linux-kernel - Re: [PATCH 10/16] KVM: x86/tdp_mmu: Support TDX private mapping for TDP MMU

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Date: Wed, 15 May 2024 10:35:36 -0700
From: Isaku Yamahata <isaku.yamahata@...el.com>
To: Rick Edgecombe <rick.p.edgecombe@...el.com>
Cc: pbonzini@...hat.com, seanjc@...gle.com, kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org, isaku.yamahata@...il.com,
	erdemaktas@...gle.com, sagis@...gle.com, yan.y.zhao@...el.com,
	dmatlack@...gle.com
Subject: Re: [PATCH 10/16] KVM: x86/tdp_mmu: Support TDX private mapping for
 TDP MMU

On Tue, May 14, 2024 at 05:59:46PM -0700,
Rick Edgecombe <rick.p.edgecombe@...el.com> wrote:

..snip...

> @@ -619,6 +776,8 @@ static inline int tdp_mmu_zap_spte_atomic(struct kvm *kvm,
>  	 */
>  	__kvm_tdp_mmu_write_spte(iter->sptep, SHADOW_NONPRESENT_VALUE);
>  
> +
> +	role = sptep_to_sp(iter->sptep)->role;
>  	/*
>  	 * Process the zapped SPTE after flushing TLBs, and after replacing
>  	 * REMOVED_SPTE with 0. This minimizes the amount of time vCPUs are
> @@ -626,7 +785,7 @@ static inline int tdp_mmu_zap_spte_atomic(struct kvm *kvm,
>  	 * SPTEs.
>  	 */
>  	handle_changed_spte(kvm, iter->as_id, iter->gfn, iter->old_spte,
> -			    0, iter->level, true);
> +			    SHADOW_NONPRESENT_VALUE, role, true);
>  
>  	return 0;
>  }

This SHADOW_NONPRESENT_VALUE change should go to another patch at [1]
I replied to [1].

[1] https://lore.kernel.org/kvm/20240507154459.3950778-3-pbonzini@redhat.com/
-- 
Isaku Yamahata <isaku.yamahata@...el.com>