Re: [PATCH v2 1/7] x86/cpufeatures: Add X86_FEATURE_AMD_RMPOPT feature flag

[Borislav Petkov]

On Mon, Mar 02, 2026 at 09:35:19PM +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.
> 
> For more information on the RMPOPT instruction, see the AMD64 RMPOPT
> technical documentation. [1]
> 
> Link: https://docs.amd.com/v/u/en-US/69201_1.00_AMD64_RMPOPT_PUB [1]

Please do not add URLs to documents on corporate sites because latter change
notoriously fast, resulting in dead links. Instead, quote the document title
so that anyone looking for it, can find it after a web search engine has
indexed it.

> Signed-off-by: Ashish Kalra <ashish.kalra@xxxxxxx>
> ---
>  arch/x86/include/asm/cpufeatures.h | 2 +-
>  arch/x86/kernel/cpu/scattered.c    | 1 +
>  2 files changed, 2 insertions(+), 1 deletion(-)

Btw, looking further in the set, the first several patches are for tip and
then KVM ones come.

I'm thinking, when the time comes, I'll give you, Sean, an immutable branch
which you can merge.

Right?

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette