[PATCH 17/17] OvmfPkg/Microvm: wire up serial console, drop super-io

["Gerd Hoffmann" <kraxel@redhat.com>]

Microvm has no LPC bridge, so drop the PciSioSerialDxe driver.
Use SerialDxe instead, with ioport hardcoded to 0x3f8 aka com1 aka ttyS0.

With this tianocore boots to uefi shell prompt on the serial console.
Direct kernel boot can be used too.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
---
 OvmfPkg/Microvm/MicrovmX64.dsc                | 11 +++--
 OvmfPkg/Microvm/MicrovmX64.fdf                |  4 +-
 .../PlatformBootManagerLib/BdsPlatform.c      | 40 +++++++++++++++++++
 3 files changed, 49 insertions(+), 6 deletions(-)

diff --git a/OvmfPkg/Microvm/MicrovmX64.dsc b/OvmfPkg/Microvm/MicrovmX64.dsc
index e32387c6c9c6..ab575db5bcfa 100644
--- a/OvmfPkg/Microvm/MicrovmX64.dsc
+++ b/OvmfPkg/Microvm/MicrovmX64.dsc
@@ -230,6 +230,8 @@ [LibraryClasses]
 [LibraryClasses.common]
   BaseCryptLib|CryptoPkg/Library/BaseCryptLib/BaseCryptLib.inf
   VmgExitLib|OvmfPkg/Library/VmgExitLib/VmgExitLib.inf
+  SerialPortLib|MdeModulePkg/Library/BaseSerialPortLib16550/BaseSerialPortLib16550.inf
+  PlatformHookLib|MdeModulePkg/Library/BasePlatformHookLibNull/BasePlatformHookLibNull.inf
 
 [LibraryClasses.common.SEC]
   QemuFwCfgLib|OvmfPkg/Library/QemuFwCfgLib/QemuFwCfgSecLib.inf
@@ -534,6 +536,11 @@ [PcdsFixedAtBuild]
   # Point to the MdeModulePkg/Application/UiApp/UiApp.inf
   gEfiMdeModulePkgTokenSpaceGuid.PcdBootManagerMenuFile|{ 0x21, 0xaa, 0x2c, 0x46, 0x14, 0x76, 0x03, 0x45, 0x83, 0x6e, 0x8a, 0xb6, 0xf4, 0x66, 0x23, 0x31 }
 
+  # microvm serial port^M
+  gEfiMdeModulePkgTokenSpaceGuid.PcdSerialUseMmio|FALSE
+  gEfiMdeModulePkgTokenSpaceGuid.PcdSerialPciDeviceInfo|{0xFF}
+  gEfiMdeModulePkgTokenSpaceGuid.PcdSerialRegisterBase|0x3f8
+
 ################################################################################
 #
 # Pcd Dynamic Section - list of all EDK II PCD Entries defined by this Platform
@@ -728,9 +735,7 @@ [Components]
   #
   # ISA Support
   #
-  OvmfPkg/SioBusDxe/SioBusDxe.inf
-  MdeModulePkg/Bus/Pci/PciSioSerialDxe/PciSioSerialDxe.inf
-  MdeModulePkg/Bus/Isa/Ps2KeyboardDxe/Ps2KeyboardDxe.inf
+  MdeModulePkg/Universal/SerialDxe/SerialDxe.inf
 
   #
   # SMBIOS Support
diff --git a/OvmfPkg/Microvm/MicrovmX64.fdf b/OvmfPkg/Microvm/MicrovmX64.fdf
index b4d56bd2d0e7..6314014f3de7 100644
--- a/OvmfPkg/Microvm/MicrovmX64.fdf
+++ b/OvmfPkg/Microvm/MicrovmX64.fdf
@@ -260,11 +260,9 @@ [FV.DXEFV]
 INF  MdeModulePkg/Universal/DisplayEngineDxe/DisplayEngineDxe.inf
 INF  MdeModulePkg/Universal/MemoryTest/NullMemoryTestDxe/NullMemoryTestDxe.inf
 
