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From: Maxim Levitsky <mlevitsk@redhat.com>
To: Eric Blake <eblake@redhat.com>,
	Markus Armbruster <armbru@redhat.com>,
	 Kevin Wolf <kwolf@redhat.com>
Cc: "Fam Zheng" <fam@euphon.net>,
	"Daniel P.Berrangé" <berrange@redhat.com>,
	qemu-block@nongnu.org, qemu-devel@nongnu.org,
	"Max Reitz" <mreitz@redhat.com>,
	"Stefan Hajnoczi" <stefanha@redhat.com>
Subject: Re: [Qemu-devel] [PATCH 00/13] RFC: luks/encrypted qcow2 key management
Date: Mon, 19 Aug 2019 15:35:44 +0300
Message-ID: <ba8e9afd066d65099a897b5c515a73ab2c64625d.camel@redhat.com> (raw)
In-Reply-To: <414e8dab-b19b-fd47-52eb-db43ae75ec07@redhat.com>

On Thu, 2019-08-15 at 10:00 -0500, Eric Blake wrote:
> On 8/15/19 9:44 AM, Maxim Levitsky wrote:
> 
> > > > > Does the idea of a union type with a default value for the discriminator
> > > > > help?  Maybe we have a discriminator which defaults to 'auto', and add a
> > > > > union branch 'auto':'any'.  During creation, if the "driver":"auto"
> > > > > branch is selected (usually implicitly by omitting "driver", but also
> > > > > possible explicitly), the creation attempt is rejected as invalid
> > > > > regardless of the contents of the remaining 'any'.  But during amend
> > > > > usage, if the 'auto' branch is selected, we then add in the proper
> > > > > "driver":"xyz" and reparse the QAPI object to determine if the remaining
> > > > > fields in 'any' still meet the specification for the required driver branch.
> > > > > 
> > > > > This idea may still require some tweaks to the QAPI generator, but it's
> > > > > the best I can come up with for a way to parse an arbitrary JSON object
> > > > > with unknown validation, then reparse it again after adding more
> > > > > information that would constrain the parse differently.
> > > > 
> > > > Feels like this would be a lot of code just to allow the client to omit
> > > > passing a value that it knows anyway. If this were a human interface, I
> > > > could understand the desire to make commands less verbose, but for QMP I
> > > > honestly don't see the point when it's not trivial.
> > > 
> > > Seconded.
> > 
> > 
> > But what about my suggestion of adding something like:
> > 
> > { 'union': 'BlockdevAmendOptions',
> > 
> >   'base': {
> >       'node-name':         'str' },
> > 
> >   'discriminator': { 'get_block_driver(node-name)' } ,
> 
> Not worth it. It makes the QAPI generator more complex (to invoke
> arbitrary code instead of a fixed name) just to avoid a little bit of
> complexity in the caller (which is assumed to be a computer, and thus
> shouldn't have a hard time providing a sane 'driver' unconditionally).
> An HMP wrapper around the QMP command can do whatever magic it needs to
> omit driver, but making driver mandatory for QMP is just fine.

All right! I kind of not agree with that, since I think even though QMP is a machine language,
it still should be consistent since humans still use it, even if this is humans that code some
tool that use it.

I won't argue with you though, let it be like that.

