char *boot_device,
                         Error **errp)
{
#define PC_MAX_BOOT_DEVICES 3
    int nbds, bds[3] = { 0, };
    int i;

    nbds = strlen(boot_device);
    if (nbds > PC_MAX_BOOT_DEVICES) {
        error_setg(errp, "Too many boot devices for PC");
        return;
    }
    for (i = 0; i < nbds; i++) {
        bds[i] = boot_device2nibble(boot_device[i]);
        if (bds[i] == 0) {
            error_setg(errp, "Invalid boot device for PC: '%c'",
                       boot_device[i]);
            return;
        }
    }
    mc146818rtc_set_cmos_data(s, 0x3d, (bds[1] << 4) | bds[0]);
    mc146818rtc_set_cmos_data(s, 0x38, (bds[2] << 4) | (fd_bootchk ? 0x0 : 0x1));
}

static void pc_boot_set(void *opaque, const char *boot_device, Error **errp)
{
    set_boot_dev(opaque, boot_device, errp);
}

static void pc_cmos_init_floppy(MC146818RtcState *rtc_state, ISADevice *floppy)
{
    int val, nb, i;
    FloppyDriveType fd_type[2] = { FLOPPY_DRIVE_TYPE_NONE,
                                   FLOPPY_DRIVE_TYPE_NONE };

    /* floppy type */
    if (floppy) {
        for (i = 0; i < 2; i++) {
            fd_type[i] = isa_fdc_get_drive_type(floppy, i);
        }
    }
    val = (cmos_get_fd_drive_type(fd_type[0]) << 4) |
        cmos_get_fd_drive_type(fd_type[1]);
    mc146818rtc_set_cmos_data(rtc_state, 0x10, val);

    val = mc146818rtc_get_cmos_data(rtc_state, REG_EQUIPMENT_BYTE);
    nb = 0;
    if (fd_type[0] != FLOPPY_DRIVE_TYPE_NONE) {
        nb++;
    }
    if (fd_type[1] != FLOPPY_DRIVE_TYPE_NONE) {
        nb++;
    }
    switch (nb) {
    case 0:
        break;
    case 1:
        val |= 0x01; /* 1 drive, ready for boot */
        break;
    case 2:
        val |= 0x41; /* 2 drives, ready for boot */
        break;
    }
    mc146818rtc_set_cmos_data(rtc_state, REG_EQUIPMENT_BYTE, val);
}

typedef struct pc_cmos_init_late_arg {
    MC146818RtcState *rtc_state;
    BusState *idebus[2];
} pc_cmos_init_late_arg;

typedef struct check_fdc_state {
    ISADevice *floppy;
    bool multiple;
} CheckFdcState;

static int check_fdc(Object *obj, void *opaque)
{
    CheckFdcState *state = opaque;
    Object *fdc;
    uint32_t iobase;
    Error *local_err = NULL;

    fdc = object_dynamic_cast(obj, TYPE_ISA_FDC);
    if (!fdc) {
        return 0;
    }

    iobase = object_property_get_uint(obj, "iobase", &local_err);
    if (local_err || iobase != 0x3f0) {
        error_free(local_err);
        return 0;
    }

    if (state->floppy) {
        state->multiple = true;
    } else {
        state->floppy = ISA_DEVICE(obj);
    }
    return 0;
}

static const char * const fdc_container_path[] = {
    "/unattached", "/peripheral", "/peripheral-anon"
};

/*
 * Locate the FDC at IO address 0x3f0, in order to configure the CMOS registers
 * and ACPI objects.
 */
static ISADevice *pc_find_fdc0(void)
{
    int i;
    Object *container;
    CheckFdcState state = { 0 };

    for (i = 0; i < ARRAY_SIZE(fdc_container_path); i++) {
        container = container_get(qdev_get_machine(), fdc_container_path[i]);
        object_child_foreach(container, check_fdc, &state);
    }

    if (state.multiple) {
        warn_report("multiple floppy disk controllers with "
                    "iobase=0x3f0 have been found");
        error_printf("the one being picked for CMOS setup might not reflect "
                     "your intent");
    }

    return state.floppy;
}

static void pc_cmos_init_late(void *opaque)
{
    pc_cmos_init_late_arg *arg = opaque;
    MC146818RtcState *s = arg->rtc_state;
    int16_t cylinders;
    int8_t heads, sectors;
    int val;
    int i, trans;

    val = 0;
    if (arg->idebus[0] && ide_get_geometry(arg->idebus[0], 0,
                                           &cylinders, &heads, &sectors) >= 0) {
        cmos_init_hd(s, 0x19, 0x1b, cylinders, heads, sectors);
        val |= 0xf0;
    }
    if (arg->idebus[0] && ide_get_geometry(arg->idebus[0], 1,
                                           &cylinders, &heads, &sectors) >= 0) {
        cmos_init_hd(s, 0x1a, 0x24, cylinders, heads, sectors);
        val |= 0x0f;
    }
    mc146818rtc_set_cmos_data(s, 0x12, val);

    val = 0;
    for (i = 0; i < 4; i++) {
        /* NOTE: ide_get_geometry() returns the physical
           geometry.  It is always such that: 1 <= sects <= 63, 1
           <= heads <= 16, 1 <= cylinders <= 16383. The BIOS
           geometry can be different if a translation is done. */
        if (arg->idebus[i / 2] &&
            ide_get_geometry(arg->idebus[i / 2], i % 2,
                             &cylinders, &heads, &sectors) >= 0) {
            trans = ide_get_bios_chs_trans(arg->idebus[i / 2], i % 2) - 1;
            assert((trans & ~3) == 0);
            val |= trans << (i * 2);
        }
    }
    mc146818rtc_set_cmos_data(s, 0x39, val);

    pc_cmos_init_floppy(s, pc_find_fdc0());

    qemu_unregister_reset(pc_cmos_init_late, opaque);
}

void pc_cmos_init(PCMachineState *pcms,
                  BusState *idebus0, BusState *idebus1,
                  ISADevice *rtc)
{
    int val;
    static pc_cmos_init_late_arg arg;
    X86MachineState *x86ms = X86_MACHINE(pcms);
    MC146818RtcState *s = MC146818_RTC(rtc);

    /* various important CMOS locations needed by PC/Bochs bios */

    /* memory size */
    /* base memory (first MiB) */
    val = MIN(x86ms->below_4g_mem_size / KiB, 640);
    mc146818rtc_set_cmos_data(s, 0x15, val);
    mc146818rtc_set_cmos_data(s, 0x16, val >> 8);
    /* extended memory (next 64MiB) */
    if (x86ms->below_4g_mem_size > 1 * MiB) {
        val = (x86ms->below_4g_mem_size - 1 * MiB) / KiB;
    } else {
        val = 0;
    }
    if (val > 65535)
        val = 65535;
    mc146818rtc_set_cmos_data(s, 0x17, val);
    mc146818rtc_set_cmos_data(s, 0x18, val >> 8);
    mc146818rtc_set_cmos_data(s, 0x30, val);
    mc146818rtc_set_cmos_data(s, 0x31, val >> 8);
    /* memory between 16MiB and 4GiB */
    if (x86ms->below_4g_mem_size > 16 * MiB) {
        val = (x86ms->below_4g_mem_size - 16 * MiB) / (64 * KiB);
    } else {
        val = 0;
    }
    if (val > 65535)
        val = 65535;
    mc146818rtc_set_cmos_data(s, 0x34, val);
    mc146818rtc_set_cmos_data(s, 0x35, val >> 8);
    /* memory above 4GiB */
    val = x86ms->above_4g_mem_size / 65536;
    mc146818rtc_set_cmos_data(s, 0x5b, val);
    mc146818rtc_set_cmos_data(s, 0x5c, val >> 8);
    mc146818rtc_set_cmos_data(s, 0x5d, val >> 16);

    object_property_add_link(OBJECT(pcms), "rtc_state",
                             TYPE_ISA_DEVICE,
                             (Object **)&x86ms->rtc,
                             object_property_allow_set_link,
                             OBJ_PROP_LINK_STRONG);
    object_property_set_link(OBJECT(pcms), "rtc_state", OBJECT(s),
                             &error_abort);

    set_boot_dev(s, MACHINE(pcms)->boot_config.order, &error_fatal);

    val = 0;
    val |= 0x02; /* FPU is there */
    val |= 0x04; /* PS/2 mouse installed */
    mc146818rtc_set_cmos_data(s, REG_EQUIPMENT_BYTE, val);

