linux-kernel - Re: [PATCH 1/2] KVM: SEV: IBPB-on-Entry guest support

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Message-ID: <20260130123252.GAaXyk9DJEAiQeDyeh@fat_crate.local>
Date: Fri, 30 Jan 2026 13:32:52 +0100
From: Borislav Petkov <bp@...en8.de>
To: Kim Phillips <kim.phillips@....com>
Cc: linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
	linux-coco@...ts.linux.dev, x86@...nel.org,
	Sean Christopherson <seanjc@...gle.com>,
	Paolo Bonzini <pbonzini@...hat.com>,
	K Prateek Nayak <kprateek.nayak@....com>,
	Nikunj A Dadhania <nikunj@....com>,
	Tom Lendacky <thomas.lendacky@....com>,
	Michael Roth <michael.roth@....com>,
	Naveen Rao <naveen.rao@....com>,
	David Kaplan <david.kaplan@....com>, stable@...nel.org
Subject: Re: [PATCH 1/2] KVM: SEV: IBPB-on-Entry guest support

On Thu, Jan 29, 2026 at 04:32:49PM -0600, Kim Phillips wrote:
> Not *all* SNP features are implemented in all guest kernel versions, and,
> well, for those that don't require explicit guest code support, perhaps it's
> because they aren't necessarily well defined and validated in all hardware
> versions...

Ok, can you add *this* feature to SNP_FEATURES_PRESENT? If not, why not?

-- 
Regards/Gruss,
    Boris.

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