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Re: [Qemu-devel] [PATCH v5 7/7] block: drop support for using qcow[2] en

From: Kevin Wolf
Subject: Re: [Qemu-devel] [PATCH v5 7/7] block: drop support for using qcow[2] encryption with system emulators
Date: Fri, 18 Mar 2016 13:11:27 +0100
User-agent: Mutt/1.5.21 (2010-09-15)

Am 17.03.2016 um 18:51 hat Daniel P. Berrange geschrieben:
> For a couple of releases we have been warning
>   Encrypted images are deprecated
>   Support for them will be removed in a future release.
>   You can use 'qemu-img convert' to convert your image to an unencrypted one.
> This warning was issued by system emulators, qemu-img, qemu-nbd
> and qemu-io. Such a broad warning was issued because the original
> intention was to rip out all the code for dealing with encryption
> inside the QEMU block layer APIs.
> The new block encryption framework used for the LUKS driver does
> not rely on the unloved block layer API for encryption keys,
> instead using the QOM 'secret' object type. It is thus no longer
> appropriate to warn about encryption unconditionally.
> When the qcow/qcow2 drivers are converted to use the new encryption
> framework too, it will be practical to keep AES-CBC support present
> for use in qemu-img, qemu-io & qemu-nbd to allow for interoperability
> with older QEMU versions and liberation of data from existing encrypted
> qcow2 files.
> Thus this change, removes the deprecation warning, in its place adding
> a fatal error preventing use of qcow[2] built-in encryption inside the
> system emulators. Use of qcow[2] encryption in qemu-img, qemu-io, qemu-nbd
> no longer triggers any warning message, since that support is now expected
> to remain available long term, given the maint burden has been eliminated.
> Signed-off-by: Daniel P. Berrange <address@hidden>

Let's do this only after the qcow2 LUKS support has been merged so that
users have an alternative to switch to.


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