[PATCH 2/2] OvmfPkg/OvmfPkgX64: Allow runtime control of IPv4 and IPv6 support

["Ard Biesheuvel" <ardb@kernel.org>]

Wire up the newly added DriverLoadInhibitorLib in a way that ties
dispatch of the Ip4Dxe and Ip6Dxe drivers to QEMU fw_cfg variables
'opt/org.tianocore/IPv4Support' and 'opt/org.tianocore/IPv6Support'
respectively.

Setting both variables to 'n' disables IP based networking entirely,
without the need for additional code changes at the NIC driver or
network boot protocol level.

Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
---
 OvmfPkg/OvmfPkgX64.dsc | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/OvmfPkg/OvmfPkgX64.dsc b/OvmfPkg/OvmfPkgX64.dsc
index 6e68f60dc90f..0c0ded88f86e 100644
--- a/OvmfPkg/OvmfPkgX64.dsc
+++ b/OvmfPkg/OvmfPkgX64.dsc
@@ -947,6 +947,20 @@ [Components]
       NULL|OvmfPkg/Library/PxeBcPcdProducerLib/PxeBcPcdProducerLib.inf
   }
 
+  NetworkPkg/Ip4Dxe/Ip4Dxe.inf {
+    <LibraryClasses>
+      NULL|OvmfPkg/Library/DriverLoadInhibitorLib/DriverLoadInhibitorLib.inf
+    <PcdsFixedAtBuild>
+      gUefiOvmfPkgTokenSpaceGuid.PcdDriverInhibitorFwCfgVarName|"opt/org.tianocore/IPv4Support"
+  }
+
+  NetworkPkg/Ip6Dxe/Ip6Dxe.inf {
+    <LibraryClasses>
+      NULL|OvmfPkg/Library/DriverLoadInhibitorLib/DriverLoadInhibitorLib.inf
+    <PcdsFixedAtBuild>
+      gUefiOvmfPkgTokenSpaceGuid.PcdDriverInhibitorFwCfgVarName|"opt/org.tianocore/IPv6Support"
+  }
+
 !if $(NETWORK_TLS_ENABLE) == TRUE
   NetworkPkg/TlsAuthConfigDxe/TlsAuthConfigDxe.inf {
     <LibraryClasses>
-- 
2.35.1