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fix(quickemu): improve TSC flag detection for macOS on AMD CPUs #1808

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Merged
flexiondotorg merged 2 commits into from
Jan 24, 2026
Merged

fix(quickemu): improve TSC flag detection for macOS on AMD CPUs #1808

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db3d3ca
fix(quickemu): improve TSC flag detection for macOS on AMD CPUs
flexiondotorg Jan 24, 2026
0c3165e
fix(quickemu): remove duplicate +invtsc flag for AMD macOS guests
flexiondotorg Jan 24, 2026
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11 changes: 11 additions & 0 deletions quickemu
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Original file line number Diff line number Diff line change
Expand Up @@ -296,6 +296,12 @@ function check_cpu_flag() {
if lscpu | grep -o "^Flags\b.*: .*\b${HOST_CPU_FLAG}\b" > /dev/null; then
return 0
else
# AMD CPUs report invtsc as constant_tsc; check for equivalence
if [ "${HOST_CPU_FLAG}" == "invtsc" ] && [ "${HOST_CPU_VENDOR}" == "AuthenticAMD" ]; then
if lscpu | grep -o "^Flags\b.*: .*\bconstant_tsc\b" > /dev/null; then
return 0
fi
fi
return 1
fi
fi
Expand Down Expand Up @@ -465,6 +471,11 @@ function configure_cpu() {
x2apic xgetbv1 xsave xsaveopt; do
CPU+=$(configure_cpu_flag "${FLAG}")
done
# AMD CPUs with constant_tsc need explicit TSC flags for macOS stability
# constant_tsc is AMD's equivalent of Intel's invtsc
if [ "${HOST_CPU_VENDOR}" == "AuthenticAMD" ] && check_cpu_flag invtsc; then
CPU+=",+tsc,+tsc-deadline,+invtsc"
fi
fi

# Disable S3 support in the VM to prevent macOS suspending during install
Expand Down
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