linux-kernel - Re: [RFC PATCH v11 01/29] KVM: Wrap kvm_gfn

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Date:   Wed, 19 Jul 2023 16:39:23 +0300
From:   "Jarkko Sakkinen" <jarkko@...nel.org>
To:     "Sean Christopherson" <seanjc@...gle.com>,
        "Paolo Bonzini" <pbonzini@...hat.com>,
        "Marc Zyngier" <maz@...nel.org>,
        "Oliver Upton" <oliver.upton@...ux.dev>,
        "Huacai Chen" <chenhuacai@...nel.org>,
        "Michael Ellerman" <mpe@...erman.id.au>,
        "Anup Patel" <anup@...infault.org>,
        "Paul Walmsley" <paul.walmsley@...ive.com>,
        "Palmer Dabbelt" <palmer@...belt.com>,
        "Albert Ou" <aou@...s.berkeley.edu>,
        "Matthew Wilcox (Oracle)" <willy@...radead.org>,
        "Andrew Morton" <akpm@...ux-foundation.org>,
        "Paul Moore" <paul@...l-moore.com>,
        "James Morris" <jmorris@...ei.org>,
        "Serge E. Hallyn" <serge@...lyn.com>
Cc:     <kvm@...r.kernel.org>, <linux-arm-kernel@...ts.infradead.org>,
        <kvmarm@...ts.linux.dev>, <linux-mips@...r.kernel.org>,
        <linuxppc-dev@...ts.ozlabs.org>, <kvm-riscv@...ts.infradead.org>,
        <linux-riscv@...ts.infradead.org>, <linux-fsdevel@...r.kernel.org>,
        <linux-mm@...ck.org>, <linux-security-module@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        "Chao Peng" <chao.p.peng@...ux.intel.com>,
        "Fuad Tabba" <tabba@...gle.com>,
        "Yu Zhang" <yu.c.zhang@...ux.intel.com>,
        "Vishal Annapurve" <vannapurve@...gle.com>,
        "Ackerley Tng" <ackerleytng@...gle.com>,
        "Maciej Szmigiero" <mail@...iej.szmigiero.name>,
        "Vlastimil Babka" <vbabka@...e.cz>,
        "David Hildenbrand" <david@...hat.com>,
        "Quentin Perret" <qperret@...gle.com>,
        "Michael Roth" <michael.roth@....com>,
        "Wang" <wei.w.wang@...el.com>,
        "Liam Merwick" <liam.merwick@...cle.com>,
        "Isaku Yamahata" <isaku.yamahata@...il.com>,
        "Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>
Subject: Re: [RFC PATCH v11 01/29] KVM: Wrap kvm_gfn_range.pte in a
 per-action union

On Wed Jul 19, 2023 at 2:44 AM EEST, Sean Christopherson wrote:
>  	/* Huge pages aren't expected to be modified without first being zapped. */
> -	WARN_ON(pte_huge(range->pte) || range->start + 1 != range->end);
> +	WARN_ON(pte_huge(range->arg.pte) || range->start + 1 != range->end);

Not familiar with this code. Just checking whether whether instead
pr_{warn,err}() combined with return false would be a more graceful
option?

BR, Jarkko