linux-kernel - Re: [PATCH v2 0/7] KVM: x86/mmu: nVMX: 5-level paging fixes and enabling

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Message-ID: <e3ade6f7-071a-3825-9097-4c0f1a3f4676@redhat.com>
Date:   Wed, 12 Feb 2020 13:03:03 +0100
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
Subject: Re: [PATCH v2 0/7] KVM: x86/mmu: nVMX: 5-level paging fixes and
 enabling

On 07/02/20 18:37, Sean Christopherson wrote:
> Two fixes for 5-level paging bugs with a 100% fatality rate, a patch to
> enable 5-level EPT in L1, and additional clean up on top (mostly renames
> of functions/variables that caused me no end of confusion when trying to
> figure out what was broken).
> 
> Tested fixed kernels at L0, L1 and L2, with most combinations of EPT,
> shadow paging, 4-level and 5-level.  EPT kvm-unit-tests runs clean in L0.
> Patches for kvm-unit-tests incoming to play nice with 5-level nested EPT.
> 
> Ideally patches 1 and 2 would get into 5.6, 5-level paging is quite
> broken without them.
> 
> v2:
>   - Increase the nested EPT array sizes to accomodate 5-level paging in
>     the patch that adds support for 5-level nested EPT, not in the bug
>     fix for 5-level shadow paging.
> 
> Sean Christopherson (7):
>   KVM: nVMX: Use correct root level for nested EPT shadow page tables
>   KVM: x86/mmu: Fix struct guest_walker arrays for 5-level paging
>   KVM: nVMX: Allow L1 to use 5-level page walks for nested EPT
>   KVM: nVMX: Rename nested_ept_get_cr3() to nested_ept_get_eptp()
>   KVM: nVMX: Rename EPTP validity helper and associated variables
>   KVM: x86/mmu: Rename kvm_mmu->get_cr3() to ->get_guest_cr3_or_eptp()
>   KVM: nVMX: Drop unnecessary check on ept caps for execute-only
> 
>  arch/x86/include/asm/kvm_host.h |  2 +-
>  arch/x86/include/asm/vmx.h      | 12 +++++++
>  arch/x86/kvm/mmu/mmu.c          | 35 ++++++++++----------
>  arch/x86/kvm/mmu/paging_tmpl.h  |  6 ++--
>  arch/x86/kvm/svm.c              | 10 +++---
>  arch/x86/kvm/vmx/nested.c       | 58 ++++++++++++++++++++-------------
>  arch/x86/kvm/vmx/nested.h       |  4 +--
>  arch/x86/kvm/vmx/vmx.c          |  2 ++
>  arch/x86/kvm/x86.c              |  2 +-
>  9 files changed, 79 insertions(+), 52 deletions(-)
> 

Queued 1-2-4-5-7 (for 5.6), thanks!

Paolo