    /* hard drives and FDC */
    arg.rtc_state = s;
    arg.idebus[0] = idebus0;
    arg.idebus[1] = idebus1;
    qemu_register_reset(pc_cmos_init_late, &arg);
}

static void handle_a20_line_change(void *opaque, int irq, int level)
{
    X86CPU *cpu = opaque;

    /* XXX: send to all CPUs ? */
    /* XXX: add logic to handle multiple A20 line sources */
    x86_cpu_set_a20(cpu, level);
}

#define NE2000_NB_MAX 6

static const int ne2000_io[NE2000_NB_MAX] = { 0x300, 0x320, 0x340, 0x360,
                                              0x280, 0x380 };
static const int ne2000_irq[NE2000_NB_MAX] = { 9, 10, 11, 3, 4, 5 };

static gboolean pc_init_ne2k_isa(ISABus *bus, NICInfo *nd, Error **errp)
{
    static int nb_ne2k = 0;

    if (nb_ne2k == NE2000_NB_MAX) {
        error_setg(errp,
                   "maximum number of ISA NE2000 devices exceeded");
        return false;
    }
    isa_ne2000_init(bus, ne2000_io[nb_ne2k],
                    ne2000_irq[nb_ne2k], nd);
    nb_ne2k++;
    return true;
}

void pc_acpi_smi_interrupt(void *opaque, int irq, int level)
{
    X86CPU *cpu = opaque;

    if (level) {
        cpu_interrupt(CPU(cpu), CPU_INTERRUPT_SMI);
    }
}

static
void pc_machine_done(Notifier *notifier, void *data)
{
    PCMachineState *pcms = container_of(notifier,
                                        PCMachineState, machine_done);
    X86MachineState *x86ms = X86_MACHINE(pcms);

    cxl_hook_up_pxb_registers(pcms->bus, &pcms->cxl_devices_state,
                              &error_fatal);

    if (pcms->cxl_devices_state.is_enabled) {
        cxl_fmws_link_targets(&pcms->cxl_devices_state, &error_fatal);
    }

    /* set the number of CPUs */
    x86_rtc_set_cpus_count(x86ms->rtc, x86ms->boot_cpus);

    fw_cfg_add_extra_pci_roots(pcms->bus, x86ms->fw_cfg);

    acpi_setup();
    if (x86ms->fw_cfg) {
        fw_cfg_build_smbios(MACHINE(pcms), x86ms->fw_cfg);
        fw_cfg_build_feature_control(MACHINE(pcms), x86ms->fw_cfg);
        /* update FW_CFG_NB_CPUS to account for -device added CPUs */
        fw_cfg_modify_i16(x86ms->fw_cfg, FW_CFG_NB_CPUS, x86ms->boot_cpus);
    }
}

void pc_guest_info_init(PCMachineState *pcms)
{
    X86MachineState *x86ms = X86_MACHINE(pcms);

    x86ms->apic_xrupt_override = true;
    pcms->machine_done.notify = pc_machine_done;
    qemu_add_machine_init_done_notifier(&pcms->machine_done);
}

/* setup pci memory address space mapping into system address space */
void pc_pci_as_mapping_init(MemoryRegion *system_memory,
                            MemoryRegion *pci_address_space)
{
    /* Set to lower priority than RAM */
    memory_region_add_subregion_overlap(system_memory, 0x0,
                                        pci_address_space, -1);
}

void xen_load_linux(PCMachineState *pcms)
{
    int i;
    FWCfgState *fw_cfg;
    PCMachineClass *pcmc = PC_MACHINE_GET_CLASS(pcms);
    X86MachineState *x86ms = X86_MACHINE(pcms);

    assert(MACHINE(pcms)->kernel_filename != NULL);

    fw_cfg = fw_cfg_init_io(FW_CFG_IO_BASE);
    fw_cfg_add_i16(fw_cfg, FW_CFG_NB_CPUS, x86ms->boot_cpus);
    rom_set_fw(fw_cfg);

    x86_load_linux(x86ms, fw_cfg, pcmc->acpi_data_size,
                   pcmc->pvh_enabled);
    for (i = 0; i < nb_option_roms; i++) {
        assert(!strcmp(option_rom[i].name, "linuxboot.bin") ||
               !strcmp(option_rom[i].name, "linuxboot_dma.bin") ||
               !strcmp(option_rom[i].name, "pvh.bin") ||
               !strcmp(option_rom[i].name, "multiboot.bin") ||
               !strcmp(option_rom[i].name, "multiboot_dma.bin"));
        rom_add_option(option_rom[i].name, option_rom[i].bootindex);
    }
    x86ms->fw_cfg = fw_cfg;
}

#define PC_ROM_MIN_VGA     0xc0000
#define PC_ROM_MIN_OPTION  0xc8000
#define PC_ROM_MAX         0xe0000
#define PC_ROM_ALIGN       0x800
#define PC_ROM_SIZE        (PC_ROM_MAX - PC_ROM_MIN_VGA)

static hwaddr pc_above_4g_end(PCMachineState *pcms)
{
    X86MachineState *x86ms = X86_MACHINE(pcms);

    if (pcms->sgx_epc.size != 0) {
        return sgx_epc_above_4g_end(&pcms->sgx_epc);
    }

    return x86ms->above_4g_mem_start + x86ms->above_4g_mem_size;
}

static void pc_get_device_memory_range(PCMachineState *pcms,
                                       hwaddr *base,
                                       ram_addr_t *device_mem_size)
{
    PCMachineClass *pcmc = PC_MACHINE_GET_CLASS(pcms);
    MachineState *machine = MACHINE(pcms);
    ram_addr_t size;
    hwaddr addr;

    size = machine->maxram_size - machine->ram_size;
    addr = ROUND_UP(pc_above_4g_end(pcms), 1 * GiB);

    if (pcmc->enforce_aligned_dimm) {
        /* size device region assuming 1G page max alignment per slot */
        size += (1 * GiB) * machine->ram_slots;
    }

