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Mon, 19 Feb 2024 14:24:12 +0000 (UTC) Received: from blackfin.pond.sub.org (unknown [10.39.192.55]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 0085D1C060AF; Mon, 19 Feb 2024 14:24:11 +0000 (UTC) Received: by blackfin.pond.sub.org (Postfix, from userid 1000) id B9FA521E66D0; Mon, 19 Feb 2024 15:24:04 +0100 (CET) From: Markus Armbruster To: yong.huang@smartx.com Cc: qemu-devel@nongnu.org, Daniel P . =?utf-8?Q?Berrang=C3=A9?= , Eric Blake , Markus Armbruster , Hanna Reitz , Kevin Wolf Subject: Re: [PATCH v4 4/7] block: Support detached LUKS header creation using blockdev-create In-Reply-To: <9e35e621f12478822072e5c740ed65beb77f1238.1706586786.git.yong.huang@smartx.com> (yong huang's message of "Tue, 30 Jan 2024 13:37:22 +0800") References: <9e35e621f12478822072e5c740ed65beb77f1238.1706586786.git.yong.huang@smartx.com> Date: Mon, 19 Feb 2024 15:24:04 +0100 Message-ID: <87v86kjzwb.fsf@pond.sub.org> User-Agent: Gnus/5.13 (Gnus v5.13) MIME-Version: 1.0 Content-Type: text/plain X-Scanned-By: MIMEDefang 3.4.1 on 10.11.54.7 Received-SPF: pass client-ip=170.10.129.124; envelope-from=armbru@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -21 X-Spam_score: -2.2 X-Spam_bar: -- X-Spam_report: (-2.2 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.072, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H2=-0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org yong.huang@smartx.com writes: > From: Hyman Huang > > Firstly, enable the ability to choose the block device containing > a detachable LUKS header by adding the 'header' parameter to > BlockdevCreateOptionsLUKS. > > Secondly, when formatting the LUKS volume with a detachable header, > truncate the payload volume to length without a header size. > > Using the qmp blockdev command, create the LUKS volume with a > detachable header as follows: > > 1. add the secret to lock/unlock the cipher stored in the > detached LUKS header > $ virsh qemu-monitor-command vm '{"execute":"object-add", >> "arguments":{"qom-type": "secret", "id": "sec0", "data": "foo"}}' > > 2. create a header img with 0 size > $ virsh qemu-monitor-command vm '{"execute":"blockdev-create", >> "arguments":{"job-id":"job0", "options":{"driver":"file", >> "filename":"/path/to/detached_luks_header.img", "size":0 }}}' > > 3. add protocol blockdev node for header > $ virsh qemu-monitor-command vm '{"execute":"blockdev-add", >> "arguments": {"driver":"file", "filename": >> "/path/to/detached_luks_header.img", "node-name": >> "detached-luks-header-storage"}}' > > 4. create a payload img with 0 size > $ virsh qemu-monitor-command vm '{"execute":"blockdev-create", >> "arguments":{"job-id":"job1", "options":{"driver":"file", >> "filename":"/path/to/detached_luks_payload_raw.img", "size":0}}}' > > 5. add protocol blockdev node for payload > $ virsh qemu-monitor-command vm '{"execute":"blockdev-add", >> "arguments": {"driver":"file", "filename": >> "/path/to/detached_luks_payload_raw.img", "node-name": >> "luks-payload-raw-storage"}}' > > 6. do the formatting with 128M size > $ virsh qemu-monitor-command c81_node1 '{"execute":"blockdev-create", >> "arguments":{"job-id":"job2", "options":{"driver":"luks", "header": >> "detached-luks-header-storage", "file":"luks-payload-raw-storage", >> "size":134217728, "preallocation":"full", "key-secret":"sec0" }}}' > > Signed-off-by: Hyman Huang > --- [...] > diff --git a/qapi/block-core.json b/qapi/block-core.json > index 69a88d613d..eab15d7dd9 100644 > --- a/qapi/block-core.json > +++ b/qapi/block-core.json > @@ -4960,6 +4960,8 @@ > # @file: Node to create the image format on, mandatory except when > # 'preallocation' is not requested > # > +# @header: Block device holding a detached LUKS header. (since 9.0) > +# Behavior when @header is present vs. behavior when it's absent? > # @size: Size of the virtual disk in bytes > # > # @preallocation: Preallocation mode for the new image (since: 4.2) > @@ -4970,6 +4972,7 @@ > { 'struct': 'BlockdevCreateOptionsLUKS', > 'base': 'QCryptoBlockCreateOptionsLUKS', > 'data': { '*file': 'BlockdevRef', > + '*header': 'BlockdevRef', > 'size': 'size', > '*preallocation': 'PreallocMode' } }