Re: [PATCH v10 2/6] x86/sev: Initialize RMPOPT configuration MSRs

Borislav Petkov <[email protected]> Wed, 22 Jul 2026 22:14:22 -0700

Newsgroups	dev.linux.lists.linux-coco,org.kernel.vger.kvm,org.kernel.vger.linux-crypto,org.kernel.vger.linux-kernel
Message-ID	<20260723051422.GGamGjLhlTqRDcFlee@fat_crate.local>

On Thu, Jul 23, 2026 at 10:23:56AM +0530, K Prateek Nayak wrote:
> The offline cores will remain offline since hotplug is disabled. RMPOPT
> is simply a performance optimization for RMP checks and leaving the
> offline cores (that will never exit idle) unoptimized should be
> acceptable.

What happens if you boot with a subset of cores, the boot flow enables RMPOPT
and then you online the rest?

Have we tried that?

-- 
Regards/Gruss,
    Boris.

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