Re: [libvirt] [PATCH v4] qemu: Use heads parameter for QXL driver

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On Fri, Jul 17, 2015 at 06:02:25PM +0200, Christophe Fergeau wrote:
On Fri, Jul 17, 2015 at 03:42:36PM +0200, Martin Kletzander wrote:
On Fri, Jul 17, 2015 at 12:11:55PM +0200, Peter Krempa wrote:
>On Fri, Jul 17, 2015 at 09:29:44 +0100, Frediano Ziglio wrote:
>>Allows to specify maximum number of head to QXL driver.
>>
>>Actually can be a compatiblity problem as heads in the XML configuration
>>was set by default to '1'.
>>
>>Signed-off-by: Frediano Ziglio <fziglio@xxxxxxxxxx>
>>---
>> src/qemu/qemu_capabilities.c                       |  2 ++
>> src/qemu/qemu_capabilities.h                       |  1 +
>> src/qemu/qemu_command.c                            |  5 ++++
>> .../qemuxml2argv-video-qxl-device-max-outputs.args |  7 ++++++
>> .../qemuxml2argv-video-qxl-device-max-outputs.xml  | 29 ++++++++++++++++++++++
>> tests/qemuxml2argvtest.c                           |  3 +++
>> 6 files changed, 47 insertions(+)
>> create mode 100644 tests/qemuxml2argvdata/qemuxml2argv-video-qxl-device-max-outputs.args
>> create mode 100644 tests/qemuxml2argvdata/qemuxml2argv-video-qxl-device-max-outputs.xml
>>
>>Changes from v4:
>>- rebased on new master;
>>- add test case to qemuxml2argvtest.
>
>Note review: This was added in qemu commit
>http://git.qemu.org/?p=qemu.git;a=commitdiff;h=567161fdd47aeb6987e700702f6bbfef04ae0236
>
>The commit hints that you need at least spice 0.12.6. I'll update spice
>and test this later.

I failed to update qemu without updating spice as well, so I'd say
it is safe to assume that if qemu supports it, spice will too.  And we
don't check all the lib versions for qemu runtime, that'd be a waste
of time, so this is quite alright, I think.

I updated everything spice-related and I still can't properly build
qemu particularly because of the patch you mentioned.  And I update
everything from git.  Then I looked there and I see no such function,
no wonder the build fails with undefined reference to
spice_qxl_set_monitors_config_limit.  Although that would mean that it

qemu tries to call spice_qxl_set_monitors_config_limit but the entry
point ended up being called spice_qxl_set_max_monitors in spice-server
:-/


I spend all morning fixing this to be installed properly in the
system.  Anyway, I finally managed to make this work and found out the
guest I used for it is not ready to have multiple monitors.  Anyway,
looking at everything else this definitely works, so ACK, I'll push it
in a while.

In the meantime, is the only thing this does limiting the maximum?  Is
it there just to save some memory or why?  Because otherwise I can't
see the use-case in that.  I'm not saying there isn't one, just that I
can't find it.  And I even looked under the fridge :)

Have a nice day,
Martin

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