Re: [PATCH v4 8/8] hw/i386: Introduce the microvm machine type

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Philippe Mathieu-Daudé <philmd@xxxxxxxxxx> writes:

> On 9/24/19 2:44 PM, Sergio Lopez wrote:
>> Microvm is a machine type inspired by both NEMU and Firecracker, and
>> constructed after the machine model implemented by the latter.
>> 
>> It's main purpose is providing users a minimalist machine type free
>> from the burden of legacy compatibility, serving as a stepping stone
>> for future projects aiming at improving boot times, reducing the
>> attack surface and slimming down QEMU's footprint.
>> 
>> The microvm machine type supports the following devices:
>> 
>>  - ISA bus
>>  - i8259 PIC
>>  - LAPIC (implicit if using KVM)
>>  - IOAPIC (defaults to kernel_irqchip_split = true)
>>  - i8254 PIT
>>  - MC146818 RTC (optional)
>>  - kvmclock (if using KVM)
>>  - fw_cfg
>>  - One ISA serial port (optional)
>>  - Up to eight virtio-mmio devices (configured by the user)
>> 
>> It supports the following machine-specific options:
>> 
>> microvm.option-roms=bool (Set off to disable loading option ROMs)
>> microvm.isa-serial=bool (Set off to disable the instantiation an ISA serial port)
>> microvm.rtc=bool (Set off to disable the instantiation of an MC146818 RTC)
>> microvm.kernel-cmdline=bool (Set off to disable adding virtio-mmio devices to the kernel cmdline)
>> 
>> By default, microvm uses qboot as its BIOS, to obtain better boot
>> times, but it's also compatible with SeaBIOS.
>> 
>> As no current FW is able to boot from a block device using virtio-mmio
>> as its transport, a microvm-based VM needs to be run using a host-side
>> kernel and, optionally, an initrd image.
>> 
>> This is an example of instantiating a microvm VM with a virtio-mmio
>> based console:
>> 
>> qemu-system-x86_64 -M microvm
>>  -enable-kvm -cpu host -m 512m -smp 2 \
>>  -kernel vmlinux -append "console=hvc0 root=/dev/vda" \
>>  -nodefaults -no-user-config -nographic \
>>  -chardev stdio,id=virtiocon0,server \
>>  -device virtio-serial-device \
>>  -device virtconsole,chardev=virtiocon0 \
>>  -drive id=test,file=test.img,format=raw,if=none \
>>  -device virtio-blk-device,drive=test \
>>  -netdev tap,id=tap0,script=no,downscript=no \
>>  -device virtio-net-device,netdev=tap0
>> 
>> This is another example, this time using an ISA serial port, useful
>> for debugging purposes:
>> 
>> qemu-system-x86_64 -M microvm \
>>  -enable-kvm -cpu host -m 512m -smp 2 \
>>  -kernel vmlinux -append "earlyprintk=ttyS0 console=ttyS0 root=/dev/vda" \
>>  -nodefaults -no-user-config -nographic \
>>  -serial stdio \
>>  -drive id=test,file=test.img,format=raw,if=none \
>>  -device virtio-blk-device,drive=test \
>>  -netdev tap,id=tap0,script=no,downscript=no \
>>  -device virtio-net-device,netdev=tap0
>> 
>> Finally, in this example a microvm VM is instantiated without RTC,
>> without an ISA serial port and without loading the option ROMs,
>> obtaining the smallest configuration:
