How to install OS X Mavericks in VirtualBox?
If your host system is OS X, you can follow the instructions on: http://ntk.me/2012/09/07/os-x-on-os-x/

Requirement:
- Install OS X.app purchased in Mac App Store
- iesd

VirtualBox Settings:
- Operating System Version: Mac OS X (64 bit)
- Base Memory: 2048 MB (larger is better)
- Enable EFI  

In the lastest VirtualBox, all the default settings work well. Some people encountered black screen upon booting the virtual machine. They reported that changing the default chipset ICH9 to PIIX3 fixes this issue.


Prepare Install Disk  

gem install iesd


iESD requires ruby-1.9.2 or later.
Yosemite &amp; Mavericks:
The the new InstallESD.dmg is not bootable. Therefore, we need to create a bootable install disk with BaseSystem.dmg.  

iesd -i /Applications/Install\ OS\ X\ Mavericks.app -o Mavericks.dmg -t BaseSystem

All Macs using Intel Haswell CPU (Macs after 2013) need to fake their CPU as Ivy Bridge in order to boot the virtual machine. Thank @danmccombs for this tip.  

VBoxManage modifyvm &lt;vmname&gt; --cpuidset 00000001 000306a9 00020800 80000201 178bfbff


On Mac Pro Early 2009 and other Macs that have ECC memory, AppleTyMCEDriver.kext will cause a kernel panic during the boot. Thus we need to remove it.  

iesd -i /Applications/Install\ OS\ X\ Mavericks.app -o Mavericks.dmg -t BaseSystem --uninstall-extension AppleTyMCEDriver.kext

Mountain Lion &amp; Lion:
The lastest VirtualBox does not require modifying InstallESD.dmg any more.
However, if your virtual machine was freezed during the boot process due to AppleIntelCPUPowerManagement.kext, you need to install NullCPUPowerManagement.kext.  

iesd -i /Applications/Install\ OS\ X\ Mountain\ Lion.app -o Mountain\ Lion.dmg --install-extension NullCPUPowerManagement.kext

The install process is same as normal OS X install on Mac