2010-02-24 00:58:38 +01:00
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## @file
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2009-05-27 23:10:18 +02:00
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# EFI/Framework Open Virtual Machine Firmware (OVMF) platform
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#
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2013-11-12 19:34:11 +01:00
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# Copyright (c) 2006 - 2013, Intel Corporation. All rights reserved.<BR>
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2009-05-27 23:10:18 +02:00
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#
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2010-04-28 14:43:04 +02:00
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# This program and the accompanying materials
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2009-05-27 23:10:18 +02:00
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# are licensed and made available under the terms and conditions of the BSD License
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# which accompanies this distribution. The full text of the license may be found at
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# http://opensource.org/licenses/bsd-license.php
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2012-09-12 09:18:21 +02:00
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#
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2009-05-27 23:10:18 +02:00
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# THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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# WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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#
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2010-02-24 00:58:38 +01:00
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##
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2009-05-27 23:10:18 +02:00
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[Defines]
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2011-06-28 04:24:46 +02:00
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DEC_SPECIFICATION = 0x00010005
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2009-05-27 23:10:18 +02:00
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PACKAGE_NAME = OvmfPkg
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PACKAGE_GUID = 2daf5f34-50e5-4b9d-b8e3-5562334d87e5
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PACKAGE_VERSION = 0.1
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2009-09-16 18:28:55 +02:00
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[Includes]
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Include
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Clean up DEC files:
1) Remove section header comment blocks that do not provide any information
2) Combine PCDs listed in multiple sections into a single section that supports multiple PCD types to reduce maintenance overhead
3) Remove ModuleTypeList comments from [Includes], [Protocols], [Ppis], and [Guids] sections that do not properly describe the module type restrictions.
4) Clean up formatting of GUID structure declarations
5) Remove ".common" from section names if they are not required.
6) Order sections consistently as [Defines], [Includes], [LibraryClasses], [Guid], [Ppis], [Protocols], [PcdsFeatureFlag], [PcdsFixedAtBuild], [PcdsPatchableInModule], [PcdsDynamic], and [PcdsDynamicEx]
git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@11633 6f19259b-4bc3-4df7-8a09-765794883524
2011-05-09 19:50:40 +02:00
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[LibraryClasses]
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2012-11-02 19:26:48 +01:00
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## @libraryclass Loads and boots a Linux kernel image
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#
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LoadLinuxLib|Include/Library/LoadLinuxLib.h
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Clean up DEC files:
1) Remove section header comment blocks that do not provide any information
2) Combine PCDs listed in multiple sections into a single section that supports multiple PCD types to reduce maintenance overhead
3) Remove ModuleTypeList comments from [Includes], [Protocols], [Ppis], and [Guids] sections that do not properly describe the module type restrictions.
4) Clean up formatting of GUID structure declarations
5) Remove ".common" from section names if they are not required.
6) Order sections consistently as [Defines], [Includes], [LibraryClasses], [Guid], [Ppis], [Protocols], [PcdsFeatureFlag], [PcdsFixedAtBuild], [PcdsPatchableInModule], [PcdsDynamic], and [PcdsDynamicEx]
git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@11633 6f19259b-4bc3-4df7-8a09-765794883524
2011-05-09 19:50:40 +02:00
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## @libraryclass Save and restore variables using a file
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#
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NvVarsFileLib|Include/Library/NvVarsFileLib.h
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2012-05-31 01:14:38 +02:00
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## @libraryclass Access QEMU's firmware configuration interface
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#
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QemuFwCfgLib|Include/Library/QemuFwCfgLib.h
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2015-01-02 13:07:57 +01:00
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## @libraryclass Rewrite the BootOrder NvVar based on QEMU's "bootorder"
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# fw_cfg file.
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#
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QemuBootOrderLib|Include/Library/QemuBootOrderLib.h
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Clean up DEC files:
1) Remove section header comment blocks that do not provide any information
2) Combine PCDs listed in multiple sections into a single section that supports multiple PCD types to reduce maintenance overhead
3) Remove ModuleTypeList comments from [Includes], [Protocols], [Ppis], and [Guids] sections that do not properly describe the module type restrictions.
