linux-kernel - Re: arm64 Kernel build for qemu-system-aarch64 ?

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Message-ID: <CAOuPNLixfZUzVyv4uHzwWPXWQmCYwNUtTOtNXFwOg8aPZda3aw@mail.gmail.com>
Date:   Fri, 22 Feb 2019 22:20:35 +0530
From:   Pintu Agarwal <pintu.ping@...il.com>
To:     Mark Rutland <mark.rutland@....com>
Cc:     open list <linux-kernel@...r.kernel.org>,
        linux-arm-kernel@...ts.infradead.org,
        linux-riscv@...ts.infradead.org, kernelnewbies@...nelnewbies.org
Subject: Re: arm64 Kernel build for qemu-system-aarch64 ?

On Fri, Feb 22, 2019 at 7:41 PM Mark Rutland <mark.rutland@....com> wrote:
>
> On Fri, Feb 22, 2019 at 07:17:00PM +0530, Pintu Agarwal wrote:
> > Hi All,
>
> Hi,
>
> > I want to build Linux Kernel 4.20 for arm64 and use it on qemu-arm64.
> > I see that there is a defconfig available in arch/arm64/configs/defconfig
> > But I am not sure whether it will work for qemu-arm64, and by default
> > which machine type is supported.
> >
> > I already have working setup for qemu-arm for both versatile and
> > vexpress machine. There is already a defconfig available for these
> > under arch/arm.
> > So I can build the kernel for it.
> >
> > But, whether these defconfig are supported for arm64 ?
> > If anybody have setup for qemu-arm64 kernel, please share the steps.
> > About rootfs, I am planning to use the arm32 version of busybox itself.
>
> The arm64 defconfig is intended to work for all platforms.
>
> I use that with qemu's '-machine virt'. Assuming you use virtio-net and
> virtio-block, no additional drivers are required.
>
> For example, I can boot a defconfig kernel using the followign QEMU options:
>
> qemu-system-aarch64 \
>         -m 2048 -smp 4 \
>         -net nic \
>         -net user,host=10.0.2.10,hostfwd=tcp::65022-:22 \
>         -nographic \
>         -no-reboot \
>         -machine virt,accel=kvm,gic_version=host \
>         -cpu host \
>         -hda ${FILESYSTEM} \
>         -snapshot \
>         -kernel ${KERNEL} \
>         -append "earlycon root=/dev/vda panic_on_warn"
>
> Thanks,
> Mark.

oh thank you so much for your information.
I was exactly looking for this option.
Let me try it on Monday.


Thanks