[Xen-devel] [PATCH v2 28/31] OvmfPkg/PlatformBootManagerLib: Use a Xen console for ConOut/ConIn

[Anthony PERARD <anthony.perard@xxxxxxxxxx>]

On a Xen PVH guest, none of the existing serial or console interface
works, so we add a new one, based on XenConsoleSerialPortLib, and
implemeted via SerialDxe.

That a simple console implementation that can works on both PVH guest
and HVM guests, even if it rarely going to be use on HVM.

Have PlatformBootManagerLib look for the new console, when running as a
Xen guest.

Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Anthony PERARD <anthony.perard@xxxxxxxxxx>
---

Notes:
    v2:
    - Use MdeModulePkg/Universal/SerialDxe instead of something new.
    - Have PlatformInitializeConsole() look for it by using the
      known-in-advance device path for the xen console in the
      PLATFORM_CONSOLE_CONNECT_ENTRY.

 OvmfPkg/XenOvmf.dsc                                               |  4 ++
 OvmfPkg/XenOvmf.fdf                                               |  1 +
 OvmfPkg/Library/PlatformBootManagerLib/PlatformBootManagerLib.inf |  4 ++
 OvmfPkg/Library/PlatformBootManagerLib/BdsPlatform.h              |  1 +
 OvmfPkg/Library/PlatformBootManagerLib/BdsPlatform.c              | 10 +++-
 OvmfPkg/Library/PlatformBootManagerLib/PlatformData.c             | 59 
++++++++++++++++++++
 6 files changed, 78 insertions(+), 1 deletion(-)

diff --git a/OvmfPkg/XenOvmf.dsc b/OvmfPkg/XenOvmf.dsc
index 35af05715b..a26f611058 100644
--- a/OvmfPkg/XenOvmf.dsc
+++ b/OvmfPkg/XenOvmf.dsc
@@ -599,6 +599,10 @@ [Components]
   OvmfPkg/XenIoPciDxe/XenIoPciDxe.inf
   OvmfPkg/XenBusDxe/XenBusDxe.inf
   OvmfPkg/XenPvBlkDxe/XenPvBlkDxe.inf
+  MdeModulePkg/Universal/SerialDxe/SerialDxe.inf {
+    <LibraryClasses>
+      
SerialPortLib|OvmfPkg/Library/XenConsoleSerialPortLib/XenConsoleSerialPortLib.inf
+  }
   MdeModulePkg/Universal/WatchdogTimerDxe/WatchdogTimer.inf
   
MdeModulePkg/Universal/MonotonicCounterRuntimeDxe/MonotonicCounterRuntimeDxe.inf
   MdeModulePkg/Universal/CapsuleRuntimeDxe/CapsuleRuntimeDxe.inf
diff --git a/OvmfPkg/XenOvmf.fdf b/OvmfPkg/XenOvmf.fdf
index d614bdce1d..e078c7b405 100644
--- a/OvmfPkg/XenOvmf.fdf
+++ b/OvmfPkg/XenOvmf.fdf
@@ -298,6 +298,7 @@ [FV.DXEFV]
 INF  OvmfPkg/XenIoPciDxe/XenIoPciDxe.inf
 INF  OvmfPkg/XenBusDxe/XenBusDxe.inf
 INF  OvmfPkg/XenPvBlkDxe/XenPvBlkDxe.inf
+INF  MdeModulePkg/Universal/SerialDxe/SerialDxe.inf
 
 INF  MdeModulePkg/Universal/WatchdogTimerDxe/WatchdogTimer.inf
 INF  
MdeModulePkg/Universal/MonotonicCounterRuntimeDxe/MonotonicCounterRuntimeDxe.inf
diff --git a/OvmfPkg/Library/PlatformBootManagerLib/PlatformBootManagerLib.inf 
b/OvmfPkg/Library/PlatformBootManagerLib/PlatformBootManagerLib.inf
index c41aaeef3f..7dd0683cd2 100644
--- a/OvmfPkg/Library/PlatformBootManagerLib/PlatformBootManagerLib.inf
+++ b/OvmfPkg/Library/PlatformBootManagerLib/PlatformBootManagerLib.inf
@@ -67,6 +67,10 @@ [Pcd]
   gUefiOvmfPkgTokenSpaceGuid.PcdOvmfHostBridgePciDevId
   gEfiMdePkgTokenSpaceGuid.PcdPlatformBootTimeOut
   gEfiIntelFrameworkModulePkgTokenSpaceGuid.PcdShellFile
+  gEfiMdePkgTokenSpaceGuid.PcdUartDefaultBaudRate         ## CONSUMES
+  gEfiMdePkgTokenSpaceGuid.PcdUartDefaultDataBits         ## CONSUMES
+  gEfiMdePkgTokenSpaceGuid.PcdUartDefaultParity           ## CONSUMES
+  gEfiMdePkgTokenSpaceGuid.PcdUartDefaultStopBits         ## CONSUMES
 
 [Pcd.IA32, Pcd.X64]
   gEfiMdePkgTokenSpaceGuid.PcdFSBClock
diff --git a/OvmfPkg/Library/PlatformBootManagerLib/BdsPlatform.h 
b/OvmfPkg/Library/PlatformBootManagerLib/BdsPlatform.h
index 4948ca6518..2ab1a76f6a 100644
--- a/OvmfPkg/Library/PlatformBootManagerLib/BdsPlatform.h
+++ b/OvmfPkg/Library/PlatformBootManagerLib/BdsPlatform.h
@@ -172,6 +172,7 @@ typedef struct {
 #define CONSOLE_IN  BIT1
 #define STD_ERROR   BIT2
 extern PLATFORM_CONSOLE_CONNECT_ENTRY  gPlatformConsole[];
+extern PLATFORM_CONSOLE_CONNECT_ENTRY  gXenPlatformConsole[];
 