4) Clean up formatting of GUID structure declarations
5) Remove ".common" from section names if they are not required.
6) Order sections consistently as [Defines], [Includes], [LibraryClasses], [Guid], [Ppis], [Protocols], [PcdsFeatureFlag], [PcdsFixedAtBuild], [PcdsPatchableInModule], [PcdsDynamic], and [PcdsDynamicEx]
git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@11633 6f19259b-4bc3-4df7-8a09-765794883524
2011-05-09 19:50:40 +02:00
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## @libraryclass Serialize (and deserialize) variables
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#
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SerializeVariablesLib|Include/Library/SerializeVariablesLib.h
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2015-02-28 21:32:39 +01:00
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## @libraryclass Invoke Xen hypercalls
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#
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XenHypercallLib|Include/Library/XenHypercallLib.h
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2015-02-28 21:34:16 +01:00
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## @libraryclass Manage XenBus device path and I/O handles
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#
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XenIoMmioLib|Include/Library/XenIoMmioLib.h
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2010-02-24 00:58:38 +01:00
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[Guids]
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2009-05-27 23:10:18 +02:00
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gUefiOvmfPkgTokenSpaceGuid = {0x93bb96af, 0xb9f2, 0x4eb8, {0x94, 0x62, 0xe0, 0xba, 0x74, 0x56, 0x42, 0x36}}
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2011-07-30 01:59:12 +02:00
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gEfiXenInfoGuid = {0xd3b46f3b, 0xd441, 0x1244, {0x9a, 0x12, 0x0, 0x12, 0x27, 0x3f, 0xc1, 0x4d}}
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2014-03-22 08:12:46 +01:00
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gOvmfPlatformConfigGuid = {0x7235c51c, 0x0c80, 0x4cab, {0x87, 0xac, 0x3b, 0x08, 0x4a, 0x63, 0x04, 0xb1}}
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2015-01-02 13:08:06 +01:00
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gVirtioMmioTransportGuid = {0x837dca9e, 0xe874, 0x4d82, {0xb2, 0x9a, 0x23, 0xfe, 0x0e, 0x23, 0xd1, 0xe2}}
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2015-02-28 21:34:06 +01:00
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gXenBusRootDeviceGuid = {0xa732241f, 0x383d, 0x4d9c, {0x8a, 0xe1, 0x8e, 0x09, 0x83, 0x75, 0x89, 0xd7}}
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2009-05-27 23:10:18 +02:00
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2010-03-21 01:33:59 +01:00
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[Protocols]
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2013-12-11 17:57:40 +01:00
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gVirtioDeviceProtocolGuid = {0xfa920010, 0x6785, 0x4941, {0xb6, 0xec, 0x49, 0x8c, 0x57, 0x9f, 0x16, 0x0a}}
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2010-03-21 01:33:59 +01:00
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gBlockMmioProtocolGuid = {0x6b558ce3, 0x69e5, 0x4c67, {0xa6, 0x34, 0xf7, 0xfe, 0x72, 0xad, 0xbe, 0x84}}
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2014-10-29 07:49:38 +01:00
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gXenBusProtocolGuid = {0x3d3ca290, 0xb9a5, 0x11e3, {0xb7, 0x5d, 0xb8, 0xac, 0x6f, 0x7d, 0x65, 0xe6}}
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2015-02-28 21:32:50 +01:00
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gXenIoProtocolGuid = {0x6efac84f, 0x0ab0, 0x4747, {0x81, 0xbe, 0x85, 0x55, 0x62, 0x59, 0x04, 0x49}}
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2010-03-21 01:33:59 +01:00
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2009-09-26 09:15:48 +02:00
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[PcdsFixedAtBuild]
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2014-01-21 20:39:13 +01:00
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gUefiOvmfPkgTokenSpaceGuid.PcdOvmfPeiMemFvBase|0x0|UINT32|0
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gUefiOvmfPkgTokenSpaceGuid.PcdOvmfPeiMemFvSize|0x0|UINT32|1
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gUefiOvmfPkgTokenSpaceGuid.PcdOvmfDxeMemFvBase|0x0|UINT32|0x15
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gUefiOvmfPkgTokenSpaceGuid.PcdOvmfDxeMemFvSize|0x0|UINT32|0x16
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2009-09-26 09:15:48 +02:00
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2012-07-26 18:36:39 +02:00
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## This flag is used to control the destination port for PlatformDebugLibIoPort
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gUefiOvmfPkgTokenSpaceGuid.PcdDebugIoPort|0x402|UINT16|4
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2012-09-12 09:18:35 +02:00
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## This flag determines the Power Management Base Address of choice, written
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# to PIIX4 function 3 offset 0x40-0x43 bits [15:6].
