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Re: [Qemu-devel] Using virtio-mmio

From: Peter Maydell
Subject: Re: [Qemu-devel] Using virtio-mmio
Date: Wed, 31 Jul 2013 23:01:11 +0100

On 31 July 2013 22:56, Richard W.M. Jones <address@hidden> wrote:
> It's quite exciting the virtio-mmio made it into qemu.  Are extra
> guest kernel components needed too? (I'm using 3.9.9-302.fc19.armv7hl
> but could try a later kernel)

I think you're OK there, the support's been in the kernel for
much longer than it's been in QEMU.

> Anyway, I tried to get it to work, but can't quite work out the qemu
> command line.  So far I have:
> $ ~/d/qemu/arm-softmmu/qemu-system-arm -M vexpress-a15 -cpu cortex-a15 \
>     -nographic -kernel kernel -initrd initrd \
>     -drive file=root,if=virtio \
>     -append "root=/dev/vda"
> qemu-system-arm: -drive file=root,if=virtio: No 'PCI' bus found for device 
> 'virtio-blk-pci'

You need to specify things longhand with the virtio-blk-device etc
devices, because the shortcuts all assume virtio is PCI. So in
this case:

   -drive if=none,file=root,id=foo \
   -device virtio-blk-device,drive=foo

-- PMM

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