Re: [PATCH v10 13/15] docs/microvm.rst: document the new microvm machine type

[Sergio Lopez <slp@redhat.com>]

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Philippe Mathieu-Daudé <philmd@redhat.com> writes:

> Hi Sergio,
>
> On 10/16/19 12:12 PM, Sergio Lopez wrote:
>> +Supported devices
>> +-----------------
>> +
>> +The microvm machine type supports the following devices:
>> +
>> +- ISA bus
>> +- i8259 PIC (optional)
>> +- i8254 PIT (optional)
>> +- MC146818 RTC (optional)
>> +- One ISA serial port (optional)
>> +- LAPIC
>> +- IOAPIC (with kernel-irqchip=split by default)
>> +- kvmclock (if using KVM)
>> +- fw_cfg
>> +- Up to eight virtio-mmio devices (configured by the user)
>
> If we have VirtIO devices, why not use virtio-serial instead of the
> one on the ISA bus?

The serial port on the ISA bus is simpler, and thus is supported for
both SeaBIOS debugging and Linux's earlyprintk. This makes it *very*
convenient for debugging boot issues.

Also, as it's explained in the documentation, users that no longer need
it can disable the device and just rely on virtio-console.

Sergio.

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