linux-kernel - Re: [PATCH v3 08/62] KVM: SVM: Drop pointless masking of default APIC base when setting V_APIC

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Message-ID: <7kz6bvwpnsbth4puaivtygdzygqmcippdgkihieqcy5ua5rlpr@biu2qjtzraxz>
Date: Fri, 13 Jun 2025 19:45:10 +0530
From: Naveen N Rao <naveen@...nel.org>
To: Sean Christopherson <seanjc@...gle.com>
Cc: Marc Zyngier <maz@...nel.org>, Oliver Upton <oliver.upton@...ux.dev>, 
	Paolo Bonzini <pbonzini@...hat.com>, Joerg Roedel <joro@...tes.org>, 
	David Woodhouse <dwmw2@...radead.org>, Lu Baolu <baolu.lu@...ux.intel.com>, 
	linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.linux.dev, kvm@...r.kernel.org, 
	iommu@...ts.linux.dev, linux-kernel@...r.kernel.org, Sairaj Kodilkar <sarunkod@....com>, 
	Vasant Hegde <vasant.hegde@....com>, Maxim Levitsky <mlevitsk@...hat.com>, 
	Joao Martins <joao.m.martins@...cle.com>, Francesco Lavra <francescolavra.fl@...il.com>, 
	David Matlack <dmatlack@...gle.com>
Subject: Re: [PATCH v3 08/62] KVM: SVM: Drop pointless masking of default
 APIC base when setting V_APIC_BAR

On Wed, Jun 11, 2025 at 03:45:11PM -0700, Sean Christopherson wrote:
> Drop VMCB_AVIC_APIC_BAR_MASK, it's just a regurgitation of the maximum
> theoretical 4KiB-aligned physical address, i.e. is not novel in any way,
> and its only usage is to mask the default APIC base, which is 4KiB aligned
> and (obviously) a legal physical address.
> 
> No functional change intended.
> 
> Tested-by: Sairaj Kodilkar <sarunkod@....com>
> Signed-off-by: Sean Christopherson <seanjc@...gle.com>
> ---
>  arch/x86/include/asm/svm.h | 2 --
>  arch/x86/kvm/svm/avic.c    | 2 +-
>  2 files changed, 1 insertion(+), 3 deletions(-)

Reviewed-by: Naveen N Rao (AMD) <naveen@...nel.org>

- Naveen