linux-kernel - Re: [Qemu-devel] [PATCH] KVM: Add wrapper script around QEMU to test kernels

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Date:	Sun, 06 Nov 2011 02:14:40 +0100
From:	Andreas Färber <afaerber@...e.de>
To:	Alexander Graf <agraf@...e.de>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Blue Swirl <blauwirbel@...il.com>,
	"kvm@...r.kernel.org list" <kvm@...r.kernel.org>,
	qemu-devel Developers <qemu-devel@...gnu.org>,
	"linux-kernel@...r.kernel.org List" <linux-kernel@...r.kernel.org>,
	Pekka Enberg <penberg@...nel.org>, Avi Kivity <avi@...hat.com>,
	Américo Wang <xiyou.wangcong@...il.com>,
	Ingo Molnar <mingo@...e.hu>
Subject: Re: [Qemu-devel] [PATCH] KVM: Add wrapper script around QEMU to test
 kernels

Am 06.11.2011 02:35, schrieb Alexander Graf:
> On LinuxCon I had a nice chat with Linus on what he thinks kvm-tool
> would be doing and what he expects from it. Basically he wants a
> small and simple tool he and other developers can run to try out and
> see if the kernel they just built actually works.
> 
> Fortunately, QEMU can do that today already! The only piece that was
> missing was the "simple" piece of the equation, so here is a script
> that wraps around QEMU and executes a kernel you just built.
> 
> If you do have KVM around and are not cross-compiling, it will use
> KVM. But if you don't, you can still fall back to emulation mode and
> at least check if your kernel still does what you expect. I only
> implemented support for s390x and ppc there, but it's easily extensible
> to more platforms, as QEMU can emulate (and virtualize) pretty much
> any platform out there.
> 
> If you don't have qemu installed, please do so before using this script. Your
> distro should provide a package for it (might even call it "kvm"). If not,
> just compile it from source - it's not hard!
> 
> To quickly get going, just execute the following as user:
> 
>     $ ./Documentation/run-qemu.sh -r / -a init=/bin/bash

Path needs updating.

> 
> This will drop you into a shell on your rootfs.
> 
> Happy hacking!
> 
> Signed-off-by: Alexander Graf <agraf@...e.de>
> 
> ---

> diff --git a/tools/testing/run-qemu/run-qemu.sh b/tools/testing/run-qemu/run-qemu.sh
> new file mode 100755
> index 0000000..70f194f
> --- /dev/null
> +++ b/tools/testing/run-qemu/run-qemu.sh

> +# Try to find the KVM accelerated QEMU binary
> +
> +[ "$ARCH" ] || ARCH=$(uname -m)
> +case $ARCH in
> +x86_64)
> +	KERNEL_BIN=arch/x86/boot/bzImage
> +	# SUSE and Red Hat call the binary qemu-kvm
> +	[ "$QEMU_BIN" ] || QEMU_BIN=$(which qemu-kvm 2>/dev/null)
> +
> +	# Debian and Gentoo call it kvm
> +	[ "$QEMU_BIN" ] || QEMU_BIN=$(which kvm 2>/dev/null)
> +
> +	# QEMU's own build system calls it qemu-system-x86_64
> +	[ "$QEMU_BIN" ] || QEMU_BIN=$(which qemu-system-x86_64 2>/dev/null)
> +	;;
> +i*86)
> +	KERNEL_BIN=arch/x86/boot/bzImage
> +	# SUSE and Red Hat call the binary qemu-kvm
> +	[ "$QEMU_BIN" ] || QEMU_BIN=$(which qemu-kvm 2>/dev/null)
> +
> +	# Debian and Gentoo call it kvm
> +	[ "$QEMU_BIN" ] || QEMU_BIN=$(which kvm 2>/dev/null)
> +
> +	KERNEL_BIN=arch/x86/boot/bzImage

Copy&paste?

> +	# i386 version of QEMU

QEMU's own build system calls it qemu-system-i386 now. :)

> +	[ "$QEMU_BIN" ] || QEMU_BIN=$(which qemu 2>/dev/null)

We should first test for qemu-system-i386, then fall back to old qemu.

Andreas

P.S. You're still ahead of time...


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