    *base = addr;
    *device_mem_size = size;
}

static uint64_t pc_get_cxl_range_start(PCMachineState *pcms)
{
    PCMachineClass *pcmc = PC_MACHINE_GET_CLASS(pcms);
    MachineState *ms = MACHINE(pcms);
    hwaddr cxl_base;
    ram_addr_t size;

    if (pcmc->has_reserved_memory &&
        (ms->ram_size < ms->maxram_size)) {
        pc_get_device_memory_range(pcms, &cxl_base, &size);
        cxl_base += size;
    } else {
        cxl_base = pc_above_4g_end(pcms);
    }

    return cxl_base;
}

static uint64_t pc_get_cxl_range_end(PCMachineState *pcms)
{
    uint64_t start = pc_get_cxl_range_start(pcms) + MiB;

    if (pcms->cxl_devices_state.fixed_windows) {
        GList *it;

        start = ROUND_UP(start, 256 * MiB);
        for (it = pcms->cxl_devices_state.fixed_windows; it; it = it->next) {
            CXLFixedWindow *fw = it->data;
            start += fw->size;
        }
    }

    return start;
}

static hwaddr pc_max_used_gpa(PCMachineState *pcms, uint64_t pci_hole64_size)
{
    X86CPU *cpu = X86_CPU(first_cpu);
    PCMachineClass *pcmc = PC_MACHINE_GET_CLASS(pcms);
    MachineState *ms = MACHINE(pcms);

    if (cpu->env.features[FEAT_8000_0001_EDX] & CPUID_EXT2_LM) {
        /* 64-bit systems */
        return pc_pci_hole64_start() + pci_hole64_size - 1;
    }

    /* 32-bit systems */
    if (pcmc->broken_32bit_mem_addr_check) {
        /* old value for compatibility reasons */
        return ((hwaddr)1 << cpu->phys_bits) - 1;
    }

    /*
     * 32-bit systems don't have hole64 but they might have a region for
     * memory devices. Even if additional hotplugged memory devices might
     * not be usable by most guest OSes, we need to still consider them for
     * calculating the highest possible GPA so that we can properly report
     * if someone configures them on a CPU that cannot possibly address them.
     */
    if (pcmc->has_reserved_memory &&
        (ms->ram_size < ms->maxram_size)) {
        hwaddr devmem_start;
        ram_addr_t devmem_size;

        pc_get_device_memory_range(pcms, &devmem_start, &devmem_size);
        devmem_start += devmem_size;
        return devmem_start - 1;
    }

    /* configuration without any memory hotplug */
    return pc_above_4g_end(pcms) - 1;
}

/*
 * AMD systems with an IOMMU have an additional hole close to the
 * 1Tb, which are special GPAs that cannot be DMA mapped. Depending
 * on kernel version, VFIO may or may not let you DMA map those ranges.
 * Starting Linux v5.4 we validate it, and can't create guests on AMD machines
 * with certain memory sizes. It's also wrong to use those IOVA ranges
 * in detriment of leading to IOMMU INVALID_DEVICE_REQUEST or worse.
 * The ranges reserved for Hyper-Transport are:
 *
 * FD_0000_0000h - FF_FFFF_FFFFh
 *
 * The ranges represent the following:
 *
 * Base Address   Top Address  Use
 *
 * FD_0000_0000h FD_F7FF_FFFFh Reserved interrupt address space
 * FD_F800_0000h FD_F8FF_FFFFh Interrupt/EOI IntCtl
 * FD_F900_0000h FD_F90F_FFFFh Legacy PIC IACK
 * FD_F910_0000h FD_F91F_FFFFh System Management
 * FD_F920_0000h FD_FAFF_FFFFh Reserved Page Tables
 * FD_FB00_0000h FD_FBFF_FFFFh Address Translation
 * FD_FC00_0000h FD_FDFF_FFFFh I/O Space
 * FD_FE00_0000h FD_FFFF_FFFFh Configuration
 * FE_0000_0000h FE_1FFF_FFFFh Extended Configuration/Device Messages
 * FE_2000_0000h FF_FFFF_FFFFh Reserved
 *
 * See AMD IOMMU spec, section 2.1.2 "IOMMU Logical Topology",
 * Table 3: Special Address Controls (GPA) for more information.
 */
#define AMD_HT_START         0xfd00000000UL
#define AMD_HT_END           0xffffffffffUL
#define AMD_ABOVE_1TB_START  (AMD_HT_END + 1)
#define AMD_HT_SIZE          (AMD_ABOVE_1TB_START - AMD_HT_START)

void pc_memory_init(PCMachineState *pcms,
                    MemoryRegion *system_memory,
                    MemoryRegion *rom_memory,
                    uint64_t pci_hole64_size)
{
    int linux_boot, i;
    MemoryRegion *option_rom_mr;
    MemoryRegion *ram_below_4g, *ram_above_4g;
    FWCfgState *fw_cfg;
    MachineState *machine = MACHINE(pcms);
    MachineClass *mc = MACHINE_GET_CLASS(machine);
    PCMachineClass *pcmc = PC_MACHINE_GET_CLASS(pcms);
    X86MachineState *x86ms = X86_MACHINE(pcms);
    hwaddr maxphysaddr, maxusedaddr;
    hwaddr cxl_base, cxl_resv_end = 0;
    X86CPU *cpu = X86_CPU(first_cpu);

    assert(machine->ram_size == x86ms->below_4g_mem_size +
                                x86ms->above_4g_mem_size);

    linux_boot = (machine->kernel_filename != NULL);

    /*
     * The HyperTransport range close to the 1T boundary is unique to AMD
     * hosts with IOMMUs enabled. Restrict the ram-above-4g relocation
     * to above 1T to AMD vCPUs only. @enforce_amd_1tb_hole is only false in
     * older machine types (<= 7.0) for compatibility purposes.
     */
    if (IS_AMD_CPU(&cpu->env) && pcmc->enforce_amd_1tb_hole) {
        /* Bail out if max possible address does not cross HT range */
        if (pc_max_used_gpa(pcms, pci_hole64_size) >= AMD_HT_START) {
            x86ms->above_4g_mem_start = AMD_ABOVE_1TB_START;
        }

        /*
         * Advertise the HT region if address space covers the reserved
         * region or if we relocate.
         */
        if (cpu->phys_bits >= 40) {
            e820_add_entry(AMD_HT_START, AMD_HT_SIZE, E820_RESERVED);
        }
    }

    /*
     * phys-bits is required to be appropriately configured
     * to make sure max used GPA is reachable.
     */
    maxusedaddr = pc_max_used_gpa(pcms, pci_hole64_size);
    maxphysaddr = ((hwaddr)1 << cpu->phys_bits) - 1;
    if (maxphysaddr < maxusedaddr) {
        error_report("Address space limit 0x%"PRIx64" < 0x%"PRIx64
                     " phys-bits too low (%u)",
                     maxphysaddr, maxusedaddr, cpu->phys_bits);
        exit(EXIT_FAILURE);
    }

    /*
     * Split single memory region and use aliases to address portions of it,
     * done for backwards compatibility with older qemus.
     */
    ram_below_4g = g_malloc(sizeof(*ram_below_4g));
    memory_region_init_alias(ram_below_4g, NULL, "ram-below-4g", machine->ram,
                             0, x86ms->below_4g_mem_size);
    memory_region_add_subregion(system_memory, 0, ram_below_4g);
    e820_add_entry(0, x86ms->below_4g_mem_size, E820_RAM);
    if (x86ms->above_4g_mem_size > 0) {
        ram_above_4g = g_malloc(sizeof(*ram_above_4g));
        memory_region_init_alias(ram_above_4g, NULL, "ram-above-4g",
                                 machine->ram,
                                 x86ms->below_4g_mem_size,
                                 x86ms->above_4g_mem_size);
        memory_region_add_subregion(system_memory, x86ms->above_4g_mem_start,
                                    ram_above_4g);
        e820_add_entry(x86ms->above_4g_mem_start, x86ms->above_4g_mem_size,
                       E820_RAM);
    }

    if (pcms->sgx_epc.size != 0) {
        e820_add_entry(pcms->sgx_epc.base, pcms->sgx_epc.size, E820_RESERVED);
    }

    if (!pcmc->has_reserved_memory &&
        (machine->ram_slots ||
         (machine->maxram_size > machine->ram_size))) {

        error_report("\"-memory 'slots|maxmem'\" is not supported by: %s",
                     mc->name);
        exit(EXIT_FAILURE);
    }

