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

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Message-ID: <20111108145257.GA10846@infradead.org>
Date:	Tue, 8 Nov 2011 09:52:57 -0500
From:	Christoph Hellwig <hch@...radead.org>
To:	Avi Kivity <avi@...hat.com>
Cc:	Alexander Graf <agraf@...e.de>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>,
	"linux-kernel@...r.kernel.org List" <linux-kernel@...r.kernel.org>,
	"kvm@...r.kernel.org list" <kvm@...r.kernel.org>,
	qemu-devel Developers <qemu-devel@...gnu.org>,
	Pekka Enberg <penberg@...nel.org>,
	Am?rico Wang <xiyou.wangcong@...il.com>,
	Blue Swirl <blauwirbel@...il.com>
Subject: Re: [PATCH] KVM: Add wrapper script around QEMU to test kernels

On Tue, Nov 08, 2011 at 04:41:40PM +0200, Avi Kivity wrote:
> On 11/06/2011 03:35 AM, Alexander Graf wrote:
> > To quickly get going, just execute the following as user:
> >
> >     $ ./Documentation/run-qemu.sh -r / -a init=/bin/bash
> >
> > This will drop you into a shell on your rootfs.
> >
> 
> Doesn't work on Fedora 15.  F15's qemu-kvm doesn't have -machine or
> -virtfs.  Even qemu.git on F15 won't build virtfs since xattr.h
> detection is broken (patch posted).

Nevermind that running virtfs as a rootfs is a really dumb idea.  You
do now want to run a VM that has a rootfs that gets changed all the
time behind your back.

Running qemu -snapshot on the actual root block device is the only
safe way to reuse the host installation, although it gets a bit
complicated if people have multiple devices mounted into the namespace.

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