linux-kernel - Re: [PATCH v2 4/4] KVM: SVM: Support #GP handling for the case of nested on nested

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Message-ID: <8eb44204-51c2-d3c8-3adf-f825544f3c88@redhat.com>
Date:   Thu, 21 Jan 2021 15:25:42 +0100
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Wei Huang <wei.huang2@....com>, kvm@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, vkuznets@...hat.com,
        mlevitsk@...hat.com, seanjc@...gle.com, joro@...tes.org,
        bp@...en8.de, tglx@...utronix.de, mingo@...hat.com, x86@...nel.org,
        jmattson@...gle.com, wanpengli@...cent.com, bsd@...hat.com,
        dgilbert@...hat.com, luto@...capital.net
Subject: Re: [PATCH v2 4/4] KVM: SVM: Support #GP handling for the case of
 nested on nested

On 21/01/21 07:55, Wei Huang wrote:
> +	if (nested && guest_cpuid_has(vcpu, X86_FEATURE_SVM)) {
> +		best = kvm_find_cpuid_entry(vcpu, 0x8000000A, 0);
> +		best->edx |= (1 << 28);
> +	}
> +

Instead of this, please use kvm_cpu_cap_set in svm_set_cpu_caps's "if 
(nested)".

Paolo