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gUefiOvmfPkgTokenSpaceGuid.PcdAcpiPmBaseAddress|0xB000|UINT16|5
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2012-10-18 19:07:48 +02:00
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## When VirtioScsiDxe is instantiated for a HBA, the numbers of targets and
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# LUNs are retrieved from the host during virtio-scsi setup.
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# MdeModulePkg/Bus/Scsi/ScsiBusDxe then scans all MaxTarget * MaxLun
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# possible devices. This can take extremely long, for example with
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# MaxTarget=255 and MaxLun=16383. The *inclusive* constants below limit
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# MaxTarget and MaxLun, independently, should the host report higher values,
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# so that scanning the number of devices given by their product is still
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# acceptably fast.
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gUefiOvmfPkgTokenSpaceGuid.PcdVirtioScsiMaxTargetLimit|31|UINT16|6
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gUefiOvmfPkgTokenSpaceGuid.PcdVirtioScsiMaxLunLimit|7|UINT32|7
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OvmfPkg: PlatformPei: account for TSEG size with PcdSmmSmramRequire set
PlatformPei calls GetSystemMemorySizeBelow4gb() in three locations:
- PublishPeiMemory(): on normal boot, the permanent PEI RAM is installed
so that it ends with the RAM below 4GB,
- QemuInitializeRam(): on normal boot, memory resource descriptor HOBs are
created for the RAM below 4GB; plus MTRR attributes are set
(independently of S3 vs. normal boot)
- MemMapInitialization(): an MMIO resource descriptor HOB is created for
PCI resource allocation, on normal boot, starting at max(RAM below 4GB,
2GB).
The first two of these is adjusted for the configured TSEG size, if
PcdSmmSmramRequire is set:
- In PublishPeiMemory(), the permanent PEI RAM is kept under TSEG.
- In QemuInitializeRam(), we must keep the DXE out of TSEG.
One idea would be to simply trim the [1MB .. LowerMemorySize] memory
resource descriptor HOB, leaving a hole for TSEG in the memory space
map.
The SMM IPL will however want to massage the caching attributes of the
SMRAM range that it loads the SMM core into, with
gDS->SetMemorySpaceAttributes(), and that won't work on a hole. So,
instead of trimming this range, split the TSEG area off, and report it
as a cacheable reserved memory resource.
Finally, since reserved memory can be allocated too, pre-allocate TSEG
in InitializeRamRegions(), after QemuInitializeRam() returns. (Note that
this step alone does not suffice without the resource descriptor HOB
trickery: if we omit that, then the DXE IPL PEIM fails to load and start
the DXE core.)
- In MemMapInitialization(), the start of the PCI MMIO range is not
affected.
