Re: [PATCH v5 10/10] hw/i386: Introduce the microvm machine type

[Thomas Huth <thuth@redhat.com>]

On 02/10/2019 13.31, Sergio Lopez wrote:
> Microvm is a machine type inspired by Firecracker and constructed
> after the its machine model.
> 
> It's a minimalist machine type without PCI nor ACPI support, designed
> for short-lived guests. Microvm also establishes a baseline for
> benchmarking and optimizing both QEMU and guest operating systems,
> since it is optimized for both boot time and footprint.
> 
> Signed-off-by: Sergio Lopez <slp@redhat.com>
> ---
>  default-configs/i386-softmmu.mak |   1 +
>  hw/i386/Kconfig                  |   4 +
>  hw/i386/Makefile.objs            |   1 +
>  hw/i386/microvm.c                | 574 +++++++++++++++++++++++++++++++
>  include/hw/i386/microvm.h        |  83 +++++
>  5 files changed, 663 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 4229900f57..4cc64dafa2 100644
> --- a/default-configs/i386-softmmu.mak
> +++ b/default-configs/i386-softmmu.mak
> @@ -28,3 +28,4 @@
>  CONFIG_ISAPC=y
>  CONFIG_I440FX=y
>  CONFIG_Q35=y
> +CONFIG_MICROVM=y
> diff --git a/hw/i386/Kconfig b/hw/i386/Kconfig
> index c5c9d4900e..d399dcba52 100644
> --- a/hw/i386/Kconfig
> +++ b/hw/i386/Kconfig
> @@ -92,6 +92,10 @@ config Q35
>      select SMBIOS
>      select FW_CFG_DMA
>  
> +config MICROVM
> +    bool
> +    select VIRTIO_MMIO

You also need these switches, I think:

    select I8259
    select ISA_BUS
    select SERIAL_ISA
    select MC146818RTC

(ideally, it should be possible to disable all the other machines in
default-configs/i386-softmmu.mak and only compile with CONFIG_MICROVM=y
... but seems like there are also some other indirect dependencies left)

 Thomas