From nobody Fri Nov 29 05:50:03 2024 Delivered-To: importer@patchew.org Received-SPF: none (zoho.com: 198.145.21.10 is neither permitted nor denied by domain of lists.01.org) client-ip=198.145.21.10; envelope-from=edk2-devel-bounces@lists.01.org; helo=ml01.01.org; Authentication-Results: mx.zoho.com; dkim=fail spf=none (zoho.com: 198.145.21.10 is neither permitted nor denied by domain of lists.01.org) smtp.mailfrom=edk2-devel-bounces@lists.01.org; Return-Path: Received: from ml01.01.org (ml01.01.org [198.145.21.10]) by mx.zohomail.com with SMTPS id 1490130005956360.0888589354453; Tue, 21 Mar 2017 14:00:05 -0700 (PDT) Received: from [127.0.0.1] (localhost [IPv6:::1]) by ml01.01.org (Postfix) with ESMTP id C121280403; Tue, 21 Mar 2017 14:00:04 -0700 (PDT) Received: from mail-ot0-x243.google.com (mail-ot0-x243.google.com [IPv6:2607:f8b0:4003:c0f::243]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ml01.01.org (Postfix) with ESMTPS id F091F80380 for ; Tue, 21 Mar 2017 14:00:02 -0700 (PDT) Received: by mail-ot0-x243.google.com with SMTP id y88so642344ota.1 for ; Tue, 21 Mar 2017 14:00:02 -0700 (PDT) Received: from [127.0.1.1] ([165.204.77.1]) by smtp.gmail.com with ESMTPSA id k63sm9321688oia.35.2017.03.21.14.00.01 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Tue, 21 Mar 2017 14:00:01 -0700 (PDT) X-Original-To: edk2-devel@ml01.01.org DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:subject:to:cc:date:message-id:in-reply-to:references :user-agent:mime-version:content-transfer-encoding; bh=tIgw/P6bsU+YyZ6eaBqinBwlUfy5ZrVli/6wByl7zOo=; b=fceNXYAFq66ko/N3FdgpaW2FuEXp318bm7WG7L0pccDbQQkSVQhh49b+lvG5eigf0E kIPSXa52VjcGFoL6aVHL7o2YvTh6Dpa/1GZ6iEVzxR8Cxl5emvrqXwlijiACIiatcXCo /iGX43wY7ZPGQTLO/jmJ/TGAYkrAsw/8GISeyUUNl915wJQY0dDRO4q1wSMsjEFxDE0t P+Mro0z4U/BTg2coaYArCsaeklePZbow7bxqL/vkQymj0Psdq37vKWUgtQunr47zlC7r 0pWgGMS+Jooz4+oUikuKyV5ubYZ+r8UrXVGgOQ4aZ48aVuyOVSsLpUSLy2WymvQcndS5 9eFQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:subject:to:cc:date:message-id:in-reply-to :references:user-agent:mime-version:content-transfer-encoding; bh=tIgw/P6bsU+YyZ6eaBqinBwlUfy5ZrVli/6wByl7zOo=; b=ZfxY9qjmblIPS68hIvTzSIyWW5vlyA9CuqMe++2h48OMIa9AQ0GyOYPtpWaMiZp9S/ Oz6aK8GUgzHdSnSnw1Fuy93CjnJFdtH/w9FAESpFFafWxECzoRQsjLYX+zaVYWjO+Jtd VhxW6VCNQ12LnI3svOGjOqBz/8aEDJXF3E5oM3IhblZc+VFM/QI/9Zdyj+mDMzQZWir6 gzs3tL0eVyHRb4FNJHx+wNw8V/C27FYaFEYNsfUWXHpNuQaHdMQkdlKQEQRBdqBE4yVt BUNJ2GZZv5i3zkQ7IOC0eHfDRAh/4kvoX8au7fENNNBSf979am7z0wNnCqLYQGIMQEKF iCog== X-Gm-Message-State: AFeK/H2UnaWi0TbgKcUYR2BgnR/dW0M6n8j6/kbz9yck4gzUt6QBPMvmf91ji9qpnXTOpw== X-Received: by 10.157.32.202 with SMTP id x68mr21179203ota.53.1490130002085; Tue, 21 Mar 2017 14:00:02 -0700 (PDT) From: Brijesh Singh X-Google-Original-From: Brijesh Singh To: michael.d.kinney@intel.com, ersek@redhat.com, edk2-devel@ml01.01.org, liming.gao@intel.com, jordan.l.justen@intel.com Date: Tue, 21 Mar 2017 17:00:01 -0400 Message-ID: <149013000116.26803.4167012210500152279.stgit@brijesh-build-machine> In-Reply-To: <149012994545.26803.15256468111517327020.stgit@brijesh-build-machine> References: <149012994545.26803.15256468111517327020.stgit@brijesh-build-machine> User-Agent: StGit/0.17.1-dirty MIME-Version: 1.0 Subject: [edk2] [RFC PATCH v2 09/10] OvmfPkg/QemuFwCfgLib: Add Secure Encrypted Virtualization (SEV) support X-BeenThere: edk2-devel@lists.01.