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system76-edk2/MdePkg/Library/BaseIoLibIntrinsic/IoLibInternalTdx.c
Min Xu ab9d790901 MdePkg: Add helper functions for Tdx guest in BaseIoLibIntrinsic 
RFC: https://bugzilla.tianocore.org/show_bug.cgi?id=3429

Intel TDX architecture does not prescribe a specific software convention
to perform I/O from the guest TD. Guest TD providers have many choices to
provide I/O to the guest. The common I/O models are emulated devices,
para-virtualized devices, SRIOV devices and Direct Device assignments.

TDVF chooses para-virtualized I/O (Choice-A) which use the TDG.VP.VMCALL
function to invoke the funtions provided by the host VMM to perform I/O.
Another choice (Choice-B) is the emulation performed by the #VE handler.

There are 2 benefits of para-virtualized I/O:
1. Performance.
   VMEXIT/VMENTRY is skipped so that the performance is better than #VE
   handler.
2. De-couple with #VE handler.
   Choice-B depends on the #VE handler which means I/O is not available
   until #VE handler is installed. For example, in PEI phase #VE handler
   is installed in CpuMpPei, while communication with Qemu (via I/O port)
   happen earlier than it.

IoLibInternalTdx.c provides the helper functions for Tdx guest.
IoLibInternalTdxNull.c provides the null version of the helper functions.
It is included in the Non-X64 IoLib so that the build will not be broken.

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>
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

675 lines
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/** @file
TDX I/O Library routines.
Copyright (c) 2020-2021, Intel Corporation. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
#include "BaseIoLibIntrinsicInternal.h"
#include <Uefi/UefiBaseType.h>
#include <Include/IndustryStandard/Tdx.h>
#include <Library/TdxLib.h>
#include <Register/Intel/Cpuid.h>
#include "IoLibTdx.h"
// Size of TDVMCALL Access, including IO and MMIO
#define TDVMCALL_ACCESS_SIZE_1 1
#define TDVMCALL_ACCESS_SIZE_2 2
#define TDVMCALL_ACCESS_SIZE_4 4
#define TDVMCALL_ACCESS_SIZE_8 8
// Direction of TDVMCALL Access, including IO and MMIO
#define TDVMCALL_ACCESS_READ 0
#define TDVMCALL_ACCESS_WRITE 1
BOOLEAN mTdxEnabled = FALSE;
BOOLEAN mTdxProbed = FALSE;
/**
Check if it is Tdx guest.
@return TRUE It is Tdx guest
@return FALSE It is not Tdx guest
**/
BOOLEAN
EFIAPI
IsTdxGuest (
VOID
)
{
if (mTdxProbed) {
return mTdxEnabled;
}
mTdxEnabled = TdIsEnabled ();
mTdxProbed = TRUE;
return mTdxEnabled;
}
/**
Reads an 8-bit I/O port.
TDVMCALL_IO is invoked to read I/O port.
@param Port The I/O port to read.
@return The value read.
**/
UINT8
EFIAPI
TdIoRead8 (
IN UINTN Port
)
{
UINT64 Status;
UINT64 Val;
Status = TdVmCall (TDVMCALL_IO, TDVMCALL_ACCESS_SIZE_1, TDVMCALL_ACCESS_READ, Port, 0, &Val);
if (Status != 0) {
TdVmCall (TDVMCALL_HALT, 0, 0, 0, 0, 0);
}
return (UINT8)Val;
}
/**
Reads a 16-bit I/O port.
TDVMCALL_IO is invoked to write I/O port.
@param Port The I/O port to read.
@return The value read.
**/
UINT16
EFIAPI
TdIoRead16 (
IN UINTN Port
)
{
UINT64 Status;
UINT64 Val;
ASSERT ((Port & 1) == 0);
Status = TdVmCall (TDVMCALL_IO, TDVMCALL_ACCESS_SIZE_2, TDVMCALL_ACCESS_READ, Port, 0, &Val);
if (Status != 0) {
TdVmCall (TDVMCALL_HALT, 0, 0, 0, 0, 0);
}
return (UINT16)Val;
}
/**
Reads a 32-bit I/O port.
TDVMCALL_IO is invoked to read I/O port.
