Re: VirtIO MMIO for amd64

[Emile 'iMil' Heitor <imil%home.imil.net@localhost>]

On 2/23/22 20:26, el16095 wrote:
> Firecracker informs VMs about MMIO devices by appending to the boot 
> command line a string like this "virtio_mmio.device=4K@0xd0000000:5" 
> ([virtio_mmio.]device=<size>@<baseaddr>:<irq>). So, from what I 
> understand I'd need to write glue code that takes this information and 
> uses it to setup the MMIO devices on the VM side the way Firecracker 
> expects it to; and then attach virtio through that, right?

FYI I'm on it, based on Colin Percival's work here 
https://github.com/freebsd/freebsd-src/blob/main/sys/dev/virtio/mmio/virtio_mmio_cmdline.c
I'm getting some results but Firecracker uses MMIO v2 and we only have
v1 so there's still quite some work to do.

--
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Emile `iMil' Heitor <imil@{home.imil.net,NetBSD.org}> | https://imil.net