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

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Message-ID: <47b7dc92-793c-75ce-6a8b-46b8a1f2bc88@amazon.com>
Date:   Mon, 27 Apr 2020 13:00:00 +0300
From:   "Paraschiv, Andra-Irina" <andraprs@...zon.com>
To:     Paolo Bonzini <pbonzini@...hat.com>,
        Alexander Graf <graf@...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>,
        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 27/04/2020 12:46, Paolo Bonzini wrote:
> On 27/04/20 11:22, Paraschiv, Andra-Irina wrote:
>>>
>>> 1) having the kernel and initrd loaded by the parent VM in enclave
>>> memory has the advantage that you save memory outside the enclave memory
>>> for something that is only needed inside the enclave
>> Here you wanted to say disadvantage? :)Wrt saving memory, it's about
>> additional memory from the parent / primary VM needed for handling the
>> enclave image sections (such as the kernel, ramdisk) and setting the EIF
>> at a certain offset in enclave memory?
> No, it's an advantage.  If the parent VM can load everything in enclave
> memory, it can read() into it directly.  It doesn't to waste its own
> memory for a kernel and initrd, whose only reason to exist is to be
> copied into enclave memory.

Ok, got it, saving was referring to actually not using additional memory.

Thank you for clarification.

Andra




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