>> 
>> qemu-system-x86_64 -M microvm,rtc=off,isa-serial=off,option-roms=off \
>>  -enable-kvm -cpu host -m 512m -smp 2 \
>>  -kernel vmlinux -append "console=hvc0 root=/dev/vda" \
>>  -nodefaults -no-user-config -nographic \
>>  -chardev stdio,id=virtiocon0,server \
>>  -device virtio-serial-device \
>>  -device virtconsole,chardev=virtiocon0 \
>>  -drive id=test,file=test.img,format=raw,if=none \
>>  -device virtio-blk-device,drive=test \
>>  -netdev tap,id=tap0,script=no,downscript=no \
>>  -device virtio-net-device,netdev=tap0
>> 
>> Signed-off-by: Sergio Lopez <slp@xxxxxxxxxx>
>> ---
>>  default-configs/i386-softmmu.mak |   1 +
>>  hw/i386/Kconfig                  |   4 +
>>  hw/i386/Makefile.objs            |   1 +
>>  hw/i386/microvm.c                | 512 +++++++++++++++++++++++++++++++
>>  include/hw/i386/microvm.h        |  80 +++++
>>  5 files changed, 598 insertions(+)
>>  create mode 100644 hw/i386/microvm.c
>>  create mode 100644 include/hw/i386/microvm.h
>> 
>> diff --git a/default-configs/i386-softmmu.mak b/default-configs/i386-softmmu.mak
>> index cd5ea391e8..c27cdd98e9 100644
>> --- a/default-configs/i386-softmmu.mak
>> +++ b/default-configs/i386-softmmu.mak
>> @@ -26,3 +26,4 @@ CONFIG_ISAPC=y
>>  CONFIG_I440FX=y
>>  CONFIG_Q35=y
>>  CONFIG_ACPI_PCI=y
>> +CONFIG_MICROVM=y
>> \ No newline at end of file
>> diff --git a/hw/i386/Kconfig b/hw/i386/Kconfig
>> index 6350438036..324e193dd8 100644
>> --- a/hw/i386/Kconfig
>> +++ b/hw/i386/Kconfig
>> @@ -88,6 +88,10 @@ config Q35
>>      select SMBIOS
>>      select FW_CFG_DMA
>>  
>> +config MICROVM
>> +    bool
>> +    select VIRTIO_MMIO
>> +
>>  config VTD
>>      bool
>>  
>> diff --git a/hw/i386/Makefile.objs b/hw/i386/Makefile.objs
>> index 5b4b3a672e..bb17d54567 100644
>> --- a/hw/i386/Makefile.objs
>> +++ b/hw/i386/Makefile.objs
>> @@ -6,6 +6,7 @@ obj-y += pc.o
>>  obj-y += e820.o
>>  obj-$(CONFIG_I440FX) += pc_piix.o
>>  obj-$(CONFIG_Q35) += pc_q35.o
>> +obj-$(CONFIG_MICROVM) += microvm.o
>>  obj-y += fw_cfg.o pc_sysfw.o
>>  obj-y += x86-iommu.o
>>  obj-$(CONFIG_VTD) += intel_iommu.o
>> diff --git a/hw/i386/microvm.c b/hw/i386/microvm.c
>> new file mode 100644
>> index 0000000000..4b494a1b27
>> --- /dev/null
>> +++ b/hw/i386/microvm.c
>> @@ -0,0 +1,512 @@
>> +/*
>> + * Copyright (c) 2018 Intel Corporation
>> + * Copyright (c) 2019 Red Hat, Inc.
>> + *
>> + * This program is free software; you can redistribute it and/or modify it
>> + * under the terms and conditions of the GNU General Public License,
>> + * version 2 or later, as published by the Free Software Foundation.
>> + *
>> + * This program is distributed in the hope it will be useful, but WITHOUT
>> + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
>> + * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
>> + * more details.
>> + *
>> + * You should have received a copy of the GNU General Public License along with
>> + * this program.  If not, see <http://www.gnu.org/licenses/>.
