linux-kernel - Re: [RFC 6/7] KVM: X86: Expose PKS to guest and userspace

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Message-ID: <c8f39e4e-75e1-8089-f8ef-9931ce14339f@redhat.com>
Date:   Tue, 26 Jan 2021 19:24:50 +0100
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Jim Mattson <jmattson@...gle.com>,
        Sean Christopherson <seanjc@...gle.com>
Cc:     Chenyi Qiang <chenyi.qiang@...el.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Joerg Roedel <joro@...tes.org>,
        Xiaoyao Li <xiaoyao.li@...el.com>,
        kvm list <kvm@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [RFC 6/7] KVM: X86: Expose PKS to guest and userspace

On 30/09/20 06:36, Sean Christopherson wrote:
>> CR4.PKS is not in the list of CR4 bits that result in a PDPTE load.
>> Since it has no effect on PAE paging, I would be surprised if it did
>> result in a PDPTE load.
> It does belong in the mmu_role_bits though;-)
> 

Does it?  We don't support PKU/PKS for shadow paging, and it's always 
zero for EPT.  We only support enough PKU/PKS for emulation.

Paolo