@param Port The I/O port to read.
@return The value read.
**/
UINT32
EFIAPI
TdIoRead32 (
IN UINTN Port
)
{
UINT64 Status;
UINT64 Val;
ASSERT ((Port & 3) == 0);
Status = TdVmCall (TDVMCALL_IO, TDVMCALL_ACCESS_SIZE_4, TDVMCALL_ACCESS_READ, Port, 0, &Val);
if (Status != 0) {
TdVmCall (TDVMCALL_HALT, 0, 0, 0, 0, 0);
}
return (UINT32)Val;
}
/**
Writes an 8-bit I/O port.
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.
@return The value written the I/O port.
**/
UINT8
EFIAPI
TdIoWrite8 (
IN UINTN Port,
IN UINT8 Value
)
{
UINT64 Status;
UINT64 Val;
Val = Value;
Status = TdVmCall (TDVMCALL_IO, TDVMCALL_ACCESS_SIZE_1, TDVMCALL_ACCESS_WRITE, Port, Val, 0);
if (Status != 0) {
TdVmCall (TDVMCALL_HALT, 0, 0, 0, 0, 0);
}
return Value;
}
/**
Writes a 16-bit I/O port.
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.
@return The value written the I/O port.
**/
UINT16
EFIAPI
TdIoWrite16 (
IN UINTN Port,
IN UINT16 Value
)
{
UINT64 Status;
UINT64 Val;
ASSERT ((Port & 1) == 0);
Val = Value;
Status = TdVmCall (TDVMCALL_IO, TDVMCALL_ACCESS_SIZE_2, TDVMCALL_ACCESS_WRITE, Port, Val, 0);
if (Status != 0) {
TdVmCall (TDVMCALL_HALT, 0, 0, 0, 0, 0);
}
return Value;
}
/**
Writes a 32-bit I/O port.
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.
@return The value written the I/O port.
**/
UINT32
EFIAPI
TdIoWrite32 (
IN UINTN Port,
IN UINT32 Value
)
{
UINT64 Status;
UINT64 Val;
ASSERT ((Port & 3) == 0);
Val = Value;
Status = TdVmCall (TDVMCALL_IO, TDVMCALL_ACCESS_SIZE_4, TDVMCALL_ACCESS_WRITE, Port, Val, 0);
if (Status != 0) {
TdVmCall (TDVMCALL_HALT, 0, 0, 0, 0, 0);
}
return Value;
}
/**
Reads an 8-bit MMIO register.
TDVMCALL_MMIO is invoked to read MMIO registers.
@param Address The MMIO register to read.
@return The value read.
**/
UINT8
EFIAPI
TdMmioRead8 (
IN UINTN Address
)
{
UINT64 Value;
UINT64 Status;
Status = TdVmCall (TDVMCALL_MMIO, TDVMCALL_ACCESS_SIZE_1, TDVMCALL_ACCESS_READ, Address | TdSharedPageMask (), 0, &Value);
if (Status != 0) {
Value = *(volatile UINT64 *)Address;
}
return (UINT8)Value;
}
/**
Writes an 8-bit MMIO register.
TDVMCALL_MMIO is invoked to read write registers.
@param Address The MMIO register to write.
@param Value The value to write to the MMIO register.
@return Value.
**/
UINT8
EFIAPI
TdMmioWrite8 (
IN UINTN Address,
IN UINT8 Value
)
{
UINT64 Val;
UINT64 Status;
Val = Value;
Status = TdVmCall (TDVMCALL_MMIO, TDVMCALL_ACCESS_SIZE_1, TDVMCALL_ACCESS_WRITE, Address | TdSharedPageMask (), Val, 0);
if (Status != 0) {
*(volatile UINT8 *)Address = Value;
}
return Value;
}
/**
Reads a 16-bit MMIO register.
TDVMCALL_MMIO is invoked to read MMIO registers.
@param Address The MMIO register to read.
@return The value read.
**/
UINT16
EFIAPI
TdMmioRead16 (
IN UINTN Address
)
{
UINT64 Value;
UINT64 Status;
Status = TdVmCall (TDVMCALL_MMIO, TDVMCALL_ACCESS_SIZE_2, TDVMCALL_ACCESS_READ, Address | TdSharedPageMask (), 0, &Value);
if (Status != 0) {
Value = *(volatile UINT64 *)Address;
}
return (UINT16)Value;
}
/**
Writes a 16-bit MMIO register.
