linux-kernel - Re: [RFC/GIT PULL] Linux KVM tool for v3.2

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Message-ID: <m3fwhws6ci.fsf@blackfin.pond.sub.org>
Date:	Thu, 10 Nov 2011 09:57:01 +0100
From:	Markus Armbruster <armbru@...hat.com>
To:	Sasha Levin <levinsasha928@...il.com>
Cc:	Pekka Enberg <penberg@...nel.org>,
	Anthony Liguori <anthony@...emonkey.ws>,
	Pekka Enberg <penberg@...helsinki.fi>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Avi Kivity <avi@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>, linux-kernel@...r.kernel.org,
	kvm@...r.kernel.org, Christoph Hellwig <hch@....de>
Subject: Re: [RFC/GIT PULL] Linux KVM tool for v3.2

Sasha Levin <levinsasha928@...il.com> writes:

> On Thu, Nov 10, 2011 at 9:57 AM, Markus Armbruster <armbru@...hat.com> wrote:
[...]
>> Start with a clean read/write raw image.  Probing declares it raw.
>> Guest writes QCOW signature to it, with a backing file of its choice.
>>
>> Restart with the same image.  Probing declares it QCOW2.  Guest can read
>> the backing file.  Oops.
>
> Thats an excellent scenario why you'd want to have 'Secure KVM' with
> seccomp filters :)

Yup.

For what it's worth, sVirt (use SELinux to secure virtualization)
mitigates the problem.  Doesn't mean we couldn't use "Secure KVM".

> I'm actually not sure why KVM tool got QCOW support in the first
> place. You can have anything QCOW provides if you use btrfs (among
> several other FSs).

Maybe it's just me, but isn't it weird to have a filesystem (QCOW2)
sitting in the kernel sources that you can't mount(2)?
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