On Thu, May 19, 2011 at 3:02 AM, Sasha Levin <levinsasha928@xxxxxxxxx> wrote:
> Overview:
> 9p allows for simple RPC based resource sharing over
> different transports (in our case, virtio).
>
> This is the implementation of (most of) the original
> 9p2000 protocol, without the .u or the .l extensions.
>
> How to use:
> 1. Make sure kernel is compiled with:
> CONFIG_NET_9P=y
> CONFIG_NET_9P_VIRTIO=y
> CONFIG_NET_9P_DEBUG=y (At least until code is stable)
> CONFIG_9P_FS=y
>
> 2. Start KVM with '--virtio-9p <dirname>'. What happens now is that
> a virtio transport with the name 'kvm_9p' is created. The server side
> of the transport maps dirname to the root of the file system.
>
> 3. Within the guest, mount the fs:
> mount -t 9p -otrans=virtio kvm_9p <local_dir> -oversion=9p2000
> This will mount the 9p server to local_dir.
>
> Signed-off-by: Sasha Levin <levinsasha928@xxxxxxxxx>
> ---
...
> +struct p9_msg {
> + u32 size;
> + u8 cmd;
> + u16 tag;
> + u8 msg[0];
> +} __attribute__((aligned (8)));
> +
Hi Sasha, could you enlighten me, why do we need
__attribute__((aligned (8))) here at all? Probably packed are to be
used instead?
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