>> + */
>> +
>> +#include "qemu/osdep.h"
>> +#include "qemu/error-report.h"
>> +#include "qemu/cutils.h"
>> +#include "qemu/units.h"
>> +#include "qapi/error.h"
>> +#include "qapi/visitor.h"
>> +#include "sysemu/sysemu.h"
>> +#include "sysemu/cpus.h"
>> +#include "sysemu/numa.h"
>> +#include "sysemu/reset.h"
>> +
>> +#include "hw/loader.h"
>> +#include "hw/irq.h"
>> +#include "hw/nmi.h"
>> +#include "hw/kvm/clock.h"
>> +#include "hw/i386/microvm.h"
>> +#include "hw/i386/x86.h"
>> +#include "hw/i386/pc.h"
>> +#include "target/i386/cpu.h"
>> +#include "hw/timer/i8254.h"
>> +#include "hw/timer/mc146818rtc.h"
>> +#include "hw/char/serial.h"
>> +#include "hw/i386/topology.h"
>> +#include "hw/i386/e820.h"
>> +#include "hw/i386/fw_cfg.h"
>> +#include "hw/virtio/virtio-mmio.h"
>> +
>> +#include "cpu.h"
>> +#include "elf.h"
>> +#include "pvh.h"
>> +#include "kvm_i386.h"
>> +#include "hw/xen/start_info.h"
>> +
>> +#define MICROVM_BIOS_FILENAME "bios-microvm.bin"
>> +
>> +static void microvm_set_rtc(MicrovmMachineState *mms, ISADevice *s)
>> +{
>> +    X86MachineState *x86ms = X86_MACHINE(mms);
>> +    int val;
>> +
>> +    val = MIN(x86ms->below_4g_mem_size / KiB, 640);
>> +    rtc_set_memory(s, 0x15, val);
>> +    rtc_set_memory(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;
>> +    }
>> +    rtc_set_memory(s, 0x17, val);
>> +    rtc_set_memory(s, 0x18, val >> 8);
>> +    rtc_set_memory(s, 0x30, val);
>> +    rtc_set_memory(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;
>> +    }
>> +    rtc_set_memory(s, 0x34, val);
>> +    rtc_set_memory(s, 0x35, val >> 8);
>> +    /* memory above 4GiB */
>> +    val = x86ms->above_4g_mem_size / 65536;
>> +    rtc_set_memory(s, 0x5b, val);
>> +    rtc_set_memory(s, 0x5c, val >> 8);
>> +    rtc_set_memory(s, 0x5d, val >> 16);
>> +}
>> +
>> +static void microvm_devices_init(MicrovmMachineState *mms)
>> +{
>> +    X86MachineState *x86ms = X86_MACHINE(mms);
>> +    ISABus *isa_bus;
>> +    ISADevice *rtc_state;
>> +    GSIState *gsi_state;
>> +    qemu_irq *i8259;
>> +    int i;
>> +
>> +    gsi_state = g_malloc0(sizeof(*gsi_state));
>> +    x86ms->gsi = qemu_allocate_irqs(gsi_handler, gsi_state, GSI_NUM_PINS);
>> +
>> +    isa_bus = isa_bus_new(NULL, get_system_memory(), get_system_io(),
>> +                          &error_abort);
>> +    isa_bus_irqs(isa_bus, x86ms->gsi);
>> +
>> +    i8259 = i8259_init(isa_bus, pc_allocate_cpu_irq());
>> +
>> +    for (i = 0; i < ISA_NUM_IRQS; i++) {
>> +        gsi_state->i8259_irq[i] = i8259[i];
>> +    }
>> +
>> +    ioapic_init_gsi(gsi_state, "machine");
>> +
>> +    if (mms->rtc_enabled) {
>> +        rtc_state = mc146818_rtc_init(isa_bus, 2000, NULL);
>> +        microvm_set_rtc(mms, rtc_state);
>> +    }
>> +
>
> Maybe refactor that ...
>
>> +    if (kvm_pit_in_kernel()) {
>> +        kvm_pit_init(isa_bus, 0x40);
>> +    } else {
>> +        i8254_pit_init(isa_bus, 0x40, 0, NULL);
>> +    }
>
> ... as a x86_pit_create() function?

This is deemed to change in v5, as we want to avoid the legacy PIC+PIT
when possible.

>> +
>> +    kvmclock_create();
>> +
>> +    for (i = 0; i < VIRTIO_NUM_TRANSPORTS; i++) {
>> +        int nirq = VIRTIO_IRQ_BASE + i;
>> +        ISADevice *isadev = isa_create(isa_bus, TYPE_ISA_SERIAL);
>> +        qemu_irq mmio_irq;
>> +
>> +        isa_init_irq(isadev, &mmio_irq, nirq);
>> +        sysbus_create_simple("virtio-mmio",
>> +                             VIRTIO_MMIO_BASE + i * 512,
>> +                             x86ms->gsi[VIRTIO_IRQ_BASE + i]);
>> +    }
>> +
>> +    g_free(i8259);
>
> Not related to this patch, but i8259_init() API is not clear,
> it returns an allocated array of allocated qemu_irqs? Is it safe to copy
> them to gsi_state then free the array?

