linux-kernel - Re: [PATCH v4 06/30] KVM: x86/mmu: only perform eager page splitting on valid roots

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Date:   Thu, 3 Mar 2022 20:03:47 +0000
From:   Sean Christopherson <seanjc@...gle.com>
To:     Paolo Bonzini <pbonzini@...hat.com>
Cc:     linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>,
        David Hildenbrand <david@...hat.com>,
        David Matlack <dmatlack@...gle.com>,
        Ben Gardon <bgardon@...gle.com>,
        Mingwei Zhang <mizhang@...gle.com>
Subject: Re: [PATCH v4 06/30] KVM: x86/mmu: only perform eager page splitting
 on valid roots

On Thu, Mar 03, 2022, Paolo Bonzini wrote:
> Eager page splitting is an optimization; it does not have to be performed on
> invalid roots.  It is also the only case in which a reader might acquire
> a reference to an invalid root, so after this change we know that readers
> will skip both dying and invalid roots.
> 
> Signed-off-by: Paolo Bonzini <pbonzini@...hat.com>
> ---

Reviewed-by: Sean Christopherson <seanjc@...gle.com>