# systemd-detect-virt

## NAME



           systemd-detect-virt - Detect execution in a virtualized
           environment
    


## SYNOPSIS



    
           **systemd-detect-virt**[OPTIONS...]
    


## DESCRIPTION



           **systemd-detect-virt** detects execution in a virtualized
           environment. It identifies the virtualization technology and can
           distinguish full machine virtualization from container
           virtualization.  systemd-detect-virt exits with a return value of
           0 (success) if a virtualization technology is detected, and
           non-zero (error) otherwise. By default, any type of virtualization
           is detected, and the options **--container** and **--vm** can be used to
           limit what types of virtualization are detected.
    
           When executed without **--quiet** will print a short identifier for
           the detected virtualization technology. The following technologies
           are currently identified:
    
           **Table 1. Known virtualization technologies (both VM, i.e. full**
           **hardware virtualization, and container, i.e. shared kernel**
           **virtualization)**
           ┌───────────┬────────────────┬────────────────────┐
           │ **Type** │ **ID** │ **Product** │
           ├───────────┼────────────────┼────────────────────┤
           │ VM        │ _qemu_           │ QEMU software      │
           │           │                │ virtualization,    │
           │           │                │ without KVM        │
           │           ├────────────────┼────────────────────┤
           │           │ _kvm_            │ Linux KVM kernel   │
           │           │                │ virtual machine,   │
           │           │                │ in combination     │
           │           │                │ with QEMU. Not     │
           │           │                │ used for other     │
           │           │                │ virtualizers using │
           │           │                │ the KVM            │
           │           │                │ interfaces, such   │
           │           │                │ as Oracle          │
           │           │                │ VirtualBox or      │
           │           │                │ Amazon EC2 Nitro,  │
           │           │                │ see below.         │
           │           ├────────────────┼────────────────────┤
           │           │ _amazon_         │ Amazon EC2 Nitro   │
           │           │                │ using Linux KVM    │
           │           ├────────────────┼────────────────────┤
           │           │ _zvm_            │ s390 z/VM          │
           │           ├────────────────┼────────────────────┤
           │           │ _vmware_         │ VMware Workstation │
           │           │                │ or Server, and     │
           │           │                │ related products   │
           │           ├────────────────┼────────────────────┤
           │           │ _microsoft_      │ Hyper-V, also      │
           │           │                │ known as Viridian  │
           │           │                │ or Windows Server  │
           │           │                │ Virtualization     │
           │           ├────────────────┼────────────────────┤
           │           │ _oracle_         │ Oracle VM          │
           │           │                │ VirtualBox         │
           │           │                │ (historically      │
           │           │                │ marketed by        │
           │           │                │ innotek and Sun    │
           │           │                │ Microsystems), for │
           │           │                │ legacy and KVM     │
           │           │                │ hypervisor         │
           │           ├────────────────┼────────────────────┤
           │           │ _powervm_        │ IBM PowerVM        │
           │           │                │ hypervisor — comes │
           │           │                │ as firmware with   │
           │           │                │ some IBM POWER     │
           │           │                │ servers            │
           │           ├────────────────┼────────────────────┤
           │           │ _xen_            │ Xen hypervisor     │
           │           │                │ (only domU, not    │
           │           │                │ dom0)              │
           │           ├────────────────┼────────────────────┤
           │           │ _bochs_          │ Bochs Emulator     │
           │           ├────────────────┼────────────────────┤
           │           │ _uml_            │ User-mode Linux    │
           │           ├────────────────┼────────────────────┤
           │           │ _parallels_      │ Parallels Desktop, │
           │           │                │ Parallels Server   │
           │           ├────────────────┼────────────────────┤
           │           │ _bhyve_          │ bhyve, FreeBSD     │
           │           │                │ hypervisor         │
           │           ├────────────────┼────────────────────┤
           │           │ _qnx_            │ QNX hypervisor     │
           │           ├────────────────┼────────────────────┤
           │           │ _acrn_           │ **ACRN hypervisor******[1] │
           │           ├────────────────┼────────────────────┤
           │           │ _apple_          │ **Apple** │
           │           │                │ **virtualization** │
           │           │                │ **framework******[2]       │
           │           ├────────────────┼────────────────────┤
           │           │ _sre_            │ **LMHS SRE** │
           │           │                │ **hypervisor******[3]      │
           │           ├────────────────┼────────────────────┤
           │           │ _google_         │ **Google Compute** │
           │           │                │ **Engine******[4]          │
           ├───────────┼────────────────┼────────────────────┤
           │ Container │ _openvz_         │ OpenVZ/Virtuozzo   │
           │           ├────────────────┼────────────────────┤
           │           │ _lxc_            │ Linux container    │
           │           │                │ implementation by  │
           │           │                │ LXC                │
           │           ├────────────────┼────────────────────┤
           │           │ _lxc-libvirt_    │ Linux container    │
           │           │                │ implementation by  │
           │           │                │ libvirt            │
           │           ├────────────────┼────────────────────┤
           │           │ _systemd-nspawn_ │ systemd's minimal  │
           │           │                │ container          │
           │           │                │ implementation,    │
           │           │                │ see                │
           │           │                │ systemd-nspawn(1)  │
           │           ├────────────────┼────────────────────┤
           │           │ _docker_         │ Docker container   │
           │           │                │ manager            │
           │           ├────────────────┼────────────────────┤
           │           │ _podman_         │ **Podman******[5]          │
           │           │                │ container manager  │
           │           ├────────────────┼────────────────────┤
           │           │ _rkt_            │ rkt app container  │
           │           │                │ runtime            │
           │           ├────────────────┼────────────────────┤
           │           │ _wsl_            │ **Windows Subsystem** │
           │           │                │ **for Linux******[6]       │
           │           ├────────────────┼────────────────────┤
           │           │ _proot_          │ **proot******[7] userspace │
           │           │                │ chroot/bind mount  │
           │           │                │ emulation          │
           │           ├────────────────┼────────────────────┤
           │           │ _pouch_          │ **Pouch******[8] Container │
           │           │                │ Engine             │
           └───────────┴────────────────┴────────────────────┘
    