That's how I understand it, and also how it's used elsewhere.

>> +
>> +    if (mms->isa_serial_enabled) {
>> +        serial_hds_isa_init(isa_bus, 0, 1);
>> +    }
>> +
>> +    if (bios_name == NULL) {
>> +        bios_name = MICROVM_BIOS_FILENAME;
>> +    }
>> +    x86_system_rom_init(get_system_memory(), true);
>> +}
>> +
>> +static void microvm_memory_init(MicrovmMachineState *mms)
>> +{
>> +    MachineState *machine = MACHINE(mms);
>> +    X86MachineState *x86ms = X86_MACHINE(mms);
>> +    MemoryRegion *ram, *ram_below_4g, *ram_above_4g;
>> +    MemoryRegion *system_memory = get_system_memory();
>> +    FWCfgState *fw_cfg;
>> +    ram_addr_t lowmem;
>> +    int i;
>> +
>> +    /*
>> +     * Check whether RAM fits below 4G (leaving 1/2 GByte for IO memory
>> +     * and 256 Mbytes for PCI Express Enhanced Configuration Access Mapping
>> +     * also known as MMCFG).
>> +     * If it doesn't, we need to split it in chunks below and above 4G.
>> +     * In any case, try to make sure that guest addresses aligned at
>> +     * 1G boundaries get mapped to host addresses aligned at 1G boundaries.
>> +     */
>> +    if (machine->ram_size >= 0xb0000000) {
>> +        lowmem = 0x80000000;
>> +    } else {
>> +        lowmem = 0xb0000000;
>> +    }
>> +
>> +    /*
>> +     * Handle the machine opt max-ram-below-4g.  It is basically doing
>> +     * min(qemu limit, user limit).
>> +     */
>> +    if (!x86ms->max_ram_below_4g) {
>> +        x86ms->max_ram_below_4g = 1ULL << 32; /* default: 4G */
>
> Please use '4 * GiB' with no comment.

Ack (this is copypaste from pc_q35.c).

>> +    }
>> +    if (lowmem > x86ms->max_ram_below_4g) {
>> +        lowmem = x86ms->max_ram_below_4g;
>> +        if (machine->ram_size - lowmem > lowmem &&
>> +            lowmem & (1 * GiB - 1)) {
>> +            warn_report("There is possibly poor performance as the ram size "
>> +                        " (0x%" PRIx64 ") is more then twice the size of"
>> +                        " max-ram-below-4g (%"PRIu64") and"
>> +                        " max-ram-below-4g is not a multiple of 1G.",
>> +                        (uint64_t)machine->ram_size, x86ms->max_ram_below_4g);
>> +        }
>> +    }
>> +
>> +    if (machine->ram_size > lowmem) {
>> +        x86ms->above_4g_mem_size = machine->ram_size - lowmem;
>> +        x86ms->below_4g_mem_size = lowmem;
>> +    } else {
>> +        x86ms->above_4g_mem_size = 0;
>> +        x86ms->below_4g_mem_size = machine->ram_size;
>> +    }
>> +
>> +    ram = g_malloc(sizeof(*ram));
>> +    memory_region_allocate_system_memory(ram, NULL, "microvm.ram",
>> +                                         machine->ram_size);
>> +
>> +    ram_below_4g = g_malloc(sizeof(*ram_below_4g));
>> +    memory_region_init_alias(ram_below_4g, NULL, "ram-below-4g", 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", ram,
>> +                                 x86ms->below_4g_mem_size,
>> +                                 x86ms->above_4g_mem_size);
>> +        memory_region_add_subregion(system_memory, 0x100000000ULL,
>> +                                    ram_above_4g);
>> +        e820_add_entry(0x100000000ULL, x86ms->above_4g_mem_size, E820_RAM);
>> +    }
>> +
>> +    fw_cfg = fw_cfg_init_io_dma(FW_CFG_IO_BASE, FW_CFG_IO_BASE + 4,
>> +                                &address_space_memory);
>> +
>> +    fw_cfg_add_i16(fw_cfg, FW_CFG_NB_CPUS, x86ms->boot_cpus);