Best regards,
	Maxim Levitsky

> 




  reply index

Thread overview: 87+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-08-14 20:22 Maxim Levitsky
2019-08-14 20:22 ` [Qemu-devel] [PATCH 01/13] block-crypto: misc refactoring Maxim Levitsky
2019-08-20 16:38   ` Max Reitz
2019-08-22  0:05     ` Maxim Levitsky
2019-08-22 14:34       ` Max Reitz
2019-08-22 15:04         ` Maxim Levitsky
2019-08-21 15:39   ` Daniel P. Berrangé
2019-08-22  0:08     ` Maxim Levitsky
2019-08-14 20:22 ` [Qemu-devel] [PATCH 02/13] qcrypto-luks: " Maxim Levitsky
2019-08-15 21:40   ` [Qemu-devel] [Qemu-block] " John Snow
2019-08-19 14:21     ` Maxim Levitsky
2019-08-22 10:29     ` Daniel P. Berrangé
2019-08-22 11:04       ` Maxim Levitsky
2019-08-22 11:10         ` Daniel P. Berrangé
2019-08-22 11:13           ` Maxim Levitsky
2019-08-20 17:36   ` [Qemu-devel] " Max Reitz
2019-08-21 23:59     ` Maxim Levitsky
2019-08-22 14:32       ` Max Reitz
2019-08-25 10:46         ` Maxim Levitsky
2019-08-14 20:22 ` [Qemu-devel] [PATCH 03/13] qcrypto-luks: refactoring: extract load/store/check/parse header functions Maxim Levitsky
2019-08-20 18:01   ` Max Reitz
2019-08-21 22:43     ` Maxim Levitsky
2019-08-22 10:32       ` Daniel P. Berrangé
2019-08-22 10:57         ` Maxim Levitsky
2019-08-22 10:34       ` Daniel P. Berrangé
2019-08-25 14:11         ` Maxim Levitsky
2019-08-22 10:38   ` Daniel P. Berrangé
2019-08-25 14:09     ` Maxim Levitsky
2019-08-14 20:22 ` [Qemu-devel] [PATCH 04/13] qcrypto-luks: refactoring: simplify the math used for keyslot locations Maxim Levitsky
2019-08-22 10:47   ` Daniel P. Berrangé
2019-08-25 14:30     ` Maxim Levitsky
2019-08-14 20:22 ` [Qemu-devel] [PATCH 05/13] qcrypto-luks: clear the masterkey and password before freeing them always Maxim Levitsky
2019-08-20 18:12   ` Max Reitz
2019-08-21 22:40     ` Maxim Levitsky
2019-08-22 10:49     ` Daniel P. Berrangé
2019-08-22 10:56       ` Maxim Levitsky
2019-08-25 15:31         ` Maxim Levitsky
2019-08-25 17:15           ` Maxim Levitsky
2019-08-27  8:55           ` Daniel P. Berrangé
2019-08-21 23:01   ` [Qemu-devel] [Qemu-block] " Nir Soffer
2019-08-21 23:11     ` Maxim Levitsky
2019-08-14 20:22 ` [Qemu-devel] [PATCH 06/13] qcrypto-luks: implement more rigorous header checking Maxim Levitsky
2019-08-22 11:04   ` Daniel P. Berrangé
2019-08-25 15:40     ` Maxim Levitsky
2019-08-25 16:08       ` Maxim Levitsky
2019-08-26 13:31         ` Eric Blake
2019-08-26 13:39           ` Maxim Levitsky
2019-08-27  8:56         ` Daniel P. Berrangé
2019-08-14 20:22 ` [Qemu-devel] [PATCH 07/13] block: add manage-encryption command (qmp and blockdev) Maxim Levitsky
2019-08-20 18:27   ` Max Reitz
2019-08-21 22:32     ` Maxim Levitsky
2019-08-22 11:14     ` Daniel P. Berrangé
2019-08-21 11:47   ` Markus Armbruster
2019-08-21 22:24     ` Maxim Levitsky
2019-08-22 14:07       ` Markus Armbruster
2019-08-25 16:42         ` Maxim Levitsky
2019-08-14 20:22 ` [Qemu-devel] [PATCH 08/13] qcrypto: add the plumbing for encryption management Maxim Levitsky
2019-08-22 11:16   ` Daniel P. Berrangé
2019-08-22 11:47     ` Maxim Levitsky
2019-08-22 11:49       ` Daniel P. Berrangé
2019-08-14 20:22 ` [Qemu-devel] [PATCH 09/13] qcrypto-luks: implement the encryption key management Maxim Levitsky
2019-08-22 11:27   ` Daniel P. Berrangé
2019-08-25 17:01     ` Maxim Levitsky
2019-08-14 20:22 ` [Qemu-devel] [PATCH 10/13] block/crypto: " Maxim Levitsky
2019-08-22 11:29   ` Daniel P. Berrangé
2019-08-22 11:36     ` Maxim Levitsky
2019-08-14 20:22 ` [Qemu-devel] [PATCH 11/13] block/qcow2: implement the encryption key managment Maxim Levitsky
2019-08-14 20:22 ` [Qemu-devel] [PATCH 12/13] qemu-img: implement key management Maxim Levitsky
2019-08-20 18:29   ` Max Reitz
2019-08-21 22:33     ` Maxim Levitsky
2019-08-22 11:32     ` Daniel P. Berrangé
2019-08-22 14:42       ` Max Reitz
2019-08-25 17:04         ` Maxim Levitsky
2019-08-14 20:22 ` [Qemu-devel] [PATCH 13/13] iotests : add tests for encryption " Maxim Levitsky
2019-08-14 21:08 ` [Qemu-devel] [PATCH 00/13] RFC: luks/encrypted qcow2 " Eric Blake
2019-08-15  8:49   ` Maxim Levitsky
2019-08-15  9:10   ` Kevin Wolf
2019-08-15 14:18     ` Markus Armbruster
2019-08-15 14:44       ` Maxim Levitsky
2019-08-15 15:00         ` Eric Blake
2019-08-19 12:35           ` Maxim Levitsky [this message]
2019-08-21 11:31             ` Markus Armbruster
2019-08-21 13:22               ` Maxim Levitsky
2019-08-20 17:59 ` Max Reitz
2019-08-21 22:00   ` Maxim Levitsky
2019-08-22 11:35 ` Daniel P. Berrangé
2019-08-25 17:10   ` Maxim Levitsky

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