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libstore: Add apple-virt to system features when available

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I'm sure that we'll adjust the implementation over time, but this
at least discerns between an apple silicon bare metal machine and
a tart VM.
This commit is contained in:
Robert Hensing 2023-10-19 16:59:35 +02:00
parent 9bc7b4f463
commit 9277eb276b
3 changed files with 37 additions and 0 deletions
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31
src/libstore/globals.cc
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@ -24,6 +24,9 @@
#include "config-impl.hh"
#ifdef __APPLE__
#include <sys/sysctl.h>
#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;
}