VirtualBox 5.2.8.121009

The following items were fixed and/or added:
VMM: added support for FSGSBASE, PCID, INVPCID CPU features for guests.
VMM: fixed EMM386 issue with detecting suitable page frame base.
Front end: Linux: prevent VM window from jumping and auto-resizing to tiny size after resizing it on HiDPI screen.
Front end: Linux: fixed seamless regression caused by wm_class functionality.
Front end: switched to https downloads.
Front end: fixed crash while opening New machine wizard.
Audio: added support for distinguishing recording sources in the PulseAudio mixer on the host when multiple VMs are running.
Audio: various fixes for the DirectSound backend.
Video recording: added better file seeking support and fixed playback of recorded files with certain players (e.g. Firefox).
Audio: various fixes for Windows guest surround setups.
Audio: various fixes for HDA emulation.
Serial: fixed an issue where the serial port parameters in the emulation and host serial port got out of sync.
Storage: fixed overwriting certain INQUIRY data for the DVD/CD drive attached to a AHCI controller.
Storage: fixed handling VMDK images created by Amazon EC2 VM export.
Network: fixed PXE boot regression in e1000.
Network: Added a workaround for older guests which do not enable bus mastering for the virtio PCI device.
3D: add environment variable to configure presenting 3D content on main thread.
Windows hosts: fixed indiscriminate binding of NDIS5 bridged driver, that caused PPPOE malfunction.
Windows guests: fixed incorrect function error when using shared folders in certain appli-cations.
Linux guests: Linux 4.15 support.
Linux guests: fixed black screen when 3D enabled in guests.
Linux guests: suppress setuid and setgid in shared folders.