ChangeLog/1.4
System emulation
Device emulation
Device assignment
USB
ARM
MIPS
S390
x86
- testdev?
KVM
Xen
- persistent grants support implemented in xen_disk (up to 450% speed in improvement with 15 guests!!);
- safer and correcter flush operation (BLKIF_OP_FLUSH_DISKCACHE) introduced in xen_disk;
- multiple secondary PV consoles support in xen_console;
- many bug fixes.
QMP
Network devices
SLIRP
Block devices
Live Migration
Move migration from a timer to a thread. Migration was blocking the iothread for too long. Latency of the other threads have improved, and measurements/throughput/latency of migration has also improved.