linux-kernel - Re: [PATCH] KVM: x86: synthesize TSA CPUID bits via SCATTERED

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Message-ID: <20260209153243.GBaYn-G02QE86Fje7g@fat_crate.local>
Date: Mon, 9 Feb 2026 16:32:43 +0100
From: Borislav Petkov <bp@...en8.de>
To: Sean Christopherson <seanjc@...gle.com>
Cc: Carlos López <clopez@...e.de>,
	Jim Mattson <jmattson@...gle.com>, kvm@...r.kernel.org,
	Paolo Bonzini <pbonzini@...hat.com>,
	Thomas Gleixner <tglx@...nel.org>, Ingo Molnar <mingo@...hat.com>,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	"maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT)" <x86@...nel.org>,
	"H. Peter Anvin" <hpa@...or.com>,
	"open list:X86 ARCHITECTURE (32-BIT AND 64-BIT)" <linux-kernel@...r.kernel.org>,
	Babu Moger <bmoger@....com>
Subject: Re: [PATCH] KVM: x86: synthesize TSA CPUID bits via SCATTERED_F()

On Mon, Feb 09, 2026 at 07:06:36AM -0800, Sean Christopherson wrote:
> Maybe I could add a table showing how the XXX_F() macros map to various controls?

Perhaps start first, please, with explaining the difference between
SYNTHESIZED_F and SCATTERED_F and why you even need it?

I mean, KVM and guests only care whether X86_FEATURE flags are set or not, no?
Not how they get defined underneath...

-- 
Regards/Gruss,
    Boris.

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