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charset="utf-8" Cc: Jordan Justen Cc: Laszlo Ersek Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Brijesh Singh Reviewed-by: Laszlo Ersek Reviewed-by: Jordan Justen --- OvmfPkg/Library/QemuFwCfgLib/QemuFwCfgPeiLib.inf | 1 + OvmfPkg/Library/QemuFwCfgLib/QemuFwCfgPei.c | 72 +++++++++++++++++++- 2 files changed, 71 insertions(+), 2 deletions(-) diff --git a/OvmfPkg/Library/QemuFwCfgLib/QemuFwCfgPeiLib.inf b/OvmfPkg/Lib= rary/QemuFwCfgLib/QemuFwCfgPeiLib.inf index 47e23b97eccf..7e51c3f160ac 100644 --- a/OvmfPkg/Library/QemuFwCfgLib/QemuFwCfgPeiLib.inf +++ b/OvmfPkg/Library/QemuFwCfgLib/QemuFwCfgPeiLib.inf @@ -47,4 +47,5 @@ [LibraryClasses] DebugLib IoLib MemoryAllocationLib + MemEncryptSevLib =20 diff --git a/OvmfPkg/Library/QemuFwCfgLib/QemuFwCfgPei.c b/OvmfPkg/Library/= QemuFwCfgLib/QemuFwCfgPei.c index ac05f4c347f3..40f89c3b53e2 100644 --- a/OvmfPkg/Library/QemuFwCfgLib/QemuFwCfgPei.c +++ b/OvmfPkg/Library/QemuFwCfgLib/QemuFwCfgPei.c @@ -4,6 +4,7 @@ =20 Copyright (C) 2013, Red Hat, Inc. Copyright (c) 2011 - 2013, Intel Corporation. All rights reserved.
+ Copyright (c) 2017, Advanced Micro Devices. All rights reserved.
=20 This program and the accompanying materials are licensed and made availa= ble 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. **/ =20 +#include #include #include +#include =20 #include "QemuFwCfgLibInternal.h" =20 @@ -76,8 +79,18 @@ QemuFwCfgInitialize ( if ((Revision & FW_CFG_F_DMA) =3D=3D 0) { DEBUG ((DEBUG_INFO, "QemuFwCfg interface (IO Port) is supported.\n")); } else { - mQemuFwCfgDmaSupported =3D TRUE; - DEBUG ((DEBUG_INFO, "QemuFwCfg interface (DMA) is supported.\n")); + // + // If SEV is enabled then we do not support DMA operations in PEI phas= e. + // 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 =3D 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 (); +} --=20 2.7.4 _______________________________________________ edk2-devel mailing list edk2-devel@lists.01.org https://lists.01.org/mailman/listinfo/edk2-devel