linux-kernel - Re: [PATCH] x86/sgx: Allow enclaves to use Asynchrounous Exit Notification

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Date:   Tue, 19 Jul 2022 10:53:24 -0700
From:   Dave Hansen <dave.hansen@...el.com>
To:     Haitao Huang <haitao.huang@...ux.intel.com>,
        linux-kernel@...r.kernel.org,
        Dave Hansen <dave.hansen@...ux.intel.com>
Cc:     Jarkko Sakkinen <jarkko@...nel.org>,
        Andy Lutomirski <luto@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        x86@...nel.org, "H. Peter Anvin" <hpa@...or.com>,
        linux-sgx@...r.kernel.org, Sean Christopherson <seanjc@...gle.com>,
        "Huang, Kai" <kai.huang@...el.com>
Subject: Re: [PATCH] x86/sgx: Allow enclaves to use Asynchrounous Exit
 Notification

On 7/14/22 06:19, Haitao Huang wrote:
> 
> I think you need add this change in arch/x86/kernel/cpu/sgx/ioctl.c,
> inside sgx_encl_create function:
> 
> -    encl->attributes_mask = SGX_ATTR_DEBUG | SGX_ATTR_MODE64BIT |
> SGX_ATTR_KSS;
> +    encl->attributes_mask = SGX_ATTR_DEBUG | SGX_ATTR_MODE64BIT |
> SGX_ATTR_KSS | SGX_ATTR_ASYNC_EXIT_NOTIFY;
> 
> Otherwise, EINIT ioctl fails with this new attribute set in enclave secs.

Makes sense.  I'll add it there.

I also just realized we need to update arch/x86/kvm/cpuid.c as well.  It
keeps a complete list of guest-available SGX attributes.