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Re: [Qemu-devel] [RFC PATCH 4/4] qemu-options: Do not show -enable-kvm a
From: |
Thomas Huth |
Subject: |
Re: [Qemu-devel] [RFC PATCH 4/4] qemu-options: Do not show -enable-kvm and -enable-hax in the docs anymore |
Date: |
Wed, 13 Jun 2018 17:11:51 +0200 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.8.0 |
On 13.06.2018 15:44, Daniel P. Berrangé wrote:
> On Wed, Jun 13, 2018 at 02:38:40PM +0100, Stefan Hajnoczi wrote:
>> On Wed, Jun 13, 2018 at 07:05:21AM +0200, Thomas Huth wrote:
>>> We've got three ways of enabling an accelerator: -machine accel=xyz,
>>> -accel xyz and -enable-xyz. For new QEMU users, this must be very
>>> confusing ("Which one do I have to use? Is there a difference between
>>> the options?"). While -enable-kvm was useful in the past, there is no
>>> real good reason for using it anymore today ("-accel kvm" is even less
>>> to type than "-enable-kvm"), so let's decrease the confusing amount of
>>> options in our documenation a little bit by removing the -enable-xyz
>>> here. Note that the option itself is neither removed nor marked as
>>> deprecated - since -enable-kvm is likely used in a lot of scripts and
>>> since its code is easy to maintain, we should keep it around to avoid
>>> to break old setups.
>>>
>>> Signed-off-by: Thomas Huth <address@hidden>
>>> ---
>>> PS: I guess Paolo won't like this patch ... let's try it anyway ;-)
>>
>> It's widely used and we're removing the documentation for it?! That is
>> likely to cause issues for new users who refer to the man page to
>> understand the QEMU command-lines they see online, in scripts, etc.
>
> Agreed, this is a very bad idea. Any option that is accepted by QEMU,
> but not documented is a bug that must be fixed. IOW removing docs
> is creating bugs.
Not documenting unliked options that are still kept for compatibility
was at least a common practice in the past (see -no-kvm for example, or
many of those deprecated options like -net channel that have been
removed in the past year).
> If we want to help users understand why we have -enable-kvm, just
> make the docs say that it is syntactic for '-machine accel=kvm'.
> Users can decide for themselves whether they want to switch to
> the more verbose way or not
Uh, well, in this case "-enable-kvm" is already the more verbose way:
"-accel kvm" is shorter :-)
It's just a big mess: We've got -enable-kvm, -enable-hax, but there is
no -enable-hvf, -enable-whpx or -enable-xen option. And to force TCG
mode, you've got to use -no-kvm ... honestly, if I were a new user, I'd
simply say: WTF!?!
But ok, since -enable-kvm has such a big tradition and is used in a lot
of examples out there, it's likely really better if we keep it in the
documentation. But we should either move it to a "obsolete option"
chapter, or update the current documentation with some words like
"obsolete" or "legacy" (to make it clear that nobody gets the idea of
introducing -enable-hvf or other similar options in the future).
And what about -enable-hax? That hardly has any tradtion. Should we
maybe even deprecate it?
Thomas
- Re: [Qemu-devel] [PATCH 1/4] Replace '-machine accel=xyz' with '-accel xyz', (continued)
- [Qemu-devel] [PATCH 2/4] Replace '-enable-kvm' with '-accel kvm' in docs and help texts, Thomas Huth, 2018/06/13
- [Qemu-devel] [PATCH 3/4] qemu-options: Improve the documentation of '-accel' and '-machine accel=...', Thomas Huth, 2018/06/13
- [Qemu-devel] [RFC PATCH 4/4] qemu-options: Do not show -enable-kvm and -enable-hax in the docs anymore, Thomas Huth, 2018/06/13
- Re: [Qemu-devel] [RFC PATCH 4/4] qemu-options: Do not show -enable-kvm and -enable-hax in the docs anymore, Paolo Bonzini, 2018/06/13
- Re: [Qemu-devel] [RFC PATCH 4/4] qemu-options: Do not show -enable-kvm and -enable-hax in the docs anymore, Stefan Hajnoczi, 2018/06/13
- Re: [Qemu-devel] [RFC PATCH 4/4] qemu-options: Do not show -enable-kvm and -enable-hax in the docs anymore, Daniel P . Berrangé, 2018/06/13
- Re: [Qemu-devel] [RFC PATCH 4/4] qemu-options: Do not show -enable-kvm and -enable-hax in the docs anymore,
Thomas Huth <=
- Re: [Qemu-devel] [RFC PATCH 4/4] qemu-options: Do not show -enable-kvm and -enable-hax in the docs anymore, Daniel P . Berrangé, 2018/06/13
- Re: [Qemu-devel] [RFC PATCH 4/4] qemu-options: Do not show -enable-kvm and -enable-hax in the docs anymore, Thomas Huth, 2018/06/13
- Re: [Qemu-devel] [RFC PATCH 4/4] qemu-options: Do not show -enable-kvm and -enable-hax in the docs anymore, Markus Armbruster, 2018/06/13
- Re: [Qemu-devel] [RFC PATCH 4/4] qemu-options: Do not show -enable-kvm and -enable-hax in the docs anymore, Cornelia Huck, 2018/06/19
- Re: [Qemu-devel] [RFC PATCH 4/4] qemu-options: Do not show -enable-kvm and -enable-hax in the docs anymore, Paolo Bonzini, 2018/06/19
- Re: [Qemu-devel] [RFC PATCH 4/4] qemu-options: Do not show -enable-kvm and -enable-hax in the docs anymore, Eduardo Habkost, 2018/06/22
- Re: [Qemu-devel] [RFC PATCH 4/4] qemu-options: Do not show -enable-kvm and -enable-hax in the docs anymore, Thomas Huth, 2018/06/22
- Re: [Qemu-devel] [RFC PATCH 4/4] qemu-options: Do not show -enable-kvm and -enable-hax in the docs anymore, Eduardo Habkost, 2018/06/22
- Re: [Qemu-devel] [RFC PATCH 4/4] qemu-options: Do not show -enable-kvm and -enable-hax in the docs anymore, Paolo Bonzini, 2018/06/22
- Re: [Qemu-devel] [RFC PATCH 4/4] qemu-options: Do not show -enable-kvm and -enable-hax in the docs anymore, Markus Armbruster, 2018/06/25