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Re: [Qemu-devel] [PATCH v3 0/4] Introduce the microvm machine type

From: Peter Maydell
Subject: Re: [Qemu-devel] [PATCH v3 0/4] Introduce the microvm machine type
Date: Tue, 2 Jul 2019 16:23:10 +0100

On Tue, 2 Jul 2019 at 13:14, Sergio Lopez <address@hidden> wrote:
> 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 KVM-only machine type with fast
> boot times, minimal attack surface (measured as the number of IO ports
> and MMIO regions exposed to the Guest) and small footprint (specially
> when combined with the ongoing QEMU modularization effort).
> Normally, other than the device support provided by KVM itself,
> microvm only supports virtio-mmio devices. Microvm also includes a
> legacy mode, which adds an ISA bus with a 16550A serial port, useful
> for being able to see the early boot kernel messages.

Could we use virtio-pci instead of virtio-mmio? virtio-mmio is
a bit deprecated and tends not to support all the features that
virtio-pci does. It was introduced mostly as a stopgap while we
didn't have pci support in the aarch64 virt machine, and remains
for legacy "we don't like to break existing working setups" rather
than as a recommended config for new systems.

-- PMM

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