-INF  OvmfPkg/SioBusDxe/SioBusDxe.inf
 !if $(SOURCE_DEBUG_ENABLE) == FALSE
-INF  MdeModulePkg/Bus/Pci/PciSioSerialDxe/PciSioSerialDxe.inf
+INF  MdeModulePkg/Universal/SerialDxe/SerialDxe.inf
 !endif
-INF  MdeModulePkg/Bus/Isa/Ps2KeyboardDxe/Ps2KeyboardDxe.inf
 
 INF  MdeModulePkg/Universal/SmbiosDxe/SmbiosDxe.inf
 INF  OvmfPkg/SmbiosPlatformDxe/SmbiosPlatformDxe.inf
diff --git a/OvmfPkg/Library/PlatformBootManagerLib/BdsPlatform.c b/OvmfPkg/Library/PlatformBootManagerLib/BdsPlatform.c
index 618a96a8ba58..8933a5895229 100644
--- a/OvmfPkg/Library/PlatformBootManagerLib/BdsPlatform.c
+++ b/OvmfPkg/Library/PlatformBootManagerLib/BdsPlatform.c
@@ -8,6 +8,7 @@
 
 #include "BdsPlatform.h"
 #include <Guid/RootBridgesConnectedEventGroup.h>
+#include <Guid/SerialPortLibVendor.h>
 #include <Protocol/FirmwareVolume2.h>
 #include <Library/PlatformBmPrintScLib.h>
 #include <Library/Tcg2PhysicalPresenceLib.h>
@@ -661,6 +662,43 @@ PrepareLpcBridgeDevicePath (
   return EFI_SUCCESS;
 }
 
+typedef struct {
+  VENDOR_DEVICE_PATH        Guid;
+  EFI_DEVICE_PATH_PROTOCOL  End;
+} SERIAL_DEVICE_PATH;
+
+SERIAL_DEVICE_PATH serialDevicePath = {
+  {
+    { HARDWARE_DEVICE_PATH, HW_VENDOR_DP, { sizeof (VENDOR_DEVICE_PATH), 0} },
+    EDKII_SERIAL_PORT_LIB_VENDOR_GUID
+  },
+  { END_DEVICE_PATH_TYPE, END_ENTIRE_DEVICE_PATH_SUBTYPE, { sizeof (EFI_DEVICE_PATH_PROTOCOL), 0 } }
+};
+
+VOID
+PrepareMicrovmDevicePath (
+  VOID
+  )
+{
+  EFI_DEVICE_PATH_PROTOCOL  *DevicePath;
+  UINT16                    HostBridgeDevId;
+
+  HostBridgeDevId = PcdGet16 (PcdOvmfHostBridgePciDevId);
+  if (HostBridgeDevId != MICROVM_PSEUDO_DEVICE_ID) {
+    return;
+  }
+
+  DevicePath = (EFI_DEVICE_PATH_PROTOCOL*)&serialDevicePath;
+  DevicePath = AppendDevicePathNode (DevicePath,
+                 (EFI_DEVICE_PATH_PROTOCOL *)&gUartDeviceNode);
+  DevicePath = AppendDevicePathNode (DevicePath,
+                 (EFI_DEVICE_PATH_PROTOCOL *)&gTerminalTypeDeviceNode);
+
+  EfiBootManagerUpdateConsoleVariable (ConOut, DevicePath, NULL);
+  EfiBootManagerUpdateConsoleVariable (ConIn, DevicePath, NULL);
+  EfiBootManagerUpdateConsoleVariable (ErrOut, DevicePath, NULL);
+}
+
 EFI_STATUS
 GetGopDevicePath (
    IN  EFI_DEVICE_PATH_PROTOCOL *PciDevicePath,
@@ -1021,6 +1059,8 @@ PlatformInitializeConsole (
   //
   VisitAllPciInstances (DetectAndPreparePlatformPciDevicePath);
 
+  PrepareMicrovmDevicePath ();
+
   //
   // Have chance to connect the platform default console,
   // the platform default console is the minimum device group
-- 
2.31.1