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: EDK II Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: brijesh.singh@amd.com, leo.duran@amd.com, Thomas.Lendacky@amd.com Content-Transfer-Encoding: quoted-printable Errors-To: edk2-devel-bounces@lists.01.org Sender: "edk2-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) X-ZohoMail: RSF_4 Z_629925259 SPT_0 Content-Type: text/plain; charset="utf-8" The patch adds SEV support in QemuFwCfgLib. When SEV is enabled: * Pei phase support IO-style operations. This is mainly because we need to use a bounce buffer inorder to support DMA operation. Allocate a memory for bounce buffer can get painful in Pei phase hence if we detect FWCfg = DMA support then silently fallback to IO. * Dxe phase supports both IO and DMA style operations. --- OvmfPkg/Library/QemuFwCfgLib/QemuFwCfgDxe.c | 73 +++++++++++++ OvmfPkg/Library/QemuFwCfgLib/QemuFwCfgDxeLib.inf | 2=20 OvmfPkg/Library/QemuFwCfgLib/QemuFwCfgLib.c | 112 ++++++++++++++++= ++++ .../Library/QemuFwCfgLib/QemuFwCfgLibInternal.h | 38 +++++++ OvmfPkg/Library/QemuFwCfgLib/QemuFwCfgPei.c | 93 +++++++++++++++++ OvmfPkg/Library/QemuFwCfgLib/QemuFwCfgPeiLib.inf | 2=20 OvmfPkg/Library/QemuFwCfgLib/QemuFwCfgSec.c | 82 +++++++++++++++ 7 files changed, 402 insertions(+) diff --git a/OvmfPkg/Library/QemuFwCfgLib/QemuFwCfgDxe.c b/OvmfPkg/Library/= QemuFwCfgLib/QemuFwCfgDxe.c index ac05f4c..be8e945 100644 --- a/OvmfPkg/Library/QemuFwCfgLib/QemuFwCfgDxe.c +++ b/OvmfPkg/Library/QemuFwCfgLib/QemuFwCfgDxe.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 @@ -14,14 +15,34 @@ WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. **/ =20 +#include "Uefi.h" + +#include #include #include +#include +#include +#include =20 #include "QemuFwCfgLibInternal.h" =20 STATIC BOOLEAN mQemuFwCfgSupported =3D FALSE; STATIC BOOLEAN mQemuFwCfgDmaSupported; +STATIC BOOLEAN mQemuFwCfgSevIsEnabled =3D FALSE; + +/** + Returns a boolean indicating whether the SEV is enabled =20 + @retval TRUE SEV is enabled + @retval FALSE SEV is not enabled +**/ +BOOLEAN +InternalQemuFwCfgSevIsEnabled ( + VOID + ) +{ + return mQemuFwCfgSevIsEnabled; +} =20 /** Returns a boolean indicating if the firmware configuration interface @@ -79,6 +100,9 @@ QemuFwCfgInitialize ( mQemuFwCfgDmaSupported =3D TRUE; DEBUG ((DEBUG_INFO, "QemuFwCfg interface (DMA) is supported.\n")); } + + mQemuFwCfgSevIsEnabled =3D MemEncryptSevIsEnabled (); + return RETURN_SUCCESS; } =20 @@ -114,3 +138,52 @@ InternalQemuFwCfgDmaIsAvailable ( { return mQemuFwCfgDmaSupported; } + +/** + Allocate a bounce buffer for SEV DMA. + + @param[in] NumPage Number of pages. + @param[out] Buffer Allocated DMA Buffer pointer + +**/ +VOID +InternalQemuFwCfgSevDmaAllocateBuffer ( + IN UINT32 NumPages, + OUT VOID **Buffer + ) +{ + EFI_STATUS Status; + + // + // Allocate DMA bounce buffer + // + Status =3D BmDmaAllocateBuffer (TRUE, EfiBootServicesData, NumPages, Buf= fer); + if (EFI_ERROR(Status)) { + DEBUG ((EFI_D_ERROR, "SEV: Failed to allocate bounce buffer %d pages\n= ", NumPages)); + ASSERT_EFI_ERROR (Status); + CpuDeadLoop (); + } + + DEBUG ((EFI_D_VERBOSE, "QemuFwCfgSevDma allocate buffer 0x%Lx Pages %d\n= ", (UINTN)Buffer, NumPages)); +} + +/** + 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 + ) +{ + // + // Free the bounce buffer + // + DEBUG ((EFI_D_VERBOSE, "QemuFwCfgSevDma free buffer 0x%Lx Pages %d\n", (= UINTN)Buffer, NumPages)); + BmDmaFreeBuffer (Buffer, NumPages); +} + diff --git a/OvmfPkg/Library/QemuFwCfgLib/QemuFwCfgDxeLib.inf b/OvmfPkg/Lib= rary/QemuFwCfgLib/QemuFwCfgDxeLib.inf index 346bb88..536887f 100644 --- a/OvmfPkg/Library/QemuFwCfgLib/QemuFwCfgDxeLib.inf +++ b/OvmfPkg/Library/QemuFwCfgLib/QemuFwCfgDxeLib.inf @@ -47,4 +47,6 @@ DebugLib IoLib MemoryAllocationLib + MemEncryptSevLib + BmDmaLib =20 diff --git a/OvmfPkg/Library/QemuFwCfgLib/QemuFwCfgLib.c b/OvmfPkg/Library/= QemuFwCfgLib/QemuFwCfgLib.c index 1bf725d..d2560a3 100644 --- a/OvmfPkg/Library/QemuFwCfgLib/QemuFwCfgLib.c +++ b/OvmfPkg/Library/QemuFwCfgLib/QemuFwCfgLib.c @@ -47,6 +47,111 @@ QemuFwCfgSelectItem ( =20 =20 /** + Transfer an array of bytes, or skip a number of bytes, using the SEV DMA= bounce + interface. The function is same as InternalQemuFwCfgDmaBytes with excpet= ion that + it uses bounce buffer + + @param[in] Size Size in bytes to transfer or skip. + + @param[in,out] HostBuffer Buffer to read data into or write data from. I= gnored, + and may be NULL, if Size is zero, or Control is + FW_CFG_DMA_CTL_SKIP. + + @param[in] Control One of the following: + FW_CFG_DMA_CTL_WRITE - write to fw_cfg from Buff= er. + FW_CFG_DMA_CTL_READ - read from fw_cfg into Buf= fer. + FW_CFG_DMA_CTL_SKIP - skip bytes in fw_cfg. +**/ +VOID +InternalQemuFwCfgSevDmaBytes ( + IN UINT32 Size, + IN OUT VOID *HostBuffer OPTIONAL, + IN UINT32 Control + ) +{ + volatile FW_CFG_DMA_ACCESS *Access; + UINT32 AccessHigh, AccessLow; + UINT32 Status; + UINT32 NumPages; + VOID *DmaBuffer, *Buffer; + + // + // Calculate number of pages we need to allocate for this operation + // + if (Control =3D=3D FW_CFG_DMA_CTL_SKIP) { + // + // Control data does not need the actual buffer + // + NumPages =3D EFI_SIZE_TO_PAGES (sizeof (*Access)); + } else { + NumPages =3D EFI_SIZE_TO_PAGES (sizeof (*Access) + Size); + } + + // + // Allocate DMA bounce buffer + // + InternalQemuFwCfgSevDmaAllocateBuffer (NumPages, &DmaBuffer); + + Access =3D (FW_CFG_DMA_ACCESS *)DmaBuffer; + Buffer =3D DmaBuffer + sizeof(*Access); + + Access->Control =3D SwapBytes32 (Control); + Access->Length =3D SwapBytes32 (Size); + Access->Address =3D SwapBytes64 ((UINTN)Buffer); + + // + // Copy data from Host buffer into DMA buffer + // + if (HostBuffer && (Control =3D=3D FW_CFG_DMA_CTL_WRITE)) { + CopyMem (Buffer, HostBuffer, Size); + } + + // + // Delimit the transfer from (a) modifications to Access, (b) in case of= a + // write, from writes to Buffer by the caller. + // + MemoryFence (); + + // + // Start the transfer. + // + AccessHigh =3D (UINT32)RShiftU64 ((UINTN)Access, 32); + AccessLow =3D (UINT32)(UINTN)Access; + IoWrite32 (FW_CFG_IO_DMA_ADDRESS, SwapBytes32 (AccessHigh)); + IoWrite32 (FW_CFG_IO_DMA_ADDRESS + 4, SwapBytes32 (AccessLow)); + + // + // Don't look at Access->Control before starting the transfer. + // + MemoryFence (); + + // + // Wait for the transfer to complete. + // + do { + Status =3D SwapBytes32 (Access->Control); + ASSERT ((Status & FW_CFG_DMA_CTL_ERROR) =3D=3D 0); + } while (Status !