QEMU v0.12.3 is released. QEMU is a generic and open source machine emulator and virtualizer.When used as a machine emulator, QEMU can run OSes and programs made for one machine (e.g. an ARM board) on a different machine (e.g. your own PC). By using dynamic translation, it achieves very good performances.When used as a virtualizer, QEMU achieves near native performances by executing the guest code directly on the host CPU. A host driver called the QEMU accelerator (also known as KQEMU) is needed in this case. The virtualizer mode requires that both the host and guest machine use x86 compatible processors.

QEMU v0.12.3 changelog:
- kvm: Fix eflags corruption in kvm mode (Jan Kiszka)
- qcow2: Fix access after end of array (Kevin Wolf)
- ide save/restore pio/atapi cmd transfer fields and io buffer (Marcelo Tosatti)
- net: Monitor command set_link finds only VLAN clients, fix (Markus Armbruster)
- net: info network shows only VLAN clients, fix (Markus Armbruster)
- net: net_check_clients() checks only VLAN clients, fix (Markus Armbruster)
- net: Fix bogus "Warning: vlan 0 with no nics" with -device (Markus Armbruster)
- net: net_check_clients() runs too early to see -device, fix (Markus Armbruster)
- net: Remove unused net_client_uninit() (Markus Armbruster)
- don't dereference NULL after failed strdup (Jim Meyering)
- virtio-net: fix network stall under load (Tom Lendacky)
- json: fix PRId64 on Win32 (Roy Tam)
- fix inet_parse typo (Marcelo Tosatti)
- iothread: fix vcpu stop with smp tcg (Marcelo Tosatti)
- segfault due to buffer overrun in usb-serial (David S. Ahern)
- qcow2: Fix signedness bugs (Kevin Wolf)
- Do not ignore error, if open file failed (-serial /dev/tty) (Evgeniy Dushistov)
- pc-bios: update to newer version of (stable) seabios (Anthony Liguori)
- target-mips: fix ROTR and DROTR by zero (Aurelien Jarno)
- target-mips: fix CpU exception for coprocessor 0 (Nathan Froyd)
- tcg/mips: fix crash in tcg_out_qemu_ld() (Aurelien Jarno)
- target-mips: don't call cpu_loop_exit() from helper.c (Aurelien Jarno)
- virtio-blk: Fix error cases which ignored rerror/werror (Kevin Wolf)
- virtio-blk: Fix restart after read error (Kevin Wolf)
- virtio_blk: Factor virtio_blk_handle_request out (Kevin Wolf)
- cirrus: Properly re-register cirrus_linear_io_addr on vram unmap (Jan Kiszka)
- qcow2: Don't ignore qcow2_alloc_clusters return value (Kevin Wolf)
- qcow2: Don't ignore update_refcount return value (Kevin Wolf)
- qcow2: Allow updating no refcounts (Kevin Wolf)
- qcow2: Improve error handling in update_refcount (Kevin Wolf)
- qcow2: Fix error handling in grow_refcount_table (Kevin Wolf)
- block: Return original error codes in bdrv_pread/write (Kevin Wolf)
- qcow2: Return 0/-errno in qcow2_alloc_cluster_offset (Kevin Wolf)
- qcow2: Return 0/-errno in get_cluster_table (Kevin Wolf)
- qcow2: Fix error handling in qcow_save_vmstate (Kevin Wolf)
- qcow2: Fix error handling in qcow2_grow_l1_table (Kevin Wolf)
- win32/sdl: Fix toggle full screen (Herve Poussineau)
- win32: pair qemu_memalign() with qemu_vfree() (Herve Poussineau)
- vnc_refresh: calling vnc_update_client might free vs (Stefano Stabellini)
- Musicpal: Fix descriptor walk in eth_send (Jan Kiszka)
- Musicpal: Fix wm8750 I2C address (Jan Kiszka)
- fix savevm command without id or tag (Marcelo Tosatti)
- reduce number of reinjects on ACK (Gleb Natapov)
- QMP: Fix asynchronous events delivery (Luiz Capitulino)
- Documentation: Add missing documentation for qdev related command line options (Stefan Weil)
- pc: add driver version compat properties (Gerd Hoffmann)
- scsi: device version property (Gerd Hoffmann)
- ide: device version property (Gerd Hoffmann)
- QMP: Emit asynchronous events on all QMP monitors (Adam Litke)
- Fix QEMU_WARN_UNUSED_RESULT (Kevin Wolf)

Download:QEMU v0.12.3
Source:Here