linux-kernel - Re: [PATCH] [v2] x86/sgx: Allow enclaves to use Asynchrounous Exit Notification

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Date:   Tue, 26 Jul 2022 08:36:36 -0700
From:   Dave Hansen <dave.hansen@...el.com>
To:     Kai Huang <kai.huang@...el.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>, dave@...1.net
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>,
        "H. Peter Anvin" <hpa@...or.com>,
        Sean Christopherson <seanjc@...gle.com>,
        Haitao Huang <haitao.huang@...ux.intel.com>, x86@...nel.org,
        linux-sgx@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] [v2] x86/sgx: Allow enclaves to use Asynchrounous Exit
 Notification

On 7/22/22 06:26, Kai Huang wrote:
> Did a quick look at the spec.  It appears ENCLU[EDECCSSA] should be used
> together with AEX-notify.  So besides advertising the new
> SGX_ATTR_ASYNC_EXIT_NOTIFY bit to the KVM guest, I think we should also
> advertise the ENCLU[EDECCSSA] support in guest's CPUID, like below (untested)?

Kai, would you care to send a new version of this with a proper SoB and
changelog integrating what you've learned since posting it?  It can be
merged along with AEX notify itself.