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
TdMmioWrite16 (
IN UINTN Address,
IN UINT16 Value
)
{
UINT64 Val;
UINT64 Status;
ASSERT ((Address & 1) == 0);
Val = Value;
Status = TdVmCall (TDVMCALL_MMIO, TDVMCALL_ACCESS_SIZE_2, TDVMCALL_ACCESS_WRITE, Address | TdSharedPageMask (), Val, 0);
if (Status != 0) {
*(volatile UINT16 *)Address = Value;
}
return Value;
}
/**
Reads a 32-bit MMIO register.
TDVMCALL_MMIO is invoked to read MMIO registers.
@param Address The MMIO register to read.
@return The value read.
**/
UINT32
EFIAPI
TdMmioRead32 (
IN UINTN Address
)
{
UINT64 Value;
UINT64 Status;
Status = TdVmCall (TDVMCALL_MMIO, TDVMCALL_ACCESS_SIZE_4, TDVMCALL_ACCESS_READ, Address | TdSharedPageMask (), 0, &Value);
if (Status != 0) {
Value = *(volatile UINT64 *)Address;
}
return (UINT32)Value;
}
/**
Writes a 32-bit MMIO register.
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
TdMmioWrite32 (
IN UINTN Address,
IN UINT32 Value
)
{
UINT64 Val;
UINT64 Status;
ASSERT ((Address & 3) == 0);
Val = Value;
Status = TdVmCall (TDVMCALL_MMIO, TDVMCALL_ACCESS_SIZE_4, TDVMCALL_ACCESS_WRITE, Address | TdSharedPageMask (), Val, 0);
if (Status != 0) {
*(volatile UINT32 *)Address = Value;
}
return Value;
}
/**
Reads a 64-bit MMIO register.
TDVMCALL_MMIO is invoked to read MMIO registers.
@param Address The MMIO register to read.
@return The value read.
**/
UINT64
EFIAPI
TdMmioRead64 (
IN UINTN Address
)
{
UINT64 Value;
UINT64 Status;
Status = TdVmCall (TDVMCALL_MMIO, TDVMCALL_ACCESS_SIZE_8, TDVMCALL_ACCESS_READ, Address | TdSharedPageMask (), 0, &Value);
if (Status != 0) {
Value = *(volatile UINT64 *)Address;
}
return Value;
}
/**
Writes a 64-bit MMIO register.
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
TdMmioWrite64 (
IN UINTN Address,
IN UINT64 Value
)
{
UINT64 Status;
UINT64 Val;
ASSERT ((Address & 7) == 0);
Val = Value;
Status = TdVmCall (TDVMCALL_MMIO, TDVMCALL_ACCESS_SIZE_8, TDVMCALL_ACCESS_WRITE, Address | TdSharedPageMask (), Val, 0);
if (Status != 0) {
*(volatile UINT64 *)Address = Value;
}
return Value;
}
/**
Reads an 8-bit I/O port fifo into a block of memory.
Reads the 8-bit I/O fifo port specified by Port.
The port is read Count times, and the read data is
stored in the provided Buffer.
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().
In TDX a serial of TdIoRead8 is invoked to read the I/O port fifo.
@param Port The I/O port to read.
@param Count The number of times to read I/O port.
@param Buffer The buffer to store the read data into.
**/
VOID
EFIAPI
TdIoReadFifo8 (
IN UINTN Port,
IN UINTN Count,
OUT VOID *Buffer
)
{
UINT8 *Buf8;
UINTN Index;
Buf8 = (UINT8 *)Buffer;
for (Index = 0; Index < Count; Index++) {
Buf8[Index] = TdIoRead8 (Port);
}
}
/**
Writes a block of memory into an 8-bit I/O port fifo.
Writes the 8-bit I/O fifo port specified by Port.
The port is written Count times, and the write data is
retrieved from the provided Buffer.
This function must guarantee that all I/O write and write operations are
serialized.
If 8-bit I/O port operations are not supported, then ASSERT().
