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

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Message-ID: <CAOJsxLE5PxhqC5DfHOqgoSXbUOPcHZUKL5QUSGL1fuEkYp26YQ@mail.gmail.com>
Date:	Tue, 8 Nov 2011 17:26:03 +0200
From:	Pekka Enberg <penberg@...nel.org>
To:	Christoph Hellwig <hch@...radead.org>
Cc:	Avi Kivity <avi@...hat.com>, 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>,
	"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 8, 2011 at 4:52 PM, Christoph Hellwig <hch@...radead.org> wrote:
> 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.

It's rootfs binaries that are shared, not configuration. It's
unfortunate but works OK for the single user use case it's meant for.
It's obviously not a proper solution for the generic case. We were
hoping that we could use something like overlayfs to hide the issue
under the rug. Do you think that's also a really dumb thing to do?

Using block device snapshotting would be interesting and we should
definitely look into that.

                                Pekka
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