Re: [PATCH v1 02/26] x86/cpu: Sanitize CPUID(0x80000000) output

"H. Peter Anvin" <[email protected]>
Newsgroups dev.linux.lists.x86-cpuid,org.kernel.vger.linux-kernel
Message-ID <[email protected]> 
On May 7, 2025 1:50:48 AM PDT, Andrew Cooper <[email protected]> wrote:
>On 06/05/2025 6:04 am, Ahmed S. Darwish wrote:
>> CPUID(0x80000000).EAX returns the max extended CPUID leaf available.  On
>> x86-32 machines
>
>How certain are you that it's all 32bit CPUs?  AIUI, it's an Intel
>specific behaviour, not shared by other x86 vendors of the same era.
>
>~Andrew

All 64-bit machines require CPUID leaf 0x80000000.
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