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0.15.1

(commit 82b2b32) Version 0.15.1
(commit 4a81ab8) qed: fix use-after-free during l2 cache commit
(commit 68e3508) sdl: Fix termination in -no-shutdown mode
(commit fb52404) Fix termination by signal with -no-shutdown
(commit 3363983) Add support for finding libpng via pkg-config.
(commit 672aefe) Check for presence of compiler -pthread flag.
(commit 6a10ccc) Allow overriding the location of Samba's smbd.
(commit 7095e71) Fix linker scripts
(commit 91b31d6) Fix install(1) usage to be compatible with OpenBSD's install(1).
(commit b89f4a7) Fix qjson test of solidus encoding
(commit fbdd7c8) configure: Copy test data to build directory
(commit e19a4e8) monitor: fix build breakage for !CONFIG_VNC
(commit ff5aced) monitor: fix build breakage with --disable-vnc
(commit 2af86a2) Fix forcing multicast msgs to loopback on OpenBSD.
(commit a80f53a) user: Restore debug usage message for '-d ?' in user mode emulation

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 8e91ed308062e742610e4cfdfd4a09bc045ead45).
Minor Sparc32 and Sparc64 fixes.

x86

Xen support merged (http://blog.xen.org/index.php/2011/05/13/xen-support-upstreamed-to-qemu/)

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 d967b2f)
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 46a4e4e)

qemu-img

qemu-img convert and rebase now support the -p option which enables progress display (commit 6b837bc)
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 661a0f7)
The performance of qemu-img convert has been improved (commit f6a00aa)

Block Drivers

qcow2

Improved the performance of creating/deleting internal snapshots (commit 93913df)

qed

Support for growing images with qemu-img resize (commit 77a5a0001bd9eaee9da7dc8f0b69702d56b0cc67)
Periodically flush and clear need check bit to reduce chance of leaving image files dirty on power failure (commit 6f321e93abb27b4e7ceb228b4204aa304e95daad)
Fix consistency check on 32-bit hosts (commit 19dfc44a94f759848a0f7de7378b2f8b9af6b5d0)

VMDK

Support for the monolithicFlat subformat (commit 7fa60fa)

Sheepdog

Can now preallocate images during creation (commit a8e0fdd)

RBD

Use the higher level librbd instead of just librados (commit ad32e9c)

IDE Emulation

Added support for the TRIM command (commit d353fb7)
Instead of the device ide-drive for both hard disks and CD-ROMs we have now separate ide-hd and ide-cd devices (commit 1f56e32)
Fixed confusion between the Busmaster IDE status register and internal error state, which could lead to crashes (commit def9379)

CDROM Emulation

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 a8686a9)

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 b443ae6)

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 a404666457b54142d6cfe8302bcded9be4cda379) and snapshot-blkdev-sync (commit d967b2f14f238c24264fa73d02e9b0dde0b19506)
Fixed some issues with the JSON parser (several commits, first one here)
Added the guest agent (commit e3d4d25206a13ca48936e4357a53591997ce6d57)

Tracing

Make simpletrace.py a Python module for trace analysis scripts (blog), (commit 59da66849215eccf1dce2154c84f217a3c39678b)
Make 'simple' backend thread-safe (commit 0b5538c300a56c3cfb33022840fe0b4968147e7a)
Add tracetool --probe-prefix optional argument to prefix DTrace probe names (commit e323c93edf3abb67c37b8e08b78da4835880f12e)

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 cf973e469bd9d47c0460347764c1315a6180e13c)
Numerous bugfixes

New build dependencies (mandatory and optional)

glib-2.0 (mandatory). Used only for guest agent so far, and on platforms that lack ucontext interface (e.g. BSD).
libcurl 7.15.4 or better (optional, required for CURL block driver support)
spice 0.6.0 or better (optional)
libnss3 (network security services from Mozilla project) (unused?). Detected and linked for --enable-smartcard-nss, but apparently not used