linux-kernel - Re: [PATCH v2 11/25] KVM: x86/mmu: remove kvm_calc_shadow_root_page_role

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Date:   Tue, 8 Mar 2022 19:18:37 +0100
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Sean Christopherson <seanjc@...gle.com>
Cc:     linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
        dmatlack@...gle.com
Subject: Re: [PATCH v2 11/25] KVM: x86/mmu: remove
 kvm_calc_shadow_root_page_role_common

On 3/8/22 19:17, Sean Christopherson wrote:
>>> +	role.base.direct = !____is_cr0_pg(regs);
> 
> On a serious note, can we add a WARN_ON_ONCE(role.base.direct)?  Not so much that
> the WARN will be helpful, but to document the subtle dependency?  If the relevant
> code goes away in the end, ignore this requrest.

Ok, that can be done.  Either that or !is_cr0_pg().

Paolo