linux-kernel - Re: [PATCH 0/3] KVM: x86/mmu: Use kernel's PG_LEVEL

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Message-ID: <35a94d18-d6d1-78f1-aee5-0e40b5edc60b@redhat.com>
Date:   Mon, 4 May 2020 18:49:52 +0200
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Sean Christopherson <sean.j.christopherson@...el.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, Barret Rhoden <brho@...gle.com>
Subject: Re: [PATCH 0/3] KVM: x86/mmu: Use kernel's PG_LEVEL_* enums

On 28/04/20 02:54, Sean Christopherson wrote:
> Drop KVM's PT_{PAGE_TABLE,DIRECTORY,PDPE}_LEVEL KVM enums in favor of the
> kernel's PG_LEVEL_{4K,2M,1G} enums, which have far more user friendly
> names.
> 
> The KVM names were presumably intended to abstract away the page size.  In
> practice, the abstraction is only useful for a single line of code, a PSE
> paging related large page check.  For everything else, the abstract names
> do nothing but obfuscate the code.
> 
> Boot tested a PSE kernel under 32-bit KVM and 64-bit KVM, with and without
> EPT enabled.  Patches 2 and 3 generate no binary difference relative to
> patch 1 when compared via "objdump -d".
> 
> Sean Christopherson (3):
>   KVM: x86/mmu: Tweak PSE hugepage handling to avoid 2M vs 4M conundrum
>   KVM: x86/mmu: Move max hugepage level to a separate #define
>   KVM: x86/mmu: Drop KVM's hugepage enums in favor of the kernel's enums
> 
>  arch/x86/include/asm/kvm_host.h |  13 +---
>  arch/x86/kvm/mmu/mmu.c          | 118 +++++++++++++++-----------------
>  arch/x86/kvm/mmu/page_track.c   |   4 +-
>  arch/x86/kvm/mmu/paging_tmpl.h  |  18 ++---
>  arch/x86/kvm/mmu_audit.c        |   6 +-
>  arch/x86/kvm/svm/svm.c          |   2 +-
>  arch/x86/kvm/vmx/vmx.c          |   6 +-
>  arch/x86/kvm/x86.c              |   4 +-
>  8 files changed, 79 insertions(+), 92 deletions(-)
> 

Queued, thanks.

Paolo