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What are equivalences to QEMU/KVM in VirtualBox?


What's the difference between KVM, QEMU and libvirt?What is the relation between Virtual Machine Manager and KVM/QEMU?Using mplayer inside kvm/qemuHow to make new KVM with existing hard driveWhy is qemu-kvm needed in Debian Wheezy when running qemu with “-enable-kvm” option?Unable to boot a kvm guest via qemu/kvm-toolsQEMU/KVM: USB3 passthrough to FreeBSDHow to use Vagrant with VirtualBox AND kvm-qemu installed?How to switch between KVM and VirtualBox on Ubuntu 18.04How to set video memory with KVM/QEMU virtualization?What is the relation between Virtual Machine Manager and KVM/QEMU?Can I run a .vdi file for Windows 8.1. virtual machine in KVM/QEMU or VMM?













2















Are QEMU and KVM both kernel modules?



In VirtualBox, what are the equivalences to these kernel modules?



Thanks.






virtualbox kvm qemu







share|improve this question






















  • Do the unaccelrated solutions by qemu and virtualbox not use any kernel module?

    – Tim
    yesterday















2















Are QEMU and KVM both kernel modules?



In VirtualBox, what are the equivalences to these kernel modules?



Thanks.






virtualbox kvm qemu







share|improve this question






















  • Do the unaccelrated solutions by qemu and virtualbox not use any kernel module?

    – Tim
    yesterday













2












2








2








Are QEMU and KVM both kernel modules?



In VirtualBox, what are the equivalences to these kernel modules?



Thanks.






virtualbox kvm qemu







share|improve this question














Are QEMU and KVM both kernel modules?



In VirtualBox, what are the equivalences to these kernel modules?



Thanks.






virtualbox kvm qemu




virtualbox kvm qemu






share|improve this question













share|improve this question











share|improve this question




share|improve this question










asked yesterday









TimTim

28.1k78269490




28.1k78269490












  • Do the unaccelrated solutions by qemu and virtualbox not use any kernel module?

    – Tim
    yesterday

















  • Do the unaccelrated solutions by qemu and virtualbox not use any kernel module?

    – Tim
    yesterday
















Do the unaccelrated solutions by qemu and virtualbox not use any kernel module?

– Tim
yesterday





Do the unaccelrated solutions by qemu and virtualbox not use any kernel module?

– Tim
yesterday










1 Answer
1






active

oldest

votes


















4














KVM is implemented as a number of kernel modules, kvm and an architecture-specific module (kvm-amd for AMD, kvm-intel for Intel). QEMU is a user-space application which can use KVM if it’s available but doesn’t need it.



VirtualBox also has several kernel modules, the main one of which is vboxdrv. This handles ring 0 duties for VirtualBox.



The two sets of kernel modules are similar but not identical, i.e. their features don’t overlap exactly. The virtualisation details in both setups are quite different.



(If you look through VirtualBox you’ll find references to KVM, but it doesn’t use KVM. It contains some source code referencing KVM, because it includes QEMU’s recompiler, but the KVM support is explicitly disabled. It also provides a KVM-compatible paravirtualisation interface for guests. You must take care never to use different virtual machine hosts with hardware acceleration in parallel, because they are liable to walk over each other and potentially crash the host — so you can run multiple VMs with QEMU and KVM, but don’t try running VMs with QEMU/KVM and VirtualBox simultaneously.)






share|improve this answer

























  • Thanks. How do I know if I run a KVM (or Virtualbox) VM with hardware acceraltion or not?

    – Tim
    yesterday











  • Is QEMU really a user space process instead of a kernel module? unix.stackexchange.com/a/506417/674 says "Qemu is the lowest level that emulates processor and peripherals" and "KVM is to accelerate it if CPU has VT enabled", so I thought both QEMU and KVM are kernel modules.

    – Tim
    yesterday












  • Is it correct that libvirt is a server process, and VMM a client process? Is QEMU also a server to VMM? What is the relation and difference between QEMU and libvirt processes? Do all the four components communicate by KVM <->QEMU <-> libvirt <-> VMM?

    – Tim
    yesterday












  • What’s the point in repeating your comment on different questions? This question has nothing to do with VMM and libvirt.

    – Stephen Kitt
    yesterday











  • If you use KVM, you’ve got hardware acceleration (so with QEMU, qemu-kvm or the KVM “enable” option). I don’t know the equivalent in VirtualBox off-hand.

    – Stephen Kitt
    yesterday










Your Answer








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1 Answer
1






active

oldest

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1 Answer
1






active

oldest

votes









active

oldest

votes






active

oldest

votes









4














KVM is implemented as a number of kernel modules, kvm and an architecture-specific module (kvm-amd for AMD, kvm-intel for Intel). QEMU is a user-space application which can use KVM if it’s available but doesn’t need it.



VirtualBox also has several kernel modules, the main one of which is vboxdrv. This handles ring 0 duties for VirtualBox.



The two sets of kernel modules are similar but not identical, i.e. their features don’t overlap exactly. The virtualisation details in both setups are quite different.



