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Re: [PATCH v4 7/8] docs/microvm.txt: document the new microvm machine ty
From: |
Sergio Lopez |
Subject: |
Re: [PATCH v4 7/8] docs/microvm.txt: document the new microvm machine type |
Date: |
Wed, 25 Sep 2019 10:40:13 +0200 |
User-agent: |
mu4e 1.2.0; emacs 26.2 |
Paolo Bonzini <address@hidden> writes:
> On 25/09/19 07:49, Sergio Lopez wrote:
>>>> +serving as a stepping stone
>>>> +for future projects aiming at improving boot times, reducing the
>>>> +attack surface and slimming down QEMU's footprint.
>>>
>>> "Microvm also establishes a baseline for benchmarking QEMU and operating
>>> systems, since it is optimized for both boot time and footprint".
>>
>> Well, I prefer my paragraph, but I'm good with either.
>
> You're right my version sort of missed the point. What about
> s/benchmarking/benchmarking and optimizing/?
>
>>>> +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
>>>
>>> Do we need the PIT? And perhaps the PIC even?
>>
>> We need the PIT for non-KVM accel (if present with KVM and
>> kernel_irqchip_split = off, it basically becomes a placeholder)
>
> Why?
Perhaps I'm missing something. Is some other device supposed to be
acting as a HW timer while running with TCG acceleration?
>> and the
>> PIC for both the PIT and the ISA serial port.
>
> Can't the ISA serial port work with the IOAPIC?
Hm... I'm not sure. I wanted to give it a try, but then noticed that
multiple places in the code (like hw/intc/apic.c:560) do expect to have
an ISA PIC present through the isa_pic global variable.
I guess we should be able to work around this, but I'm not sure if it's
really worth it. What do you think?
Thanks,
Sergio.
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- [PATCH v4 4/8] hw/i386: split PCMachineState deriving X86MachineState from it, (continued)
- [PATCH v4 4/8] hw/i386: split PCMachineState deriving X86MachineState from it, Sergio Lopez, 2019/09/24
- [PATCH v4 6/8] roms: add microvm-bios (qboot) as binary and git submodule, Sergio Lopez, 2019/09/24
- [PATCH v4 7/8] docs/microvm.txt: document the new microvm machine type, Sergio Lopez, 2019/09/24
- Re: [PATCH v4 7/8] docs/microvm.txt: document the new microvm machine type, Paolo Bonzini, 2019/09/24
- Re: [PATCH v4 7/8] docs/microvm.txt: document the new microvm machine type, Sergio Lopez, 2019/09/25
- Re: [PATCH v4 7/8] docs/microvm.txt: document the new microvm machine type, Paolo Bonzini, 2019/09/25
- Re: [PATCH v4 7/8] docs/microvm.txt: document the new microvm machine type,
Sergio Lopez <=
- Re: [PATCH v4 7/8] docs/microvm.txt: document the new microvm machine type, Paolo Bonzini, 2019/09/25
- Re: [PATCH v4 7/8] docs/microvm.txt: document the new microvm machine type, Sergio Lopez, 2019/09/25
- Re: [PATCH v4 7/8] docs/microvm.txt: document the new microvm machine type, Paolo Bonzini, 2019/09/25
- Re: [PATCH v4 7/8] docs/microvm.txt: document the new microvm machine type, Sergio Lopez, 2019/09/25
- Re: [PATCH v4 7/8] docs/microvm.txt: document the new microvm machine type, Paolo Bonzini, 2019/09/25
- Re: [PATCH v4 7/8] docs/microvm.txt: document the new microvm machine type, Sergio Lopez, 2019/09/26
- Re: [PATCH v4 7/8] docs/microvm.txt: document the new microvm machine type, Paolo Bonzini, 2019/09/26
- Re: [PATCH v4 7/8] docs/microvm.txt: document the new microvm machine type, Sergio Lopez, 2019/09/26
- Re: [PATCH v4 7/8] docs/microvm.txt: document the new microvm machine type, Paolo Bonzini, 2019/09/26
- Re: [PATCH v4 7/8] docs/microvm.txt: document the new microvm machine type, Sergio Lopez, 2019/09/26