linux-kernel - Re: [PATCH 05/14] KVM: x86/mmu: Consult max mapping level when zapping collapsible SPTEs

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Message-ID: <caa90b6b-c2fa-d8b7-3ee6-263d485c5913@redhat.com>
Date:   Thu, 18 Feb 2021 13:43:45 +0100
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Sean Christopherson <seanjc@...gle.com>
Cc:     Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org, Ben Gardon <bgardon@...gle.com>,
        Makarand Sonare <makarandsonare@...gle.com>
Subject: Re: [PATCH 05/14] KVM: x86/mmu: Consult max mapping level when
 zapping collapsible SPTEs

On 13/02/21 01:50, Sean Christopherson wrote:
> 
>  		pfn = spte_to_pfn(iter.old_spte);
>  		if (kvm_is_reserved_pfn(pfn) ||
> -		    (!PageTransCompoundMap(pfn_to_page(pfn)) &&
> -		     !kvm_is_zone_device_pfn(pfn)))
> +		    iter.level >= kvm_mmu_max_mapping_level(kvm, slot, iter.gfn,
> +							    pfn, PG_LEVEL_NUM))
>  			continue;
>  


This changes the test to PageCompound.  Is it worth moving the change to 
patch 1?

Paolo