From: "Min Xu" <min.m.xu@intel.com>
To: devel@edk2.groups.io
Cc: Min Xu <min.m.xu@intel.com>,
Ard Biesheuvel <ardb+tianocore@kernel.org>,
Jordan Justen <jordan.l.justen@intel.com>,
Brijesh Singh <brijesh.singh@amd.com>,
Erdem Aktas <erdemaktas@google.com>,
James Bottomley <jejb@linux.ibm.com>,
Jiewen Yao <jiewen.yao@intel.com>,
Tom Lendacky <thomas.lendacky@amd.com>,
Gerd Hoffmann <kraxel@redhat.com>
Subject: [PATCH V6 29/42] OvmfPkg: Check Tdx in QemuFwCfgPei to avoid DMA operation
Date: Sat, 19 Feb 2022 19:56:42 +0800 [thread overview]
Message-ID: <c1814d68c3f57da7163693c187119d6d07c3b710.1645261991.git.min.m.xu@intel.com> (raw)
In-Reply-To: <cover.1645261990.git.min.m.xu@intel.com>
RFC: https://bugzilla.tianocore.org/show_bug.cgi?id=3429
If TDX is enabled then we do not support DMA operation in PEI phase.
This is mainly because DMA in TDX guest requires using bounce buffer
(which need to allocate dynamic memory and allocating a PAGE size'd
buffer can be challenge in PEI phase).
Cc: Ard Biesheuvel <ardb+tianocore@kernel.org>
Cc: Jordan Justen <jordan.l.justen@intel.com>
Cc: Brijesh Singh <brijesh.singh@amd.com>
Cc: Erdem Aktas <erdemaktas@google.com>
Cc: James Bottomley <jejb@linux.ibm.com>
Cc: Jiewen Yao <jiewen.yao@intel.com>
Cc: Tom Lendacky <thomas.lendacky@amd.com>
Cc: Gerd Hoffmann <kraxel@redhat.com>
Acked-by: Gerd Hoffmann <kraxel@redhat.com>
Signed-off-by: Min Xu <min.m.xu@intel.com>
---
.../QemuFwCfgLib/QemuFwCfgLibInternal.h | 11 +++++++
OvmfPkg/Library/QemuFwCfgLib/QemuFwCfgPei.c | 32 +++++++++++++++++++
.../Library/QemuFwCfgLib/QemuFwCfgPeiLib.inf | 2 ++
3 files changed, 45 insertions(+)
diff --git a/OvmfPkg/Library/QemuFwCfgLib/QemuFwCfgLibInternal.h b/OvmfPkg/Library/QemuFwCfgLib/QemuFwCfgLibInternal.h
index 0b77cad1c030..6f7beb6ac1c7 100644
--- a/OvmfPkg/Library/QemuFwCfgLib/QemuFwCfgLibInternal.h
+++ b/OvmfPkg/Library/QemuFwCfgLib/QemuFwCfgLibInternal.h
@@ -59,4 +59,15 @@ InternalQemuFwCfgDmaBytes (
IN UINT32 Control
);
+/**
+ Check if it is Tdx guest
+
+ @retval TRUE It is Tdx guest
+ @retval FALSE It is not Tdx guest
+**/
+BOOLEAN
+QemuFwCfgIsTdxGuest (
+ VOID
+ );
+
#endif
diff --git a/OvmfPkg/Library/QemuFwCfgLib/QemuFwCfgPei.c b/OvmfPkg/Library/QemuFwCfgLib/QemuFwCfgPei.c
index f696fb7cacaa..b8230613dcea 100644
--- a/OvmfPkg/Library/QemuFwCfgLib/QemuFwCfgPei.c
+++ b/OvmfPkg/Library/QemuFwCfgLib/QemuFwCfgPei.c
@@ -14,12 +14,30 @@
#include <Library/DebugLib.h>
#include <Library/QemuFwCfgLib.h>
#include <Library/MemEncryptSevLib.h>
+#include <WorkArea.h>
#include "QemuFwCfgLibInternal.h"
STATIC BOOLEAN mQemuFwCfgSupported = FALSE;
STATIC BOOLEAN mQemuFwCfgDmaSupported;
+/**
+ Check if it is Tdx guest
+
+ @retval TRUE It is Tdx guest
+ @retval FALSE It is not Tdx guest
+**/
+BOOLEAN
+QemuFwCfgIsTdxGuest (
+ VOID
+ )
+{
+ CONFIDENTIAL_COMPUTING_WORK_AREA_HEADER *CcWorkAreaHeader;
+
+ CcWorkAreaHeader = (CONFIDENTIAL_COMPUTING_WORK_AREA_HEADER *)FixedPcdGet32 (PcdOvmfWorkAreaBase);
+ return (CcWorkAreaHeader != NULL && CcWorkAreaHeader->GuestType == GUEST_TYPE_INTEL_TDX);
+}
+
/**
Returns a boolean indicating if the firmware configuration interface
is available or not.