(If you look through VirtualBox you’ll find references to KVM, but it doesn’t use KVM. It contains some source code referencing KVM, because it includes QEMU’s recompiler, but the KVM support is explicitly disabled. It also provides a KVM-compatible paravirtualisation interface for guests. You must take care never to use different virtual machine hosts with hardware acceleration in parallel, because they are liable to walk over each other and potentially crash the host — so you can run multiple VMs with QEMU and KVM, but don’t try running VMs with QEMU/KVM and VirtualBox simultaneously.)






share|improve this answer

























  • Thanks. How do I know if I run a KVM (or Virtualbox) VM with hardware acceraltion or not?

    – Tim
    yesterday











  • Is QEMU really a user space process instead of a kernel module? unix.stackexchange.com/a/506417/674 says "Qemu is the lowest level that emulates processor and peripherals" and "KVM is to accelerate it if CPU has VT enabled", so I thought both QEMU and KVM are kernel modules.

    – Tim
    yesterday












  • Is it correct that libvirt is a server process, and VMM a client process? Is QEMU also a server to VMM? What is the relation and difference between QEMU and libvirt processes? Do all the four components communicate by KVM <->QEMU <-> libvirt <-> VMM?

    – Tim
    yesterday












  • What’s the point in repeating your comment on different questions? This question has nothing to do with VMM and libvirt.

    – Stephen Kitt
    yesterday











  • If you use KVM, you’ve got hardware acceleration (so with QEMU, qemu-kvm or the KVM “enable” option). I don’t know the equivalent in VirtualBox off-hand.

    – Stephen Kitt
    yesterday















4














KVM is implemented as a number of kernel modules, kvm and an architecture-specific module (kvm-amd for AMD, kvm-intel for Intel). QEMU is a user-space application which can use KVM if it’s available but doesn’t need it.



VirtualBox also has several kernel modules, the main one of which is vboxdrv. This handles ring 0 duties for VirtualBox.



The two sets of kernel modules are similar but not identical, i.e. their features don’t overlap exactly. The virtualisation details in both setups are quite different.



(If you look through VirtualBox you’ll find references to KVM, but it doesn’t use KVM. It contains some source code referencing KVM, because it includes QEMU’s recompiler, but the KVM support is explicitly disabled. It also provides a KVM-compatible paravirtualisation interface for guests. You must take care never to use different virtual machine hosts with hardware acceleration in parallel, because they are liable to walk over each other and potentially crash the host — so you can run multiple VMs with QEMU and KVM, but don’t try running VMs with QEMU/KVM and VirtualBox simultaneously.)






share|improve this answer

























  • Thanks. How do I know if I run a KVM (or Virtualbox) VM with hardware acceraltion or not?

    – Tim
    yesterday











  • Is QEMU really a user space process instead of a kernel module? unix.stackexchange.com/a/506417/674 says "Qemu is the lowest level that emulates processor and peripherals" and "KVM is to accelerate it if CPU has VT enabled", so I thought both QEMU and KVM are kernel modules.

    – Tim
    yesterday












  • Is it correct that libvirt is a server process, and VMM a client process? Is QEMU also a server to VMM? What is the relation and difference between QEMU and libvirt processes? Do all the four components communicate by KVM <->QEMU <-> libvirt <-> VMM?

    – Tim
    yesterday












  • What’s the point in repeating your comment on different questions? This question has nothing to do with VMM and libvirt.

    – Stephen Kitt
    yesterday











  • If you use KVM, you’ve got hardware acceleration (so with QEMU, qemu-kvm or the KVM “enable” option). I don’t know the equivalent in VirtualBox off-hand.

    – Stephen Kitt
    yesterday













4












4








4







KVM is implemented as a number of kernel modules, kvm and an architecture-specific module (kvm-amd for AMD, kvm-intel for Intel). QEMU is a user-space application which can use KVM if it’s available but doesn’t need it.



VirtualBox also has several kernel modules, the main one of which is vboxdrv. This handles ring 0 duties for VirtualBox.



The two sets of kernel modules are similar but not identical, i.e. their features don’t overlap exactly. The virtualisation details in both setups are quite different.



(If you look through VirtualBox you’ll find references to KVM, but it doesn’t use KVM. It contains some source code referencing KVM, because it includes QEMU’s recompiler, but the KVM support is explicitly disabled. It also provides a KVM-compatible paravirtualisation interface for guests. You must take care never to use different virtual machine hosts with hardware acceleration in parallel, because they are liable to walk over each other and potentially crash the host — so you can run multiple VMs with QEMU and KVM, but don’t try running VMs with QEMU/KVM and VirtualBox simultaneously.)






share|improve this answer















KVM is implemented as a number of kernel modules, kvm and an architecture-specific module (kvm-amd for AMD, kvm-intel for Intel). QEMU is a user-space application which can use KVM if it’s available but doesn’t need it.



VirtualBox also has several kernel modules, the main one of which is vboxdrv. This handles ring 0 duties for VirtualBox.



