MdePkg: Support IoRead/IoWrite for Tdx guest in BaseIoLibIntrinsic

RFC: https://bugzilla.tianocore.org/show_bug.cgi?id=3429

This commit supports IoRead/IoWrite for SEV/TDX/Legacy guest in one
binary. It checks the guest type in runtime and then call corresponding
functions.

Cc: Michael D Kinney <michael.d.kinney@intel.com>
Cc: Liming Gao <gaoliming@byosoft.com.cn>
Cc: Zhiguang Liu <zhiguang.liu@intel.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: Tom Lendacky <thomas.lendacky@amd.com>
Cc: Gerd Hoffmann <kraxel@redhat.com>
Acked-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Liming Gao <gaoliming@byosoft.com.cn>
Reviewed-by: Jiewen Yao <jiewen.yao@intel.com>
Signed-off-by: Min Xu <min.m.xu@intel.com>

MdePkg/Library/BaseIoLibIntrinsic/IoLibGcc.c

@@ -16,6 +16,7 @@
 **/
 
 #include "BaseIoLibIntrinsicInternal.h"
+#include "IoLibTdx.h"
 
 /**
   Reads an 8-bit I/O port.
@@ -24,7 +25,9 @@
   This function must guarantee that all I/O read and write operations are
   serialized.
 
-  If 8-bit I/O port operations are not supported, then ASSERT().
+  If 8-bit I/O port operations are not supported, then ASSERT()
+
+  For Td guest TDVMCALL_IO is invoked to read I/O port.
 
   @param  Port  The I/O port to read.
 
@@ -42,7 +45,11 @@ IoRead8 (
 
   Flag = FilterBeforeIoRead (FilterWidth8, Port, &Data);
   if (Flag) {
-    __asm__ __volatile__ ("inb %w1,%b0" : "=a" (Data) : "d" ((UINT16)Port));
+    if (IsTdxGuest ()) {
+      Data = TdIoRead8 (Port);
+    } else {
+      __asm__ __volatile__ ("inb %w1,%b0" : "=a" (Data) : "d" ((UINT16)Port));
+    }
   }
 
   FilterAfterIoRead (FilterWidth8, Port, &Data);
@@ -59,6 +66,8 @@ IoRead8 (
 
   If 8-bit I/O port operations are not supported, then ASSERT().
 
+  For Td guest TDVMCALL_IO is invoked to write I/O port.
+
   @param  Port  The I/O port to write.
   @param  Value The value to write to the I/O port.
 
@@ -76,7 +85,11 @@ IoWrite8 (
 
   Flag = FilterBeforeIoWrite (FilterWidth8, Port, &Value);
   if (Flag) {
-    __asm__ __volatile__ ("outb %b0,%w1" : : "a" (Value), "d" ((UINT16)Port));
+    if (IsTdxGuest ()) {
+      TdIoWrite8 (Port, Value);
+    } else {
+      __asm__ __volatile__ ("outb %b0,%w1" : : "a" (Value), "d" ((UINT16)Port));
+    }
   }
 
   FilterAfterIoWrite (FilterWidth8, Port, &Value);
@@ -94,6 +107,8 @@ IoWrite8 (
   If 16-bit I/O port operations are not supported, then ASSERT().
   If Port is not aligned on a 16-bit boundary, then ASSERT().
 
+  For Td guest TDVMCALL_IO is invoked to read I/O port.
+
   @param  Port  The I/O port to read.
 
   @return The value read.
@@ -112,7 +127,11 @@ IoRead16 (
 
   Flag = FilterBeforeIoRead (FilterWidth16, Port, &Data);
   if (Flag) {
-    __asm__ __volatile__ ("inw %w1,%w0" : "=a" (Data) : "d" ((UINT16)Port));
+    if (IsTdxGuest ()) {
+      Data = TdIoRead16 (Port);
+    } else {
+      __asm__ __volatile__ ("inw %w1,%w0" : "=a" (Data) : "d" ((UINT16)Port));
+    }
   }
 
   FilterAfterIoRead (FilterWidth16, Port, &Data);
@@ -130,6 +149,8 @@ IoRead16 (
   If 16-bit I/O port operations are not supported, then ASSERT().
   If Port is not aligned on a 16-bit boundary, then ASSERT().
 
+  For Td guest TDVMCALL_IO is invoked to write I/O port.
+
   @param  Port  The I/O port to write.
   @param  Value The value to write to the I/O port.
 
