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Re: [PATCH v4 0/8] Introduce the microvm machine type
From: |
Pankaj Gupta |
Subject: |
Re: [PATCH v4 0/8] Introduce the microvm machine type |
Date: |
Wed, 25 Sep 2019 04:37:42 -0400 (EDT) |
> >>> 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)
> >>
> >> So I assume also no ACPI (CPU/memory hotplug), correct?
> >
> > Correct.
> >
> >> @Pankaj, I think it would make sense to make virtio-pmem play with
> >> virtio-mmio/microvm.
> >
> > That would be great. I'm also looking forward for virtio-mem (and an
> > hypothetical virtio-cpu) to eventually gain hotplug capabilities in
> > microvm.
>
> @Pankaj, do you have time to look into the virtio-pmem thingy? I guess
> the virtio-mmio rapper shouldn't be too hard (very similar to the
> virtio-pci wrapper - luckily I insisted to make it work independently
> from PCI BARs and ACPI slots ;) ). The microvm bits would be properly
> setting up device memory and wiring up the hotplug handlers, similar as
> done in the other PC machine types (maybe that comes for free?).
Yes, I can look at.
>
> virtio-pmem will allow (in read-only mode) to place the rootfs on a fake
> NVDIMM, as done e.g., in kata containers. We might have to include the
> virtio-pmem kernel module in the initramfs, shouldn't be too hard. Not
> sure what else we'll need to make virtio-pmem get used as a rootfs.
Sure, will work on it.
Thanks,
Pankaj
>
> >
> > Thanks,
> > Sergio.
> >
>
>
> --
>
> Thanks,
>
> David / dhildenb
>
>
- Re: [PATCH v4 8/8] hw/i386: Introduce the microvm machine type, (continued)
- Re: [PATCH v4 0/8] Introduce the microvm machine type, Peter Maydell, 2019/09/24
- Re: [PATCH v4 0/8] Introduce the microvm machine type, David Hildenbrand, 2019/09/25
- Re: [PATCH v4 0/8] Introduce the microvm machine type, Pankaj Gupta, 2019/09/25
- Re: [PATCH v4 0/8] Introduce the microvm machine type, Sergio Lopez, 2019/09/25
- Re: [PATCH v4 0/8] Introduce the microvm machine type, Paolo Bonzini, 2019/09/25
- Re: [PATCH v4 0/8] Introduce the microvm machine type, Sergio Lopez, 2019/09/25
- Re: [PATCH v4 0/8] Introduce the microvm machine type, David Hildenbrand, 2019/09/25
- when to use virtio (was Re: [PATCH v4 0/8] Introduce the microvm machine type), Paolo Bonzini, 2019/09/25
- Re: when to use virtio (was Re: [PATCH v4 0/8] Introduce the microvm machine type), David Hildenbrand, 2019/09/25
- Re: when to use virtio (was Re: [PATCH v4 0/8] Introduce the microvm machine type), Paolo Bonzini, 2019/09/25
- Re: when to use virtio (was Re: [PATCH v4 0/8] Introduce the microvm machine type), David Hildenbrand, 2019/09/25
- Re: [PATCH v4 0/8] Introduce the microvm machine type, Gerd Hoffmann, 2019/09/25
- Re: [PATCH v4 0/8] Introduce the microvm machine type, Paolo Bonzini, 2019/09/25
- Re: [PATCH v4 0/8] Introduce the microvm machine type, David Hildenbrand, 2019/09/25