linux-kernel - Re: [PATCH v1 00/15] Add support for Nitro Enclaves

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Message-ID: <f560aed3-a241-acbd-6d3b-d0c831234235@redhat.com>
Date:   Thu, 23 Apr 2020 19:51:09 +0200
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     "Paraschiv, Andra-Irina" <andraprs@...zon.com>,
        linux-kernel@...r.kernel.org
Cc:     Anthony Liguori <aliguori@...zon.com>,
        Benjamin Herrenschmidt <benh@...zon.com>,
        Colm MacCarthaigh <colmmacc@...zon.com>,
        Bjoern Doebel <doebel@...zon.de>,
        David Woodhouse <dwmw@...zon.co.uk>,
        Frank van der Linden <fllinden@...zon.com>,
        Alexander Graf <graf@...zon.de>,
        Martin Pohlack <mpohlack@...zon.de>,
        Matt Wilson <msw@...zon.com>, Balbir Singh <sblbir@...zon.com>,
        Stewart Smith <trawets@...zon.com>,
        Uwe Dannowski <uwed@...zon.de>, kvm@...r.kernel.org,
        ne-devel-upstream@...zon.com
Subject: Re: [PATCH v1 00/15] Add support for Nitro Enclaves

On 23/04/20 19:42, Paraschiv, Andra-Irina wrote:
>>
>>>> - the initial CPU state: CPL0 vs. CPL3, initial program counter, etc.
> 
> The enclave VM has its own kernel and follows the well-known Linux boot
> protocol, in the end getting to the user application after init finishes
> its work, so that's CPL3.

CPL3 is how the user application run, but does the enclave's Linux boot
process start in real mode at the reset vector (0xfffffff0), in 16-bit
protected mode at the Linux bzImage entry point, or at the ELF entry point?

Paolo