From: "Paraschiv, Andra-Irina" <andraprs@amazon.com>
To: Paolo Bonzini <pbonzini@redhat.com>,
Alexander Graf <graf@amazon.com>, <linux-kernel@vger.kernel.org>
Cc: Anthony Liguori <aliguori@amazon.com>,
Benjamin Herrenschmidt <benh@amazon.com>,
Colm MacCarthaigh <colmmacc@amazon.com>,
Bjoern Doebel <doebel@amazon.de>,
David Woodhouse <dwmw@amazon.co.uk>,
Frank van der Linden <fllinden@amazon.com>,
Martin Pohlack <mpohlack@amazon.de>, Matt Wilson <msw@amazon.com>,
Balbir Singh <sblbir@amazon.com>,
Stewart Smith <trawets@amazon.com>,
Uwe Dannowski <uwed@amazon.de>, <kvm@vger.kernel.org>,
<ne-devel-upstream@amazon.com>
Subject: Re: [PATCH v1 00/15] Add support for Nitro Enclaves
Date: Mon, 27 Apr 2020 12:15:53 +0300 [thread overview]
Message-ID: <1c3f76ac-abf2-e5aa-1e70-55c6995b5901@amazon.com> (raw)
In-Reply-To: <fb0bfd95-4732-f3c6-4a59-7227cf50356c@redhat.com>
On 25/04/2020 19:05, Paolo Bonzini wrote:
> CAUTION: This email originated from outside of the organization. Do not click links or open attachments unless you can confirm the sender and know the content is safe.
>
>
>
> On 24/04/20 21:11, Alexander Graf wrote:
>> What I was saying above is that maybe code is easier to transfer that
>> than a .txt file that gets lost somewhere in the Documentation directory
>> :).
> whynotboth.jpg :D
:) Alright, I added it to the list, in addition to the sample we've been
talking before, with the basic flow of the ioctl interface usage.
>
>>>> To answer the question though, the target file is in a newly invented
>>>> file format called "EIF" and it needs to be loaded at offset 0x800000 of
>>>> the address space donated to the enclave.
>>> What is this EIF?
>> It's just a very dumb container format that has a trivial header, a
>> section with the bzImage and one to many sections of initramfs.
>>
>> As mentioned earlier in this thread, it really is just "-kernel" and
>> "-initrd", packed into a single binary for transmission to the host.
> Okay, got it. So, correct me if this is wrong, the information that is
> needed to boot the enclave is:
>
> * the kernel, in bzImage format
>
> * the initrd
>
> * a consecutive amount of memory, to be mapped with
> KVM_SET_USER_MEMORY_REGION
Yes, the kernel bzImage, the kernel command line, the ramdisk(s) are
part of the Enclave Image Format (EIF); plus an EIF header including
metadata such as magic number, eif version, image size and CRC.
>
> Off list, Alex and I discussed having a struct that points to kernel and
> initrd off enclave memory, and have the driver build EIF at the
> appropriate point in enclave memory (the 8 MiB ofset that you mentioned).
>
> This however has two disadvantages:
>
> 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?
>
> 2) it is less extensible (what if you want to use PVH in the future for
> example) and puts in the driver policy that should be in userspace.
>
>
> So why not just start running the enclave at 0xfffffff0 in real mode?
> Yes everybody hates it, but that's what OSes are written against. In
> the simplest example, the parent enclave can load bzImage and initrd at
> 0x10000 and place firmware tables (MPTable and DMI) somewhere at
> 0xf0000; the firmware would just be a few movs to segment registers
> followed by a long jmp.
>
> If you want to keep EIF, we measured in QEMU that there is no measurable
> difference between loading the kernel in the host and doing it in the
> guest, so Amazon could provide an EIF loader stub at 0xfffffff0 for
> backwards compatibility.
Thanks for info.
Andra
>
>>> Again, I cannot provide a sensible review without explaining how to use
>>> all this. I understand that Amazon needs to do part of the design
>>> behind closed doors, but this seems to have the resulted in issues that
>>> reminds me of Intel's SGX misadventures. If Amazon has designed NE in a
>>> way that is incompatible with open standards, it's up to Amazon to fix
>> Oh, if there's anything that conflicts with open standards here, I would
>> love to hear it immediately. I do not believe in security by obscurity :).
> That's great to hear!
>
> Paolo
>
Amazon Development Center (Romania) S.R.L. registered office: 27A Sf. Lazar Street, UBC5, floor 2, Iasi, Iasi County, 700045, Romania. Registered in Romania. Registration number J22/2621/2005.