=3D 0); + + // + // After a read, the caller will want to use Buffer. + // + MemoryFence (); + + // + // Copy data from DMA buffer into Host Buffer + // + if (HostBuffer && (Control =3D=3D FW_CFG_DMA_CTL_READ)) { + CopyMem (HostBuffer, Buffer, Size); + } + + // + // Free the DMA bounce buffer + // + InternalQemuFwCfgSevDmaFreeBuffer (DmaBuffer, NumPages); +} + +/** Transfer an array of bytes, or skip a number of bytes, using the DMA interface. =20 @@ -79,6 +184,13 @@ InternalQemuFwCfgDmaBytes ( return; } =20 + // + // When SEV is enabled then use SEV version of DmaReadWrite + // + if (InternalQemuFwCfgSevIsEnabled ()) { + return InternalQemuFwCfgSevDmaBytes (Size, Buffer, Control); + } + Access.Control =3D SwapBytes32 (Control); Access.Length =3D SwapBytes32 (Size); Access.Address =3D SwapBytes64 ((UINTN)Buffer); diff --git a/OvmfPkg/Library/QemuFwCfgLib/QemuFwCfgLibInternal.h b/OvmfPkg/= Library/QemuFwCfgLib/QemuFwCfgLibInternal.h index 6e87c62..8e2ff45 100644 --- a/OvmfPkg/Library/QemuFwCfgLib/QemuFwCfgLibInternal.h +++ b/OvmfPkg/Library/QemuFwCfgLib/QemuFwCfgLibInternal.h @@ -2,6 +2,7 @@ Internal interfaces specific to the QemuFwCfgLib instances in OvmfPkg. =20 Copyright (C) 2016, Red Hat, Inc. + Copyright (C) 2017, Advanced Micro Devices. =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 @@ -43,4 +44,41 @@ InternalQemuFwCfgDmaIsAvailable ( VOID ); =20 +/** + Returns a boolean indicating whether the SEV is enabled + + @retval TRUE SEV is enabled + @retval FALSE SEV is not enabled +**/ +BOOLEAN +InternalQemuFwCfgSevIsEnabled ( + VOID + ); + +/** + Allocate a bounce buffer for SEV DMA. + + @param[in] NumPage Number of pages. + @param[out] Buffer Allocated DMA Buffer pointer + +**/ +VOID +InternalQemuFwCfgSevDmaAllocateBuffer ( + IN UINT32 NumPages, + OUT VOID **Buffer + ); + +/** + 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 + ); + #endif diff --git a/OvmfPkg/Library/QemuFwCfgLib/QemuFwCfgPei.c b/OvmfPkg/Library/= QemuFwCfgLib/QemuFwCfgPei.c index ac05f4c..3dc9270 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 @@ -14,14 +15,55 @@ WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. **/ =20 +#include #include #include +#include +#include =20 #include "QemuFwCfgLibInternal.h" =20 STATIC BOOLEAN mQemuFwCfgSupported =3D FALSE; STATIC BOOLEAN mQemuFwCfgDmaSupported; =20 +/** + Returns a boolean indicating whether the SEV is enabled + + @retval TRUE SEV is enabled + @retval FALSE SEV is not enabled +**/ +BOOLEAN +InternalQemuFwCfgSevIsEnabled ( + VOID + ) +{ + UINT32 RegEax; + MSR_SEV_STATUS_REGISTER Msr; + CPUID_MEMORY_ENCRYPTION_INFO_EAX Eax; + + // + // Check if memory encryption leaf exist + // + AsmCpuid (CPUID_EXTENDED_FUNCTION, &RegEax, NULL, NULL, NULL); + if (RegEax >=3D CPUID_MEMORY_ENCRYPTION_INFO) { + // + // CPUID Fn8000_001F[EAX] Bit 1 (Sev supported) + // + AsmCpuid (CPUID_MEMORY_ENCRYPTION_INFO, &Eax.Uint32, NULL, NULL, NULL); + + if (Eax.Bits.SevBit) { + // + // Check MSR_0xC0010131 Bit 0 (Sev Enabled) + // + Msr.Uint32 =3D AsmReadMsr32 (MSR_SEV_STATUS); + if (Msr.Bits.SevBit) { + return TRUE; + } + } + } + + return FALSE; +} =20 /** Returns a boolean indicating if the firmware configuration interface @@ -79,6 +121,17 @@ QemuFwCfgInitialize ( mQemuFwCfgDmaSupported =3D TRUE; DEBUG ((DEBUG_INFO, "QemuFwCfg interface (DMA) is supported.