http://wiki.qemu.org/Index.html
0.15.0
Targets
New targets added: Lattice Mico32 (LM32) and UniCore32.
ARM
Many bugs in Neon and other ARMv6 and ARMv7 instructions have been fixed
Floating point instructions now generally handle NaNs and floating point
status flags correctly
Dummy implementations of cp15 performance counters and cp14 debug registers
mean we can boot more recent Linux kernels that probe for these features
SA-1110/SA-1100 support has been added
New machine models: ARM Versatile Express (machine "vexpress-a9"), Sharp
Zaurus SL-5500 (machine "collie")
LM32
Basic support for LM32 EVR evaluation board
Full-featured support for the Milkymist SoC including video rendering.
Almost complete opcode testsuite
SPARC
Sparc32: Improvements to OpenBIOS make Solaris 8 boot possible.
Sparc64: fix sdivx and udivx instructions, enabling booting HelenOS up to the
command prompt (commit).
Minor Sparc32 and Sparc64 fixes.
Hosts
ARM
Support QEMU′s host C code being compiled in Thumb mode (as some gccs do by
default)
KVM
Common
Countless fixes ported over from qemu-kvm, core is now shared with that tree,
i.e. has the same quality
Pimped up threading model, now fully synchronized with qemu-kvm tree
Removed dependency on external kernel headers, all supported KVM features are
now built into the binary
x86
Paravirtual kvmclock fixes
Stable guest TSC across migration
Support for SMEP CPU feature
Support for VIA CPU features
Reworked & fixed MCE support
Devices
virtio-serial
Various fixes for hot-unplug of ports
Disallow generic ports at id 0: port number 0 is reserved for console ports
for backward compatibility; ′-device virtserialport,nr=0′ is now not
allowed.
Allow re-use of a chardev after a port using it gets unplugged
Add trace events
RTC
MC146818 (for PCs): Follow host clock resets to the past immediately (instead
of freezing the clock)
Balloon
Fix use-after-free bug that lead to qemu crash when ′balloon 0′ was issued
in the monitor
Multiple balloon devices are now forbidden; it doesn′t make sense to have
more than one device at a time.
Negative balloon values are now rejected. The previous behaviour was to
silently deflate the balloon (negative values were parsed as very high
positive values)
Fix memory leaks on exit or unplug of the virtio-balloon device
Fix migration after unplugging of the virtio-balloon device. Previously, the
destination aborted migration for a missing section.
Block Layer
Added missing -drive options to the man page
Expose live snapshot support in QMP using the snapshot-blkdev-sync command
(commit)
Fixed removable media support to not cache the media size. Before this fix,
the guest OS would see the old CD-ROM size even after changing the medium.
(commit)
qemu-img
qemu-img convert and rebase now support the -p option which enables progress
display (commit)
qemu-img commit, convert and rebase now support the -t option which allows to
specify a cache mode that should be used to open the image (commit)
The performance of qemu-img convert has been improved (commit)
Block Drivers
qcow2
Improved the performance of creating/deleting internal snapshots (commit)
qed
Support for growing images with qemu-img resize(commit)
Periodically flush and clear need check bit to reduce chance of leaving image
files dirty on power failure (commit)
Fix consistency check on 32-bit hosts (commit)
VMDK
Support for the monolithicFlat subformat (commit)
Sheepdog
Can now preallocate images during creation (commit)
RBD
Use the higher level librbd instead of just librados (commit)
IDE Emulation
Added support for the TRIM command (commit)
Instead of the device ide-drive for both hard disks and CD-ROMs we have now
separate ide-hd and ide-cd devices (commit)
Fixed confusion between the Busmaster IDE status register and internal error
state, which could lead to crashes (commit)
CDROM Emulation
li> Many fixes to comply with ATAPI specification
GET_EVENT_STATUS_NOTIFICATION: Implement ′media′ subcommand that helps
report tray open/close, media present/absent states to guests. Newer Linux
guests (kernels 2.6.38+) rely on this command to revalidate discs.
Major code refactoring and cleanup
virtio-blk
The serial number of the drive is now exposed as a qdev property (commit)
SCSI Disk Emulation
Instead of the device scsi-disk for both hard disks and CD-ROMs we have now
separate scsi-hd and scsi-cd devices (commit)
Networking
User space (slirp)
Fixed DHCP support in restrict (host-only) mode
Ping packet forwarding to external hosts via unprivileged ICMP sockets of
Linux 3.0
QMP / Monitor
Support for two new QMP commands: inject-nmi (commit) and
snapshot-blkdev-sync (commit)
Fixed some issues with the JSON parser (several commits, first one here)
Added the guest agent (commit)
Tracing
Make simpletrace.py a Python module for trace analysis scripts (blog),
(commit)
Make ′simple′ backend thread-safe (commit)
Add tracetool --probe-prefix optional argument to prefix DTrace probe names
(commit)
Linux-user
Added support for ppoll, sched_{g,s}etaffinity, epoll, pselect6, prlimit64
syscalls
Add s390x and unicore32 linux-user targets
Fix loading binaries from Linux/sparc64 rootfs (commit)
Numerous bugfixes
New build dependencies (mandatory and optional)
glib-2.0 (mandatory)
libcurl 7.15.4 or better (optional, required for CURL block driver support)
spice 0.6.0 or better (optional)
Other stuff
Xen support merged
(http://blog.xen.org/index.php/2011/05/13/xen-support-upstreamed-to-qemu/)
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