>> +    fw_cfg_add_i16(fw_cfg, FW_CFG_MAX_CPUS, (uint16_t)x86ms->apic_id_limit);
>> +    fw_cfg_add_i64(fw_cfg, FW_CFG_RAM_SIZE, (uint64_t)machine->ram_size);
>> +    fw_cfg_add_i32(fw_cfg, FW_CFG_IRQ0_OVERRIDE, kvm_allows_irq0_override());
>> +
>> +    rom_set_fw(fw_cfg);
>> +
>> +    e820_create_fw_entry(fw_cfg);
>> +
>> +    load_linux(x86ms, fw_cfg, 0, true, true);
>> +
>> +    if (mms->option_roms_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;
>> +    x86ms->ioapic_as = &address_space_memory;
>> +}
>> +
>> +static gchar *microvm_get_mmio_cmdline(gchar *name)
>> +{
>> +    gchar *cmdline;
>> +    gchar *separator;
>> +    long int index;
>> +    int ret;
>> +
>> +    separator = g_strrstr(name, ".");
>> +    if (!separator) {
>> +        return NULL;
>> +    }
>> +
>> +    if (qemu_strtol(separator + 1, NULL, 10, &index) != 0) {
>> +        return NULL;
>> +    }
>> +
>> +    cmdline = g_malloc0(VIRTIO_CMDLINE_MAXLEN);
>> +    ret = g_snprintf(cmdline, VIRTIO_CMDLINE_MAXLEN,
>> +                     " virtio_mmio.device=512@0x%lx:%ld",
>> +                     VIRTIO_MMIO_BASE + index * 512,
>> +                     VIRTIO_IRQ_BASE + index);
>> +    if (ret < 0 || ret >= VIRTIO_CMDLINE_MAXLEN) {
>> +        g_free(cmdline);
>> +        return NULL;
>> +    }
>> +
>> +    return cmdline;
>> +}
>> +
>> +static void microvm_fix_kernel_cmdline(MachineState *machine)
>> +{
>> +    X86MachineState *x86ms = X86_MACHINE(machine);
>> +    BusState *bus;
>> +    BusChild *kid;
>> +    char *cmdline;
>> +
>> +    /*
>> +     * Find MMIO transports with attached devices, and add them to the kernel
>> +     * command line.
>> +     *
>> +     * Yes, this is a hack, but one that heavily improves the UX without
>> +     * introducing any significant issues.
>> +     */
>> +    cmdline = g_strdup(machine->kernel_cmdline);
>> +    bus = sysbus_get_default();
>> +    QTAILQ_FOREACH(kid, &bus->children, sibling) {
>> +        DeviceState *dev = kid->child;
>> +        ObjectClass *class = object_get_class(OBJECT(dev));
>> +
>> +        if (class == object_class_by_name(TYPE_VIRTIO_MMIO)) {
>> +            VirtIOMMIOProxy *mmio = VIRTIO_MMIO(OBJECT(dev));
>> +            VirtioBusState *mmio_virtio_bus = &mmio->bus;
>> +            BusState *mmio_bus = &mmio_virtio_bus->parent_obj;
>> +
>> +            if (!QTAILQ_EMPTY(&mmio_bus->children)) {
>> +                gchar *mmio_cmdline = microvm_get_mmio_cmdline(mmio_bus->name);
>> +                if (mmio_cmdline) {
>> +                    char *newcmd = g_strjoin(NULL, cmdline, mmio_cmdline, NULL);
>> +                    g_free(mmio_cmdline);
>> +                    g_free(cmdline);
>> +                    cmdline = newcmd;
>> +                }
>> +            }
>> +        }
>> +    }
>> +
>> +    fw_cfg_modify_i32(x86ms->fw_cfg, FW_CFG_CMDLINE_SIZE, strlen(cmdline) + 1);
>> +    fw_cfg_modify_string(x86ms->fw_cfg, FW_CFG_CMDLINE_DATA, cmdline);
>> +}
>> +
>> +static void microvm_machine_state_init(MachineState *machine)
>> +{
>> +    MicrovmMachineState *mms = MICROVM_MACHINE(machine);
>> +    X86MachineState *x86ms = X86_MACHINE(machine);
>> +    Error *local_err = NULL;
>> +
>> +    if (machine->kernel_filename == NULL) {
>> +        error_report("missing kernel image file name, required by microvm");
>> +        exit(1);
>> +    }
>> +
>> +    microvm_memory_init(mms);
>> +
