![]() This is a guide for making Limbo running guest OSes in nearly native speed leveraging KVM.įirst you need to install an Android version with a KVM enabled Kernel, unfortunately there aren't many choices the version we used is Android-x86 5.1. If you are not sure leave is as default.ĭisable ACPI: If the QEMU advanced power management emulation might be problematic with some operating systems or you might want to prevent the virtual machine to go to sleep disable this option. Disable if your Operating System does not boot or there are problems opearating the virtual machine.ĭisable HPET: Use this option to fix some timing issues in the guest virtual machine. Currently KVM on Limbo is only tested with Android x86 5.1 live cd and it performs as expected.ĭisable TSC: QEMU timer implementation for Time Stamp Counter seems to not work correctly with ARM hosts and QEMU is unable to boot some Operating Systems. Unfortunately the same is not true for stock Android ARM devices which don't come with a KVM module. For example you can use KVM when you run DSL Linux on an Android x86 device running Limbo x86 emulator. In order to make use of KVM the guest operating system needs to be the same architecture as your Android device. Your android device needs to have a compiled and working KVM module installed. ![]() KVM: QEMU allows near native speeds using virtualization via the Linux KVM module. If you experience slowness disable this option and use only 1 CPU core. This option is applicable to 64bit hosts but might not always work as expected. Prior to MTTCG older versions of QEMU would just interleave all emulated CPU tasks into a single thread. MTTCG: Multi Thread TCG is a feature of QEMU that allows multiple emulated CPU cores to be able to utilize multiple host CPU cores providing better performance. Limbo provides certain CPU features, these are due to some limitations on the arm host implementation and others for acceleration purposes. Consult with the Operating Systems guide to use the recommended value if you use one of the supported operating systems as virtual machines with too much RAM used might take long to pause! Another thing to remember is that adding more memory doesn't mean it will necessarily speed up the virtual machine. You can specify the amount of RAM your OS requires though note that Android devices will limit how much memory an app can request so make sure you don't go overboard. Older Operating system would normally not have any benefit from multiple CPUS so you can leave the value as the default. Note these are emulated CPU cores not real cores that means that if you don't have MTTCG enabled the processing will be still single threaded and will probably end up with slow performance instead. You can specify the number of CPU cores to be emulated for the virtual machine. If you use one of the supported OSes you can find the correct CPU and board under the Operating Systems page. For PowerPC, SPARC, and ARM emulators you need to specify the combination of CPU and Board your operating system is made for otherwise it won't boot up. Some operating systems are only made for x86 64bit CPUs and should inform you during boot up that they require a 64 bit processor. If you experience problems choose Default or qemu32 if the operating system is made for x86 32 bit architecture or qemu64 if the guest architecture is made for x86 64 bit architecture. You can use from older CPU types to newer ones but you have to keep in mind that not everything is compatible. There can be several options for the CPU type you would like to attach to your virtual machine. In contrast, ARM and PowerPC guest machines have a lot of different types that have to be used with the correct CPU type to emulate the correct combination that your operating system was built for so it is recommended to follow the instructions that came with your OS. For example for x86 emulation the major board chipset emulation options are: pc (i440fx/PIIX3 for most operating system), q35 (with modern ICH9 chipset), or ISA pc (compatible with older operating systems). The machine type describes the board and architectural details and can have multiple values for each of the guest architectures that Limbo supports. If you are not sure what to choose you can visit the Operating System (if its a supported OS) or use the default values. This allows you to specify the emulated hardware that your specific operating system requires. Limbo provides the below main options for selecting the components of your virtual machine for each supported architecture.
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