ChangeLog/2.4: Difference between revisions
| Line 1: | Line 1: | ||
== System emulation == | == System emulation == | ||
=== Command-line compatibility === | === Command-line compatibility === | ||
* Behavior when the three SMP topology options (socket, cores, threads) are specified but don't match the number of VCPUs was changed. In previous versions QEMU silently adjusted the "threads" option to (try to) make the topology match the number of VCPUs, now QEMU will abort when sockets*cores*threads don't match the number of VCPUs. | |||
=== Future incompatible changes === | === Future incompatible changes === | ||
* Three options are using different names on the command line and in configuration file. In particular: | |||
** The "acpi" configuration file section matches command-line option "acpitable"; | |||
** The "boot-opts" configuration file section matches command-line option "boot"; | |||
** The "smp-opts" configuration file section matches command-line option "smp". | |||
:-readconfig will standardize on the name for the command line option. | |||
* Behavior of automatic calculation of SMP topology when some SMP topology options for -smp are omitted (sockets, cores, threads) will change in the future. If guest ABI needs to be preserved on upgrades while using the SMP topology options, users should either set set all options explicitly (sockets, cores, threads), or omit all of them. | |||
* Image encryption is fatally flawed, and will be dropped entirely. It'll remain available only in qemu-img, so you can use 'qemu-img convert' to convert encrypted images to uncrypted ones. | |||
* Host floppy device pass-through (block driver "host_floppy") is deprecated, and will be dropped in a future release. | |||
* Block device parameter aio=native has no effect without cache.direct=on. It will be made an error. | |||
* A few devices will be configured with explicit properties instead of implicitly. Unlikely to affect users; for the full list, see the 2.3 ChangeLog. | |||
* QMP command blockdev-add is still a work in progress. It doesn't support all block drivers, it lacks a matching blockdev-del, and more. It might change incompatibly. | |||
=== ARM === | === ARM === | ||
==== KVM ==== | |||
=== MIPS === | === MIPS === | ||
=== PowerPC === | === PowerPC === | ||
==== IBM (pSeries) ==== | |||
==== Freescale (BookE) ==== | |||
==== PReP ==== | |||
=== s390 === | === s390 === | ||
=== SPARC === | === SPARC === | ||
=== TriCore === | === TriCore === | ||
=== x86 === | === x86 === | ||
==== KVM ==== | |||
==== Xen ==== | |||
=== Device emulation and assignment === | === Device emulation and assignment === | ||
==== ACPI ==== | ==== ACPI ==== | ||
| Line 24: | Line 35: | ||
==== SCSI ==== | ==== SCSI ==== | ||
==== PCI/PCIe ==== | ==== PCI/PCIe ==== | ||
==== USB ==== | ==== USB ==== | ||
==== VFIO ==== | ==== VFIO ==== | ||
==== VGA ==== | ==== VGA ==== | ||
=== Character devices === | === Character devices === | ||
=== GUI === | === GUI === | ||
| Line 35: | Line 44: | ||
=== Network === | === Network === | ||
=== Block devices in system emulation === | === Block devices in system emulation === | ||
== Block devices and tools == | == Block devices and tools == | ||
== TCG == | == TCG == | ||
Revision as of 10:05, 27 May 2015
System emulation
Command-line compatibility
- Behavior when the three SMP topology options (socket, cores, threads) are specified but don't match the number of VCPUs was changed. In previous versions QEMU silently adjusted the "threads" option to (try to) make the topology match the number of VCPUs, now QEMU will abort when sockets*cores*threads don't match the number of VCPUs.
Future incompatible changes
- Three options are using different names on the command line and in configuration file. In particular:
- The "acpi" configuration file section matches command-line option "acpitable";
- The "boot-opts" configuration file section matches command-line option "boot";
- The "smp-opts" configuration file section matches command-line option "smp".
- -readconfig will standardize on the name for the command line option.
- Behavior of automatic calculation of SMP topology when some SMP topology options for -smp are omitted (sockets, cores, threads) will change in the future. If guest ABI needs to be preserved on upgrades while using the SMP topology options, users should either set set all options explicitly (sockets, cores, threads), or omit all of them.
- Image encryption is fatally flawed, and will be dropped entirely. It'll remain available only in qemu-img, so you can use 'qemu-img convert' to convert encrypted images to uncrypted ones.
- Host floppy device pass-through (block driver "host_floppy") is deprecated, and will be dropped in a future release.
- Block device parameter aio=native has no effect without cache.direct=on. It will be made an error.
- A few devices will be configured with explicit properties instead of implicitly. Unlikely to affect users; for the full list, see the 2.3 ChangeLog.
- QMP command blockdev-add is still a work in progress. It doesn't support all block drivers, it lacks a matching blockdev-del, and more. It might change incompatibly.
ARM
KVM
MIPS
PowerPC
IBM (pSeries)
Freescale (BookE)
PReP
s390
SPARC
TriCore
x86
KVM
Xen
Device emulation and assignment
ACPI
Audio
IDE
SCSI
PCI/PCIe
USB
VFIO
VGA
Character devices
GUI
Monitor
Migration
Network
Block devices in system emulation
Block devices and tools
TCG
Tracing
Guest agent
User-mode emulation
Build dependencies
- QEMU now requires a minimum glib version of 2.22. (In particular, we will no longer build on a stock RHEL5 or Centos 5 system.)