>> +    x86_cpus_init(x86ms, CPU_VERSION_LATEST);
>> +    if (local_err) {
>> +        error_report_err(local_err);
>> +        exit(1);
>> +    }
>> +
>> +    microvm_devices_init(mms);
>> +}
>> +
>> +static void microvm_machine_reset(MachineState *machine)
>> +{
>> +    MicrovmMachineState *mms = MICROVM_MACHINE(machine);
>> +    CPUState *cs;
>> +    X86CPU *cpu;
>> +
>> +    if (mms->kernel_cmdline_enabled && !mms->kernel_cmdline_fixed) {
>> +        microvm_fix_kernel_cmdline(machine);
>> +        mms->kernel_cmdline_fixed = true;
>> +    }
>> +
>> +    qemu_devices_reset();
>> +
>> +    CPU_FOREACH(cs) {
>> +        cpu = X86_CPU(cs);
>> +
>> +        if (cpu->apic_state) {
>> +            device_reset(cpu->apic_state);
>> +        }
>> +    }
>> +}
>> +
>> +static bool microvm_machine_get_rtc(Object *obj, Error **errp)
>> +{
>> +    MicrovmMachineState *mms = MICROVM_MACHINE(obj);
>> +
>> +    return mms->rtc_enabled;
>> +}
>> +
>> +static void microvm_machine_set_rtc(Object *obj, bool value, Error **errp)
>> +{
>> +    MicrovmMachineState *mms = MICROVM_MACHINE(obj);
>> +
>> +    mms->rtc_enabled = value;
>> +}
>> +
>> +static bool microvm_machine_get_isa_serial(Object *obj, Error **errp)
>> +{
>> +    MicrovmMachineState *mms = MICROVM_MACHINE(obj);
>> +
>> +    return mms->isa_serial_enabled;
>> +}
>> +
>> +static void microvm_machine_set_isa_serial(Object *obj, bool value,
>> +                                           Error **errp)
>> +{
>> +    MicrovmMachineState *mms = MICROVM_MACHINE(obj);
>> +
>> +    mms->isa_serial_enabled = value;
>> +}
>> +
>> +static bool microvm_machine_get_option_roms(Object *obj, Error **errp)
>> +{
>> +    MicrovmMachineState *mms = MICROVM_MACHINE(obj);
>> +
>> +    return mms->option_roms_enabled;
>> +}
>> +
>> +static void microvm_machine_set_option_roms(Object *obj, bool value,
>> +                                            Error **errp)
>> +{
>> +    MicrovmMachineState *mms = MICROVM_MACHINE(obj);
>> +
>> +    mms->option_roms_enabled = value;
>> +}
>> +
>> +static bool microvm_machine_get_kernel_cmdline(Object *obj, Error **errp)
>> +{
>> +    MicrovmMachineState *mms = MICROVM_MACHINE(obj);
>> +
>> +    return mms->kernel_cmdline_enabled;
>> +}
>> +
>> +static void microvm_machine_set_kernel_cmdline(Object *obj, bool value,
>> +                                               Error **errp)
>> +{
>> +    MicrovmMachineState *mms = MICROVM_MACHINE(obj);
>> +
>> +    mms->kernel_cmdline_enabled = value;
>> +}
>> +
>> +static void microvm_machine_initfn(Object *obj)
>> +{
>> +    MicrovmMachineState *mms = MICROVM_MACHINE(obj);
>> +
>> +    /* Configuration */
>> +    mms->rtc_enabled = true;
>> +    mms->isa_serial_enabled = true;
>> +    mms->option_roms_enabled = true;
>> +    mms->kernel_cmdline_enabled = true;
>> +
>> +    /* State */
>> +    mms->kernel_cmdline_fixed = false;
>> +}
>> +
>> +static void microvm_class_init(ObjectClass *oc, void *data)
>> +{
>> +    MachineClass *mc = MACHINE_CLASS(oc);
>> +    NMIClass *nc = NMI_CLASS(oc);
>> +
>> +    mc->init = microvm_machine_state_init;
>> +
>> +    mc->family = "microvm_i386";
>> +    mc->desc = "Microvm (i386)";
>> +    mc->units_per_default_bus = 1;
>> +    mc->no_floppy = 1;
>> +    machine_class_allow_dynamic_sysbus_dev(mc, "sysbus-debugcon");
>> +    machine_class_allow_dynamic_sysbus_dev(mc, "sysbus-debugexit");
>
> Aren't these common to X86?

