linux-kernel - Re: [PATCH] KVM: x86/mmu: Remove KVM MMU write lock when accessing indirect_shadow

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Date:   Tue, 6 Jun 2023 15:48:21 -0700
From:   Mingwei Zhang <mizhang@...gle.com>
To:     Sean Christopherson <seanjc@...gle.com>
Cc:     Jim Mattson <jmattson@...gle.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org, Ben Gardon <bgardon@...gle.com>
Subject: Re: [PATCH] KVM: x86/mmu: Remove KVM MMU write lock when accessing indirect_shadow_pages

> >
> > So I think this?
>
> Hmm. I agree with both points above, but below, the change seems too
> heavyweight. smp_wb() is a mfence(), i.e., serializing all
> loads/stores before the instruction. Doing that for every shadow page
> creation and destruction seems a lot.
>
typo: smp_wb() => smp_mb().