Files
system76-edk2/MdePkg/Library/BaseIoLibIntrinsic/IoLib.c
Min Xu b6b2de8848 MdePkg: Support mmio for Tdx guest in BaseIoLibIntrinsic
RFC: https://bugzilla.tianocore.org/show_bug.cgi?id=3429

TDVF access MMIO with TDG.VP.VMCALL to invoke VMM provided emulation
functions. If the access to MMIO fails, it fall backs to the direct
access.

BaseIoLibIntrinsic.inf is the IoLib used by other packages. It will
not support I/O in Td guest. But some files are shared between
BaseIoLibIntrinsic and BaseIoLibIntrinsicSev (IoLib.c is the example). So
IoLibInternalTdxNull.c (which holds the null stub of the Td I/O routines)
is included in BaseIoLibIntrinsic.inf. BaseIoLibIntrinsic.inf doesn't
import TdxLib so that the Pkgs which include BaseIoLibIntrinsic.inf
need not include TdxLib.

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>
2022-04-02 08:15:12 +00:00

426 lines
9.2 KiB
C

/** @file
Common I/O Library routines.
Copyright (c) 2006 - 2021, Intel Corporation. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
#include "BaseIoLibIntrinsicInternal.h"
#include "IoLibTdx.h"
/**
Reads a 64-bit I/O port.
Reads the 64-bit I/O port specified by Port. The 64-bit read value is returned.
This function must guarantee that all I/O read and write operations are
serialized.
If 64-bit I/O port operations are not supported, then ASSERT().
If Port is not aligned on a 64-bit boundary, then ASSERT().
@param Port The I/O port to read.
@return The value read.
**/
UINT64
EFIAPI
IoRead64 (
IN UINTN Port
)
{
ASSERT (FALSE);
return 0;
}
/**
Writes a 64-bit I/O port.
Writes the 64-bit I/O port specified by Port with the value specified by Value
and returns Value. This function must guarantee that all I/O read and write
operations are serialized.
If 64-bit I/O port operations are not supported, then ASSERT().
If Port is not aligned on a 64-bit boundary, then ASSERT().
@param Port The I/O port to write.
@param Value The value to write to the I/O port.
@return The value written the I/O port.
**/
UINT64
EFIAPI
IoWrite64 (
IN UINTN Port,
IN UINT64 Value
)
{
ASSERT (FALSE);
return 0;
}
/**
Reads an 8-bit MMIO register.
Reads the 8-bit MMIO register specified by Address. The 8-bit read value is
returned. This function must guarantee that all MMIO read and write
operations are serialized.
If 8-bit MMIO register operations are not supported, then ASSERT().
For Td guest TDVMCALL_MMIO is invoked to read MMIO registers.
@param Address The MMIO register to read.
@return The value read.
**/
UINT8
EFIAPI
MmioRead8 (
IN UINTN Address
)
{
UINT8 Value;
BOOLEAN Flag;
Flag = FilterBeforeMmIoRead (FilterWidth8, Address, &Value);
if (Flag) {
MemoryFence ();
if (IsTdxGuest ()) {
Value = TdMmioRead8 (Address);
} else {
Value = *(volatile UINT8 *)Address;
}
MemoryFence ();
}
FilterAfterMmIoRead (FilterWidth8, Address, &Value);
return Value;
}
/**
Writes an 8-bit MMIO register.
Writes the 8-bit MMIO register specified by Address with the value specified
by Value and returns Value. This function must guarantee that all MMIO read
and write operations are serialized.
If 8-bit MMIO register operations are not supported, then ASSERT().
For Td guest TDVMCALL_MMIO is invoked to write MMIO registers.
@param Address The MMIO register to write.
@param Value The value to write to the MMIO register.
@return Value.
**/
UINT8
EFIAPI
MmioWrite8 (
IN UINTN Address,
IN UINT8 Value
)
{
BOOLEAN Flag;
Flag = FilterBeforeMmIoWrite (FilterWidth8, Address, &Value);
if (Flag) {
MemoryFence ();
if (IsTdxGuest ()) {
TdMmioWrite8 (Address, Value);
} else {
*(volatile UINT8 *)Address = Value;
}
MemoryFence ();
}
FilterAfterMmIoWrite (FilterWidth8, Address, &Value);
return Value;
}
/**
Reads a 16-bit MMIO register.
Reads the 16-bit MMIO register specified by Address. The 16-bit read value is
returned. This function must guarantee that all MMIO read and write
operations are serialized.
If 16-bit MMIO register operations are not supported, then ASSERT().
If Address is not aligned on a 16-bit boundary, then ASSERT().
For Td guest TDVMCALL_MMIO is invoked to read MMIO registers.
@param Address The MMIO register to read.
@return The value read.
**/
UINT16
EFIAPI
MmioRead16 (
IN UINTN Address
)
{
UINT16 Value;
BOOLEAN Flag;
ASSERT ((Address & 1) == 0);
Flag = FilterBeforeMmIoRead (FilterWidth16, Address, &Value);
if (Flag) {
MemoryFence ();
if (IsTdxGuest ()) {
Value = TdMmioRead16 (Address);
} else {
Value = *(volatile UINT16 *)Address;
}
MemoryFence ();
}
FilterAfterMmIoRead (FilterWidth16, Address, &Value);