Hm... Those seem to be leftovers from NEMU's virt.c. I'll check it those
are really needed.

>> +    mc->max_cpus = 288;
>> +    mc->has_hotpluggable_cpus = false;
>> +    mc->auto_enable_numa_with_memhp = false;
>> +    mc->default_cpu_type = TARGET_DEFAULT_CPU_TYPE;
>> +    mc->nvdimm_supported = false;
>> +
>> +    /* Avoid relying too much on kernel components */
>> +    mc->default_kernel_irqchip_split = true;
>> +
>> +    /* Machine class handlers */
>> +    mc->reset = microvm_machine_reset;
>> +
>> +    /* NMI handler */
>> +    nc->nmi_monitor_handler = x86_nmi;
>> +
>> +    object_class_property_add_bool(oc, MICROVM_MACHINE_RTC,
>> +                                   microvm_machine_get_rtc,
>> +                                   microvm_machine_set_rtc,
>> +                                   &error_abort);
>> +    object_class_property_set_description(oc, MICROVM_MACHINE_RTC,
>> +        "Set off to disable the instantiation of an MC146818 RTC",
>> +        &error_abort);
>> +
>> +    object_class_property_add_bool(oc, MICROVM_MACHINE_ISA_SERIAL,
>> +                                   microvm_machine_get_isa_serial,
>> +                                   microvm_machine_set_isa_serial,
>> +                                   &error_abort);
>> +    object_class_property_set_description(oc, MICROVM_MACHINE_ISA_SERIAL,
>> +        "Set off to disable the instantiation an ISA serial port",
>> +        &error_abort);
>> +
>> +    object_class_property_add_bool(oc, MICROVM_MACHINE_OPTION_ROMS,
>> +                                   microvm_machine_get_option_roms,
>> +                                   microvm_machine_set_option_roms,
>> +                                   &error_abort);
>> +    object_class_property_set_description(oc, MICROVM_MACHINE_OPTION_ROMS,
>> +        "Set off to disable loading option ROMs", &error_abort);
>> +
>> +    object_class_property_add_bool(oc, MICROVM_MACHINE_KERNEL_CMDLINE,
>> +                                   microvm_machine_get_kernel_cmdline,
>> +                                   microvm_machine_set_kernel_cmdline,
>> +                                   &error_abort);
>> +    object_class_property_set_description(oc, MICROVM_MACHINE_KERNEL_CMDLINE,
>> +        "Set off to disable adding virtio-mmio devices to the kernel cmdline",
>> +        &error_abort);
>> +}
>> +
>> +static const TypeInfo microvm_machine_info = {
>> +    .name          = TYPE_MICROVM_MACHINE,
>> +    .parent        = TYPE_X86_MACHINE,
>> +    .instance_size = sizeof(MicrovmMachineState),
>> +    .instance_init = microvm_machine_initfn,
>> +    .class_size    = sizeof(MicrovmMachineClass),
>> +    .class_init    = microvm_class_init,
>> +    .interfaces = (InterfaceInfo[]) {
>> +         { TYPE_NMI },
>
> Isn't this inherited from TYPE_X86_MACHINE?

Good question. Should we assume all x86 based machines have NMI, or just
leave it to each board?

