Re: [PATCH v5 1/7] x86/cpufeatures: Add X86_FEATURE_AMD_RMPOPT feature flag

[Borislav Petkov]

On Mon, May 18, 2026 at 09:41:53PM +0000, Ashish Kalra wrote:
> From: Ashish Kalra <ashish.kalra@xxxxxxx>
> 
> Add a flag indicating whether RMPOPT instruction is supported.
> 
> RMPOPT is a new instruction designed to minimize the performance
> overhead of RMP checks on the hypervisor and on non-SNP guests by
> allowing RMP checks to be skipped when 1G regions of memory are known
> not to contain any SEV-SNP guest memory.

Streamline:

"RMPOPT is a new instruction that reduces the performance overhead of RMP
checks for the hypervisor and non‑SNP guests by allowing those checks to be
skipped when 1‑GB memory regions are known to contain no SEV‑SNP guest
memory."

-- 
Regards/Gruss,
    Boris.

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