From: James Bottomley <jejb@linux.ibm.com>

Add optional hook which calls a verifier with the content of the fw_cfg
command line.

Cc: Laszlo Ersek <lersek@redhat.com>
Cc: Ard Biesheuvel <ardb+tianocore@kernel.org>
Cc: Jordan Justen <jordan.l.justen@intel.com>
Cc: Ashish Kalra <ashish.kalra@amd.com>
Cc: Brijesh Singh <brijesh.singh@amd.com>
Cc: Erdem Aktas <erdemaktas@google.com>
Cc: James Bottomley <jejb@linux.ibm.com>
Cc: Jiewen Yao <jiewen.yao@intel.com>
Cc: Min Xu <min.m.xu@intel.com>
Cc: Tom Lendacky <thomas.lendacky@amd.com>
Signed-off-by: James Bottomley <jejb@linux.ibm.com>
---
 OvmfPkg/Library/GenericQemuLoadImageLib/GenericQemuLoadImageLib.c | 29 ++++++++++++++++++++
 1 file changed, 29 insertions(+)

diff --git a/OvmfPkg/Library/GenericQemuLoadImageLib/GenericQemuLoadImageLib.c b/OvmfPkg/Library/GenericQemuLoadImageLib/GenericQemuLoadImageLib.c
index 114db7e8441f..d3067dae1425 100644
--- a/OvmfPkg/Library/GenericQemuLoadImageLib/GenericQemuLoadImageLib.c
+++ b/OvmfPkg/Library/GenericQemuLoadImageLib/GenericQemuLoadImageLib.c
@@ -51,6 +51,28 @@ STATIC CONST KERNEL_VENMEDIA_FILE_DEVPATH mKernelDevicePath = {
   }
 };
 
+STATIC FW_CFG_VERIFIER mVerifier = NULL;
+
+/**
+  Register a verifier for the Firmware Configuration Filesystem to use
+
+  @param[in]  Verifier     The verifier to register
+
+  @retval EFI_SUCCESS      The verifier was successfully registered
+**/
+EFI_STATUS
+EFIAPI
+RegisterFwCfgVerifier (
+  IN FW_CFG_VERIFIER    Verifier
+  )
+{
+  if (mVerifier != NULL) {
+    return EFI_OUT_OF_RESOURCES;
+  }
+  mVerifier = Verifier;
+  return EFI_SUCCESS;
+}
+
 /**
   Download the kernel, the initial ramdisk, and the kernel command line from
   QEMU's fw_cfg. The kernel will be instructed via its command line to load
@@ -149,6 +171,13 @@ QemuLoadKernelImage (
       goto FreeCommandLine;
     }
 
+    if (mVerifier != NULL) {
+      Status = mVerifier (NULL, CommandLine, CommandLineSize);
+      if (EFI_ERROR (Status)) {
+        goto FreeCommandLine;
+      }
+    }
+
     //
     // Drop the terminating NUL, convert to UTF-16.
     //
-- 
2.25.1



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