linux-kernel - Re: [PATCH v2 06/25] x86/cpu/intel: Allow SGX virtualization without Launch Control support

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Message-ID: <YEveK42VVla8ibkl@google.com>
Date:   Fri, 12 Mar 2021 13:33:31 -0800
From:   Sean Christopherson <seanjc@...gle.com>
To:     Kai Huang <kai.huang@...el.com>
Cc:     kvm@...r.kernel.org, x86@...nel.org, linux-sgx@...r.kernel.org,
        linux-kernel@...r.kernel.org, jarkko@...nel.org, luto@...nel.org,
        dave.hansen@...el.com, rick.p.edgecombe@...el.com,
        haitao.huang@...el.com, pbonzini@...hat.com, bp@...en8.de,
        tglx@...utronix.de, mingo@...hat.com, hpa@...or.com,
        jethro@...tanix.com, b.thiel@...teo.de
Subject: Re: [PATCH v2 06/25] x86/cpu/intel: Allow SGX virtualization without
 Launch Control support

On Tue, Mar 09, 2021, Kai Huang wrote:
> +	if (cpu_has(c, X86_FEATURE_SGX) && IS_ENABLED(CONFIG_X86_SGX)) {
> +		/*
> +		 * Separate out SGX driver enabling from KVM.  This allows KVM
> +		 * guests to use SGX even if the kernel SGX driver refuses to
> +		 * use it.  This happens if flexible Faunch Control is not

/Faunch/Launch

Clever handling of the multitude of combinations!