ChangeLog/1.6: Difference between revisions

Revision as of 17:01, 22 July 2013

System emulation

Device emulation

Block devices

New device "nvme" provides a PCI device that implements the NVMe standard.
Fix for a possible data loss on crashes with IDE disks (due to mishandling of FLUSH requests)

Device assignment

Legacy PCI assignment supports CPU affinity for MSI interrupts.

USB

The XHCI (USB 3.0) controller supports live migration.

PCI

ACPI hotplug of devices behind a PCI bridge is supported. See See Features/PCIBridgeHotplug

ARM

PPC

Mac OS X guests supported (10.2-10.4 for PPC, 10.4 for PPC64)

s390x

If the kernel supports it, virtio-ccw supports ioeventfd and vhost when running on KVM.

SPARC

Sun4c and Sun4d architectures and related CPUs were not fully implemented and have been removed.
24-bit display mode works

x86

Firmware can be exposed to the guest as a flash device (using -pflash) also when running on KVM.
In addition to the "xenfv" machine type, which is kept for backwards compatibility, Xen can now use the pc machine type (including versioned machine types) using "-M pc -machine accel=xen". Note that using PV-on-HVM drivers requires "-M pc -machine accel=xen -device xen-platform".
QEMU can expose the full set of ACPI tables to the guest: See Features/ACPITableGeneration
Conroe, Penryn and Nehalem CPUs have had their CPUID values fixed
"-M isapc" now works on KVM too.
-pflash can be used with KVM too.

Monitor

info block now returns different output for HMP. HMP is not a programmatic interface, please use QMP if you need a stable programmatic interface.
"-serial mon:stdio" will now trap signals in the same way that "-nographic" has always done. This means that ^C will be passed to the guest.

Block devices

The "whitelist" that lets packagers specify which block device formats are supported by QEMU will now allow specifying formats that QEMU should only allow when opened as read-only. The --block-drv-whitelist configure option is thus split in two new options, --block-drv-rw-whitelist and --block-drv-ro-whitelist.
Support for a new block device background job. Started by drive-backup, it will backup a disk's content to a new file. Unlike drive-mirror, the new file will include the source disk's content at the time the backup job was started. Atomic backup of multiple disks is supported using the "transaction" QMP command.
Several bugfixes for VMDK and curl backends.
Support for thin provisioning ("discard") on qcow2 images. When a device is opened with "-drive ...,discard=on", discard requests from the guest are forwarded to the underlying file system or block device as is the case for "raw" format images.

Live Migration

Initial support for live migration over RDMA using "migrate x-rdma:HOST:PORT".
Support for auto-convergence ("CPU stunning")

User interface

BSDs now support the GTK+ user interface.
The GTK+ interface supports -full-screen and -no-quit
The Cocoa user interface now supports Mac OS X 10.6 better.

User-mode emulation

Support for /proc/self has been extnded to include /proc/$$ (where $$ is the result of the getpid() system call).

Guest agent

On Win32, the state directory will be placed under CSIDL_COMMON_APPDATA, which typically is "C:\Documents and Settings\All Users\Application Data".

Host support

linux-user does not support anymore *at system calls on glibc versions older than 2.5.
New TCG target for aarch64.
Build ARM, Microblaze and PPC targets will now use a bundled libfdt if the library is not available on the host.
Support for TUN/TAP on Mac OS X (http://tuntaposx.sourceforge.net)

@@ Line 5: / Line 5: @@
 ==== Block devices ====
 * New device "nvme" provides a PCI device that implements the NVMe standard.
+* Fix for a possible data loss on crashes with IDE disks (due to mishandling of FLUSH requests)
 ==== Device assignment ====
@@ Line 18: / Line 19: @@
 === PPC ===
+* Mac OS X guests supported (10.2-10.4 for PPC, 10.4 for PPC64)
 === s390x ===
@@ Line 23: / Line 25: @@
 === SPARC ===
+* Sun4c and Sun4d architectures and related CPUs were not fully implemented and have been removed.
+* 24-bit display mode works
 === x86 ===
@@ Line 28: / Line 32: @@
 * In addition to the "xenfv" machine type, which is kept for backwards compatibility, Xen can now use the pc machine type (including versioned machine types) using "-M pc -machine accel=xen".  Note that using PV-on-HVM drivers requires "-M pc -machine accel=xen -device xen-platform".
 * QEMU can expose the full set of ACPI tables to the guest: See [[Features/ACPITableGeneration|Features/ACPITableGeneration]]
+* Conroe, Penryn and Nehalem CPUs have had their CPUID values fixed
+* "-M isapc" now works on KVM too.
+* -pflash can be used with KVM too.
-=== QMP ===
+=== Monitor ===
 * info block now returns different output for HMP.  HMP is not a programmatic interface, please use QMP if you need a stable programmatic interface.
+* "-serial mon:stdio" will now trap signals in the same way that "-nographic" has always done.  This means that ^C will be passed to the guest.
 === Block devices ===
@@ Line 40: / Line 48: @@
 === Live Migration ===
 * Initial support for live migration over RDMA using "migrate x-rdma:''HOST'':''PORT''".
+* Support for auto-convergence ("CPU stunning")
+=== User interface ===
+* BSDs now support the GTK+ user interface.
+* The GTK+ interface supports -full-screen and -no-quit
+* The Cocoa user interface now supports Mac OS X 10.6 better.
 == User-mode emulation ==
+* Support for /proc/self has been extnded to include /proc/$$ (where $$ is the result of the ''getpid()'' system call).
 == Guest agent ==
@@ Line 50: / Line 65: @@
 * New TCG target for aarch64.
 * Build ARM, Microblaze and PPC targets will now use a bundled libfdt if the library is not available on the host.
-* Installer for QEMU on Windows hosts (planned).
+* Support for TUN/TAP on Mac OS X (http://tuntaposx.sourceforge.net)