l1d-flush-on-sched on|off: Enables flushing of the level 1 data cache on scheduling EMT for guest execution. l1d-flush-on-vm-enter on|off: Enables flushing of the level 1 data cache on VM enter.
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There is a mistake in the VirtualBox manual stating enter which does not work. Please note that these options may have sever impact on performance. This could be enabled by users overly worried about possible spectre attacks by the VM. ibpb-on-vm- on|off: Enables flushing of the indirect branch prediction buffers on every VM enter or exit respectively.
VBoxManage modifyvm "Whonix-Workstation" -spec-ctrl on VBoxManage modifyvm "Whonix-Workstation" -l1d-flush-on-sched on VBoxManage modifyvm "Whonix-Workstation" -l1d-flush-on-vm-entry on VBoxManage modifyvm "Whonix-Workstation" -ibpb-on-vm-exit on VBoxManage modifyvm "Whonix-Workstation" -ibpb-on-vm-entry on VBoxManage modifyvm "Whonix-Gateway" -mds-clear-on-sched on VBoxManage modifyvm "Whonix-Gateway" -mds-clear-on-vm-entry on Select one IE8 on Win7 (x86) IE9 on Win7 (x86) IE10 on Win7 (x86) IE11 on Win7 (x86) IE11 on Win81 (x86) MSEdge on Win10 (圆4) Stable 1809. VBoxManage modifyvm "Whonix-Gateway" -nestedpaging off VBoxManage modifyvm "Whonix-Gateway" -spec-ctrl on VBoxManage modifyvm "Whonix-Gateway" -l1d-flush-on-sched on VBoxManage modifyvm "Whonix-Gateway" -l1d-flush-on-vm-entry on VBoxManage modifyvm "Whonix-Gateway" -ibpb-on-vm-exit on VBoxManage modifyvm "Whonix-Gateway" -ibpb-on-vm-entry on Users must patiently wait for VirtualBox developers to fix this bug. To learn more, see: VirtualBox 5.2.18 vulnerable to spectre/meltdown despite microcode being installed and the associated VirtualBox forum discussion. All Spectre/Meltdown-related VirtualBox settings are tuned for better security as documented below.Installation of the latest VirtualBox version.
A "not vulnerable" result from spectre-meltdown-checker run on the host.
The reason is VirtualBox is still likely vulnerable, even after: Due to the huge performance penalty and unclear security benefits of applying these changes, it may not be worth the effort. These experimental Spectre/Meltdown defenses are related to issues outlined in Firmware Security and Updates.
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