Add a blog post about the release of version 4.0.0

Based on the contents of Michael Roth's announce e-mail for 4.0.0.

Signed-off-by: Thomas Huth <[email protected]>

Author: huth

_posts/2019-04-24-qemu-4-0-0.md

@@ -0,0 +1,71 @@
+---
+layout: post
+title:  "QEMU version 4.0.0 released"
+date:   2019-04-24 07:45:00 +0200
+categories: [releases, 'qemu 4']
+---
+We would like to announce the availability of the QEMU 4.0.0 release.
+This release contains 3100+ commits from 220 authors.
+
+You can grab the tarball from our 
+[download page](https://www.qemu.org/download/#source).
+The full list of changes are available
+[in the Wiki](https://wiki.qemu.org/ChangeLog/4.0).
+
+Highlights include:
+
+ * ARM: ARMv8+ extensions for SB, PredInv, HPD, LOR, FHM, AA32HPD,
+   PAuth, JSConv, CondM, FRINT, and BTI
+ * ARM: new emulation support for "Musca" and "MPS2" development boards
+ * ARM: virt: support for >255GB of RAM and u-boot "noload" image types
+ * ARM: improved emulation of ARM PMU
+ * HPPA: support for TLB protection IDs and TLB trace events
+ * MIPS: support for multi-threaded TCG emulation
+ * MIPS: emulation support for I7200 I6500 CPUs, QMP-base querying of
+   CPU types, and improved support for SAARI and SAAR configuration registers
+ * MIPS: improvements to Interthread Communication Unit, Fulong 2E
+   machine types, and end-user documentation.
+ * PowerPC: pseries/powernv: support for POWER9 large decrementer
+ * PowerPC: pseries: emulation support for XIVE interrupt controller
+ * PowerPC: pseries: support for hotplugging PCI host bridges (PHBs)
+ * PowerPC: pseries: Spectre/Meltdown mitigations enabled by default,
+   additional support for count-cache-flush mitigation
+ * RISC-V: virt: support for PCI and USB
+ * RISC-V: support for TSR, TW, and TVM fields of mstatus, FS field now
+   supports three stats (dirty, clean, and off)
+ * RISC-V: built-in gdbserver supports register lists via XML files
+ * s390: support for z14 GA 2 CPU model, Multiple-epoch and PTFF
+   features now enabled in z14 CPU model by default
+ * s390: vfio-ap: now supports hot plug/unplug, and no longer inhibits memory
+   ballooning
+ * s390: emulation support for floating-point extension facility and
+   vector support instructions
+ * x86: HAX accelerator now supported POSIX hosts other than Darwin,
+   including Linux and NetBSD
+ * x86: Q35: advertised PCIe root port speeds will now optimally default
+   to maximum link speed (16GT/s) and width (x32) provided by PCIe 4.0 for
+   QEMU 4.0+ machine types; older machine types will retain 2.5GT/x1
+   defaults for compatibility.
+ * x86: Xen PVH images can now be booted with "-kernel" option
+ * Xtensa: xtfpga: improved SMP support for linux (interrupt
+   distributor, IPI, and runstall) and new SMP-capable test_mmuhifi_c3
+   core configuration
+ * Xtensa: support for Flexible length instructions extension (FLIX)
+ * GUI: new '-display spice-app' to configure/launch a Spice client GUI with
+   a similar UI to QEMU GTK. VNC server now supports access controls via
+   tls-authz/sasl-authz options
+ * QMP: support for "out-of-band" command execution, can be useful for
+   postcopy migration recovery. Additional QMP commands for working with
+   block devices and dirty bitmaps
+ * VFIO: EDID interface for supported mdev (Intel vGPU for kernel 5.0+),
+   allows resolution setting via xres/yres options.
+ * Xen: new 'xen-disk' device which can create a Xen PV disk backend,
+   and performance improvements for Xen PV disk backend.
+ * Network Block Device: improved tracing and error diagnostics, improved
+   client compatibility with buggy NBD server implementations, new
+   --bitmap, --list, --tls-authz options for qemu-nbd
+ * virtio-blk now supports DISCARD and WRITE_ZEROES
+ * pvrdma device now supports RDMA Management Datagram services (MAD)
+ * and lots more...
+
+Thank you to everyone involved!