https://lists.ubuntu.com/archives/kernel-team/2020-November/114666.html

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https://bugs.launchpad.net/bugs/1903087

Title:
  AWS: add the nitro_enclaves driver

Status in linux-aws package in Ubuntu:
  In Progress
Status in linux-aws source package in Focal:
  In Progress
Status in linux-aws source package in Groovy:
  In Progress
Status in linux-aws source package in Hirsute:
  In Progress

Bug description:
  Add the nitro_enclaves driver from mainline to linux-
  aws/{focal,bionic-5.4} and linux-aws/{groovy,hirsute}.  The driver is
  supplied by the following mainline commits, which are all clean cherry
  picks for groovy with a couple of trivial backports for focal:

  e82ed736ad2d MAINTAINERS: Add entry for the Nitro Enclaves driver
  bf15d79ce142 nitro_enclaves: Add overview documentation
  acc4229c3990 nitro_enclaves: Add sample for ioctl interface usage
  0f5c7b748439 nitro_enclaves: Add Makefile for the Nitro Enclaves driver
  07499cc661a9 nitro_enclaves: Add Kconfig for the Nitro Enclaves driver
  9c8eb50fe9e2 nitro_enclaves: Add logic for terminating an enclave
  111c775a5f0d nitro_enclaves: Add logic for starting an enclave
  7dc9d4309fdb nitro_enclaves: Add logic for setting an enclave memory region
  988b7a471726 nitro_enclaves: Add logic for getting the enclave image load info
  ff8a4d3e3a99 nitro_enclaves: Add logic for setting an enclave vCPU
  38907e124088 nitro_enclaves: Add logic for creating an enclave VM
  bd47c995c0e4 nitro_enclaves: Init misc device providing the ioctl interface
  e5d616d8bb50 nitro_enclaves: Handle out-of-band PCI device events
  ad2b6980d0d3 nitro_enclaves: Handle PCI device command requests
  89308c11ae3b nitro_enclaves: Init PCI device driver
  1df624892c1e nitro_enclaves: Define enclave info for internal bookkeeping
  0a44561768c5 nitro_enclaves: Define the PCI device interface
  15b760c37ad3 nitro_enclaves: Add ioctl interface definition

  linux-aws/focal also needs this prereq:

  93ef1429e556 cpu/hotplug: Add new {add,remove}_cpu() functions

  
  [Impact]

   * Supplies driver needed to support AWS feature.

  [Test Case]

   * T.B.D. (to be validated by AWS).

  [Regression Potential]

   * Low: Just adds a new driver module which won't load by default.

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