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

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Message-ID: <CANgfPd-isMQQ9m94qTz+tPmBMekbLVWrzMig95XbXL4uJ9yoLg@mail.gmail.com>
Date:   Mon, 19 Oct 2020 10:02:07 -0700
From:   Ben Gardon <bgardon@...gle.com>
To:     Paolo Bonzini <pbonzini@...hat.com>
Cc:     LKML <linux-kernel@...r.kernel.org>, kvm <kvm@...r.kernel.org>,
        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 Fri, Oct 16, 2020 at 7:56 AM Paolo Bonzini <pbonzini@...hat.com> wrote:
>
> 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...

Woops, I should have added an unused tag or added this in commit 7.
It's used by many other functions, but nothing in this patch anymore.

>
> > +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
>