[libvirt] [PATCH 0/7] Drop support for QEMU < 0.12.0

[Daniel P. Berrange]

On Thu, Nov 05, 2015 at 05:33:52PM +0000, Daniel P. Berrange wrote:
> The patches for introducing virtlogd will be significantly
> simplified if we don't need to worry about parsing stderr
> during startup. This is required prior to QEMU 0.11 so
> that we can get the dyanamically allocated /dev/pty/NNN
> paths.
> 
> The QEMU 0.12.1 release was shipped in RHEL-6 vintage
> distros and is already quite old, so seems like a fair
> target version to aim for as the minimum required.
> 
> By dropping support for anything older than QEMU 0.12.0
> we can remove the code for parsing stderr. The QEMU 0.12.0
> release was quite special because it was the release where
> QEMU switched what I call its "modern" approach to configuration
> via -device. A major part of the complexity of the QEMU command
> line generator is due to need to support non-device syntax,
> so by mandating QEMU 0.12.0 we'll be able to kill off alot
> of conditional code. This series makes a start by assuming
> existance of 5 features, -vnc, 'info chardev', -no-reboot,
> -drive and -name, but there are a tonne more we can assume.
> 
> Looking at tests/qemuhelptest, we can drop about 30 capability
> flag tests
> 
>             QEMU_CAPS_UUID,
>             QEMU_CAPS_MIGRATE_QEMU_TCP,
>             QEMU_CAPS_MIGRATE_QEMU_EXEC,
>             QEMU_CAPS_DRIVE_CACHE_V2,
>             QEMU_CAPS_DRIVE_FORMAT,
>             QEMU_CAPS_DRIVE_SERIAL,
>             QEMU_CAPS_DRIVE_READONLY,
>             QEMU_CAPS_VGA,
>             QEMU_CAPS_0_10,
>             QEMU_CAPS_ENABLE_KVM,
>             QEMU_CAPS_SDL,
>             QEMU_CAPS_XEN_DOMID,
>             QEMU_CAPS_MIGRATE_QEMU_UNIX,
>             QEMU_CAPS_CHARDEV,
>             QEMU_CAPS_BALLOON,
>             QEMU_CAPS_DEVICE,
>             QEMU_CAPS_SMP_TOPOLOGY,
>             QEMU_CAPS_RTC,
>             QEMU_CAPS_NO_HPET,
>             QEMU_CAPS_BOOT_MENU,
>             QEMU_CAPS_NAME_PROCESS,
>             QEMU_CAPS_SMBIOS_TYPE,
>             QEMU_CAPS_VGA_NONE,
>             QEMU_CAPS_MIGRATE_QEMU_FD,
>             QEMU_CAPS_DRIVE_AIO,
>             QEMU_CAPS_NO_SHUTDOWN,
>             QEMU_CAPS_PCI_ROMBAR,
>             QEMU_CAPS_NO_ACPI,
>             QEMU_CAPS_VIRTIO_BLK_SG_IO,
>             QEMU_CAPS_CPU_HOST,
>             QEMU_CAPS_VNC
> 
> The only slow complication is that some non-x86 architectures
> were slow in converting to -device syntax, so we cannot
> entirely assume -device is used everywhere.

I'm going to rebase this series on top of

  https://www.redhat.com/archives/libvir-list/2015-November/msg00210.html

as it is proving far too horrific to modify the existing
.args files to add new args, while keeping the line wrapping
sane.

Regards,
Daniel
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