           If multiple virtualization solutions are used, only the
           "innermost" is detected and identified. That means if both machine
           and container virtualization are used in conjunction, only the
           latter will be identified (unless**--vm** is passed).
    
           Windows Subsystem for Linux is not a Linux container, but an
           environment for running Linux userspace applications on top of the
           Windows kernel using a Linux-compatible interface. WSL is
           categorized as a container for practical purposes. Multiple WSL
           environments share the same kernel and services should generally
           behave like when being run in a container.
    
           When executed with **--cvm** , instead of printing the virtualization
           technology, it will display the confidential virtual machine
           technology, if any. The following technologies are currently
           identified:
    
           **Table 2. Known confidential virtualization technologies**
           ┌────────┬──────────┬────────────────────┐
           │ **Arch** │ **ID** │ **Technology** │
           ├────────┼──────────┼────────────────────┤
           │ x86_64 │ _sev_      │ AMD Secure         │
           │        │          │ Encrypted          │
           │        │          │ Virtualization     │
           │        ├──────────┼────────────────────┤
           │        │ _sev-es_   │ AMD Secure         │
           │        │          │ Encrypted          │
           │        │          │ Virtualization -   │
           │        │          │ Encrypted State    │
           │        ├──────────┼────────────────────┤
           │        │ _sev-snp_  │ AMD Secure         │
           │        │          │ Encrypted          │
           │        │          │ Virtualization -   │
           │        │          │ Secure Nested      │
           │        │          │ Paging             │
           │        ├──────────┼────────────────────┤
           │        │ _tdx_      │ Intel Trust Domain │
           │        │          │ Extensions         │
           ├────────┼──────────┼────────────────────┤
           │ s390x  │ _protvirt_ │ IBM Protected      │
           │        │          │ Virtualization     │
           │        │          │ (Secure Execution) │
           ├────────┼──────────┼────────────────────┤
           │ arm64  │ _cca_      │ Arm Confidential   │
           │        │          │ Compute            │
           │        │          │ Architecture       │
           └────────┴──────────┴────────────────────┘
    


## OPTIONS



           The following options are understood:
    
           **-c** , **--container**
               Only detects container virtualization (i.e. shared kernel
               virtualization).
    
           **-v** , **--vm**
               Only detects hardware virtualization.
    
           **-r** , **--chroot**
               Detect whether invoked in a chroot(2) environment. In this
               mode, no output is written, but the return value indicates
               whether the process was invoked in a **chroot()** environment or
               not.
    
               Added in version 228.
    
           **--private-users**
               Detect whether invoked in a user namespace. In this mode, no
               output is written, but the return value indicates whether the
               process was invoked inside of a user namespace or not. See
               user_namespaces(7) for more information.
    
               Added in version 232.
    
           **--cvm**
               Detect whether invoked in a confidential virtual machine. The
               result of this detection may be used to disable features that
               should not be used in confidential VMs. It must not be used to
               release security sensitive information. The latter must only
               be released after attestation of the confidential environment.
    
               Added in version 254.
    
           **-q** , **--quiet**
               Suppress output of the virtualization technology identifier.
    
           **--list**
               Output all currently known and detectable container and VM
               environments.
    
               Added in version 239.
    
           **--list-cvm**
               Output all currently known and detectable confidential
               virtualization technologies.
    
               Added in version 254.
    
           **-h** , **--help**
               Print a short help text and exit.
    
           **--version**
               Print a short version string and exit.
    


## EXIT STATUS



           If a virtualization technology is detected, 0 is returned, a
           non-zero code otherwise.
    


## NOTES



            1. ACRN hypervisor
               https://projectacrn.org
    
            2. Apple virtualization framework
               https://developer.apple.com/documentation/virtualization
    
            3. LMHS SRE hypervisor
               https://www.lockheedmartin.com/en-us/products/Hardened-Security-for-Intel-Processors.html
    
            4. Google Compute Engine
               https://cloud.google.com/compute
    
            5. Podman
               https://podman.io
    
            6. Windows Subsystem for Linux
               https://docs.microsoft.com/en-us/windows/wsl/about
    
            7. proot
               https://proot-me.github.io/
    
            8. Pouch
               https://github.com/alibaba/pouch
    


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