    /* initialize device memory address space */
    if (pcmc->has_reserved_memory &&
        (machine->ram_size < machine->maxram_size)) {
        ram_addr_t device_mem_size;
        hwaddr device_mem_base;

        if (machine->ram_slots > ACPI_MAX_RAM_SLOTS) {
            error_report("unsupported amount of memory slots: %"PRIu64,
                         machine->ram_slots);
            exit(EXIT_FAILURE);
        }

        if (QEMU_ALIGN_UP(machine->maxram_size,
                          TARGET_PAGE_SIZE) != machine->maxram_size) {
            error_report("maximum memory size must by aligned to multiple of "
                         "%d bytes", TARGET_PAGE_SIZE);
            exit(EXIT_FAILURE);
        }

        pc_get_device_memory_range(pcms, &device_mem_base, &device_mem_size);

        if (device_mem_base + device_mem_size < device_mem_size) {
            error_report("unsupported amount of maximum memory: " RAM_ADDR_FMT,
                         machine->maxram_size);
            exit(EXIT_FAILURE);
        }
        machine_memory_devices_init(machine, device_mem_base, device_mem_size);
    }

    if (pcms->cxl_devices_state.is_enabled) {
        MemoryRegion *mr = &pcms->cxl_devices_state.host_mr;
        hwaddr cxl_size = MiB;

        cxl_base = pc_get_cxl_range_start(pcms);
        memory_region_init(mr, OBJECT(machine), "cxl_host_reg", cxl_size);
        memory_region_add_subregion(system_memory, cxl_base, mr);
        cxl_resv_end = cxl_base + cxl_size;
        if (pcms->cxl_devices_state.fixed_windows) {
            hwaddr cxl_fmw_base;
            GList *it;

            cxl_fmw_base = ROUND_UP(cxl_base + cxl_size, 256 * MiB);
            for (it = pcms->cxl_devices_state.fixed_windows; it; it = it->next) {
                CXLFixedWindow *fw = it->data;

                fw->base = cxl_fmw_base;
                memory_region_init_io(&fw->mr, OBJECT(machine), &cfmws_ops, fw,
                                      "cxl-fixed-memory-region", fw->size);
                memory_region_add_subregion(system_memory, fw->base, &fw->mr);
                cxl_fmw_base += fw->size;
                cxl_resv_end = cxl_fmw_base;
            }
        }
    }

    /* Initialize PC system firmware */
    pc_system_firmware_init(pcms, rom_memory);

    option_rom_mr = g_malloc(sizeof(*option_rom_mr));
    memory_region_init_ram(option_rom_mr, NULL, "pc.rom", PC_ROM_SIZE,
                           &error_fatal);
    if (pcmc->pci_enabled) {
        memory_region_set_readonly(option_rom_mr, true);
    }
    memory_region_add_subregion_overlap(rom_memory,
                                        PC_ROM_MIN_VGA,
                                        option_rom_mr,
                                        1);

    fw_cfg = fw_cfg_arch_create(machine,
                                x86ms->boot_cpus, x86ms->apic_id_limit);

    rom_set_fw(fw_cfg);

    if (machine->device_memory) {
        uint64_t *val = g_malloc(sizeof(*val));
        uint64_t res_mem_end = machine->device_memory->base;

        if (!pcmc->broken_reserved_end) {
            res_mem_end += memory_region_size(&machine->device_memory->mr);
        }

        if (pcms->cxl_devices_state.is_enabled) {
            res_mem_end = cxl_resv_end;
        }
        *val = cpu_to_le64(ROUND_UP(res_mem_end, 1 * GiB));
        fw_cfg_add_file(fw_cfg, "etc/reserved-memory-end", val, sizeof(*val));
    }

    if (linux_boot) {
        x86_load_linux(x86ms, fw_cfg, pcmc->acpi_data_size,
                       pcmc->pvh_enabled);
    }

    for (i = 0; i < nb_option_roms; i++) {
        rom_add_option(option_rom[i].name, option_rom[i].bootindex);
    }
    x86ms->fw_cfg = fw_cfg;

    /* Init default IOAPIC address space */
    x86ms->ioapic_as = &address_space_memory;

    /* Init ACPI memory hotplug IO base address */
    pcms->memhp_io_base = ACPI_MEMORY_HOTPLUG_BASE;
}

/*
 * The 64bit pci hole starts after "above 4G RAM" and
 * potentially the space reserved for memory hotplug.
 */
uint64_t pc_pci_hole64_start(void)
{
    PCMachineState *pcms = PC_MACHINE(qdev_get_machine());
    PCMachineClass *pcmc = PC_MACHINE_GET_CLASS(pcms);
    MachineState *ms = MACHINE(pcms);
    uint64_t hole64_start = 0;
    ram_addr_t size = 0;

    if (pcms->cxl_devices_state.is_enabled) {
        hole64_start = pc_get_cxl_range_end(pcms);
    } else if (pcmc->has_reserved_memory && (ms->ram_size < ms->maxram_size)) {
        pc_get_device_memory_range(pcms, &hole64_start, &size);
        if (!pcmc->broken_reserved_end) {
            hole64_start += size;
        }
    } else {
        hole64_start = pc_above_4g_end(pcms);
    }

    return ROUND_UP(hole64_start, 1 * GiB);
}

DeviceState *pc_vga_init(ISABus *isa_bus, PCIBus *pci_bus)
{
    DeviceState *dev = NULL;

    rom_set_order_override(FW_CFG_ORDER_OVERRIDE_VGA);
    if (pci_bus) {
        PCIDevice *pcidev = pci_vga_init(pci_bus);
        dev = pcidev ? &pcidev->qdev : NULL;
    } else if (isa_bus) {
        ISADevice *isadev = isa_vga_init(isa_bus);
        dev = isadev ? DEVICE(isadev) : NULL;
    }
    rom_reset_order_override();
    return dev;
}

static const MemoryRegionOps ioport80_io_ops = {
    .write = ioport80_write,
    .read = ioport80_read,
    .endianness = DEVICE_NATIVE_ENDIAN,
    .impl = {
        .min_access_size = 1,
        .max_access_size = 1,
    },
};

static const MemoryRegionOps ioportF0_io_ops = {
    .write = ioportF0_write,
    .read = ioportF0_read,
    .endianness = DEVICE_NATIVE_ENDIAN,
    .impl = {
        .min_access_size = 1,
        .max_access_size = 1,
    },
};

static void pc_superio_init(ISABus *isa_bus, bool create_fdctrl,
                            bool create_i8042, bool no_vmport)
{
    int i;
    DriveInfo *fd[MAX_FD];
    qemu_irq *a20_line;
    ISADevice *fdc, *i8042, *port92, *vmmouse;

    serial_hds_isa_init(isa_bus, 0, MAX_ISA_SERIAL_PORTS);
    parallel_hds_isa_init(isa_bus, MAX_PARALLEL_PORTS);

    for (i = 0; i < MAX_FD; i++) {
        fd[i] = drive_get(IF_FLOPPY, 0, i);
        create_fdctrl |= !!fd[i];
    }
    if (create_fdctrl) {
        fdc = isa_new(TYPE_ISA_FDC);
        if (fdc) {
            isa_realize_and_unref(fdc, isa_bus, &error_fatal);
            isa_fdc_init_drives(fdc, fd);
        }
    }