return Value;
}
/**
Writes a 16-bit MMIO register.
Writes the 16-bit MMIO register specified by Address with the value specified
by Value and returns Value. This function must guarantee that all MMIO read
and write operations are serialized.
If 16-bit MMIO register operations are not supported, then ASSERT().
If Address is not aligned on a 16-bit boundary, then ASSERT().
For Td guest TDVMCALL_MMIO is invoked to write MMIO registers.
@param Address The MMIO register to write.
@param Value The value to write to the MMIO register.
@return Value.
**/
UINT16
EFIAPI
MmioWrite16 (
IN UINTN Address,
IN UINT16 Value
)
{
BOOLEAN Flag;
ASSERT ((Address & 1) == 0);
Flag = FilterBeforeMmIoWrite (FilterWidth16, Address, &Value);
if (Flag) {
MemoryFence ();
if (IsTdxGuest ()) {
TdMmioWrite16 (Address, Value);
} else {
*(volatile UINT16 *)Address = Value;
}
MemoryFence ();
}
FilterAfterMmIoWrite (FilterWidth16, Address, &Value);
return Value;
}
/**
Reads a 32-bit MMIO register.
Reads the 32-bit MMIO register specified by Address. The 32-bit read value is
returned. This function must guarantee that all MMIO read and write
operations are serialized.
If 32-bit MMIO register operations are not supported, then ASSERT().
If Address is not aligned on a 32-bit boundary, then ASSERT().
For Td guest TDVMCALL_MMIO is invoked to read MMIO registers.
@param Address The MMIO register to read.
@return The value read.
**/
UINT32
EFIAPI
MmioRead32 (
IN UINTN Address
)
{
UINT32 Value;
BOOLEAN Flag;
ASSERT ((Address & 3) == 0);
Flag = FilterBeforeMmIoRead (FilterWidth32, Address, &Value);
if (Flag) {
MemoryFence ();
if (IsTdxGuest ()) {
Value = TdMmioRead32 (Address);
} else {
Value = *(volatile UINT32 *)Address;
}
MemoryFence ();
}
FilterAfterMmIoRead (FilterWidth32, Address, &Value);
return Value;
}
/**
Writes a 32-bit MMIO register.
Writes the 32-bit MMIO register specified by Address with the value specified
by Value and returns Value. This function must guarantee that all MMIO read
and write operations are serialized.
If 32-bit MMIO register operations are not supported, then ASSERT().
If Address is not aligned on a 32-bit boundary, then ASSERT().
For Td guest TDVMCALL_MMIO is invoked to write MMIO registers.
@param Address The MMIO register to write.
@param Value The value to write to the MMIO register.
@return Value.
**/
UINT32
EFIAPI
MmioWrite32 (
IN UINTN Address,
IN UINT32 Value
)
{
BOOLEAN Flag;
ASSERT ((Address & 3) == 0);
Flag = FilterBeforeMmIoWrite (FilterWidth32, Address, &Value);
if (Flag) {
MemoryFence ();
if (IsTdxGuest ()) {
TdMmioWrite32 (Address, Value);
} else {
*(volatile UINT32 *)Address = Value;
}
MemoryFence ();
}
FilterAfterMmIoWrite (FilterWidth32, Address, &Value);
return Value;
}
/**
Reads a 64-bit MMIO register.
Reads the 64-bit MMIO register specified by Address. The 64-bit read value is
returned. This function must guarantee that all MMIO read and write
operations are serialized.
If 64-bit MMIO register operations are not supported, then ASSERT().
If Address is not aligned on a 64-bit boundary, then ASSERT().
For Td guest TDVMCALL_MMIO is invoked to read MMIO registers.
@param Address The MMIO register to read.
@return The value read.
**/
UINT64
EFIAPI
MmioRead64 (
IN UINTN Address
)
{
UINT64 Value;
BOOLEAN Flag;
ASSERT ((Address & 7) == 0);
Flag = FilterBeforeMmIoRead (FilterWidth64, Address, &Value);
if (Flag) {
MemoryFence ();
if (IsTdxGuest ()) {
Value = TdMmioRead64 (Address);
} else {
Value = *(volatile UINT64 *)Address;
}
MemoryFence ();
}
FilterAfterMmIoRead (FilterWidth64, Address, &Value);
return Value;
}
/**
Writes a 64-bit MMIO register.
Writes the 64-bit MMIO register specified by Address with the value specified
by Value and returns Value. This function must guarantee that all MMIO read
and write operations are serialized.
If 64-bit MMIO register operations are not supported, then ASSERT().
If Address is not aligned on a 64-bit boundary, then ASSERT().
For Td guest TDVMCALL_MMIO is invoked to write MMIO registers.
@param Address The MMIO register to write.
@param Value The value to write to the MMIO register.
**/
UINT64
EFIAPI
MmioWrite64 (
IN UINTN Address,
IN UINT64 Value
)
{
BOOLEAN Flag;
ASSERT ((Address & 7) == 0);
Flag = FilterBeforeMmIoWrite (FilterWidth64, Address, &Value);
if (Flag) {
MemoryFence ();
if (IsTdxGuest ()) {
TdMmioWrite64 (Address, Value);
} else {
*(volatile UINT64 *)Address = Value;
}
MemoryFence ();
}
FilterAfterMmIoWrite (FilterWidth64, Address, &Value);
return Value;
}