[PATCH 0/3] virtio: Clean up scatterlists and use the DMA API

[Andy Lutomirski]

On Wed, Aug 27, 2014 at 10:34 AM, Christopher Covington
<cov at codeaurora.org> wrote:
> On 08/27/2014 12:19 PM, Andy Lutomirski wrote:
>> On Wed, Aug 27, 2014 at 9:13 AM, Christopher Covington
>> <cov at codeaurora.org> wrote:
>
> Virtme looks interesting. If it's any use, here is my modest QEMU command line
> collection.
>
> $dir/bin/x86_64-linux-gnu/qemu-system-x86_64 \
>   -m 1024 \
>   -kernel $dir/boot/x86_64-linux-gnu/bzImage-x86_64 \
>   -append 'root=/dev/root init=/sbin/x86_64-linux-gnu/init rootfstype=9p
> rootflags=trans=virtio,version=9p2000.L ro console=ttyS0' \
>   -serial stdio \
>   -fsdev local,id=root,path=$dir,security_model=none \
>   -device virtio-9p-pci,fsdev=root,mount_tag=/dev/root \
>   -monitor none

This is similar to what virtme does, except that virtme will give you
a much more functional system at the cost of a small fraction of a
second of additional boot time.  And virtme sometimes supports modules
:)

>
> $dir/bin/x86_64-linux-gnu/qemu-system-arm \
>   -M virt \
>   -cpu cortex-a15 \
>   -m 1024 \
>   -kernel $dir/boot/arm-linux-gnueabihf/Image \
>   -append 'root=/dev/root init=/sbin/arm-linux-gnueabihf/init rootfstype=9p
> rootflags=trans=virtio,version=9p2000.L ro console=ttyAMA0' \
>   -serial stdio \
>   -fsdev local,id=root,path=$dir,security_model=none \
>   -device virtio-9p-device,fsdev=root,mount_tag=/dev/root \
>   -monitor none

Can you give me some hints as to how to configure a kernel for this?
I tried to get anything other than versatilepb working and gave up.

>
> $dir/bin/x86_64-linux-gnu/qemu-system-aarch64 \
>   -M virt \
>   -cpu cortex-a57 \
>   -m 1024 \
>   -kernel $dir/boot/aarch64-linux-gnu/Image \
>   -append 'root=/dev/root init=/sbin/aarch64-linux-gnu/init rootfstype=9p
> rootflags=trans=virtio,version=9p2000.L ro console=ttyAMA0' \
>   -serial stdio \
>   -fsdev local,id=root,path=$dir,security_model=none \
>   -device virtio-9p-device,fsdev=root,mount_tag=/dev/root -monitor none
>

Ooh, thanks!  I'll add support for this to virtme.

--Andy