Disable AVX-512 support for macOS Intel host

Handling AVX-512 instructions requires promoting threads
in the operating system, but it is not required by distros.

So make do with the earlier microarchitectures (v2 and v3),
without exposing all the host features of the newest (v4).

Signed-off-by: Anders F Björklund <[email protected]>

Author: afbjorklund

pkg/limayaml/defaults.go

@@ -73,6 +73,10 @@ func defaultCPUType() CPUType {
 		if arch == X8664 && runtime.GOOS == "darwin" {
 			switch cpuType[arch] {
 			case "host", "max":
+				// disable AVX-512, since it requires trapping instruction faults in guest
+				// Enterprise Linux requires either v2 (SSE4) or v3 (AVX2), but not yet v4.
+				cpuType[arch] += ",-avx512vl"
+
 				// Disable pdpe1gb on Intel Mac
 				// https://github.com/lima-vm/lima/issues/1485
 				// https://stackoverflow.com/a/72863744/5167443