In TDX a serial of TdIoWrite8 is invoked to write data to the I/O port.
@param Port The I/O port to write.
@param Count The number of times to write I/O port.
@param Buffer The buffer to retrieve the write data from.
**/
VOID
EFIAPI
TdIoWriteFifo8 (
IN UINTN Port,
IN UINTN Count,
IN VOID *Buffer
)
{
UINT8 *Buf8;
UINTN Index;
Buf8 = (UINT8 *)Buffer;
for (Index = 0; Index < Count; Index++) {
TdIoWrite8 (Port, Buf8[Index]);
}
}
/**
Reads a 16-bit I/O port fifo into a block of memory.
Reads the 16-bit I/O fifo port specified by Port.
The port is read Count times, and the read data is
stored in the provided Buffer.
This function must guarantee that all I/O read and write operations are
serialized.
If 16-bit I/O port operations are not supported, then ASSERT().
In TDX a serial of TdIoRead16 is invoked to read data from the I/O port.
@param Port The I/O port to read.
@param Count The number of times to read I/O port.
@param Buffer The buffer to store the read data into.
**/
VOID
EFIAPI
TdIoReadFifo16 (
IN UINTN Port,
IN UINTN Count,
OUT VOID *Buffer
)
{
UINT16 *Buf16;
UINTN Index;
Buf16 = (UINT16 *)Buffer;
for (Index = 0; Index < Count; Index++) {
Buf16[Index] = TdIoRead16 (Port);
}
}
/**
Writes a block of memory into a 16-bit I/O port fifo.
Writes the 16-bit I/O fifo port specified by Port.
The port is written Count times, and the write data is
retrieved from the provided Buffer.
This function must guarantee that all I/O write and write operations are
serialized.
If 16-bit I/O port operations are not supported, then ASSERT().
In TDX a serial of TdIoWrite16 is invoked to write data to the I/O port.
@param Port The I/O port to write.
@param Count The number of times to write I/O port.
@param Buffer The buffer to retrieve the write data from.
**/
VOID
EFIAPI
TdIoWriteFifo16 (
IN UINTN Port,
IN UINTN Count,
IN VOID *Buffer
)
{
UINT16 *Buf16;
UINTN Index;
Buf16 = (UINT16 *)Buffer;
for (Index = 0; Index < Count; Index++) {
TdIoWrite16 (Port, Buf16[Index]);
}
}
/**
Reads a 32-bit I/O port fifo into a block of memory.
Reads the 32-bit I/O fifo port specified by Port.
The port is read Count times, and the read data is
stored in the provided Buffer.
This function must guarantee that all I/O read and write operations are
serialized.
If 32-bit I/O port operations are not supported, then ASSERT().
In TDX a serial of TdIoRead32 is invoked to read data from the I/O port.
@param Port The I/O port to read.
@param Count The number of times to read I/O port.
@param Buffer The buffer to store the read data into.
**/
VOID
EFIAPI
TdIoReadFifo32 (
IN UINTN Port,
IN UINTN Count,
OUT VOID *Buffer
)
{
UINT32 *Buf32;
UINTN Index;
Buf32 = (UINT32 *)Buffer;
for (Index = 0; Index < Count; Index++) {
Buf32[Index] = TdIoRead32 (Port);
}
}
/**
Writes a block of memory into a 32-bit I/O port fifo.
Writes the 32-bit I/O fifo port specified by Port.
The port is written Count times, and the write data is
retrieved from the provided Buffer.
This function must guarantee that all I/O write and write operations are
serialized.
If 32-bit I/O port operations are not supported, then ASSERT().
In TDX a serial of TdIoWrite32 is invoked to write data to the I/O port.
@param Port The I/O port to write.
@param Count The number of times to write I/O port.
@param Buffer The buffer to retrieve the write data from.
**/
VOID
EFIAPI
TdIoWriteFifo32 (
IN UINTN Port,
IN UINTN Count,
IN VOID *Buffer
)
{
UINT32 *Buf32;
UINTN Index;
Buf32 = (UINT32 *)Buffer;
for (Index = 0; Index < Count; Index++) {
TdIoWrite32 (Port, Buf32[Index]);
}
}
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