OvmfPkg: Allow runtime control of IPv4 and IPv6 support on QEMU

Wire up the newly added UefiDriverEntrypoint 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>
Acked-by: Gerd Hoffmann <kraxel@redhat.com>

diff --git a/OvmfPkg/NetworkComponents.dsc.inc b/OvmfPkg/NetworkComponents.dsc.inc
index 85a165391655ae2a49d53ffabfdfc9dd8a5093c1..713eec7dd1ce7a5633671e07f6ebc174c00f1265 100644 (file)
--- a/OvmfPkg/NetworkComponents.dsc.inc
+++ b/OvmfPkg/NetworkComponents.dsc.inc
@@ -14,4 +14,22 @@
         NULL|OvmfPkg/Library/TlsAuthConfigLib/TlsAuthConfigLib.inf\r
     }\r
   !endif\r
+\r
+  !if $(NETWORK_IP4_ENABLE) == TRUE\r
+    NetworkPkg/Ip4Dxe/Ip4Dxe.inf {\r
+      <LibraryClasses>\r
+        UefiDriverEntryPoint|OvmfPkg/Library/UefiDriverEntryPointFwCfgOverrideLib/UefiDriverEntryPointFwCfgOverrideLib.inf\r
+      <PcdsFixedAtBuild>\r
+        gUefiOvmfPkgTokenSpaceGuid.PcdEntryPointOverrideFwCfgVarName|"opt/org.tianocore/IPv4Support"\r
+    }\r
+  !endif\r
+\r
+  !if $(NETWORK_IP6_ENABLE) == TRUE\r
+    NetworkPkg/Ip6Dxe/Ip6Dxe.inf {\r
+      <LibraryClasses>\r
+        UefiDriverEntryPoint|OvmfPkg/Library/UefiDriverEntryPointFwCfgOverrideLib/UefiDriverEntryPointFwCfgOverrideLib.inf\r
+      <PcdsFixedAtBuild>\r
+        gUefiOvmfPkgTokenSpaceGuid.PcdEntryPointOverrideFwCfgVarName|"opt/org.tianocore/IPv6Support"\r
+    }\r
+  !endif\r
 !endif\r