From: Paolo Bonzini <pbonzini@redhat.com>
To: Don Slutz <don.slutz@gmail.com>, "Michael S. Tsirkin" <mst@redhat.com>
Cc: "Markus Armbruster" <armbru@redhat.com>,
qemu-devel@nongnu.org, "Don Slutz" <dslutz@verizon.com>,
"Luiz Capitulino" <lcapitulino@redhat.com>,
"Anthony Liguori" <aliguori@amazon.com>,
"Andreas Färber" <afaerber@suse.de>,
"Richard Henderson" <rth@twiddle.net>
Subject: Re: [Qemu-devel] [PATCH v7 0/9] Add limited support of VMware's hyper-call rpc
Date: Wed, 17 Jun 2015 19:25:32 +0200 [thread overview]
Message-ID: <5581AD8C.40202@redhat.com> (raw)
In-Reply-To: <5581AAF0.3000307@redhat.com>
On 17/06/2015 19:14, Paolo Bonzini wrote:
>
>
> On 17/06/2015 19:03, Don Slutz wrote:
>> On 06/17/15 12:29, Michael S. Tsirkin wrote:
>>> On Wed, Jun 17, 2015 at 06:17:19PM +0200, Paolo Bonzini wrote:
>>>>
>>>>
>>>> On 17/06/2015 16:29, Michael S. Tsirkin wrote:
>>>>> On Wed, Jun 17, 2015 at 04:27:13PM +0200, Paolo Bonzini wrote:
>>>>>>
>>>>>>
>>>>>> On 17/06/2015 16:18, Michael S. Tsirkin wrote:
>>>>>>>>> Yes, that's what was done for parallel and pcspk as well. There's no
>>>>>>>>> infrastructure to avoid it.
>>>>>>>>>
>>>>>>>>> Paolo
>>>>>>> How do you mean? We have multiple ways to keep devices
>>>>>>> compatible with old versions.
>>>>>>> Set a new property to skip the extra stuff.
>>>>>>
>>>>>> Not if the device didn't have a vmstate at all, unfortunately.
>>>>>
>>>>> Skip creating the device completely for old machine types.
>>>>
>>>> Which device? The vmstate is tied to the same device that has always
>>>> been created.
>>>
>>> Just disable the new functionality. Make it behave in
>>> a compatible way.
>>>
>>>> we enable this thing by default (why do we?)
>>>
>>> Sigh. There is a very simple way to add a device in qemu: let user
>>> request it with -device. If one does this, one gets to maintain the
>>> resulting mess without bothering with pc maintainers in any way.
>>>
>>> But of course, everyone implementing a new feature feels it's such a
>>> great thing, and completel zero risk, it must be part of the default
>>> machine. Guess what, one then gets to bother with versioning from day 0.
>>>
>>>>>>> this seems like a big deal ...
>>>>>>
>>>>>> The PC speaker device is also enabled by default.
>>>>>
>>>>> This is historical, isn't it?
>>>>
>>>> Yes, but it has broken 2.3->2.2 migration.
>>>>
>>>> Let's just stop fighting windmills.
>>>>
>>>> Paolo
>>>
>>> I don't see what you are saying. Suddenly guest visible
>>> changes within a machine type are ok?
>>>
>>> So we have a bug, need to fix it, preferably before piling up
>>> more features. The best way imho is for 2.4 to avoid
>>> this device unless requested explicitly.
>>>
>>
>> My take on this is that Michael would like me to have a vmport_rpc=on
>> option, just like vmport=on (which already exists). With a default of off.
>
> It wouldn't be enough, because dc->vmsd would be non-NULL anyway.
>
> (But yes, that option would be a good thing anyway).
Even better would be to have a "-global vmport.rpc=no" option. It would
be simpler to disable it in existing machine types.
Paolo
next prev parent reply other threads:[~2015-06-17 17:25 UTC|newest]
Thread overview: 44+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-06-12 14:05 [Qemu-devel] [PATCH v7 0/9] Add limited support of VMware's hyper-call rpc Don Slutz
2015-06-12 14:05 ` [Qemu-devel] [BUGFIX][PATCH v7 1/9] vmport: The io memory region needs to be at least a size of 4 Don Slutz
2015-06-12 22:38 ` Eric Blake
2015-06-15 13:53 ` Don Slutz
2015-06-15 15:09 ` Eric Blake
2015-06-15 16:15 ` Don Slutz
2015-06-12 14:05 ` [Qemu-devel] [PATCH v7 2/9] vmport: Switch to trace Don Slutz
2015-06-12 14:05 ` [Qemu-devel] [BUGFIX][PATCH v7 3/9] vmport: Fix vmport_cmd_ram_size Don Slutz
2015-06-12 14:05 ` [Qemu-devel] [PATCH v7 4/9] vmport_rpc: Add the object vmport_rpc Don Slutz
2015-06-12 14:05 ` [Qemu-devel] [PATCH v7 5/9] vmport_rpc: Add limited support of VMware's hyper-call rpc Don Slutz
2015-06-12 14:05 ` [Qemu-devel] [PATCH v7 6/9] vmport_rpc: Add QMP access to vmport_rpc object Don Slutz
2015-06-15 15:53 ` Eric Blake
2015-06-17 16:42 ` Don Slutz
2015-06-12 14:05 ` [Qemu-devel] [PATCH v7 7/9] vmport_rpc: Add migration Don Slutz
2015-06-12 14:05 ` [Qemu-devel] [PATCH v7 8/9] vmport: Add VMware all ring hack Don Slutz
2015-06-12 14:05 ` [Qemu-devel] [PATCH v7 9/9] MAINTAINERS: add VMware port Don Slutz
2015-06-17 13:44 ` [Qemu-devel] [PATCH v7 0/9] Add limited support of VMware's hyper-call rpc Paolo Bonzini
2015-06-17 22:26 ` Don Slutz
2015-06-18 7:58 ` Michael S. Tsirkin
2015-06-18 8:33 ` Paolo Bonzini
2015-06-18 9:40 ` Michael S. Tsirkin
2015-06-18 8:33 ` Paolo Bonzini
2015-06-17 14:11 ` Michael S. Tsirkin
2015-06-17 14:13 ` Paolo Bonzini
2015-06-17 14:18 ` Michael S. Tsirkin
2015-06-17 14:27 ` Paolo Bonzini
2015-06-17 14:29 ` Michael S. Tsirkin
2015-06-17 16:17 ` Paolo Bonzini
2015-06-17 16:29 ` Michael S. Tsirkin
2015-06-17 16:48 ` Paolo Bonzini
2015-06-17 18:43 ` Michael S. Tsirkin
2015-06-17 19:15 ` Paolo Bonzini
2015-06-17 19:22 ` Michael S. Tsirkin
2015-06-17 19:24 ` Paolo Bonzini
2015-06-17 19:29 ` Michael S. Tsirkin
2015-06-17 17:03 ` Don Slutz
2015-06-17 17:14 ` Paolo Bonzini
2015-06-17 17:25 ` Paolo Bonzini [this message]
2015-06-17 17:34 ` Don Slutz
2015-06-17 18:58 ` Michael S. Tsirkin
2015-06-18 18:40 ` Don Slutz
2015-06-17 18:45 ` Michael S. Tsirkin
2015-06-17 18:45 ` Michael S. Tsirkin
2015-06-18 7:03 ` Gerd Hoffmann
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