We choose the largest option (8MB) for the default TSEG size. Michael
Kinney pointed out that the SMBASE relocation in PiSmmCpuDxeSmm consumes
SMRAM proportionally to the number of CPUs. From the three options
available, he reported that 8MB was both necessary and sufficient for the
SMBASE relocation to succeed with 255 CPUs:
- http://thread.gmane.org/gmane.comp.bios.edk2.devel/3020/focus=3137
- http://thread.gmane.org/gmane.comp.bios.edk2.devel/3020/focus=3177
Cc: Michael Kinney <michael.d.kinney@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Laszlo Ersek <lersek@redhat.com>
Reviewed-by: Jordan Justen <jordan.l.justen@intel.com>
Reviewed-by: Michael Kinney <michael.d.kinney@intel.com>
git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@19039 6f19259b-4bc3-4df7-8a09-765794883524
2015-11-30 19:41:33 +01:00
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## The following setting controls how many megabytes we configure as TSEG on
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# Q35, for SMRAM purposes. Permitted values are: 1, 2, 8. Other values cause
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# undefined behavior.
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#
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# This PCD is only consulted if PcdSmmSmramRequire is TRUE (see below).
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gUefiOvmfPkgTokenSpaceGuid.PcdQ35TsegMbytes|8|UINT8|0x20
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2013-11-12 19:34:11 +01:00
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[PcdsFixedAtBuild]
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gUefiOvmfPkgTokenSpaceGuid.PcdOvmfFlashNvStorageEventLogBase|0x0|UINT32|0x8
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gUefiOvmfPkgTokenSpaceGuid.PcdOvmfFlashNvStorageEventLogSize|0x0|UINT32|0x9
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gUefiOvmfPkgTokenSpaceGuid.PcdOvmfFirmwareFdSize|0x0|UINT32|0xa
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gUefiOvmfPkgTokenSpaceGuid.PcdOvmfFirmwareBlockSize|0|UINT32|0xb
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gUefiOvmfPkgTokenSpaceGuid.PcdOvmfFlashNvStorageVariableBase|0x0|UINT32|0xc
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gUefiOvmfPkgTokenSpaceGuid.PcdOvmfFlashNvStorageFtwSpareBase|0x0|UINT32|0xd
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gUefiOvmfPkgTokenSpaceGuid.PcdOvmfFlashNvStorageFtwWorkingBase|0x0|UINT32|0xe
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gUefiOvmfPkgTokenSpaceGuid.PcdOvmfFdBaseAddress|0x0|UINT32|0xf
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2014-01-21 20:38:34 +01:00
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gUefiOvmfPkgTokenSpaceGuid.PcdOvmfSecPageTablesBase|0x0|UINT32|0x11
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gUefiOvmfPkgTokenSpaceGuid.PcdOvmfSecPageTablesSize|0x0|UINT32|0x12
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2014-01-21 20:38:43 +01:00
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gUefiOvmfPkgTokenSpaceGuid.PcdOvmfSecPeiTempRamBase|0x0|UINT32|0x13
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gUefiOvmfPkgTokenSpaceGuid.PcdOvmfSecPeiTempRamSize|0x0|UINT32|0x14
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2014-03-04 09:02:16 +01:00
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gUefiOvmfPkgTokenSpaceGuid.PcdS3AcpiReservedMemoryBase|0x0|UINT32|0x17
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2014-03-04 09:03:23 +01:00
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gUefiOvmfPkgTokenSpaceGuid.PcdOvmfLockBoxStorageBase|0x0|UINT32|0x18
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gUefiOvmfPkgTokenSpaceGuid.PcdOvmfLockBoxStorageSize|0x0|UINT32|0x19
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OvmfPkg: PlatformPei: protect SEC's GUIDed section handler table thru S3
OVMF's SecMain is unique in the sense that it links against the following
two libraries *in combination*:
- IntelFrameworkModulePkg/Library/LzmaCustomDecompressLib/
LzmaCustomDecompressLib.inf
- MdePkg/Library/BaseExtractGuidedSectionLib/
BaseExtractGuidedSectionLib.inf
The ExtractGuidedSectionLib library class allows decompressor modules to
register themselves (keyed by GUID) with it, and it allows clients to
decompress file sections with a registered decompressor module that
matches the section's GUID.
BaseExtractGuidedSectionLib is a library instance (of type BASE) for this
library class. It has no constructor function.
