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JAILHOUSE ========= Jailhouse is a partitioning Hypervisor based on Linux. It is able to run bare-metal applications or (adapted) operating systems besides Linux. For this purpose it configures CPU and device virtualization features of the hardware platform in a way that none of these domains, called "cells" here, can interfere with each other in an unacceptable way. Jailhouse is optimized for simplicity rather than feature richness. Once activated, it runs bare-metal, i.e. it takes full control over the hardware and need no external support. However, in contrast to other bare-metal hypervisors, it is loaded and configured by a normal Linux system. Its management interface is based on Linux infrastructure. So you boot Linux first, then you enable Jailhouse and finally you split off parts of the system's resources and assign them to additional cells. WARNING: This is work in progress! Don't expect things to be complete in any dimension. Use at your own risk. And keep the reset button in reach. Community --------- Project home: https://github.com/siemens/jailhouse git: https://github.com/siemens/jailhouse.git firstname.lastname@example.org:siemens/jailhouse.git Mailing list: email@example.com Subscription: firstname.lastname@example.org https://groups.google.com/forum/#!forum/jailhouse/join Archives: http://news.gmane.org/gmane.linux.jailhouse Requirements (preliminary) -------------------------- currently: - Intel x86 processor with VMX support, more precisely - EPT (extended page tables) - unrestricted guest mode - at least 2 logical CPUs upcoming: - Intel IOMMU with interrupt remapping support Build ----- Simply run make, optionally specifying the target kernel directory: make [KERNELDIR=/path/to/kernel/objects] Note that the command line tool "jailhouse" requires a separate make run from within the tools/ directory. Configuration ------------- Jailhouse requires one configuration file for the complete system and one for each additional cell beside Linux. The configuration is currently being defined manually by filling C structures. To study the structure, use config/qemu-vm.c for a system configuration and config/minimal.c for a cell configuration as reference. The build system will pick up every .c file from the config/ directory and generate a corresponding .cell file. .cell files can then be passed to the jailhouse command line tool for enabling the hypervisor and creating new cells. Demonstration in QEMU/KVM ------------------------- The included system configuration qemu-vm.c can be used to run Jailhouse in QEMU/KVM virtual machine on Intel x86 hosts. Currently it requires kvm.git, next branch on the host (in order to get support for nested unrestricted guest mode). 3.13 is expected to include all necessary feature for this test. You also need a Linux guest image with a recent kernel (tested with >= 3.9) and the ability to build a module for this kernel. Make sure the kvm-intel module was loaded with nested=1 to enable nested VMX support. Start the virtual machine as follows: qemu-system-x86_64 LinuxInstallation.img -m 1G -enable-kvm -serial stdio \ -cpu kvm64,-kvm_pv_eoi,-kvm_steal_time,-kvm_asyncpf,-kvmclock,+vmx,+x2apic \ -smp 4 Inside the VM, make sure that jailhouse.bin, generated by the build process, is available for firmware loading (typically /lib/firmware). Load jailhouse.ko and then enable Jailhouse like this: jailhouse enable /path/to/qemu-vm.cell Next you can create a cell with a demonstration application as follows: jailhouse cell create /path/to/minimal.cell /path/to/apic-demo.bin \ -l 0xf0000 apic-demo.bin is left by the built process in the inmate/ directory. This application will program the APIC timer interrupt to fire at 10 Hz, measuring the jitter against the PM timer and displaying the result on the console. Given that this demonstration runs in a virtual machine, obviously no decent latencies should be expected.