Re: [PATCH 1/6] x86/cpufeatures: Add X86_FEATURE_AMD_RMPOPT feature flag

[Ahmed S. Darwish]

On Tue, 17 Feb 2026, Ashish Kalra wrote:
>
> --- a/arch/x86/kernel/cpu/scattered.c
> +++ b/arch/x86/kernel/cpu/scattered.c
> @@ -65,6 +65,7 @@ static const struct cpuid_bit cpuid_bits[] = {
>  	{ X86_FEATURE_PERFMON_V2,		CPUID_EAX,  0, 0x80000022, 0 },
>  	{ X86_FEATURE_AMD_LBR_V2,		CPUID_EAX,  1, 0x80000022, 0 },
>  	{ X86_FEATURE_AMD_LBR_PMC_FREEZE,	CPUID_EAX,  2, 0x80000022, 0 },
> +	{ X86_FEATURE_RMPOPT,			CPUID_EDX,  0, 0x80000025, 0 },
>  	{ X86_FEATURE_AMD_HTR_CORES,		CPUID_EAX, 30, 0x80000026, 0 },
>  	{ 0, 0, 0, 0, 0 }

CPUID(0x80000025).EDX is documented as reserved in the latest public
version of the APM, volume 3 (2025-07-02.)

I'll add it to the upcoming x86-cpuid-db release:

    https://gitlab.com/x86-cpuid.org/x86-cpuid-db

Thanks,

--
Ahmed S. Darwish
Linutronix GmbH