@@ -149,7 +170,11 @@ IoWrite16 (
 
   Flag = FilterBeforeIoWrite (FilterWidth16, Port, &Value);
   if (Flag) {
-    __asm__ __volatile__ ("outw %w0,%w1" : : "a" (Value), "d" ((UINT16)Port));
+    if (IsTdxGuest ()) {
+      TdIoWrite16 (Port, Value);
+    } else {
+      __asm__ __volatile__ ("outw %w0,%w1" : : "a" (Value), "d" ((UINT16)Port));
+    }
   }
 
   FilterAfterIoWrite (FilterWidth16, Port, &Value);
@@ -167,6 +192,8 @@ IoWrite16 (
   If 32-bit I/O port operations are not supported, then ASSERT().
   If Port is not aligned on a 32-bit boundary, then ASSERT().
 
+  For Td guest TDVMCALL_IO is invoked to read I/O port.
+
   @param  Port  The I/O port to read.
 
   @return The value read.
@@ -185,7 +212,11 @@ IoRead32 (
 
   Flag = FilterBeforeIoRead (FilterWidth32, Port, &Data);
   if (Flag) {
-    __asm__ __volatile__ ("inl %w1,%0" : "=a" (Data) : "d" ((UINT16)Port));
+    if (IsTdxGuest ()) {
+      Data = TdIoRead32 (Port);
+    } else {
+      __asm__ __volatile__ ("inl %w1,%0" : "=a" (Data) : "d" ((UINT16)Port));
+    }
   }
 
   FilterAfterIoRead (FilterWidth32, Port, &Data);
@@ -203,6 +234,8 @@ IoRead32 (
   If 32-bit I/O port operations are not supported, then ASSERT().
   If Port is not aligned on a 32-bit boundary, then ASSERT().
 
+  For Td guest TDVMCALL_IO is invoked to write I/O port.
+
   @param  Port  The I/O port to write.
   @param  Value The value to write to the I/O port.
 
@@ -222,7 +255,11 @@ IoWrite32 (
 
   Flag = FilterBeforeIoWrite (FilterWidth32, Port, &Value);
   if (Flag) {
-    __asm__ __volatile__ ("outl %0,%w1" : : "a" (Value), "d" ((UINT16)Port));
+    if (IsTdxGuest ()) {
+      TdIoWrite32 (Port, Value);
+    } else {
+      __asm__ __volatile__ ("outl %0,%w1" : : "a" (Value), "d" ((UINT16)Port));
+    }
   }
 
   FilterAfterIoWrite (FilterWidth32, Port, &Value);

MdePkg/Library/BaseIoLibIntrinsic/IoLibMsc.c

@@ -14,6 +14,7 @@
 **/
 
 #include "BaseIoLibIntrinsicInternal.h"
+#include "IoLibTdx.h"
 
 //
 // Microsoft Visual Studio 7.1 Function Prototypes for I/O Intrinsics.
@@ -82,6 +83,8 @@ _ReadWriteBarrier (
 
   If 8-bit I/O port operations are not supported, then ASSERT().
 
+  For Td guest TDVMCALL_IO is invoked to read I/O port.
+
   @param  Port  The I/O port to read.
 
   @return The value read.
@@ -98,9 +101,13 @@ IoRead8 (
 
   Flag = FilterBeforeIoRead (FilterWidth8, Port, &Value);
   if (Flag) {
-    _ReadWriteBarrier ();
+    if (IsTdxGuest ()) {
-    Value = (UINT8)_inp ((UINT16)Port);
+      Value = TdIoRead8 (Port);
-    _ReadWriteBarrier ();
+    } else {
+      _ReadWriteBarrier ();
+      Value = (UINT8)_inp ((UINT16)Port);
+      _ReadWriteBarrier ();
+    }
   }
 
   FilterAfterIoRead (FilterWidth8, Port, &Value);
@@ -117,6 +124,8 @@ IoRead8 (
 
   If 8-bit I/O port operations are not supported, then ASSERT().
 
+  For Td guest TDVMCALL_IO is invoked to write I/O port.
+
   @param  Port  The I/O port to write.
   @param  Value The value to write to the I/O port.
 