 //
 // Platform BDS Functions
diff --git a/OvmfPkg/Library/PlatformBootManagerLib/BdsPlatform.c 
b/OvmfPkg/Library/PlatformBootManagerLib/BdsPlatform.c
index 1a6d47732e..f186060f34 100644
--- a/OvmfPkg/Library/PlatformBootManagerLib/BdsPlatform.c
+++ b/OvmfPkg/Library/PlatformBootManagerLib/BdsPlatform.c
@@ -85,6 +85,13 @@ InstallDevicePathCallback (
   VOID
   );
 
+STATIC
+BOOLEAN
+XenDetected (
+  VOID
+  );
+
+
 VOID
 PlatformRegisterFvBootOption (
   EFI_GUID                         *FileGuid,
@@ -404,7 +411,8 @@ PlatformBootManagerBeforeConsole (
   //
   EfiBootManagerDispatchDeferredImages ();
 
-  PlatformInitializeConsole (gPlatformConsole);
+  PlatformInitializeConsole (
+    XenDetected() ? gXenPlatformConsole : gPlatformConsole);
   PcdStatus = PcdSet16S (PcdPlatformBootTimeOut,
                 GetFrontPageTimeoutFromQemu ());
   ASSERT_RETURN_ERROR (PcdStatus);
diff --git a/OvmfPkg/Library/PlatformBootManagerLib/PlatformData.c 
b/OvmfPkg/Library/PlatformBootManagerLib/PlatformData.c
index 1250a6d351..4179370c81 100644
--- a/OvmfPkg/Library/PlatformBootManagerLib/PlatformData.c
+++ b/OvmfPkg/Library/PlatformBootManagerLib/PlatformData.c
@@ -16,6 +16,11 @@
 #include "BdsPlatform.h"
 #include <Guid/QemuRamfb.h>
 
+#define SERIAL_DXE_FILE_GUID { \
+          0xD3987D4B, 0x971A, 0x435F, \
+          { 0x8C, 0xAF, 0x49, 0x67, 0xEB, 0x62, 0x72, 0x41 } \
+          }
+
 //
 // Debug Agent UART Device Path structure
 //
@@ -49,6 +54,18 @@ typedef struct {
 } VENDOR_RAMFB_DEVICE_PATH;
 #pragma pack ()
 
+//
+// Xen Console Device Path structure
+//
+#pragma pack(1)
+typedef struct {
+  VENDOR_DEVICE_PATH        VendorHardware;
+  UART_DEVICE_PATH          Uart;
+  VENDOR_DEVICE_PATH        TerminalType;
+  EFI_DEVICE_PATH_PROTOCOL  End;
+} XEN_CONSOLE_DEVICE_PATH;
+#pragma pack()
+
 ACPI_HID_DEVICE_PATH       gPnpPs2KeyboardDeviceNode  = gPnpPs2Keyboard;
 ACPI_HID_DEVICE_PATH       gPnp16550ComPortDeviceNode = gPnp16550ComPort;
 UART_DEVICE_PATH           gUartDeviceNode            = gUart;
@@ -147,6 +164,37 @@ STATIC VENDOR_RAMFB_DEVICE_PATH gQemuRamfbDevicePath = {
   gEndEntire
 };
 
+STATIC XEN_CONSOLE_DEVICE_PATH gXenConsoleDevicePath = {
+  {
+    {
+      HARDWARE_DEVICE_PATH,
+      HW_VENDOR_DP,
+      {
+        (UINT8) (sizeof (VENDOR_DEVICE_PATH)),
+        (UINT8) ((sizeof (VENDOR_DEVICE_PATH)) >> 8)
+      }
+    },
+    SERIAL_DXE_FILE_GUID
+  },
+  {
+    {
+      MESSAGING_DEVICE_PATH,
+      MSG_UART_DP,
+      {
+        (UINT8) (sizeof (UART_DEVICE_PATH)),
+        (UINT8) ((sizeof (UART_DEVICE_PATH)) >> 8)
+      }
+    },
+    0,
+    FixedPcdGet64 (PcdUartDefaultBaudRate),
+    FixedPcdGet8 (PcdUartDefaultDataBits),
+    FixedPcdGet8 (PcdUartDefaultParity),
+    FixedPcdGet8 (PcdUartDefaultStopBits),
+  },
+  gPcAnsiTerminal,
+  gEndEntire
+};
+
 //
 // Predefined platform default console device path
 //
@@ -169,6 +217,17 @@ PLATFORM_CONSOLE_CONNECT_ENTRY   gPlatformConsole[] = {
   }
 };
 
+PLATFORM_CONSOLE_CONNECT_ENTRY   gXenPlatformConsole[] = {
+  {
+    (EFI_DEVICE_PATH_PROTOCOL *)&gXenConsoleDevicePath,
+    (CONSOLE_OUT | CONSOLE_IN | STD_ERROR)
+  },
+  {
+    NULL,
+    0
+  }
+};
+
 //
 // Predefined platform connect sequence
 //
-- 
Anthony PERARD


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