linux-kernel - Re: [PATCH 09/24] kvm: x86/mmu: Don't redundantly clear TDP MMU pt memory

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Message-ID: <YAiNQ/SgVqg+h6WG@google.com>
Date:   Wed, 20 Jan 2021 12:06:27 -0800
From:   Sean Christopherson <seanjc@...gle.com>
To:     Ben Gardon <bgardon@...gle.com>
Cc:     linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
        Paolo Bonzini <pbonzini@...hat.com>,
        Peter Xu <peterx@...hat.com>, Peter Shier <pshier@...gle.com>,
        Peter Feiner <pfeiner@...gle.com>,
        Junaid Shahid <junaids@...gle.com>,
        Jim Mattson <jmattson@...gle.com>,
        Yulei Zhang <yulei.kernel@...il.com>,
        Wanpeng Li <kernellwp@...il.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Xiao Guangrong <xiaoguangrong.eric@...il.com>
Subject: Re: [PATCH 09/24] kvm: x86/mmu: Don't redundantly clear TDP MMU pt
 memory

On Tue, Jan 12, 2021, Ben Gardon wrote:
> The KVM MMU caches already guarantee that shadow page table memory will
> be zeroed, so there is no reason to re-zero the page in the TDP MMU page
> fault handler.
> 
> No functional change intended.
> 
> Reviewed-by: Peter Feiner <pfeiner@...gle.com>
> 
> Signed-off-by: Ben Gardon <bgardon@...gle.com>

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