OvmfPkg: disable PcdHiiOsRuntimeSupport

Edk2 commit 8a45f80edad4 ("MdeModulePkg: Make HII configuration settings
available to OS runtime") implements the optional UEFI feature described
in "31.2.11.1 OS Runtime Utilization" in UEFI v2.6.

While this feature might show benefits down the road even in QEMU virtual
machines, at the moment it only presents drawbacks:
- it increases the EfiRuntimeServicesData footprint,
- it triggers HII compatibility problems between edk2 and external drivers
  unconditionally, even if the end-user is not interested in HII and/or in
  configuring said drivers (see
  <https://www.redhat.com/archives/vfio-users/2016-March/msg00153.html>
  and <http://thread.gmane.org/gmane.comp.bios.edk2.devel/9894> for an
  example).

While the feature was being introduced, popular demand for a controlling
Feature PCD rose (see
<http://thread.gmane.org/gmane.comp.bios.edk2.devel/7626>), which is why
we can set it now to FALSE.

Cc: Jordan Justen <jordan.l.justen@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Laszlo Ersek <lersek@redhat.com>
Reviewed-by: Jordan Justen <jordan.l.justen@intel.com>

diff --git a/OvmfPkg/OvmfPkgIa32.dsc b/OvmfPkg/OvmfPkgIa32.dsc
index 19146f2bbba3f30e948ae24142edff136cfd8efd..d296d932f92ee77755f53a572f7e104896eaa366 100644 (file)
--- a/OvmfPkg/OvmfPkgIa32.dsc
+++ b/OvmfPkg/OvmfPkgIa32.dsc
@@ -358,6 +358,7 @@
 #\r
 ################################################################################\r
 [PcdsFeatureFlag]\r
+  gEfiMdeModulePkgTokenSpaceGuid.PcdHiiOsRuntimeSupport|FALSE\r
   gEfiMdeModulePkgTokenSpaceGuid.PcdStatusCodeUseSerial|FALSE\r
   gEfiMdeModulePkgTokenSpaceGuid.PcdStatusCodeUseMemory|TRUE\r
   gEfiMdeModulePkgTokenSpaceGuid.PcdDxeIplSupportUefiDecompress|FALSE\r

diff --git a/OvmfPkg/OvmfPkgIa32X64.dsc b/OvmfPkg/OvmfPkgIa32X64.dsc
index e8b3ee3a11123f76dea816e4ff4c4216c9d8bd04..8489b77e887d607ed59ee4834cff8b99d9789b1a 100644 (file)
--- a/OvmfPkg/OvmfPkgIa32X64.dsc
+++ b/OvmfPkg/OvmfPkgIa32X64.dsc
@@ -363,6 +363,7 @@
 #\r
 ################################################################################\r
 [PcdsFeatureFlag]\r
+  gEfiMdeModulePkgTokenSpaceGuid.PcdHiiOsRuntimeSupport|FALSE\r
   gEfiMdeModulePkgTokenSpaceGuid.PcdStatusCodeUseSerial|FALSE\r
   gEfiMdeModulePkgTokenSpaceGuid.PcdStatusCodeUseMemory|TRUE\r
   gEfiMdeModulePkgTokenSpaceGuid.PcdDxeIplSupportUefiDecompress|FALSE\r

diff --git a/OvmfPkg/OvmfPkgX64.dsc b/OvmfPkg/OvmfPkgX64.dsc
index 18a467795e53cb082e6ea905f1cfb25620285c35..24fa073542d3eb08d9eb7c8c3b6b92cc2cb9aa6c 100644 (file)
--- a/OvmfPkg/OvmfPkgX64.dsc
+++ b/OvmfPkg/OvmfPkgX64.dsc
@@ -363,6 +363,7 @@
 #\r
 ################################################################################\r
 [PcdsFeatureFlag]\r
+  gEfiMdeModulePkgTokenSpaceGuid.PcdHiiOsRuntimeSupport|FALSE\r
   gEfiMdeModulePkgTokenSpaceGuid.PcdStatusCodeUseSerial|FALSE\r
   gEfiMdeModulePkgTokenSpaceGuid.PcdStatusCodeUseMemory|TRUE\r
   gEfiMdeModulePkgTokenSpaceGuid.PcdDxeIplSupportUefiDecompress|FALSE\r