@@ -81,6 +99,14 @@ QemuFwCfgInitialize (
//
if (MemEncryptSevIsEnabled ()) {
DEBUG ((DEBUG_INFO, "SEV: QemuFwCfg fallback to IO Port interface.\n"));
+ } else if (QemuFwCfgIsTdxGuest ()) {
+ //
+ // If TDX is enabled then we do not support DMA operations in PEI phase.
+ // This is mainly because DMA in TDX guest requires using bounce buffer
+ // (which need to allocate dynamic memory and allocating a PAGE size'd
+ // buffer can be challenge in PEI phase)
+ //
+ DEBUG ((DEBUG_INFO, "TDX: QemuFwCfg fallback to IO Port interface.\n"));
} else {
mQemuFwCfgDmaSupported = TRUE;
DEBUG ((DEBUG_INFO, "QemuFwCfg interface (DMA) is supported.\n"));
@@ -163,6 +189,12 @@ InternalQemuFwCfgDmaBytes (
//
ASSERT (!MemEncryptSevIsEnabled ());
+ //
+ // TDX does not support DMA operations in PEI stage, we should
+ // not have reached here.
+ //
+ ASSERT (!QemuFwCfgIsTdxGuest ());
+
Access.Control = SwapBytes32 (Control);
Access.Length = SwapBytes32 (Size);
Access.Address = SwapBytes64 ((UINTN)Buffer);
diff --git a/OvmfPkg/Library/QemuFwCfgLib/QemuFwCfgPeiLib.inf b/OvmfPkg/Library/QemuFwCfgLib/QemuFwCfgPeiLib.inf
index 9f9af7d03201..3910511880c9 100644
--- a/OvmfPkg/Library/QemuFwCfgLib/QemuFwCfgPeiLib.inf
+++ b/OvmfPkg/Library/QemuFwCfgLib/QemuFwCfgPeiLib.inf
@@ -43,3 +43,5 @@
MemoryAllocationLib
MemEncryptSevLib
+[Pcd]
+ gUefiOvmfPkgTokenSpaceGuid.PcdOvmfWorkAreaBase
--
2.29.2.windows.2
next prev parent reply other threads:[~2022-02-19 11:58 UTC|newest]
Thread overview: 62+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-02-19 11:56 [PATCH V6 00/42] Enable Intel TDX in OvmfPkg (Config-A) Min Xu
2022-02-19 11:56 ` [PATCH V6 01/42] MdePkg: Add Tdx.h Min Xu
2022-02-23 1:56 ` Min Xu
2022-02-19 11:56 ` [PATCH V6 02/42] MdePkg: Introduce basic Tdx functions in BaseLib Min Xu
2022-02-23 1:57 ` Min Xu
2022-02-19 11:56 ` [PATCH V6 03/42] MdePkg: Add TdxLib to wrap Tdx operations Min Xu
2022-02-23 1:58 ` Min Xu
2022-02-19 11:56 ` [PATCH V6 04/42] UefiCpuPkg: Extend VmgExitLibNull to handle #VE exception Min Xu
2022-02-23 2:00 ` Min Xu
2022-02-19 11:56 ` [PATCH V6 05/42] OvmfPkg: Extend VmgExitLib " Min Xu
2022-02-19 11:56 ` [PATCH V6 06/42] UefiCpuPkg/CpuExceptionHandler: Add base support for the " Min Xu
2022-02-23 2:02 ` Min Xu
2022-02-19 11:56 ` [PATCH V6 07/42] MdePkg: Add helper functions for Tdx guest in BaseIoLibIntrinsic Min Xu
2022-02-19 11:56 ` [PATCH V6 08/42] MdePkg: Support mmio " Min Xu
2022-02-19 11:56 ` [PATCH V6 09/42] MdePkg: Support IoFifo " Min Xu
2022-02-19 11:56 ` [PATCH V6 10/42] MdePkg: Support IoRead/IoWrite " Min Xu
2022-02-19 11:56 ` [PATCH V6 11/42] UefiCpuPkg: Support TDX in BaseXApicX2ApicLib Min Xu
2022-02-19 11:56 ` [PATCH V6 12/42] MdePkg: Add macro to check SEV / TDX guest Min Xu
2022-02-19 11:56 ` [PATCH V6 13/42] UefiCpuPkg: Enable Tdx support in MpInitLib Min Xu
2022-02-19 11:56 ` [PATCH V6 14/42] OvmfPkg: Add IntelTdx.h in OvmfPkg/Include/IndustryStandard Min Xu
2022-02-19 11:56 ` [PATCH V6 15/42] OvmfPkg: Add TdxMailboxLib Min Xu
