linux-kernel - Re: [PATCH 07/24] kvm: x86/mmu: Add comment on __tdp_mmu_set

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Message-ID: <59044c30-3ffb-e0ca-9bb0-7b409e6bec08@redhat.com>
Date:   Tue, 26 Jan 2021 15:13:26 +0100
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Ben Gardon <bgardon@...gle.com>, linux-kernel@...r.kernel.org,
        kvm@...r.kernel.org
Cc:     Peter Xu <peterx@...hat.com>,
        Sean Christopherson <seanjc@...gle.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 07/24] kvm: x86/mmu: Add comment on __tdp_mmu_set_spte

On 12/01/21 19:10, Ben Gardon wrote:
> __tdp_mmu_set_spte is a very important function in the TDP MMU which
> already accepts several arguments and will take more in future commits.
> To offset this complexity, add a comment to the function describing each
> of the arguemnts.
> 
> No functional change intended.
> 
> Reviewed-by: Peter Feiner <pfeiner@...gle.com>
> 
> Signed-off-by: Ben Gardon <bgardon@...gle.com>
> ---
>   arch/x86/kvm/mmu/tdp_mmu.c | 16 ++++++++++++++++
>   1 file changed, 16 insertions(+)
> 
> diff --git a/arch/x86/kvm/mmu/tdp_mmu.c b/arch/x86/kvm/mmu/tdp_mmu.c
> index 2650fa9fe066..b033da8243fc 100644
> --- a/arch/x86/kvm/mmu/tdp_mmu.c
> +++ b/arch/x86/kvm/mmu/tdp_mmu.c
> @@ -357,6 +357,22 @@ static void handle_changed_spte(struct kvm *kvm, int as_id, gfn_t gfn,
>   				      new_spte, level);
>   }
>   
> +/*
> + * __tdp_mmu_set_spte - Set a TDP MMU SPTE and handle the associated bookkeeping
> + * @kvm: kvm instance
> + * @iter: a tdp_iter instance currently on the SPTE that should be set
> + * @new_spte: The value the SPTE should be set to
> + * @record_acc_track: Notify the MM subsystem of changes to the accessed state
> + *		      of the page. Should be set unless handling an MMU
> + *		      notifier for access tracking. Leaving record_acc_track
> + *		      unset in that case prevents page accesses from being
> + *		      double counted.
> + * @record_dirty_log: Record the page as dirty in the dirty bitmap if
> + *		      appropriate for the change being made. Should be set
> + *		      unless performing certain dirty logging operations.
> + *		      Leaving record_dirty_log unset in that case prevents page
> + *		      writes from being double counted.
> + */
>   static inline void __tdp_mmu_set_spte(struct kvm *kvm, struct tdp_iter *iter,
>   				      u64 new_spte, bool record_acc_track,
>   				      bool record_dirty_log)
> 

Queued, thanks.

Paolo