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Re: [PATCH v10 13/15] docs/microvm.rst: document the new microvm machine
From: |
Sergio Lopez |
Subject: |
Re: [PATCH v10 13/15] docs/microvm.rst: document the new microvm machine type |
Date: |
Thu, 17 Oct 2019 13:52:50 +0200 |
User-agent: |
mu4e 1.2.0; emacs 26.2 |
Philippe Mathieu-Daudé <address@hidden> writes:
> On 10/17/19 12:45 PM, Sergio Lopez wrote:
>>
>> Philippe Mathieu-Daudé <address@hidden> 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.
>
> "... but it's also compatible with SeaBIOS"
>
> OK. Maybe we can add a comment such "These devices are the minimum
> required to run SeaBIOS" in the 'Supported devices' section.
Well, that's not exactly true. SeaBIOS works without a serial port, it's
just you can't get it to send its debugging messages anywhere (which
most people won't see anyway).
Sergio.
>>
>> 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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[PATCH v10 15/15] MAINTAINERS: add microvm related files, Sergio Lopez, 2019/10/16
[PATCH v10 14/15] hw/i386: Introduce the microvm machine type, Sergio Lopez, 2019/10/16