commit cb4ec47b5c73e04472984acf821e6be41b98064f
author johpow01 <john.powell@arm.com> Wed Aug 04 19:38:18 2021 -0500
committer John <john.powell@arm.com> Mon Sep 27 17:07:52 2021 +0200
tree 2489a386867098d385fdf263dc8cc1bcd2f98a4a
parent c7c22ab662008ca6cfb8b1926bbaa5fdc8eb399e

feat(hcx): add build option to enable FEAT_HCX

FEAT_HCX adds the extended hypervisor configuration register (HCRX_EL2)
and access to this register must be explicitly enabled through the
SCR_EL3.HXEn bit.  This patch adds a new build flag ENABLE_FEAT_HCX to
allow the register to be accessed from EL2.

Signed-off-by: John Powell <john.powell@arm.com>
Change-Id: Ibb36ad90622f1dc857adab4b0d4d7a89456a522b

make_helpers/defaults.mk

diff --git a/make_helpers/defaults.mk b/make_helpers/defaults.mk
index c188621..18092e7 100644
--- a/make_helpers/defaults.mk
+++ b/make_helpers/defaults.mk
@@ -121,6 +121,9 @@
 # Use BRANCH_PROTECTION to enable PAUTH.
 ENABLE_PAUTH			:= 0
 
+# Flag to enable access to the HCRX_EL2 register by setting SCR_EL3.HXEn.
+ENABLE_FEAT_HCX                 := 0
+
 # By default BL31 encryption disabled
 ENCRYPT_BL31			:= 0