[PATCH] [B-C-D/master][SRU] efi/arm/arm64: Allow SetVirtualAddressMap() to be omitted

[Paolo Pisati]

BugLink: https://bugs.launchpad.net/bugs/1814982

[Impact]

The Ubuntu kernel is not currently bootable on various arm64 laptops
(HP Envy x2, Asus NovaGo, Lenovo Miix 630, Lenovo Yoga C630, Samsung ...)
because of EFI memory permissions/restrictions. The reason is explained in the
commit supplied below.

[Test Case]

Install and boot Ubuntu on one of the above arm64 laptops.

[Fix]

Committed upstream:
https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git/commit/?id=4e46c2a956215482418d7b315749fb1b6c6bc224

[Regression Risk]

This commit adds support for an optional kernel command line
parameter, off by default.

Clean cherry-pick, the patch is queued for 5.1 and the reporter has tested it
(and reported to be working) on one of the above arm64 laptop.

Ard Biesheuvel (1):
  efi/arm/arm64: Allow SetVirtualAddressMap() to be omitted

 drivers/firmware/efi/libstub/arm-stub.c        |  5 +++++
 drivers/firmware/efi/libstub/efi-stub-helper.c | 10 ++++++++++
 drivers/firmware/efi/libstub/efistub.h         |  1 +
 drivers/firmware/efi/libstub/fdt.c             |  3 +++
 4 files changed, 19 insertions(+)

-- 
2.7.4