The two sets of kernel modules are similar but not identical, i.e. their features don’t overlap exactly. The virtualisation details in both setups are quite different.



(If you look through VirtualBox you’ll find references to KVM, but it doesn’t use KVM. It contains some source code referencing KVM, because it includes QEMU’s recompiler, but the KVM support is explicitly disabled. It also provides a KVM-compatible paravirtualisation interface for guests. You must take care never to use different virtual machine hosts with hardware acceleration in parallel, because they are liable to walk over each other and potentially crash the host — so you can run multiple VMs with QEMU and KVM, but don’t try running VMs with QEMU/KVM and VirtualBox simultaneously.)







share|improve this answer














share|improve this answer



share|improve this answer








edited yesterday

























answered yesterday









Stephen KittStephen Kitt

178k24403481




178k24403481












  • Thanks. How do I know if I run a KVM (or Virtualbox) VM with hardware acceraltion or not?

    – Tim
    yesterday











  • Is QEMU really a user space process instead of a kernel module? unix.stackexchange.com/a/506417/674 says "Qemu is the lowest level that emulates processor and peripherals" and "KVM is to accelerate it if CPU has VT enabled", so I thought both QEMU and KVM are kernel modules.

    – Tim
    yesterday












  • Is it correct that libvirt is a server process, and VMM a client process? Is QEMU also a server to VMM? What is the relation and difference between QEMU and libvirt processes? Do all the four components communicate by KVM <->QEMU <-> libvirt <-> VMM?

    – Tim
    yesterday












  • What’s the point in repeating your comment on different questions? This question has nothing to do with VMM and libvirt.

    – Stephen Kitt
    yesterday











  • If you use KVM, you’ve got hardware acceleration (so with QEMU, qemu-kvm or the KVM “enable” option). I don’t know the equivalent in VirtualBox off-hand.

    – Stephen Kitt
    yesterday

















  • Thanks. How do I know if I run a KVM (or Virtualbox) VM with hardware acceraltion or not?

    – Tim
    yesterday











  • Is QEMU really a user space process instead of a kernel module? unix.stackexchange.com/a/506417/674 says "Qemu is the lowest level that emulates processor and peripherals" and "KVM is to accelerate it if CPU has VT enabled", so I thought both QEMU and KVM are kernel modules.

    – Tim
    yesterday












  • Is it correct that libvirt is a server process, and VMM a client process? Is QEMU also a server to VMM? What is the relation and difference between QEMU and libvirt processes? Do all the four components communicate by KVM <->QEMU <-> libvirt <-> VMM?

    – Tim
    yesterday












  • What’s the point in repeating your comment on different questions? This question has nothing to do with VMM and libvirt.

    – Stephen Kitt
    yesterday











  • If you use KVM, you’ve got hardware acceleration (so with QEMU, qemu-kvm or the KVM “enable” option). I don’t know the equivalent in VirtualBox off-hand.

    – Stephen Kitt
    yesterday
















Thanks. How do I know if I run a KVM (or Virtualbox) VM with hardware acceraltion or not?

– Tim
yesterday





Thanks. How do I know if I run a KVM (or Virtualbox) VM with hardware acceraltion or not?

– Tim
yesterday













Is QEMU really a user space process instead of a kernel module? unix.stackexchange.com/a/506417/674 says "Qemu is the lowest level that emulates processor and peripherals" and "KVM is to accelerate it if CPU has VT enabled", so I thought both QEMU and KVM are kernel modules.

– Tim
yesterday






Is QEMU really a user space process instead of a kernel module? unix.stackexchange.com/a/506417/674 says "Qemu is the lowest level that emulates processor and peripherals" and "KVM is to accelerate it if CPU has VT enabled", so I thought both QEMU and KVM are kernel modules.

– Tim
yesterday














Is it correct that libvirt is a server process, and VMM a client process? Is QEMU also a server to VMM? What is the relation and difference between QEMU and libvirt processes? Do all the four components communicate by KVM <->QEMU <-> libvirt <-> VMM?

– Tim
yesterday






Is it correct that libvirt is a server process, and VMM a client process? Is QEMU also a server to VMM? What is the relation and difference between QEMU and libvirt processes? Do all the four components communicate by KVM <->QEMU <-> libvirt <-> VMM?

– Tim
yesterday














What’s the point in repeating your comment on different questions? This question has nothing to do with VMM and libvirt.

– Stephen Kitt
yesterday





What’s the point in repeating your comment on different questions? This question has nothing to do with VMM and libvirt.

– Stephen Kitt
yesterday













If you use KVM, you’ve got hardware acceleration (so with QEMU, qemu-kvm or the KVM “enable” option). I don’t know the equivalent in VirtualBox off-hand.

– Stephen Kitt
yesterday





If you use KVM, you’ve got hardware acceleration (so with QEMU, qemu-kvm or the KVM “enable” option). I don’t know the equivalent in VirtualBox off-hand.

– Stephen Kitt
yesterday

















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