lirent
633538217c
Real Intel CPUs enumerate leaf 0x15 (TSC/crystal ratio); QEMU returns 0. Fill it consistently with leaf 0x16 (TSC == base freq). Intel persona only. Module getters spoof_cpu_crystal_hz/tsc_num/tsc_den. Inert without a seed. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
27 lines
1.1 KiB
Diff
27 lines
1.1 KiB
Diff
qemu-spoof: CPUID leaf 0x15 (TSC / core-crystal ratio)
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Stock QEMU returns 0 for leaf 0x15; real Intel CPUs enumerate the TSC / nominal
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core-crystal clock ratio. Fill EAX(denominator)/EBX(numerator)/ECX(crystal Hz) from
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the module so TSC == the leaf-0x16 base frequency (24 MHz crystal * base_mhz / 24).
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Intel only; the getters return 0 for an AMD persona or when off, matching stock.
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(spoof.h include in target/i386 is added by 0013.)
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diff --git a/target/i386/cpu.c b/target/i386/cpu.c
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index c6fd1dc..aa0dd73 100644
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--- a/target/i386/cpu.c
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+++ b/target/i386/cpu.c
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@@ -8811,6 +8811,14 @@ void cpu_x86_cpuid(CPUX86State *env, uint32_t index, uint32_t count,
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}
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break;
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}
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+ case 0x15:
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+ /* qemu-spoof: TSC / nominal core-crystal ratio (stock QEMU returns 0).
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+ * The getters return 0 when off or for an AMD persona, matching stock. */
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+ *eax = (uint32_t)spoof_cpu_tsc_den(0);
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+ *ebx = (uint32_t)spoof_cpu_tsc_num(0);
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+ *ecx = (uint32_t)spoof_cpu_crystal_hz(0);
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+ *edx = 0;
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+ break;
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case 0x1C: /* Last Branch Records Information Leaf */
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*eax = 0;
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*ebx = 0;
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