@@ -134,9 +143,13 @@ IoWrite8 (
 
   Flag = FilterBeforeIoWrite (FilterWidth8, Port, &Value);
   if (Flag) {
-    _ReadWriteBarrier ();
+    if (IsTdxGuest ()) {
-    (UINT8)_outp ((UINT16)Port, Value);
+      TdIoWrite8 (Port, Value);
-    _ReadWriteBarrier ();
+    } else {
+      _ReadWriteBarrier ();
+      (UINT8)_outp ((UINT16)Port, Value);
+      _ReadWriteBarrier ();
+    }
   }
 
   FilterAfterIoWrite (FilterWidth8, Port, &Value);
@@ -154,6 +167,8 @@ IoWrite8 (
   If 16-bit I/O port operations are not supported, then ASSERT().
   If Port is not aligned on a 16-bit boundary, then ASSERT().
 
+  For Td guest TDVMCALL_IO is invoked to read I/O port.
+
   @param  Port  The I/O port to read.
 
   @return The value read.
@@ -172,9 +187,13 @@ IoRead16 (
 
   Flag = FilterBeforeIoRead (FilterWidth16, Port, &Value);
   if (Flag) {
-    _ReadWriteBarrier ();
+    if (IsTdxGuest ()) {
-    Value = _inpw ((UINT16)Port);
+      Value = TdIoRead16 (Port);
-    _ReadWriteBarrier ();
+    } else {
+      _ReadWriteBarrier ();
+      Value = _inpw ((UINT16)Port);
+      _ReadWriteBarrier ();
+    }
   }
 
   FilterBeforeIoRead (FilterWidth16, Port, &Value);
@@ -192,6 +211,8 @@ IoRead16 (
   If 16-bit I/O port operations are not supported, then ASSERT().
   If Port is not aligned on a 16-bit boundary, then ASSERT().
 
+  For Td guest TDVMCALL_IO is invoked to write I/O port.
+
   @param  Port  The I/O port to write.
   @param  Value The value to write to the I/O port.
 
@@ -211,9 +232,13 @@ IoWrite16 (
 
   Flag = FilterBeforeIoWrite (FilterWidth16, Port, &Value);
   if (Flag) {
-    _ReadWriteBarrier ();
+    if (IsTdxGuest ()) {
-    _outpw ((UINT16)Port, Value);
+      TdIoWrite16 (Port, Value);
-    _ReadWriteBarrier ();
+    } else {
+      _ReadWriteBarrier ();
+      _outpw ((UINT16)Port, Value);
+      _ReadWriteBarrier ();
+    }
   }
 
   FilterAfterIoWrite (FilterWidth16, Port, &Value);
@@ -231,6 +256,8 @@ IoWrite16 (
   If 32-bit I/O port operations are not supported, then ASSERT().
   If Port is not aligned on a 32-bit boundary, then ASSERT().
 
+  For Td guest TDVMCALL_IO is invoked to read I/O port.
+
   @param  Port  The I/O port to read.
 
   @return The value read.
@@ -249,9 +276,13 @@ IoRead32 (
 
   Flag = FilterBeforeIoRead (FilterWidth32, Port, &Value);
   if (Flag) {
-    _ReadWriteBarrier ();
+    if (IsTdxGuest ()) {
-    Value = _inpd ((UINT16)Port);
+      Value = TdIoRead32 (Port);
-    _ReadWriteBarrier ();
+    } else {
+      _ReadWriteBarrier ();
+      Value = _inpd ((UINT16)Port);
+      _ReadWriteBarrier ();
+    }
   }
 
   FilterAfterIoRead (FilterWidth32, Port, &Value);
@@ -269,6 +300,8 @@ IoRead32 (
   If 32-bit I/O port operations are not supported, then ASSERT().
   If Port is not aligned on a 32-bit boundary, then ASSERT().
 
+  For Td guest TDVMCALL_IO is invoked to write I/O port.
+
   @param  Port  The I/O port to write.
   @param  Value The value to write to the I/O port.
 
@@ -288,9 +321,13 @@ IoWrite32 (
 
   Flag = FilterBeforeIoWrite (FilterWidth32, Port, &Value);
   if (Flag) {
-    _ReadWriteBarrier ();
+    if (IsTdxGuest ()) {
-    _outpd ((UINT16)Port, Value);
+      TdIoWrite32 (Port, Value);
-    _ReadWriteBarrier ();
+    } else {
+      _ReadWriteBarrier ();
+      _outpd ((UINT16)Port, Value);
+      _ReadWriteBarrier ();
+    }
   }
 
   FilterAfterIoWrite (FilterWidth32, Port, &Value);