Incompatible changes:
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The 82573L NIC was incorrectly treated as an 8254xx model. It no longer works correctly on either Linux (3.14.*) or Windows 7 and has been removed.
On x86, migration from QEMU 1.7 to QEMU 2.0 was broken if the guest had PCI bridges or for some number of CPUs (12, 13, 14, 54, 55, 56, 97, 98, 99, 139, 140) are the only ones). QEMU 2.1 fixes this, so that migration from QEMU 1.7 to QEMU 2.1 should always work. However, the fix breaks the following scenarios instead:
migration from QEMU 2.0 to QEMU 2.1 with PCI bridges and machine types pc-i440fx-1.7/pc-i440fx-2.0
migration from QEMU 2.0 to QEMU 2.1 with the aforementioned number of CPUs and machine type pc-i440fx-1.7
Future incompatible changes:
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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".
Starting with QEMU xyz.jkl, -readconfig will standardize on the name for the command line option.
ARM
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Firmware can be passed to the vexpress machine via -bios.
Improvements to Allwinner SoC emulation.
AArch64 TCG system emulation support.
AArch64 SHA and Crypto instruction support.
LM32
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Support for semihosting.
Microblaze
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Support for u-boot initrd images.
MIPS
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Support for KVM in the Malta board.
more...