    if (!create_i8042) {
        return;
    }

    i8042 = isa_create_simple(isa_bus, TYPE_I8042);
    if (!no_vmport) {
        isa_create_simple(isa_bus, TYPE_VMPORT);
        vmmouse = isa_try_new("vmmouse");
    } else {
        vmmouse = NULL;
    }
    if (vmmouse) {
        object_property_set_link(OBJECT(vmmouse), TYPE_I8042, OBJECT(i8042),
                                 &error_abort);
        isa_realize_and_unref(vmmouse, isa_bus, &error_fatal);
    }
    port92 = isa_create_simple(isa_bus, TYPE_PORT92);

    a20_line = qemu_allocate_irqs(handle_a20_line_change, first_cpu, 2);
    i8042_setup_a20_line(i8042, a20_line[0]);
    qdev_connect_gpio_out_named(DEVICE(port92),
                                PORT92_A20_LINE, 0, a20_line[1]);
    g_free(a20_line);
}

void pc_basic_device_init(struct PCMachineState *pcms,
                          ISABus *isa_bus, qemu_irq *gsi,
                          ISADevice *rtc_state,
                          bool create_fdctrl,
                          uint32_t hpet_irqs)
{
    int i;
    DeviceState *hpet = NULL;
    int pit_isa_irq = 0;
    qemu_irq pit_alt_irq = NULL;
    ISADevice *pit = NULL;
    MemoryRegion *ioport80_io = g_new(MemoryRegion, 1);
    MemoryRegion *ioportF0_io = g_new(MemoryRegion, 1);
    X86MachineState *x86ms = X86_MACHINE(pcms);

    memory_region_init_io(ioport80_io, NULL, &ioport80_io_ops, NULL, "ioport80", 1);
    memory_region_add_subregion(isa_bus->address_space_io, 0x80, ioport80_io);

    memory_region_init_io(ioportF0_io, NULL, &ioportF0_io_ops, NULL, "ioportF0", 1);
    memory_region_add_subregion(isa_bus->address_space_io, 0xf0, ioportF0_io);

    /*
     * Check if an HPET shall be created.
     */
    if (pcms->hpet_enabled) {
        qemu_irq rtc_irq;

        hpet = qdev_try_new(TYPE_HPET);
        if (!hpet) {
            error_report("couldn't create HPET device");
            exit(1);
        }
        /*
         * For pc-piix-*, hpet's intcap is always IRQ2. For pc-q35-*,
         * use IRQ16~23, IRQ8 and IRQ2.  If the user has already set
         * the property, use whatever mask they specified.
         */
        uint8_t compat = object_property_get_uint(OBJECT(hpet),
                HPET_INTCAP, NULL);
        if (!compat) {
            qdev_prop_set_uint32(hpet, HPET_INTCAP, hpet_irqs);
        }
        sysbus_realize_and_unref(SYS_BUS_DEVICE(hpet), &error_fatal);
        sysbus_mmio_map(SYS_BUS_DEVICE(hpet), 0, HPET_BASE);

        for (i = 0; i < IOAPIC_NUM_PINS; i++) {
            sysbus_connect_irq(SYS_BUS_DEVICE(hpet), i, gsi[i]);
        }
        pit_isa_irq = -1;
        pit_alt_irq = qdev_get_gpio_in(hpet, HPET_LEGACY_PIT_INT);
        rtc_irq = qdev_get_gpio_in(hpet, HPET_LEGACY_RTC_INT);

        /* overwrite connection created by south bridge */
        qdev_connect_gpio_out(DEVICE(rtc_state), 0, rtc_irq);
    }

    object_property_add_alias(OBJECT(pcms), "rtc-time", OBJECT(rtc_state),
                              "date");

#ifdef CONFIG_XEN_EMU
    if (xen_mode == XEN_EMULATE) {
        xen_overlay_create();
        xen_evtchn_create(IOAPIC_NUM_PINS, gsi);
        xen_gnttab_create();
        xen_xenstore_create();
        if (pcms->bus) {
            pci_create_simple(pcms->bus, -1, "xen-platform");
        }
        xen_bus_init();
        xen_be_init();
    }
#endif

    qemu_register_boot_set(pc_boot_set, rtc_state);

    if (!xen_enabled() &&
        (x86ms->pit == ON_OFF_AUTO_AUTO || x86ms->pit == ON_OFF_AUTO_ON)) {
        if (kvm_pit_in_kernel()) {
            pit = kvm_pit_init(isa_bus, 0x40);
        } else {
            pit = i8254_pit_init(isa_bus, 0x40, pit_isa_irq, pit_alt_irq);
        }
        if (hpet) {
            /* connect PIT to output control line of the HPET */
            qdev_connect_gpio_out(hpet, 0, qdev_get_gpio_in(DEVICE(pit), 0));
        }
        object_property_set_link(OBJECT(pcms->pcspk), "pit",
                                 OBJECT(pit), &error_fatal);
        isa_realize_and_unref(pcms->pcspk, isa_bus, &error_fatal);
    }

    /* Super I/O */
    pc_superio_init(isa_bus, create_fdctrl, pcms->i8042_enabled,
                    pcms->vmport != ON_OFF_AUTO_ON);
}

void pc_nic_init(PCMachineClass *pcmc, ISABus *isa_bus, PCIBus *pci_bus)
{
    MachineClass *mc = MACHINE_CLASS(pcmc);
    bool default_is_ne2k = g_str_equal(mc->default_nic, TYPE_ISA_NE2000);
    NICInfo *nd;

    rom_set_order_override(FW_CFG_ORDER_OVERRIDE_NIC);

    while ((nd = qemu_find_nic_info(TYPE_ISA_NE2000, default_is_ne2k, NULL))) {
        pc_init_ne2k_isa(isa_bus, nd, &error_fatal);
    }

    /* Anything remaining should be a PCI NIC */
    pci_init_nic_devices(pci_bus, mc->default_nic);

    rom_reset_order_override();
}

void pc_i8259_create(ISABus *isa_bus, qemu_irq *i8259_irqs)
{
    qemu_irq *i8259;

    if (kvm_pic_in_kernel()) {
        i8259 = kvm_i8259_init(isa_bus);
    } else if (xen_enabled()) {
        i8259 = xen_interrupt_controller_init();
    } else {
        i8259 = i8259_init(isa_bus, x86_allocate_cpu_irq());
    }

    for (size_t i = 0; i < ISA_NUM_IRQS; i++) {
        i8259_irqs[i] = i8259[i];
    }

    g_free(i8259);
}

static void pc_memory_pre_plug(HotplugHandler *hotplug_dev, DeviceState *dev,
                               Error **errp)
{
    const PCMachineState *pcms = PC_MACHINE(hotplug_dev);
    const X86MachineState *x86ms = X86_MACHINE(hotplug_dev);
    const PCMachineClass *pcmc = PC_MACHINE_GET_CLASS(pcms);
    const MachineState *ms = MACHINE(hotplug_dev);
    const bool is_nvdimm = object_dynamic_cast(OBJECT(dev), TYPE_NVDIMM);
    const uint64_t legacy_align = TARGET_PAGE_SIZE;
    Error *local_err = NULL;

