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Docker can run on macOS (albeit in a VM), but its still running on a Mac "that is already running the Apple Software". So its a perfectly valid option for Mac owners, even if its a VM + container + VM deep.

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This requires kvm exposed in the container. Does docker on mac support kvm?

AFAICT, with QEMU, access to KVM is only required if you care about performance %) Otherwise it can emulate everything for you.

This dockerfile explicitly enables kvm in a way that will cause qemu to fail if it's not present.

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