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Check maximum basic CPUID leaf before querying leaf 7 in AVX probing

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Andrea Mazzoleni 2026-08-24 22:06:17 +02:00
parent 5ed6a29db2
commit 46a09a380a
1 changed files with 5 additions and 0 deletions
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5
raid/cpu.h
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@ -91,6 +91,11 @@ static inline int raid_cpu_match_avx(uint32_t leaf_1_ecx, uint32_t leaf_7_ebx, u
{
uint32_t reg[4];
/* check that leaf 7 is supported */
raid_cpuid(0, 0, reg);
if (reg[0] < 7)
return 0;
raid_cpuid(1, 0, reg);
if ((reg[2] & leaf_1_ecx) != leaf_1_ecx)
return 0;