Re: [PATCH v4 03/20] KVM: x86/mmu: Derive shadow MMU page role from parent

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Subject: Re: [PATCH v4 03/20] KVM: x86/mmu: Derive shadow MMU page role from parent
From: Lai Jiangshan <jiangshanlai@xxxxxxxxx>
Date: Tue, 10 May 2022 10:38:10 +0800
Cc: Albert Ou <aou@xxxxxxxxxxxxxxxxx>, "open list:KERNEL VIRTUAL MACHINE FOR RISC-V \(KVM/riscv\)" <kvm-riscv@xxxxxxxxxxxxxxxxxxx>, "open list:KERNEL VIRTUAL MACHINE FOR MIPS \(KVM/mips\)" <kvm@xxxxxxxxxxxxxxx>, Huacai Chen <chenhuacai@xxxxxxxxxx>, "open list:KERNEL VIRTUAL MACHINE FOR MIPS \(KVM/mips\)" <linux-mips@xxxxxxxxxxxxxxx>, Aleksandar Markovic <aleksandar.qemu.devel@xxxxxxxxx>, Palmer Dabbelt <palmer@xxxxxxxxxxx>, Paul Walmsley <paul.walmsley@xxxxxxxxxx>, Marc Zyngier <maz@xxxxxxxxxx>, Ben Gardon <bgardon@xxxxxxxxxx>, Paolo Bonzini <pbonzini@xxxxxxxxxx>, "Maciej S. Szmigiero" <maciej.szmigiero@xxxxxxxxxx>, "moderated list:KERNEL VIRTUAL MACHINE FOR ARM64 \(KVM/arm64\)" <kvmarm@xxxxxxxxxxxxxxxxxxxxx>, Peter Feiner <pfeiner@xxxxxxxxxx>
In-reply-to: <CALzav=fK9T5YwbiTU1qq7DZuE3E+MVRGDTHpKch7W9jQ9AR8bA@mail.gmail.com>
References: <20220422210546.458943-1-dmatlack@google.com> <20220422210546.458943-4-dmatlack@google.com> <YnRGpDa/kG+9h7Jd@google.com> <CALzav=fK9T5YwbiTU1qq7DZuE3E+MVRGDTHpKch7W9jQ9AR8bA@mail.gmail.com>

On Tue, May 10, 2022 at 6:10 AM David Matlack <dmatlack@xxxxxxxxxx> wrote:

>
> +Lai Jiangshan
>
> It looks like only root pages can be passthrough, so
> kvm_mmu_child_role() can hard-code passthrough to 0. Lai do you agree?
>


Agree.

Thanks
Lai
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References:
- [PATCH v4 00/20] KVM: Extend Eager Page Splitting to the shadow MMU
  - From: David Matlack
- [PATCH v4 03/20] KVM: x86/mmu: Derive shadow MMU page role from parent
  - From: David Matlack
- Re: [PATCH v4 03/20] KVM: x86/mmu: Derive shadow MMU page role from parent
  - From: Sean Christopherson
- Re: [PATCH v4 03/20] KVM: x86/mmu: Derive shadow MMU page role from parent
  - From: David Matlack

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