\n")); } + + // + // When SEV is enabled then we do not support DMA interface. + // This is because we need to use bounce buffer to support DMA operation= in SEV guest. + // Allocating memory for bounce buffer can get painful in Pei phase + // + if (mQemuFwCfgDmaSupported && InternalQemuFwCfgSevIsEnabled ()) { + mQemuFwCfgDmaSupported =3D FALSE; + DEBUG ((DEBUG_INFO, "QemuFwCfg disabling DMA interface and defaulting = to IO Port.\n")); + } + return RETURN_SUCCESS; } =20 @@ -114,3 +167,43 @@ InternalQemuFwCfgDmaIsAvailable ( { return mQemuFwCfgDmaSupported; } + +/** + Allocate a bounce buffer for SEV DMA. + + @param[in] NumPage Number of pages. + @param[out] Buffer Allocated DMA Buffer pointer + +**/ +VOID +InternalQemuFwCfgSevDmaAllocateBuffer ( + IN UINT32 NumPages, + OUT VOID **Buffer + ) +{ + // + // 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 (); +} diff --git a/OvmfPkg/Library/QemuFwCfgLib/QemuFwCfgPeiLib.inf b/OvmfPkg/Lib= rary/QemuFwCfgLib/QemuFwCfgPeiLib.inf index 4f966a8..83cc0de 100644 --- a/OvmfPkg/Library/QemuFwCfgLib/QemuFwCfgPeiLib.inf +++ b/OvmfPkg/Library/QemuFwCfgLib/QemuFwCfgPeiLib.inf @@ -39,7 +39,9 @@ =20 [Packages] MdePkg/MdePkg.dec + MdeModulePkg/MdeModulePkg.dec OvmfPkg/OvmfPkg.dec + UefiCpuPkg/UefiCpuPkg.dec =20 [LibraryClasses] BaseLib diff --git a/OvmfPkg/Library/QemuFwCfgLib/QemuFwCfgSec.c b/OvmfPkg/Library/= QemuFwCfgLib/QemuFwCfgSec.c index 465ccbe..70b0a47 100644 --- a/OvmfPkg/Library/QemuFwCfgLib/QemuFwCfgSec.c +++ b/OvmfPkg/Library/QemuFwCfgLib/QemuFwCfgSec.c @@ -16,8 +16,11 @@ WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. **/ =20 +#include #include #include +#include +#include =20 #include "QemuFwCfgLibInternal.h" =20 @@ -94,3 +97,82 @@ InternalQemuFwCfgDmaIsAvailable ( { return FALSE; } + +/** + Returns a boolean indicating whether the SEV is enabled + + @retval TRUE SEV is enabled + @retval FALSE SEV is not enabled +**/ +BOOLEAN +InternalQemuFwCfgSevIsEnabled ( + VOID + ) +{ + UINT32 RegEax; + MSR_SEV_STATUS_REGISTER Msr; + CPUID_MEMORY_ENCRYPTION_INFO_EAX Eax; + + // + // Check if memory encryption leaf exist + // + AsmCpuid (CPUID_EXTENDED_FUNCTION, &RegEax, NULL, NULL, NULL); + if (RegEax >=3D CPUID_MEMORY_ENCRYPTION_INFO) { + // + // CPUID Fn8000_001F[EAX] Bit 1 (Sev supported) + // + AsmCpuid (CPUID_MEMORY_ENCRYPTION_INFO, &Eax.Uint32, NULL, NULL, NULL); + + if (Eax.Bits.SevBit) { + // + // Check MSR_0xC0010131 Bit 0 (Sev Enabled) + // + Msr.Uint32 =3D AsmReadMsr32 (MSR_SEV_STATUS); + if (Msr.Bits.SevBit) { + return TRUE; + } + } + } + + return FALSE; +} + +/** + Allocate a bounce buffer for SEV DMA. + + @param[in] NumPage Number of pages. + @param[out] Buffer Allocated DMA Buffer pointer + +**/ +VOID +InternalQemuFwCfgSevDmaAllocateBuffer ( + IN UINT32 NumPages, + OUT VOID **Buffer + ) +{ + // + // 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 (); +} _______________________________________________ edk2-devel mailing list edk2-devel@lists.01.org https://lists.01.org/mailman/listinfo/edk2-devel