linux-kernel - Re: [PATCH v2 04/20] kvm: x86/mmu: Allocate and free TDP MMU roots

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Message-ID: <8ee0477f-553a-d22d-a7e9-f2e9186ff27e@redhat.com>
Date:   Fri, 16 Oct 2020 16:56:45 +0200
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Ben Gardon <bgardon@...gle.com>, linux-kernel@...r.kernel.org,
        kvm@...r.kernel.org
Cc:     Cannon Matthews <cannonmatthews@...gle.com>,
        Peter Xu <peterx@...hat.com>,
        Sean Christopherson <sean.j.christopherson@...el.com>,
        Peter Shier <pshier@...gle.com>,
        Peter Feiner <pfeiner@...gle.com>,
        Junaid Shahid <junaids@...gle.com>,
        Jim Mattson <jmattson@...gle.com>,
        Yulei Zhang <yulei.kernel@...il.com>,
        Wanpeng Li <kernellwp@...il.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Xiao Guangrong <xiaoguangrong.eric@...il.com>
Subject: Re: [PATCH v2 04/20] kvm: x86/mmu: Allocate and free TDP MMU roots

On 14/10/20 20:26, Ben Gardon wrote:
> +
> +static void put_tdp_mmu_root(struct kvm *kvm, struct kvm_mmu_page *root)
> +{
> +	if (kvm_mmu_put_root(root))
> +		kvm_tdp_mmu_free_root(kvm, root);
> +}

Unused...

> +static void get_tdp_mmu_root(struct kvm *kvm, struct kvm_mmu_page *root)
> +{
> +	lockdep_assert_held(&kvm->mmu_lock);
> +
> +	kvm_mmu_get_root(root);
> +}
> +

... and duplicate with kvm_mmu_get_root itself since we can move the
assertion there.

Paolo