SnpPageStateChangeInternal.c File Reference

#include <Uefi/UefiBaseType.h>
#include <Library/BaseLib.h>
#include <Library/BaseMemoryLib.h>
#include <Library/MemEncryptSevLib.h>
#include <Library/DebugLib.h>
#include <Library/CcExitLib.h>
#include <Library/AmdSvsmLib.h>
#include <Register/Amd/Ghcb.h>
#include <Register/Amd/Msr.h>
#include <Register/Amd/Svsm.h>
#include "SnpPageStateChange.h"

Go to the source code of this file.

Functions
STATIC UINTN	MemoryStateToGhcbOp (IN SEV_SNP_PAGE_STATE State)
VOID	SnpPageStateFailureTerminate (VOID)
STATIC EFI_PHYSICAL_ADDRESS	BuildPageStateBuffer (IN EFI_PHYSICAL_ADDRESS BaseAddress, IN EFI_PHYSICAL_ADDRESS EndAddress, IN SEV_SNP_PAGE_STATE State, IN BOOLEAN UseLargeEntry, IN SNP_PAGE_STATE_CHANGE_INFO *Info, IN UINTN InfoSize)
STATIC VOID	PageStateChangeVmgExit (IN GHCB *Ghcb, IN SNP_PAGE_STATE_ENTRY *Start, IN UINT16 Count)
STATIC VOID	PageStateChange (IN SNP_PAGE_STATE_CHANGE_INFO *Info)
VOID	InternalSetPageState (IN EFI_PHYSICAL_ADDRESS BaseAddress, IN UINTN NumPages, IN SEV_SNP_PAGE_STATE State, IN BOOLEAN UseLargeEntry, IN VOID *PscBuffer, IN UINTN PscBufferSize)

Detailed Description

SEV-SNP Page Validation functions.

Copyright (c) 2021 - 2024, AMD Incorporated. All rights reserved.

SPDX-License-Identifier: BSD-2-Clause-Patent

Definition in file SnpPageStateChangeInternal.c.

Function Documentation

BuildPageStateBuffer()

STATIC EFI_PHYSICAL_ADDRESS BuildPageStateBuffer	(	IN EFI_PHYSICAL_ADDRESS	BaseAddress,
		IN EFI_PHYSICAL_ADDRESS	EndAddress,
		IN SEV_SNP_PAGE_STATE	State,
		IN BOOLEAN	UseLargeEntry,
		IN SNP_PAGE_STATE_CHANGE_INFO *	Info,
		IN UINTN	InfoSize
	)

Definition at line 68 of file SnpPageStateChangeInternal.c.

InternalSetPageState()

VOID InternalSetPageState	(	IN EFI_PHYSICAL_ADDRESS	BaseAddress,
		IN UINTN	NumPages,
		IN SEV_SNP_PAGE_STATE	State,
		IN BOOLEAN	UseLargeEntry,
		IN VOID *	PscBuffer,
		IN UINTN	PscBufferSize
	)

The function is used to set the page state when SEV-SNP is active. The page state transition consist of changing the page ownership in the RMP table, and using the PVALIDATE instruction to update the Validated bit in RMP table.

When the UseLargeEntry is set to TRUE, then function will try to use the large RMP entry (whevever possible).

Definition at line 225 of file SnpPageStateChangeInternal.c.

MemoryStateToGhcbOp()

STATIC UINTN MemoryStateToGhcbOp

(

IN SEV_SNP_PAGE_STATE

State

)

Definition at line 27 of file SnpPageStateChangeInternal.c.

PageStateChange()

STATIC VOID PageStateChange

(

IN SNP_PAGE_STATE_CHANGE_INFO *

Info

)

Definition at line 192 of file SnpPageStateChangeInternal.c.

PageStateChangeVmgExit()

STATIC VOID PageStateChangeVmgExit	(	IN GHCB *	Ghcb,
		IN SNP_PAGE_STATE_ENTRY *	Start,
		IN UINT16	Count
	)

Definition at line 138 of file SnpPageStateChangeInternal.c.

SnpPageStateFailureTerminate()

VOID SnpPageStateFailureTerminate

(

VOID

)

Definition at line 45 of file SnpPageStateChangeInternal.c.