ChangeLog/2.1: Difference between revisions

Revision as of 14:04, 18 June 2014

(as of commit e00fcfeab3d452cba3d0a08991a39ab15df66424)

System emulation

Incompatible changes

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.

Future incompatible changes

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

Improvements to Allwinner SoC emulation.
Initial support in TCG for EL2 and EL3.
Much more complete support for AArch64.

LM32

Support for semihosting.

Microblaze

Support for u-boot initrd images.

Power

Support for VFIO (with guest-side IOMMU) on pSeries.
Support for emulation of decimal number instructions.

s390

SPARC

Improved IOMMU emulation.

x86

QEMU now presents version 0x14 for the emulated local APIC, for consistency with KVM and improved compatibility with Mac OS X.
More faithful SMBus controller emulation.
More faithful CPL (current privilege level) emulation in TCG mode.
More faithful MMU emulation in TCG mode, including support for 1GB pages and SMEP/SMAP bugfixes.

KVM

Xen

Xtensa

Device emulation and assignment

SCSI

Support for MSI and MSI-X in the megasas emulation.

USB

Support for file-sharing via MTP emulation
Host USB3 device can be attached to a EHCI (USB 2.0) controller in the guest

VFIO

Support for RTL8168 NICs.

GUI

Many bug fixes for the GTK+ interface.
Mouse wheel support for the SDL 2.0 interface.

Monitor

More commands support command-line completion.

Migration

Many fixes to XBZRLE.

Network

More variants of the e1000 NIC are supported (e1000-82540em, e1000-82544gc, e1000-82545em). The default e1000 fails with versions of Mac OS X starting at 10.9, while the new e1000-82545em works with all versions of Mac OS X starting at 10.6.

Block devices in system emulation

Filenames can be JSON objects preceded by "json:", for example json:{'driver':'raw','file.filename':'test.img'}. This new syntax can be used in the file property for -drive, but also in qemu-io, qemu-img or backing file names.
The threaded backend for virtio-blk, introduced in QEMU 1.4, now supports almost all features of the block layer including: image formats, POSIX AIO (aio=threads), I/O throttling. It also does not require anymore manually setting config-wce=off. It is still considered experimental and is still missing support for long-running jobs (streaming, mirroring, snapshot deletion, backup, etc.).

Various

Block devices and tools

Support for compressed (streamOptimized) VMDK images as conversion targets.

TCG

Improvement to AArch64, Alpha, ia64, MIPS, S390 and SPARC backends.

Tracing

Support for enabling multiple trace backends using for example "--enable-trace-backends=simple,ftrace" on the configure command line.

User-mode emulation

Improved support for FreeBSD.
Support for opening /proc/self/exe.
New target ppc64le-linux-user, for little-endian Power platforms.

@@ Line 3: / Line 3: @@
 == System emulation ==
 === Incompatible changes ===
+* 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.
 === Future incompatible changes ===
@@ Line 24: / Line 26: @@
 === Power ===
 * Support for VFIO (with guest-side IOMMU) on pSeries.
+* Support for emulation of decimal number instructions.
 === s390 ===
 === SPARC ===
+* Improved IOMMU emulation.
 === x86 ===
@@ Line 33: / Line 37: @@
 * More faithful SMBus controller emulation.
 * More faithful CPL (current privilege level) emulation in TCG mode.
+* More faithful MMU emulation in TCG mode, including support for 1GB pages and SMEP/SMAP bugfixes.
 ==== KVM ====
@@ Line 62: / Line 67: @@
 === Network ===
+* More variants of the e1000 NIC are supported (e1000-82540em, e1000-82544gc, e1000-82545em).  The default e1000 fails with versions of Mac OS X starting at 10.9, while the new e1000-82545em works with all versions of Mac OS X starting at 10.6.
 === Block devices in system emulation ===
 * Filenames can be JSON objects preceded by "json:", for example ''json:{'driver':'raw','file.filename':'test.img'}''. This new syntax can be used in the file property for -drive, but also in qemu-io, qemu-img or backing file names.
+* The threaded backend for virtio-blk, introduced in QEMU 1.4, now supports almost all features of the block layer including: image formats, POSIX AIO (aio=threads), I/O throttling<!-- statistics, error recovery -->. It also does not require anymore manually setting config-wce=off. It is still considered experimental and is still missing support for long-running jobs (streaming, mirroring, snapshot deletion, backup, etc.).
 === Various ===
@@ Line 75: / Line 82: @@
 == Tracing ==
+* Support for enabling multiple trace backends using for example "--enable-trace-backends=simple,ftrace" on the configure command line.
 == User-mode emulation ==
+* Improved support for FreeBSD.
 * Support for opening /proc/self/exe.
+* New target ppc64le-linux-user, for little-endian Power platforms.
 == Known issues ==