From a26a08dc1fc8f2539d6eb20d808646ff46715908 Mon Sep 17 00:00:00 2001
From: James Bottomley <jejb@linux.ibm.com>
Date: Fri, 15 Jan 2021 15:33:02 -0800
Subject: [PATCH] OvmfPkg: PlatformBootManagerLibGrub: Allow executing kernel
 via fw_cfg

Support QEMU's -kernel option.

Create a QemuKernel.c for PlatformBootManagerLibGrub
which is an exact copy of the file
PlatformBootManagerLib/QemuKernel.c .

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>
Ref: https://bugzilla.tianocore.org/show_bug.cgi?id=3457
Signed-off-by: James Bottomley <jejb@linux.ibm.com>
Reviewed-by: Brijesh Singh <brijesh.singh@amd.com>
Reviewed-by: Jiewen Yao <jiewen.yao@intel.com>
---
 OvmfPkg/AmdSev/AmdSevX64.dsc                  |  1 +
 .../PlatformBootManagerLibGrub/BdsPlatform.c  |  5 ++
 .../PlatformBootManagerLibGrub/BdsPlatform.h  | 11 ++++
 .../PlatformBootManagerLibGrub.inf            |  2 +
 .../PlatformBootManagerLibGrub/QemuKernel.c   | 50 +++++++++++++++++++
 5 files changed, 69 insertions(+)
 create mode 100644 OvmfPkg/Library/PlatformBootManagerLibGrub/QemuKernel.c

diff --git a/OvmfPkg/AmdSev/AmdSevX64.dsc b/OvmfPkg/AmdSev/AmdSevX64.dsc
index a2f1324c40..aefdcf881c 100644
--- a/OvmfPkg/AmdSev/AmdSevX64.dsc
+++ b/OvmfPkg/AmdSev/AmdSevX64.dsc
@@ -281,6 +281,7 @@
   CpuExceptionHandlerLib|UefiCpuPkg/Library/CpuExceptionHandlerLib/PeiCpuExceptionHandlerLib.inf
   MpInitLib|UefiCpuPkg/Library/MpInitLib/PeiMpInitLib.inf
   QemuFwCfgS3Lib|OvmfPkg/Library/QemuFwCfgS3Lib/PeiQemuFwCfgS3LibFwCfg.inf
+  QemuLoadImageLib|OvmfPkg/Library/GenericQemuLoadImageLib/GenericQemuLoadImageLib.inf
   PcdLib|MdePkg/Library/PeiPcdLib/PeiPcdLib.inf
   QemuFwCfgLib|OvmfPkg/Library/QemuFwCfgLib/QemuFwCfgPeiLib.inf
 
diff --git a/OvmfPkg/Library/PlatformBootManagerLibGrub/BdsPlatform.c b/OvmfPkg/Library/PlatformBootManagerLibGrub/BdsPlatform.c
index 5c92d4fc2b..7cceeea487 100644
--- a/OvmfPkg/Library/PlatformBootManagerLibGrub/BdsPlatform.c
+++ b/OvmfPkg/Library/PlatformBootManagerLibGrub/BdsPlatform.c
@@ -1315,6 +1315,11 @@ PlatformBootManagerAfterConsole (
   //
   Tcg2PhysicalPresenceLibProcessRequest (NULL);
 
+  //
+  // Process QEMU's -kernel command line option
+  //
+  TryRunningQemuKernel ();
+
   //
   // Perform some platform specific connect sequence
   //
diff --git a/OvmfPkg/Library/PlatformBootManagerLibGrub/BdsPlatform.h b/OvmfPkg/Library/PlatformBootManagerLibGrub/BdsPlatform.h
index 748c630819..f1d3a2906c 100644
--- a/OvmfPkg/Library/PlatformBootManagerLibGrub/BdsPlatform.h
+++ b/OvmfPkg/Library/PlatformBootManagerLibGrub/BdsPlatform.h
@@ -172,4 +172,15 @@ PlatformInitializeConsole (
   IN PLATFORM_CONSOLE_CONNECT_ENTRY   *PlatformConsole
   );
 
+/**
+  Loads and boots UEFI Linux via the FwCfg interface.
+
+  @retval    EFI_NOT_FOUND - The Linux kernel was not found
+
+**/
+EFI_STATUS
+TryRunningQemuKernel (
+  VOID
+  );
+
 #endif // _PLATFORM_SPECIFIC_BDS_PLATFORM_H_
diff --git a/OvmfPkg/Library/PlatformBootManagerLibGrub/PlatformBootManagerLibGrub.inf b/OvmfPkg/Library/PlatformBootManagerLibGrub/PlatformBootManagerLibGrub.inf
index 9a806d17ec..5f6f73d184 100644
--- a/OvmfPkg/Library/PlatformBootManagerLibGrub/PlatformBootManagerLibGrub.inf
+++ b/OvmfPkg/Library/PlatformBootManagerLibGrub/PlatformBootManagerLibGrub.inf
@@ -23,6 +23,7 @@
 
 [Sources]
   BdsPlatform.c
+  QemuKernel.c
   PlatformData.c
   BdsPlatform.h
 
@@ -46,6 +47,7 @@
   BootLogoLib
   DevicePathLib
   PciLib
+  QemuLoadImageLib
   UefiLib
   PlatformBmPrintScLib
   Tcg2PhysicalPresenceLib
diff --git a/OvmfPkg/Library/PlatformBootManagerLibGrub/QemuKernel.c b/OvmfPkg/Library/PlatformBootManagerLibGrub/QemuKernel.c
new file mode 100644
index 0000000000..c625592177
--- /dev/null
+++ b/OvmfPkg/Library/PlatformBootManagerLibGrub/QemuKernel.c
@@ -0,0 +1,50 @@
+/** @file
+
+  Copyright (c) 2006 - 2015, Intel Corporation. All rights reserved.<BR>
+  SPDX-License-Identifier: BSD-2-Clause-Patent
+
+**/
+
+#include <Uefi.h>
+
+#include <Library/BaseLib.h>
+#include <Library/DebugLib.h>
+#include <Library/QemuLoadImageLib.h>
+#include <Library/ReportStatusCodeLib.h>
+#include <Library/UefiLib.h>
+
+
+EFI_STATUS
+TryRunningQemuKernel (
+  VOID
+  )
+{
+  EFI_STATUS                Status;
+  EFI_HANDLE                KernelImageHandle;
+
+  Status = QemuLoadKernelImage (&KernelImageHandle);
+  if (EFI_ERROR (Status)) {
+    return Status;
+  }
+
+  //
+  // Signal the EVT_SIGNAL_READY_TO_BOOT event
+  //
+  EfiSignalEventReadyToBoot();
+
+  REPORT_STATUS_CODE (EFI_PROGRESS_CODE,
+    (EFI_SOFTWARE_DXE_BS_DRIVER | EFI_SW_DXE_BS_PC_READY_TO_BOOT_EVENT));
+
+  //
+  // Start the image.
+  //
+  Status = QemuStartKernelImage (&KernelImageHandle);
+  if (EFI_ERROR (Status)) {
+    DEBUG ((DEBUG_ERROR, "%a: QemuStartKernelImage(): %r\n", __FUNCTION__,
+      Status));
+  }
+
+  QemuUnloadKernelImage (KernelImageHandle);
+
+  return Status;
+}
-- 
2.39.2