next prev parent reply other threads:[~2020-04-27 9:16 UTC|newest]
Thread overview: 77+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-04-21 18:41 [PATCH v1 00/15] Add support for Nitro Enclaves Andra Paraschiv
2020-04-21 18:41 ` [PATCH v1 01/15] nitro_enclaves: Add ioctl interface definition Andra Paraschiv
2020-04-21 18:47 ` Randy Dunlap
2020-04-21 21:45 ` Paolo Bonzini
2020-04-22 15:49 ` Paraschiv, Andra-Irina
2020-04-21 18:41 ` [PATCH v1 02/15] nitro_enclaves: Define the PCI device interface Andra Paraschiv
2020-04-21 21:22 ` Paolo Bonzini
2020-04-23 13:37 ` Paraschiv, Andra-Irina
2020-04-24 15:10 ` Paraschiv, Andra-Irina
2020-04-21 18:41 ` [PATCH v1 03/15] nitro_enclaves: Define enclave info for internal bookkeeping Andra Paraschiv
2020-04-21 18:41 ` [PATCH v1 04/15] nitro_enclaves: Init PCI device driver Andra Paraschiv
2020-04-25 14:25 ` Liran Alon
2020-04-29 16:31 ` Paraschiv, Andra-Irina
2020-04-21 18:41 ` [PATCH v1 05/15] nitro_enclaves: Handle PCI device command requests Andra Paraschiv
2020-04-25 14:52 ` Liran Alon
2020-04-29 17:00 ` Paraschiv, Andra-Irina
2020-04-21 18:41 ` [PATCH v1 06/15] nitro_enclaves: Handle out-of-band PCI device events Andra Paraschiv
2020-04-21 18:41 ` [PATCH v1 07/15] nitro_enclaves: Init misc device providing the ioctl interface Andra Paraschiv
2020-04-21 18:41 ` [PATCH v1 08/15] nitro_enclaves: Add logic for enclave vm creation Andra Paraschiv
2020-04-21 18:41 ` [PATCH v1 09/15] nitro_enclaves: Add logic for enclave vcpu creation Andra Paraschiv
2020-04-21 18:41 ` [PATCH v1 10/15] nitro_enclaves: Add logic for enclave memory region set Andra Paraschiv
2020-04-21 18:41 ` [PATCH v1 11/15] nitro_enclaves: Add logic for enclave start Andra Paraschiv
2020-04-21 18:41 ` [PATCH v1 12/15] nitro_enclaves: Add logic for enclave termination Andra Paraschiv
2020-04-21 18:41 ` [PATCH v1 13/15] nitro_enclaves: Add Kconfig for the Nitro Enclaves driver Andra Paraschiv
2020-04-21 18:50 ` Randy Dunlap
2020-04-22 14:35 ` Paraschiv, Andra-Irina
2020-04-21 18:41 ` [PATCH v1 14/15] nitro_enclaves: Add Makefile " Andra Paraschiv
2020-04-23 8:12 ` kbuild test robot
2020-04-24 17:00 ` Paraschiv, Andra-Irina
2020-04-23 8:43 ` kbuild test robot
2020-04-24 15:27 ` Paraschiv, Andra-Irina
2020-04-21 18:41 ` [PATCH v1 15/15] MAINTAINERS: Add entry " Andra Paraschiv
2020-04-21 21:46 ` [PATCH v1 00/15] Add support for Nitro Enclaves Paolo Bonzini
2020-04-23 13:19 ` Paraschiv, Andra-Irina
2020-04-23 13:42 ` Paolo Bonzini
2020-04-23 17:42 ` Paraschiv, Andra-Irina
2020-04-23 17:51 ` Paolo Bonzini
2020-04-23 20:56 ` Alexander Graf
2020-04-23 21:18 ` Paolo Bonzini
2020-04-24 12:56 ` Alexander Graf
2020-04-24 16:27 ` Paolo Bonzini
2020-04-24 19:11 ` Alexander Graf
2020-04-25 16:05 ` Paolo Bonzini
2020-04-27 9:15 ` Paraschiv, Andra-Irina [this message]
2020-04-27 9:22 ` Paraschiv, Andra-Irina
2020-04-27 9:46 ` Paolo Bonzini
2020-04-27 10:00 ` Paraschiv, Andra-Irina
2020-04-28 15:07 ` Alexander Graf
2020-04-29 13:20 ` Paolo Bonzini
2020-04-30 13:59 ` Paraschiv, Andra-Irina
2020-04-30 10:34 ` Paolo Bonzini
2020-04-30 11:21 ` Alexander Graf
2020-04-30 11:38 ` Paolo Bonzini
2020-04-30 11:47 ` Alexander Graf
2020-04-30 11:58 ` Paolo Bonzini
2020-04-30 12:19 ` Alexander Graf
2020-05-07 17:44 ` Pavel Machek
2020-05-08 7:00 ` Paraschiv, Andra-Irina
2020-05-09 19:21 ` Pavel Machek
2020-05-10 11:02 ` Herrenschmidt, Benjamin
2020-05-11 10:49 ` Paraschiv, Andra-Irina
2020-05-11 13:49 ` Stefan Hajnoczi
2020-04-24 3:04 ` Longpeng (Mike, Cloud Infrastructure Service Product Dept.)
2020-04-24 8:19 ` Paraschiv, Andra-Irina
2020-04-24 9:54 ` Paraschiv, Andra-Irina
2020-04-26 1:55 ` Longpeng (Mike, Cloud Infrastructure Service Product Dept.)
2020-04-27 18:39 ` Paraschiv, Andra-Irina
2020-04-24 9:59 ` Tian, Kevin
2020-04-24 13:59 ` Paraschiv, Andra-Irina
2020-04-26 8:16 ` Tian, Kevin
2020-04-27 19:05 ` Paraschiv, Andra-Irina
[not found] ` <CAKXe6SLonLQLAOY9Q_2AzTeg4uJxiknsAWnJpTF0hMcXEG5Tew@mail.gmail.com>
2020-05-11 12:05 ` Paraschiv, Andra-Irina
2020-04-25 15:25 ` Liran Alon
2020-04-27 7:56 ` Paraschiv, Andra-Irina
2020-04-27 11:44 ` Liran Alon
2020-04-28 15:25 ` Alexander Graf
2020-04-28 16:01 ` Liran Alon
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