Thanks,
Sergio.

>> +         { }
>> +    },
>> +};
>> +
>> +static void microvm_machine_init(void)
>> +{
>> +    type_register_static(&microvm_machine_info);
>> +}
>> +type_init(microvm_machine_init);
>> diff --git a/include/hw/i386/microvm.h b/include/hw/i386/microvm.h
>> new file mode 100644
>> index 0000000000..04c8caf886
>> --- /dev/null
>> +++ b/include/hw/i386/microvm.h
>> @@ -0,0 +1,80 @@
>> +/*
>> + * Copyright (c) 2018 Intel Corporation
>> + * Copyright (c) 2019 Red Hat, Inc.
>> + *
>> + * This program is free software; you can redistribute it and/or modify it
>> + * under the terms and conditions of the GNU General Public License,
>> + * version 2 or later, as published by the Free Software Foundation.
>> + *
>> + * This program is distributed in the hope it will be useful, but WITHOUT
>> + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
>> + * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
>> + * more details.
>> + *
>> + * You should have received a copy of the GNU General Public License along with
>> + * this program.  If not, see <http://www.gnu.org/licenses/>.
>> + */
>> +
>> +#ifndef HW_I386_MICROVM_H
>> +#define HW_I386_MICROVM_H
>> +
>> +#include "qemu-common.h"
>> +#include "exec/hwaddr.h"
>> +#include "qemu/notify.h"
>> +
>> +#include "hw/boards.h"
>> +#include "hw/i386/x86.h"
>> +
>> +/* Microvm memory layout */
>> +#define PVH_START_INFO        0x6000
>> +#define MEMMAP_START          0x7000
>> +#define MODLIST_START         0x7800
>> +#define BOOT_STACK_POINTER    0x8ff0
>> +#define PML4_START            0x9000
>> +#define PDPTE_START           0xa000
>> +#define PDE_START             0xb000
>> +#define KERNEL_CMDLINE_START  0x20000
>> +#define EBDA_START            0x9fc00
>> +#define HIMEM_START           0x100000
>> +
>> +/* Platform virtio definitions */
>> +#define VIRTIO_MMIO_BASE      0xc0000000
>> +#define VIRTIO_IRQ_BASE       5
>> +#define VIRTIO_NUM_TRANSPORTS 8
>> +#define VIRTIO_CMDLINE_MAXLEN 64
>> +
>> +/* Machine type options */
>> +#define MICROVM_MACHINE_RTC            "rtc"
>> +#define MICROVM_MACHINE_ISA_SERIAL     "isa-serial"
>> +#define MICROVM_MACHINE_OPTION_ROMS    "option-roms"
>> +#define MICROVM_MACHINE_KERNEL_CMDLINE "kernel-cmdline"
>> +
>> +typedef struct {
>> +    X86MachineClass parent;
>> +    HotplugHandler *(*orig_hotplug_handler)(MachineState *machine,
>> +                                           DeviceState *dev);
>> +} MicrovmMachineClass;
>> +
>> +typedef struct {
>> +    X86MachineState parent;
>> +
>> +    /* Machine type options */
>> +    bool rtc_enabled;
>> +    bool isa_serial_enabled;
>> +    bool option_roms_enabled;
>> +    bool kernel_cmdline_enabled;
>> +
>> +
>> +    /* Machine state */
>> +    bool kernel_cmdline_fixed;
>> +} MicrovmMachineState;
>> +
>> +#define TYPE_MICROVM_MACHINE   MACHINE_TYPE_NAME("microvm")
>> +#define MICROVM_MACHINE(obj) \
>> +    OBJECT_CHECK(MicrovmMachineState, (obj), TYPE_MICROVM_MACHINE)
>> +#define MICROVM_MACHINE_GET_CLASS(obj) \
>> +    OBJECT_GET_CLASS(MicrovmMachineClass, obj, TYPE_MICROVM_MACHINE)
>> +#define MICROVM_MACHINE_CLASS(class) \
>> +    OBJECT_CLASS_CHECK(MicrovmMachineClass, class, TYPE_MICROVM_MACHINE)
>> +
>> +#endif
>> 

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