    /*
     * When "acpi=off" is used with the Q35 machine type, no ACPI is built,
     * but pcms->acpi_dev is still created. Check !acpi_enabled in
     * addition to cover this case.
     */
    if (!x86ms->acpi_dev || !x86_machine_is_acpi_enabled(x86ms)) {
        error_setg(errp,
                   "memory hotplug is not enabled: missing acpi device or acpi disabled");
        return;
    }

    if (is_nvdimm && !ms->nvdimms_state->is_enabled) {
        error_setg(errp, "nvdimm is not enabled: missing 'nvdimm' in '-M'");
        return;
    }

    hotplug_handler_pre_plug(x86ms->acpi_dev, dev, &local_err);
    if (local_err) {
        error_propagate(errp, local_err);
        return;
    }

    pc_dimm_pre_plug(PC_DIMM(dev), MACHINE(hotplug_dev),
                     pcmc->enforce_aligned_dimm ? NULL : &legacy_align, errp);
}

static void pc_memory_plug(HotplugHandler *hotplug_dev,
                           DeviceState *dev, Error **errp)
{
    PCMachineState *pcms = PC_MACHINE(hotplug_dev);
    X86MachineState *x86ms = X86_MACHINE(hotplug_dev);
    MachineState *ms = MACHINE(hotplug_dev);
    bool is_nvdimm = object_dynamic_cast(OBJECT(dev), TYPE_NVDIMM);

    pc_dimm_plug(PC_DIMM(dev), MACHINE(pcms));

    if (is_nvdimm) {
        nvdimm_plug(ms->nvdimms_state);
    }

    hotplug_handler_plug(x86ms->acpi_dev, dev, &error_abort);
}

static void pc_memory_unplug_request(HotplugHandler *hotplug_dev,
                                     DeviceState *dev, Error **errp)
{
    X86MachineState *x86ms = X86_MACHINE(hotplug_dev);

    /*
     * When "acpi=off" is used with the Q35 machine type, no ACPI is built,
     * but pcms->acpi_dev is still created. Check !acpi_enabled in
     * addition to cover this case.
     */
    if (!x86ms->acpi_dev || !x86_machine_is_acpi_enabled(x86ms)) {
        error_setg(errp,
                   "memory hotplug is not enabled: missing acpi device or acpi disabled");
        return;
    }

    if (object_dynamic_cast(OBJECT(dev), TYPE_NVDIMM)) {
        error_setg(errp, "nvdimm device hot unplug is not supported yet.");
        return;
    }

    hotplug_handler_unplug_request(x86ms->acpi_dev, dev,
                                   errp);
}

static void pc_memory_unplug(HotplugHandler *hotplug_dev,
                             DeviceState *dev, Error **errp)
{
    PCMachineState *pcms = PC_MACHINE(hotplug_dev);
    X86MachineState *x86ms = X86_MACHINE(hotplug_dev);
    Error *local_err = NULL;

    hotplug_handler_unplug(x86ms->acpi_dev, dev, &local_err);
    if (local_err) {
        goto out;
    }

    pc_dimm_unplug(PC_DIMM(dev), MACHINE(pcms));
    qdev_unrealize(dev);
 out:
    error_propagate(errp, local_err);
}

static void pc_hv_balloon_pre_plug(HotplugHandler *hotplug_dev,
                                   DeviceState *dev, Error **errp)
{
    /* The vmbus handler has no hotplug handler; we should never end up here. */
    g_assert(!dev->hotplugged);
    memory_device_pre_plug(MEMORY_DEVICE(dev), MACHINE(hotplug_dev), NULL,
                           errp);
}

static void pc_hv_balloon_plug(HotplugHandler *hotplug_dev,
                               DeviceState *dev, Error **errp)
{
    memory_device_plug(MEMORY_DEVICE(dev), MACHINE(hotplug_dev));
}

static void pc_machine_device_pre_plug_cb(HotplugHandler *hotplug_dev,
                                          DeviceState *dev, Error **errp)
{
    if (object_dynamic_cast(OBJECT(dev), TYPE_PC_DIMM)) {
        pc_memory_pre_plug(hotplug_dev, dev, errp);
    } else if (object_dynamic_cast(OBJECT(dev), TYPE_CPU)) {
        x86_cpu_pre_plug(hotplug_dev, dev, errp);
    } else if (object_dynamic_cast(OBJECT(dev), TYPE_VIRTIO_MD_PCI)) {
        virtio_md_pci_pre_plug(VIRTIO_MD_PCI(dev), MACHINE(hotplug_dev), errp);
    } else if (object_dynamic_cast(OBJECT(dev), TYPE_VIRTIO_IOMMU_PCI)) {
        /* Declare the APIC range as the reserved MSI region */
        char *resv_prop_str = g_strdup_printf("0xfee00000:0xfeefffff:%d",
                                              VIRTIO_IOMMU_RESV_MEM_T_MSI);
        QList *reserved_regions = qlist_new();

        qlist_append_str(reserved_regions, resv_prop_str);
        qdev_prop_set_array(dev, "reserved-regions", reserved_regions);

        g_free(resv_prop_str);
    }

    if (object_dynamic_cast(OBJECT(dev), TYPE_X86_IOMMU_DEVICE) ||
        object_dynamic_cast(OBJECT(dev), TYPE_VIRTIO_IOMMU_PCI)) {
        PCMachineState *pcms = PC_MACHINE(hotplug_dev);

        if (pcms->iommu) {
            error_setg(errp, "QEMU does not support multiple vIOMMUs "
                       "for x86 yet.");
            return;
        }
        pcms->iommu = dev;
    } else if (object_dynamic_cast(OBJECT(dev), TYPE_HV_BALLOON)) {
        pc_hv_balloon_pre_plug(hotplug_dev, dev, errp);
    }
}

static void pc_machine_device_plug_cb(HotplugHandler *hotplug_dev,
                                      DeviceState *dev, Error **errp)
{
    if (object_dynamic_cast(OBJECT(dev), TYPE_PC_DIMM)) {
        pc_memory_plug(hotplug_dev, dev, errp);
    } else if (object_dynamic_cast(OBJECT(dev), TYPE_CPU)) {
        x86_cpu_plug(hotplug_dev, dev, errp);
    } else if (object_dynamic_cast(OBJECT(dev), TYPE_VIRTIO_MD_PCI)) {
        virtio_md_pci_plug(VIRTIO_MD_PCI(dev), MACHINE(hotplug_dev), errp);
    } else if (object_dynamic_cast(OBJECT(dev), TYPE_HV_BALLOON)) {
        pc_hv_balloon_plug(hotplug_dev, dev, errp);
    }
}

static void pc_machine_device_unplug_request_cb(HotplugHandler *hotplug_dev,
                                                DeviceState *dev, Error **errp)
{
    if (object_dynamic_cast(OBJECT(dev), TYPE_PC_DIMM)) {
        pc_memory_unplug_request(hotplug_dev, dev, errp);
    } else if (object_dynamic_cast(OBJECT(dev), TYPE_CPU)) {
        x86_cpu_unplug_request_cb(hotplug_dev, dev, errp);
    } else if (object_dynamic_cast(OBJECT(dev), TYPE_VIRTIO_MD_PCI)) {
        virtio_md_pci_unplug_request(VIRTIO_MD_PCI(dev), MACHINE(hotplug_dev),
                                     errp);
    } else {
        error_setg(errp, "acpi: device unplug request for not supported device"
                   " type: %s", object_get_typename(OBJECT(dev)));
    }
}

static void pc_machine_device_unplug_cb(HotplugHandler *hotplug_dev,
                                        DeviceState *dev, Error **errp)
{
    if (object_dynamic_cast(OBJECT(dev), TYPE_PC_DIMM)) {
        pc_memory_unplug(hotplug_dev, dev, errp);
    } else if (object_dynamic_cast(OBJECT(dev), TYPE_CPU)) {
        x86_cpu_unplug_cb(hotplug_dev, dev, errp);
    } else if (object_dynamic_cast(OBJECT(dev), TYPE_VIRTIO_MD_PCI)) {
        virtio_md_pci_unplug(VIRTIO_MD_PCI(dev), MACHINE(hotplug_dev), errp);
    } else {
        error_setg(errp, "acpi: device unplug for not supported device"
                   " type: %s", object_get_typename(OBJECT(dev)));
    }
}

