linux-kernel - Re: [RFC 5/7] KVM: MMU: Add support for PKS emulation

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Message-ID: <0689bda9-e91a-2b06-3dd6-f78572879296@redhat.com>
Date:   Tue, 26 Jan 2021 19:23:12 +0100
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Chenyi Qiang <chenyi.qiang@...el.com>,
        Sean Christopherson <sean.j.christopherson@...el.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>,
        Xiaoyao Li <xiaoyao.li@...el.com>
Cc:     kvm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC 5/7] KVM: MMU: Add support for PKS emulation

On 07/08/20 10:48, Chenyi Qiang wrote:
> 
>  		if (pte_access & PT_USER_MASK)
>  			pkr_bits = (vcpu->arch.pkru >> (pte_pkey * 2)) & 3;
> +		else if (!kvm_get_msr(vcpu, MSR_IA32_PKRS, &pkrs))
> +			pkr_bits = (pkrs >> (pte_pkey * 2)) & 3;

You should be able to always use vcpu->arch.pkrs here.  So

pkr = pte_access & PT_USER_MASK ? vcpu->arch.pkru : vcpu->arch.pkrs;
pkr_bits = (pkr >> pte_pkey * 2) & 3;

Paolo