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/** @file
SEV-SNP Page Validation functions.
Copyright (c) 2021 AMD Incorporated. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
#include <Uefi/UefiBaseType.h>
#include <Library/BaseLib.h>
#include <Library/DebugLib.h>
#include <Library/MemEncryptSevLib.h>
#include "SnpPageStateChange.h"
#include "VirtualMemory.h"
/**
Pre-validate the system RAM when SEV-SNP is enabled in the guest VM.
@param[in] BaseAddress Base address
@param[in] NumPages Number of pages starting from the base address
**/
VOID
EFIAPI
MemEncryptSevSnpPreValidateSystemRam (
IN PHYSICAL_ADDRESS BaseAddress,
IN UINTN NumPages
)
{
EFI_STATUS Status;
if (!MemEncryptSevSnpIsEnabled ()) {
return;
}
// DXE pre-validation may happen with the memory accept protocol.
// The protocol should only be called outside the prevalidated ranges
// that the PEI stage code explicitly skips. Specifically, only memory
// ranges that are classified as unaccepted.
if (BaseAddress >= SIZE_4GB) {
Status = InternalMemEncryptSevCreateIdentityMap1G (
0,
BaseAddress,
EFI_PAGES_TO_SIZE (NumPages)
);
if (EFI_ERROR (Status)) {
ASSERT (FALSE);
CpuDeadLoop ();
}
}
InternalSetPageState (BaseAddress, NumPages, SevSnpPagePrivate, TRUE);
}
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