static HotplugHandler *pc_get_hotplug_handler(MachineState *machine,
                                             DeviceState *dev)
{
    if (object_dynamic_cast(OBJECT(dev), TYPE_PC_DIMM) ||
        object_dynamic_cast(OBJECT(dev), TYPE_CPU) ||
        object_dynamic_cast(OBJECT(dev), TYPE_VIRTIO_MD_PCI) ||
        object_dynamic_cast(OBJECT(dev), TYPE_VIRTIO_IOMMU_PCI) ||
        object_dynamic_cast(OBJECT(dev), TYPE_HV_BALLOON) ||
        object_dynamic_cast(OBJECT(dev), TYPE_X86_IOMMU_DEVICE)) {
        return HOTPLUG_HANDLER(machine);
    }

    return NULL;
}

static void pc_machine_get_vmport(Object *obj, Visitor *v, const char *name,
                                  void *opaque, Error **errp)
{
    PCMachineState *pcms = PC_MACHINE(obj);
    OnOffAuto vmport = pcms->vmport;

    visit_type_OnOffAuto(v, name, &vmport, errp);
}

static void pc_machine_set_vmport(Object *obj, Visitor *v, const char *name,
                                  void *opaque, Error **errp)
{
    PCMachineState *pcms = PC_MACHINE(obj);

    visit_type_OnOffAuto(v, name, &pcms->vmport, errp);
}

static bool pc_machine_get_smbus(Object *obj, Error **errp)
{
    PCMachineState *pcms = PC_MACHINE(obj);

    return pcms->smbus_enabled;
}

static void pc_machine_set_smbus(Object *obj, bool value, Error **errp)
{
    PCMachineState *pcms = PC_MACHINE(obj);

    pcms->smbus_enabled = value;
}

static bool pc_machine_get_sata(Object *obj, Error **errp)
{
    PCMachineState *pcms = PC_MACHINE(obj);

    return pcms->sata_enabled;
}

static void pc_machine_set_sata(Object *obj, bool value, Error **errp)
{
    PCMachineState *pcms = PC_MACHINE(obj);

    pcms->sata_enabled = value;
}

static bool pc_machine_get_hpet(Object *obj, Error **errp)
{
    PCMachineState *pcms = PC_MACHINE(obj);

    return pcms->hpet_enabled;
}

static void pc_machine_set_hpet(Object *obj, bool value, Error **errp)
{
    PCMachineState *pcms = PC_MACHINE(obj);

    pcms->hpet_enabled = value;
}

static bool pc_machine_get_i8042(Object *obj, Error **errp)
{
    PCMachineState *pcms = PC_MACHINE(obj);

    return pcms->i8042_enabled;
}

static void pc_machine_set_i8042(Object *obj, bool value, Error **errp)
{
    PCMachineState *pcms = PC_MACHINE(obj);

    pcms->i8042_enabled = value;
}

static bool pc_machine_get_default_bus_bypass_iommu(Object *obj, Error **errp)
{
    PCMachineState *pcms = PC_MACHINE(obj);

    return pcms->default_bus_bypass_iommu;
}

static void pc_machine_set_default_bus_bypass_iommu(Object *obj, bool value,
                                                    Error **errp)
{
    PCMachineState *pcms = PC_MACHINE(obj);

    pcms->default_bus_bypass_iommu = value;
}

static void pc_machine_get_smbios_ep(Object *obj, Visitor *v, const char *name,
                                     void *opaque, Error **errp)
{
    PCMachineState *pcms = PC_MACHINE(obj);
    SmbiosEntryPointType smbios_entry_point_type = pcms->smbios_entry_point_type;

    visit_type_SmbiosEntryPointType(v, name, &smbios_entry_point_type, errp);
}

static void pc_machine_set_smbios_ep(Object *obj, Visitor *v, const char *name,
                                     void *opaque, Error **errp)
{
    PCMachineState *pcms = PC_MACHINE(obj);

    visit_type_SmbiosEntryPointType(v, name, &pcms->smbios_entry_point_type, errp);
}

static void pc_machine_get_max_ram_below_4g(Object *obj, Visitor *v,
                                            const char *name, void *opaque,
                                            Error **errp)
{
    PCMachineState *pcms = PC_MACHINE(obj);
    uint64_t value = pcms->max_ram_below_4g;

    visit_type_size(v, name, &value, errp);
}

static void pc_machine_set_max_ram_below_4g(Object *obj, Visitor *v,
                                            const char *name, void *opaque,
                                            Error **errp)
{
    PCMachineState *pcms = PC_MACHINE(obj);
    uint64_t value;

    if (!visit_type_size(v, name, &value, errp)) {
        return;
    }
    if (value > 4 * GiB) {
        error_setg(errp,
                   "Machine option 'max-ram-below-4g=%"PRIu64
                   "' expects size less than or equal to 4G", value);
        return;
    }

    if (value < 1 * MiB) {
        warn_report("Only %" PRIu64 " bytes of RAM below the 4GiB boundary,"
                    "BIOS may not work with less than 1MiB", value);
    }

    pcms->max_ram_below_4g = value;
}

static void pc_machine_get_max_fw_size(Object *obj, Visitor *v,
                                       const char *name, void *opaque,
                                       Error **errp)
{
    PCMachineState *pcms = PC_MACHINE(obj);
    uint64_t value = pcms->max_fw_size;

    visit_type_size(v, name, &value, errp);
}

static void pc_machine_set_max_fw_size(Object *obj, Visitor *v,
                                       const char *name, void *opaque,
                                       Error **errp)
{
    PCMachineState *pcms = PC_MACHINE(obj);
    uint64_t value;

    if (!visit_type_size(v, name, &value, errp)) {
        return;
    }

    /*
     * We don't have a theoretically justifiable exact lower bound on the base
     * address of any flash mapping. In practice, the IO-APIC MMIO range is
     * [0xFEE00000..0xFEE01000] -- see IO_APIC_DEFAULT_ADDRESS --, leaving free
     * only 18MiB-4KiB below 4GiB. For now, restrict the cumulative mapping to
     * 16MiB in size.
     */
    if (value > 16 * MiB) {
        error_setg(errp,
                   "User specified max allowed firmware size %" PRIu64 " is "
                   "greater than 16MiB. If combined firmware size exceeds "
                   "16MiB the system may not boot, or experience intermittent"
                   "stability issues.",
                   value);
        return;
    }

    pcms->max_fw_size = value;
}


static void pc_machine_initfn(Object *obj)
{
    PCMachineState *pcms = PC_MACHINE(obj);
    PCMachineClass *pcmc = PC_MACHINE_GET_CLASS(pcms);

#ifdef CONFIG_VMPORT
    pcms->vmport = ON_OFF_AUTO_AUTO;
#else
    pcms->vmport = ON_OFF_AUTO_OFF;
#endif /* CONFIG_VMPORT */
    pcms->max_ram_below_4g = 0; /* use default */
    pcms->smbios_entry_point_type = pcmc->default_smbios_ep_type;
    pcms->south_bridge = pcmc->default_south_bridge;

