linux-kernel - Re: [PATCH 6/7] kvm: x86/mmu: Remove FNAME(invlpg)

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Date:   Thu, 2 Feb 2023 01:30:41 +0000
From:   Sean Christopherson <seanjc@...gle.com>
To:     Lai Jiangshan <jiangshanlai@...il.com>
Cc:     linux-kernel@...r.kernel.org, Paolo Bonzini <pbonzini@...hat.com>,
        Lai Jiangshan <jiangshan.ljs@...group.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
        "H. Peter Anvin" <hpa@...or.com>, kvm@...r.kernel.org
Subject: Re: [PATCH 6/7] kvm: x86/mmu: Remove FNAME(invlpg)

On Thu, Jan 05, 2023, Lai Jiangshan wrote:
> From: Lai Jiangshan <jiangshan.ljs@...group.com>
> 
> Replace it with FNAME(sync_spte).
> 
> FNAME(sync_spte) combined with the shadow pagetable walk meets the
> semantics of the instruction INVLPG.

Please call out the differences (I assume the two aren't perfectly identical),
and explain why those differences are benign.