linux-kernel - Re: [PATCH 00/23] KVM: MMU: MMU role refactoring

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Message-ID: <YgRApq20ds4FDivX@google.com>
Date:   Wed, 9 Feb 2022 22:31:02 +0000
From:   Sean Christopherson <seanjc@...gle.com>
To:     Paolo Bonzini <pbonzini@...hat.com>
Cc:     linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
        dmatlack@...gle.com, vkuznets@...hat.com
Subject: Re: [PATCH 00/23] KVM: MMU: MMU role refactoring

On Fri, Feb 04, 2022, Paolo Bonzini wrote:
> Paolo Bonzini (23):
>   KVM: MMU: pass uses_nx directly to reset_shadow_zero_bits_mask
>   KVM: MMU: nested EPT cannot be used in SMM
>   KVM: MMU: remove valid from extended role
>   KVM: MMU: constify uses of struct kvm_mmu_role_regs
>   KVM: MMU: pull computation of kvm_mmu_role_regs to kvm_init_mmu
>   KVM: MMU: load new PGD once nested two-dimensional paging is
>     initialized
>   KVM: MMU: remove kvm_mmu_calc_root_page_role
>   KVM: MMU: rephrase unclear comment
>   KVM: MMU: remove "bool base_only" arguments
>   KVM: MMU: split cpu_role from mmu_role
>   KVM: MMU: do not recompute root level from kvm_mmu_role_regs
>   KVM: MMU: remove ept_ad field
>   KVM: MMU: remove kvm_calc_shadow_root_page_role_common
>   KVM: MMU: cleanup computation of MMU roles for two-dimensional paging
>   KVM: MMU: cleanup computation of MMU roles for shadow paging
>   KVM: MMU: remove extended bits from mmu_role
>   KVM: MMU: remove redundant bits from extended role
>   KVM: MMU: fetch shadow EFER.NX from MMU role
>   KVM: MMU: simplify and/or inline computation of shadow MMU roles
>   KVM: MMU: pull CPU role computation to kvm_init_mmu
>   KVM: MMU: store shadow_root_level into mmu_role
>   KVM: MMU: use cpu_role for root_level
>   KVM: MMU: replace direct_map with mmu_role.direct

Heresy!  Everyone knows the one true way is "KVM: x86/mmu:"

  $ glo | grep "KVM: MMU:" | wc -l
  740
  $ glo | grep "KVM: x86/mmu:" | wc -l
  403

Dammit, I'm the heathen...

I do think we should use x86/mmu though.  VMX and SVM (and nVMX and nSVM) are ok
because they're unlikely to collide with other architectures, but every arch has
an MMU...