linux-kernel - Re: [PATCH] KVM: x86: Initialize tdp

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Date:   Wed, 27 May 2020 18:56:02 +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,
        syzbot+904752567107eefb728c@...kaller.appspotmail.com
Subject: Re: [PATCH] KVM: x86: Initialize tdp_level during vCPU creation

On 27/05/20 18:23, Sean Christopherson wrote:
> Hmm, one option would be to make .get_tdp_level() pure function by passing
> in vcpu->arch.maxphyaddr.  That should make the comment redundant.  I don't
> love bleeding VMX's implementation into the prototype, but that ship has
> kinda already sailed.

Well, it's not bleeding the implementation that much, guest MAXPHYADDR
is pretty much the only reason why it's a function and not a constant.

Another possibility BTW is to make the callback get_max_tdp_level and
make get_tdp_level a function in mmu.c.

Paolo