Introduce NetworkCfgLib which will set PcdNetworkSupport based on
"etc/networking" qemu file.
If "etc/networking" (type bool) is TRUE, then PcdNetworkSupport will be
TRUE and vice versa.
In the following patch, PcdNetworkSupport will be used to enable/disable
VirtIo net driver so that VMM will have control over networking
functionality in runtime.
The default value of PcdNetworkSupport is TRUE, which means if network
support is turned on at compile time and VMM doesn't do anything, the
VirtIo driver will be enabled. This is to make it consistent with the
behavior before this patch.
Cc: Ard Biesheuvel <ardb+tianoc...@kernel.org>
Cc: Jordan Justen <jordan.l.jus...@intel.com>
Cc: Laszlo Ersek <ler...@redhat.com>
Cc: Anthony Perard <anthony.per...@citrix.com>
Cc: Julien Grall <jul...@xen.org>
Signed-off-by: Yuan Yu <yua...@google.com>
---
OvmfPkg/OvmfPkg.dec | 3 ++
OvmfPkg/Library/NetworkCfgLib/NetworkCfgLib.inf | 29 ++++++++++++++++++
OvmfPkg/Library/NetworkCfgLib/NetworkCfgLib.c | 32 ++++++++++++++++++++
3 files changed, 64 insertions(+)
diff --git a/OvmfPkg/OvmfPkg.dec b/OvmfPkg/OvmfPkg.dec
index 5af76a540529..5dced0568f6c 100644
--- a/OvmfPkg/OvmfPkg.dec
+++ b/OvmfPkg/OvmfPkg.dec
@@ -451,6 +451,9 @@ [PcdsDynamic, PcdsDynamicEx]
## This PCD records LASA field in CC EVENTLOG ACPI table.
gUefiOvmfPkgTokenSpaceGuid.PcdCcEventlogAcpiTableLasa|0|UINT64|0x67
+ ## This PCD controls if network support should be turned on at runtime.
+ gUefiOvmfPkgTokenSpaceGuid.PcdNetworkSupport|TRUE|BOOLEAN|0x72
+
[PcdsFeatureFlag]
gUefiOvmfPkgTokenSpaceGuid.PcdQemuBootOrderPciTranslation|TRUE|BOOLEAN|0x1c
gUefiOvmfPkgTokenSpaceGuid.PcdQemuBootOrderMmioTranslation|FALSE|BOOLEAN|0x1d
diff --git a/OvmfPkg/Library/NetworkCfgLib/NetworkCfgLib.inf
b/OvmfPkg/Library/NetworkCfgLib/NetworkCfgLib.inf
new file mode 100644
index 000000000000..44be171ccc7a
--- /dev/null
+++ b/OvmfPkg/Library/NetworkCfgLib/NetworkCfgLib.inf
@@ -0,0 +1,29 @@
+## @file
+# Configure some PCDs dynamically
+#
+# SPDX-License-Identifier: BSD-2-Clause-Patent
+##
+
+[Defines]
+ INF_VERSION = 1.27
+ BASE_NAME = NetworkCfgLib
+ FILE_GUID = c81bfcf9-7dce-44f7-a9cb-be607f481a86
+ MODULE_TYPE = BASE
+ VERSION_STRING = 1.0
+ LIBRARY_CLASS = NULL
+ CONSTRUCTOR = SetNetworkingSupportPcds
+
+[Sources]
+ NetworkCfgLib.c
+
+[Packages]
+ MdePkg/MdePkg.dec
+ OvmfPkg/OvmfPkg.dec
+
+[LibraryClasses]
+ PcdLib
+ DebugLib
+ QemuFwCfgSimpleParserLib
+
+[Pcd]
+ gUefiOvmfPkgTokenSpaceGuid.PcdNetworkSupport ## SOMETIMES_PRODUCES
diff --git a/OvmfPkg/Library/NetworkCfgLib/NetworkCfgLib.c
b/OvmfPkg/Library/NetworkCfgLib/NetworkCfgLib.c
new file mode 100644
index 000000000000..e77198dbd4e4
--- /dev/null
+++ b/OvmfPkg/Library/NetworkCfgLib/NetworkCfgLib.c
@@ -0,0 +1,32 @@
+#include <Library/PcdLib.h>
+#include <Library/DebugLib.h>
+#include <Library/QemuFwCfgSimpleParserLib.h>
+
+RETURN_STATUS
+EFIAPI
+SetNetworkingSupportPcds (
+ VOID
+ )
+{
+ BOOLEAN FwCfgBool;
+ RETURN_STATUS Status;
+
+ DEBUG ((DEBUG_INFO, "[network] %a\n", __FUNCTION__));
+
+ Status = QemuFwCfgParseBool ("etc/networking", &FwCfgBool);
+ if (RETURN_ERROR (Status)) {
+ DEBUG ((DEBUG_INFO,
+ "[network] QemuFwCfgParseBool('etc/networking') failed, will return
"
+ "SUCCESS and continue without overriding PcdNetworkSupport.\n"));
+ return RETURN_SUCCESS;
+ }
+ DEBUG ((DEBUG_INFO, "[network] etc/networking = %d\n", FwCfgBool));
+
+ Status = PcdSetBoolS (PcdNetworkSupport, FwCfgBool);
+ if (RETURN_ERROR (Status)) {
+ return Status;
+ }
+ DEBUG ((DEBUG_INFO, "[network] PcdNetworkSupport was set to %d\n",
FwCfgBool));
+
+ return RETURN_SUCCESS;
+}
--
2.37.1.559.g78731f0fdb-goog
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