linux-kernel - Re: [PATCH v36 21/24] x86/vdso: Implement a vDSO for Intel SGX enclave call

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Message-ID: <78ba0baf-8ffa-7221-4ac1-007dd9e7eb20@fortanix.com>
Date:   Tue, 11 Aug 2020 09:16:28 +0200
From:   Jethro Beekman <jethro@...tanix.com>
To:     Sean Christopherson <sean.j.christopherson@...el.com>,
        Nathaniel McCallum <npmccallum@...hat.com>
Cc:     Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>, x86@...nel.org,
        linux-sgx@...r.kernel.org, linux-kernel@...r.kernel.org,
        Andy Lutomirski <luto@...capital.net>,
        Cedric Xing <cedric.xing@...el.com>, akpm@...ux-foundation.org,
        andriy.shevchenko@...ux.intel.com, asapek@...gle.com, bp@...en8.de,
        chenalexchen@...gle.com, conradparker@...gle.com,
        cyhanish@...gle.com, dave.hansen@...el.com,
        "Huang, Haitao" <haitao.huang@...el.com>,
        Josh Triplett <josh@...htriplett.org>, kai.huang@...el.com,
        "Svahn, Kai" <kai.svahn@...el.com>, kmoy@...gle.com,
        ludloff@...gle.com, luto@...nel.org,
        Neil Horman <nhorman@...hat.com>,
        Patrick Uiterwijk <puiterwijk@...hat.com>,
        David Rientjes <rientjes@...gle.com>,
        Thomas Gleixner <tglx@...utronix.de>, yaozhangx@...gle.com
Subject: Re: [PATCH v36 21/24] x86/vdso: Implement a vDSO for Intel SGX
 enclave call

On 2020-08-11 00:23, Sean Christopherson wrote:
> Another thought would be to wrap sgx_enclave_exception in a struct to give
> room for supporting additional exit information (if such a thing ever pops
> up) and to allow the caller to opt in to select behavior, e.g. Jethro's
> request to invoke the exit handler on IRQ exits.  This is basically the
> equivalent of "struct kvm_run", minus the vCPU/enclave state.

Actually, the flag I need is “return from the vdso on IRQ exits” (See Andy's email about preferring returns over callbacks). But maybe the flag should be “interpret IRQ exit as a normal exit” and let it be handled the same as any other exit based on whether an exit handler fnptr was passed or not.

--
Jethro Beekman | Fortanix




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