diff --git a/doc/manual/src/release-notes/rl-next.md b/doc/manual/src/release-notes/rl-next.md index 46ce2abac..d0b516dfb 100644 --- a/doc/manual/src/release-notes/rl-next.md +++ b/doc/manual/src/release-notes/rl-next.md @@ -8,6 +8,8 @@ - Introduce new flake installable syntax `flakeref#.attrPath` where the "." prefix denotes no searching of default attribute prefixes like `packages.` or `legacyPackages.`. +- Nix adds `apple-virt` to the default system features on macOS systems that support virtualization. This is similar to what's done for the `kvm` system feature on Linux hosts. + - Introduce a new built-in function [`builtins.convertHash`](@docroot@/language/builtins.md#builtins-convertHash). - `builtins.fetchTree` is now marked as stable. diff --git a/src/libstore/globals.cc b/src/libstore/globals.cc index 5a4cb1824..9c25d9868 100644 --- a/src/libstore/globals.cc +++ b/src/libstore/globals.cc @@ -24,6 +24,9 @@ #include "config-impl.hh" +#ifdef __APPLE__ +#include +#endif namespace nix { @@ -154,6 +157,29 @@ unsigned int Settings::getDefaultCores() return concurrency; } +#if __APPLE__ +static bool hasVirt() { + + int hasVMM; + int hvSupport; + size_t size; + + size = sizeof(hasVMM); + if (sysctlbyname("kern.hv_vmm_present", &hasVMM, &size, NULL, 0) == 0) { + if (hasVMM) + return false; + } + + // whether the kernel and hardware supports virt + size = sizeof(hvSupport); + if (sysctlbyname("kern.hv_support", &hvSupport, &size, NULL, 0) == 0) { + return hvSupport == 1; + } else { + return false; + } +} +#endif + StringSet Settings::getDefaultSystemFeatures() { /* For backwards compatibility, accept some "features" that are @@ -170,6 +196,11 @@ StringSet Settings::getDefaultSystemFeatures() features.insert("kvm"); #endif + #if __APPLE__ + if (hasVirt()) + features.insert("apple-virt"); + #endif + return features; } diff --git a/src/libstore/globals.hh b/src/libstore/globals.hh index 5ec332417..ff7d3df1e 100644 --- a/src/libstore/globals.hh +++ b/src/libstore/globals.hh @@ -714,6 +714,10 @@ public: System features are user-defined, but Nix sets the following defaults: + - `apple-virt` + + Included on darwin if virtualization is available. + - `kvm` Included by default if `/dev/kvm` is accessible.