linux-kernel - ssh session with qemu-arm using busybox

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Date:   Mon, 11 Mar 2019 20:04:53 +0530
From:   Pintu Agarwal <pintu.ping@...il.com>
To:     open list <linux-kernel@...r.kernel.org>,
        kernelnewbies@...nelnewbies.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-riscv@...ts.infradead.org, qemu-devel@...gnu.org,
        전진영 <jy0.jeon@...il.com>
Subject: ssh session with qemu-arm using busybox

Hi,

I have a qemu-arm setup with busybox which I normally use to test my
kernel changes.
I use this command to boot it:

QEMU-ARM$
qemu-system-arm -M vexpress-a9 -m 1024M -kernel
../KERNEL/linux/arch/arm/boot/zImage -dtb
../KERNEL/linux/arch/arm/boot/dts/vexpress-v2p-ca9.dtb -initrd
rootfs.img.gz -append "console=ttyAMA0 root=/dev/ram rdinit=/sbin/init
ip=dhcp" -nographic -smp 4

This includes, my own custom kernel and rootfs build.
For rootfs I use busybox and create cpio image and use it as initrd.

But, every time, if I have to copy some files inside qemu, I need to
create create roofs image.
This is painful.

So, now I am exploring how to transfer files from my ubuntu pc to
qemu-session using "ssh".
I know this is possible, but I am still not successful, and bit lazy
to explore these.

I am sure, many of you people would have explored already "how to use
ssh over qemu" and found a easy method.
So, if anybody have easy setup please share with me.

I could see that after adding "ip=dhcp" I get the eth0 interface like this:
/ # ifconfig
eth0      Link encap:Ethernet  HWaddr 52:54:00:12:34:56
          inet addr:10.0.2.15  Bcast:10.0.2.255  Mask:255.255.255.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:2 errors:0 dropped:0 overruns:0 frame:0
          TX packets:2 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:1180 (1.1 KiB)  TX bytes:1180 (1.1 KiB)
          Interrupt:22

lo        Link encap:Local Loopback
          inet addr:127.0.0.1  Mask:255.0.0.0
          UP LOOPBACK RUNNING  MTU:65536  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)

But I could not ping it from ubuntu PC.

Regards,
Pintu