linux-kernel - Re: [PATCH 05/15] KVM: x86/mmu: Remove need for a vcpu from kvm_slot_page_track_is

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Date:   Thu, 18 Nov 2021 09:25:51 +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>,
        David Matlack <dmatlack@...gle.com>,
        Mingwei Zhang <mizhang@...gle.com>,
        Yulei Zhang <yulei.kernel@...il.com>,
        Wanpeng Li <kernellwp@...il.com>,
        Xiao Guangrong <xiaoguangrong.eric@...il.com>,
        Kai Huang <kai.huang@...el.com>,
        Keqian Zhu <zhukeqian1@...wei.com>,
        David Hildenbrand <david@...hat.com>
Subject: Re: [PATCH 05/15] KVM: x86/mmu: Remove need for a vcpu from
 kvm_slot_page_track_is_active

On 11/16/21 00:45, Ben Gardon wrote:
> kvm_slot_page_track_is_active only uses its vCPU argument to get a
> pointer to the assoicated struct kvm, so just pass in the struct KVM to
> remove the need for a vCPU pointer.
> 
> No functional change intended.
> 
> 
> Signed-off-by: Ben Gardon <bgardon@...gle.com>
> ---
>   arch/x86/include/asm/kvm_page_track.h | 2 +-
>   arch/x86/kvm/mmu/mmu.c                | 4 ++--
>   arch/x86/kvm/mmu/page_track.c         | 4 ++--
>   3 files changed, 5 insertions(+), 5 deletions(-)
> 
> diff --git a/arch/x86/include/asm/kvm_page_track.h b/arch/x86/include/asm/kvm_page_track.h
> index 9d4a3b1b25b9..e99a30a4d38b 100644
> --- a/arch/x86/include/asm/kvm_page_track.h
> +++ b/arch/x86/include/asm/kvm_page_track.h
> @@ -63,7 +63,7 @@ void kvm_slot_page_track_add_page(struct kvm *kvm,
>   void kvm_slot_page_track_remove_page(struct kvm *kvm,
>   				     struct kvm_memory_slot *slot, gfn_t gfn,
>   				     enum kvm_page_track_mode mode);
> -bool kvm_slot_page_track_is_active(struct kvm_vcpu *vcpu,
> +bool kvm_slot_page_track_is_active(struct kvm *kvm,
>   				   struct kvm_memory_slot *slot, gfn_t gfn,
>   				   enum kvm_page_track_mode mode);
>   
> diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c
> index 2ada6dee920a..7d0da79668c0 100644
> --- a/arch/x86/kvm/mmu/mmu.c
> +++ b/arch/x86/kvm/mmu/mmu.c
> @@ -2587,7 +2587,7 @@ int mmu_try_to_unsync_pages(struct kvm_vcpu *vcpu, struct kvm_memory_slot *slot,
>   	 * track machinery is used to write-protect upper-level shadow pages,
>   	 * i.e. this guards the role.level == 4K assertion below!
>   	 */
> -	if (kvm_slot_page_track_is_active(vcpu, slot, gfn, KVM_PAGE_TRACK_WRITE))
> +	if (kvm_slot_page_track_is_active(vcpu->kvm, slot, gfn, KVM_PAGE_TRACK_WRITE))
>   		return -EPERM;
>   
>   	/*
> @@ -3884,7 +3884,7 @@ static bool page_fault_handle_page_track(struct kvm_vcpu *vcpu,
>   	 * guest is writing the page which is write tracked which can
>   	 * not be fixed by page fault handler.
>   	 */
> -	if (kvm_slot_page_track_is_active(vcpu, fault->slot, fault->gfn, KVM_PAGE_TRACK_WRITE))
> +	if (kvm_slot_page_track_is_active(vcpu->kvm, fault->slot, fault->gfn, KVM_PAGE_TRACK_WRITE))
>   		return true;
>   
>   	return false;
> diff --git a/arch/x86/kvm/mmu/page_track.c b/arch/x86/kvm/mmu/page_track.c
> index cc4eb5b7fb76..35c221d5f6ce 100644
> --- a/arch/x86/kvm/mmu/page_track.c
> +++ b/arch/x86/kvm/mmu/page_track.c
> @@ -173,7 +173,7 @@ EXPORT_SYMBOL_GPL(kvm_slot_page_track_remove_page);
>   /*
>    * check if the corresponding access on the specified guest page is tracked.
>    */
> -bool kvm_slot_page_track_is_active(struct kvm_vcpu *vcpu,
> +bool kvm_slot_page_track_is_active(struct kvm *kvm,
>   				   struct kvm_memory_slot *slot, gfn_t gfn,
>   				   enum kvm_page_track_mode mode)
>   {
> @@ -186,7 +186,7 @@ bool kvm_slot_page_track_is_active(struct kvm_vcpu *vcpu,
>   		return false;
>   
>   	if (mode == KVM_PAGE_TRACK_WRITE &&
> -	    !kvm_page_track_write_tracking_enabled(vcpu->kvm))
> +	    !kvm_page_track_write_tracking_enabled(kvm))
>   		return false;
>   
>   	index = gfn_to_index(gfn, slot->base_gfn, PG_LEVEL_4K);
> 

Queued, thanks.

Paolo