2022-02-19 11:56 ` [PATCH V6 16/42] MdePkg: Add EFI_RESOURCE_ATTRIBUTE_ENCRYPTED in PiHob.h Min Xu
2022-02-19 11:56 ` [PATCH V6 17/42] OvmfPkg: Create initial version of PlatformInitLib Min Xu
2022-02-19 11:56 ` [PATCH V6 18/42] OvmfPkg/PlatformPei: Update Cmos functions with PlatformInitLib Min Xu
2022-02-22 13:00 ` Gerd Hoffmann
2022-02-22 23:37 ` Min Xu
2022-02-19 11:56 ` [PATCH V6 19/42] OvmfPkg/PlatformInitLib: Add hob functions Min Xu
2022-02-19 11:56 ` [PATCH V6 20/42] OvmfPkg/PlatformPei: Update hob functions PlatformInitLib Min Xu
2022-02-22 13:02 ` Gerd Hoffmann
2022-02-22 23:38 ` Min Xu
2022-02-19 11:56 ` [PATCH V6 21/42] OvmfPkg/PlatformInitLib: Add memory functions Min Xu
2022-02-19 11:56 ` [PATCH V6 22/42] OvmfPkg/PlatformPei: Update memory functions with PlatformInitLib Min Xu
2022-02-19 11:56 ` [PATCH V6 23/42] OvmfPkg/PlatformInitLib: Add platform functions Min Xu
2022-02-19 11:56 ` [PATCH V6 25/42] OvmfPkg: Update PlatformInitLib to process Tdx hoblist Min Xu
2022-02-22 13:08 ` Gerd Hoffmann
2022-02-19 11:56 ` [PATCH V6 26/42] OvmfPkg: Add null instance of PlatformInitLib Min Xu
2022-02-22 13:10 ` Gerd Hoffmann
2022-02-23 0:34 ` Min Xu
2022-02-23 9:26 ` [edk2-devel] " Gerd Hoffmann
2022-02-19 11:56 ` [PATCH V6 27/42] OvmfPkg/Sec: Declare local variable as volatile in SecCoreStartupWithStack Min Xu
2022-02-23 9:44 ` Gerd Hoffmann
2022-02-19 11:56 ` [PATCH V6 28/42] OvmfPkg: Update Sec to support Tdx Min Xu
2022-02-23 9:49 ` Gerd Hoffmann
2022-02-19 11:56 ` Min Xu [this message]
2022-02-19 11:56 ` [PATCH V6 30/42] MdeModulePkg: EFER should not be changed in TDX Min Xu
2022-02-19 11:56 ` [PATCH V6 31/42] MdeModulePkg: Add PcdTdxSharedBitMask Min Xu
2022-02-19 11:56 ` [PATCH V6 32/42] UefiCpuPkg: Update AddressEncMask in CpuPageTable Min Xu
2022-02-19 11:56 ` [PATCH V6 33/42] OvmfPkg: Update PlatformInitLib for Tdx guest to publish ram regions Min Xu
2022-02-23 10:07 ` Gerd Hoffmann
2022-02-23 10:49 ` [edk2-devel] " Yao, Jiewen
2022-02-23 11:52 ` Gerd Hoffmann
2022-02-19 11:56 ` [PATCH V6 34/42] OvmfPkg: Update PlatformPei to support Tdx guest Min Xu
2022-02-23 10:13 ` Gerd Hoffmann
2022-02-24 0:49 ` Min Xu
2022-02-19 11:56 ` [PATCH V6 35/42] OvmfPkg: Update AcpiPlatformDxe to alter MADT table Min Xu
2022-02-19 11:56 ` [PATCH V6 36/42] OvmfPkg/BaseMemEncryptTdxLib: Add TDX helper library Min Xu
2022-02-19 11:56 ` [PATCH V6 37/42] OvmfPkg: Add TdxDxe driver Min Xu
2022-02-19 11:56 ` [PATCH V6 38/42] OvmfPkg/QemuFwCfgLib: Support Tdx in QemuFwCfgDxe Min Xu
2022-02-19 11:56 ` [PATCH V6 39/42] OvmfPkg: Update IoMmuDxe to support TDX Min Xu
2022-02-19 11:56 ` [PATCH V6 40/42] OvmfPkg: Rename XenTimerDxe to LocalApicTimerDxe Min Xu
[not found] ` <8e422d975ef8373efdf6eed332a44b59d7ffa38e.1645261990.git.min.m.xu@intel.com>
2022-02-22 13:04 ` [PATCH V6 24/42] OvmfPkg/PlatformPei: Update platform functions with PlatformInitLib Gerd Hoffmann
2022-02-22 23:39 ` Min Xu
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