linux-kernel - Re: [PATCH v2] KVM: SVM: let alternatives handle the cases when RSB filling is required

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Date: Sat, 29 Jun 2024 12:28:24 +0200
From: Borislav Petkov <bp@...en8.de>
To: Sean Christopherson <seanjc@...gle.com>, Amit Shah <amit@...nel.org>
Cc: pbonzini@...hat.com, x86@...nel.org, kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org, amit.shah@....com, tglx@...utronix.de,
	mingo@...hat.com, dave.hansen@...ux.intel.com, hpa@...or.com,
	kim.phillips@....com, david.kaplan@....com
Subject: Re: [PATCH v2] KVM: SVM: let alternatives handle the cases when RSB
 filling is required

On Fri, Jun 28, 2024 at 09:09:15AM -0700, Sean Christopherson wrote:
> Hmm, but it looks like that would incorrectly trigger the "lite" flavor for
> families 0xf - 0x12.  I assume those old CPUs aren't affected by whatever on earth
> EIBRS_PBRSB is.

https://www.intel.com/content/www/us/en/developer/articles/technical/software-security-guidance/advisory-guidance/post-barrier-return-stack-buffer-predictions.html

We could add NO_EIBRS_PBRSB to those old families too. Amit, feel free
to send a separate patch.

Thx.

-- 
Regards/Gruss,
    Boris.

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