    /* acpi build is enabled by default if machine supports it */
    pcms->acpi_build_enabled = pcmc->has_acpi_build;
    pcms->smbus_enabled = true;
    pcms->sata_enabled = true;
    pcms->i8042_enabled = true;
    pcms->max_fw_size = 8 * MiB;
#ifdef CONFIG_HPET
    pcms->hpet_enabled = true;
#endif
    pcms->default_bus_bypass_iommu = false;

    pc_system_flash_create(pcms);
    pcms->pcspk = isa_new(TYPE_PC_SPEAKER);
    object_property_add_alias(OBJECT(pcms), "pcspk-audiodev",
                              OBJECT(pcms->pcspk), "audiodev");
    cxl_machine_init(obj, &pcms->cxl_devices_state);
}

int pc_machine_kvm_type(MachineState *machine, const char *kvm_type)
{
    return 0;
}

static void pc_machine_reset(MachineState *machine, ShutdownCause reason)
{
    CPUState *cs;
    X86CPU *cpu;

    qemu_devices_reset(reason);

    /* Reset APIC after devices have been reset to cancel
     * any changes that qemu_devices_reset() might have done.
     */
    CPU_FOREACH(cs) {
        cpu = X86_CPU(cs);

        x86_cpu_after_reset(cpu);
    }
}

static void pc_machine_wakeup(MachineState *machine)
{
    cpu_synchronize_all_states();
    pc_machine_reset(machine, SHUTDOWN_CAUSE_NONE);
    cpu_synchronize_all_post_reset();
}

static bool pc_hotplug_allowed(MachineState *ms, DeviceState *dev, Error **errp)
{
    X86IOMMUState *iommu = x86_iommu_get_default();
    IntelIOMMUState *intel_iommu;

    if (iommu &&
        object_dynamic_cast((Object *)iommu, TYPE_INTEL_IOMMU_DEVICE) &&
        object_dynamic_cast((Object *)dev, "vfio-pci")) {
        intel_iommu = INTEL_IOMMU_DEVICE(iommu);
        if (!intel_iommu->caching_mode) {
            error_setg(errp, "Device assignment is not allowed without "
                       "enabling caching-mode=on for Intel IOMMU.");
            return false;
        }
    }

    return true;
}

static void pc_machine_class_init(ObjectClass *oc, void *data)
{
    MachineClass *mc = MACHINE_CLASS(oc);
    PCMachineClass *pcmc = PC_MACHINE_CLASS(oc);
    HotplugHandlerClass *hc = HOTPLUG_HANDLER_CLASS(oc);

    pcmc->pci_enabled = true;
    pcmc->has_acpi_build = true;
    pcmc->rsdp_in_ram = true;
    pcmc->smbios_defaults = true;
    pcmc->smbios_uuid_encoded = true;
    pcmc->gigabyte_align = true;
    pcmc->has_reserved_memory = true;
    pcmc->kvmclock_enabled = true;
    pcmc->enforce_aligned_dimm = true;
    pcmc->enforce_amd_1tb_hole = true;
    /* BIOS ACPI tables: 128K. Other BIOS datastructures: less than 4K reported
     * to be used at the moment, 32K should be enough for a while.  */
    pcmc->acpi_data_size = 0x20000 + 0x8000;
    pcmc->pvh_enabled = true;
    pcmc->kvmclock_create_always = true;
    pcmc->resizable_acpi_blob = true;
    assert(!mc->get_hotplug_handler);
    mc->get_hotplug_handler = pc_get_hotplug_handler;
    mc->hotplug_allowed = pc_hotplug_allowed;
    mc->cpu_index_to_instance_props = x86_cpu_index_to_props;
    mc->get_default_cpu_node_id = x86_get_default_cpu_node_id;
    mc->possible_cpu_arch_ids = x86_possible_cpu_arch_ids;
    mc->auto_enable_numa_with_memhp = true;
    mc->auto_enable_numa_with_memdev = true;
    mc->has_hotpluggable_cpus = true;
    mc->default_boot_order = "cad";
    mc->block_default_type = IF_IDE;
    mc->max_cpus = 255;
    mc->reset = pc_machine_reset;
    mc->wakeup = pc_machine_wakeup;
    hc->pre_plug = pc_machine_device_pre_plug_cb;
    hc->plug = pc_machine_device_plug_cb;
    hc->unplug_request = pc_machine_device_unplug_request_cb;
    hc->unplug = pc_machine_device_unplug_cb;
    mc->default_cpu_type = TARGET_DEFAULT_CPU_TYPE;
    mc->nvdimm_supported = true;
    mc->smp_props.dies_supported = true;
    mc->default_ram_id = "pc.ram";
    pcmc->default_smbios_ep_type = SMBIOS_ENTRY_POINT_TYPE_64;

    object_class_property_add(oc, PC_MACHINE_MAX_RAM_BELOW_4G, "size",
        pc_machine_get_max_ram_below_4g, pc_machine_set_max_ram_below_4g,
        NULL, NULL);
    object_class_property_set_description(oc, PC_MACHINE_MAX_RAM_BELOW_4G,
        "Maximum ram below the 4G boundary (32bit boundary)");

    object_class_property_add(oc, PC_MACHINE_VMPORT, "OnOffAuto",
        pc_machine_get_vmport, pc_machine_set_vmport,
        NULL, NULL);
    object_class_property_set_description(oc, PC_MACHINE_VMPORT,
        "Enable vmport (pc & q35)");

    object_class_property_add_bool(oc, PC_MACHINE_SMBUS,
        pc_machine_get_smbus, pc_machine_set_smbus);
    object_class_property_set_description(oc, PC_MACHINE_SMBUS,
        "Enable/disable system management bus");

    object_class_property_add_bool(oc, PC_MACHINE_SATA,
        pc_machine_get_sata, pc_machine_set_sata);
    object_class_property_set_description(oc, PC_MACHINE_SATA,
        "Enable/disable Serial ATA bus");

    object_class_property_add_bool(oc, "hpet",
        pc_machine_get_hpet, pc_machine_set_hpet);
    object_class_property_set_description(oc, "hpet",
        "Enable/disable high precision event timer emulation");

    object_class_property_add_bool(oc, PC_MACHINE_I8042,
        pc_machine_get_i8042, pc_machine_set_i8042);

    object_class_property_add_bool(oc, "default-bus-bypass-iommu",
        pc_machine_get_default_bus_bypass_iommu,
        pc_machine_set_default_bus_bypass_iommu);

    object_class_property_add(oc, PC_MACHINE_MAX_FW_SIZE, "size",
        pc_machine_get_max_fw_size, pc_machine_set_max_fw_size,
        NULL, NULL);
    object_class_property_set_description(oc, PC_MACHINE_MAX_FW_SIZE,
        "Maximum combined firmware size");

    object_class_property_add(oc, PC_MACHINE_SMBIOS_EP, "str",
        pc_machine_get_smbios_ep, pc_machine_set_smbios_ep,
        NULL, NULL);
    object_class_property_set_description(oc, PC_MACHINE_SMBIOS_EP,
        "SMBIOS Entry Point type [32, 64]");
}

static const TypeInfo pc_machine_info = {
    .name = TYPE_PC_MACHINE,
    .parent = TYPE_X86_MACHINE,
    .abstract = true,
    .instance_size = sizeof(PCMachineState),
    .instance_init = pc_machine_initfn,
    .class_size = sizeof(PCMachineClass),
    .class_init = pc_machine_class_init,
    .interfaces = (InterfaceInfo[]) {
         { TYPE_HOTPLUG_HANDLER },
         { }
    },
};

static void pc_machine_register_types(void)
{
    type_register_static(&pc_machine_info);
}

type_init(pc_machine_register_types)