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OvmfPkg/QemuFwCfgLib: Implement SEV internal functions for PEI phase 

Cc: Jordan Justen <jordan.l.justen@intel.com>
Cc: Laszlo Ersek <lersek@redhat.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Brijesh Singh <brijesh.singh@amd.com>
Reviewed-by: Laszlo Ersek <lersek@redhat.com>
Reviewed-by: Jordan Justen <jordan.l.justen@intel.com>
This commit is contained in:
Brijesh Singh 2017-07-06 09:29:03 -04:00 committed by Jordan Justen
parent 6264abc29e
commit 5feae25392
2 changed files with 71 additions and 2 deletions
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72
OvmfPkg/Library/QemuFwCfgLib/QemuFwCfgPei.c
View File

@ -4,6 +4,7 @@
Copyright (C) 2013, Red Hat, Inc.
Copyright (c) 2011 - 2013, Intel Corporation. All rights reserved.<BR>
Copyright (c) 2017, Advanced Micro Devices. All rights reserved.<BR>
This program and the accompanying materials are licensed and made available
under the terms and conditions of the BSD License which accompanies this
@ -14,8 +15,10 @@
WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
**/
#include <Library/BaseLib.h>
#include <Library/DebugLib.h>
#include <Library/QemuFwCfgLib.h>
#include <Library/MemEncryptSevLib.h>
#include "QemuFwCfgLibInternal.h"
@ -76,8 +79,18 @@ QemuFwCfgInitialize (
if ((Revision & FW_CFG_F_DMA) == 0) {
DEBUG ((DEBUG_INFO, "QemuFwCfg interface (IO Port) is supported.\n"));
} else {
mQemuFwCfgDmaSupported = TRUE;
DEBUG ((DEBUG_INFO, "QemuFwCfg interface (DMA) is supported.\n"));
//
// If SEV is enabled then we do not support DMA operations in PEI phase.
// This is mainly because DMA in SEV guest requires using bounce buffer
// (which need to allocate dynamic memory and allocating a PAGE size'd
// buffer can be challenge in PEI phase)
//
if (InternalQemuFwCfgSevIsEnabled ()) {
DEBUG ((DEBUG_INFO, "SEV: QemuFwCfg fallback to IO Port interface.\n"));
} else {
mQemuFwCfgDmaSupported = TRUE;
DEBUG ((DEBUG_INFO, "QemuFwCfg interface (DMA) is supported.\n"));
}
}
return RETURN_SUCCESS;
}
@ -114,3 +127,58 @@ InternalQemuFwCfgDmaIsAvailable (
{
return mQemuFwCfgDmaSupported;
}
/**
Returns a boolean indicating whether SEV is enabled
@retval TRUE SEV is enabled
@retval FALSE SEV is disabled
**/
BOOLEAN
InternalQemuFwCfgSevIsEnabled (
VOID
)
{
return MemEncryptSevIsEnabled ();
}
/**
Allocate a bounce buffer for SEV DMA.
@param[in] NumPage Number of pages.
@param[out] Buffer Allocated DMA Buffer pointer
**/
VOID
InternalQemuFwCfgSevDmaAllocateBuffer (
OUT VOID **Buffer,
IN UINT32 NumPages
)
{
//
// We should never reach here
//
ASSERT (FALSE);
CpuDeadLoop ();
}
/**
Free the DMA buffer allocated using InternalQemuFwCfgSevDmaAllocateBuffer
@param[in] NumPage Number of pages.
@param[in] Buffer DMA Buffer pointer
**/
VOID
InternalQemuFwCfgSevDmaFreeBuffer (
IN VOID *Buffer,
IN UINT32 NumPages
)
{
//
// We should never reach here
//
ASSERT (FALSE);
CpuDeadLoop ();
}

1
OvmfPkg/Library/QemuFwCfgLib/QemuFwCfgPeiLib.inf
View File

@ -47,4 +47,5 @@
DebugLib
IoLib
MemoryAllocationLib
MemEncryptSevLib