LzmaCustomDecompressLib is a compatible decompressor module (of type
BASE). Its section type GUID is
gLzmaCustomDecompressGuid == EE4E5898-3914-4259-9D6E-DC7BD79403CF
When OVMF's SecMain module starts, the LzmaCustomDecompressLib constructor
function is executed, which registers its LZMA decompressor with the above
GUID, by calling into BaseExtractGuidedSectionLib:
LzmaDecompressLibConstructor() [GuidedSectionExtraction.c]
ExtractGuidedSectionRegisterHandlers() [BaseExtractGuidedSectionLib.c]
GetExtractGuidedSectionHandlerInfo()
PcdGet64 (PcdGuidedExtractHandlerTableAddress) -- NOTE THIS
Later, during a normal (non-S3) boot, SecMain utilizes this decompressor
to get information about, and to decompress, sections of the OVMF firmware
image:
SecCoreStartupWithStack() [OvmfPkg/Sec/SecMain.c]
SecStartupPhase2()
FindAndReportEntryPoints()
FindPeiCoreImageBase()
DecompressMemFvs()
ExtractGuidedSectionGetInfo() [BaseExtractGuidedSectionLib.c]
ExtractGuidedSectionDecode() [BaseExtractGuidedSectionLib.c]
Notably, only the extraction depends on full-config-boot; the registration
of LzmaCustomDecompressLib occurs unconditionally in the SecMain EFI
binary, triggered by the library constructor function.
This is where the bug happens. BaseExtractGuidedSectionLib maintains the
table of GUIDed decompressors (section handlers) at a fixed memory
location; selected by PcdGuidedExtractHandlerTableAddress (declared in
MdePkg.dec). The default value of this PCD is 0x1000000 (16 MB).
This causes SecMain to corrupt guest OS memory during S3, leading to
random crashes. Compare the following two memory dumps, the first taken
right before suspending, the second taken right after resuming a RHEL-7
guest:
crash> rd -8 -p 1000000 0x50
1000000: c0 00 08 00 02 00 00 00 00 00 00 00 00 00 00 00 ................
1000010: d0 33 0c 00 00 c9 ff ff c0 10 00 01 00 88 ff ff .3..............
1000020: 0a 6d 57 32 0f 00 00 00 38 00 00 01 00 88 ff ff .mW2....8.......
1000030: 00 00 00 00 00 00 00 00 73 69 67 6e 61 6c 6d 6f ........signalmo
1000040: 64 75 6c 65 2e 73 6f 00 00 00 00 00 00 00 00 00 dule.so.........
vs.
crash> rd -8 -p 1000000 0x50
1000000: 45 47 53 49 01 00 00 00 20 00 00 01 00 00 00 00 EGSI.... .......
1000010: 20 01 00 01 00 00 00 00 a0 01 00 01 00 00 00 00 ...............
1000020: 98 58 4e ee 14 39 59 42 9d 6e dc 7b d7 94 03 cf .XN..9YB.n.{....
1000030: 00 00 00 00 00 00 00 00 73 69 67 6e 61 6c 6d 6f ........signalmo
1000040: 64 75 6c 65 2e 73 6f 00 00 00 00 00 00 00 00 00 dule.so.........
The "EGSI" signature corresponds to EXTRACT_HANDLER_INFO_SIGNATURE
declared in
MdePkg/Library/BaseExtractGuidedSectionLib/BaseExtractGuidedSectionLib.c.
Additionally, the gLzmaCustomDecompressGuid (quoted above) is visible at
guest-phys offset 0x1000020.
Fix the problem as follows:
- Carve out 4KB from the 36KB gap that we currently have between
PcdOvmfLockBoxStorageBase + PcdOvmfLockBoxStorageSize == 8220 KB
and
PcdOvmfSecPeiTempRamBase == 8256 KB.
- Point PcdGuidedExtractHandlerTableAddress to 8220 KB (0x00807000).
- Cover the area with an EfiACPIMemoryNVS type memalloc HOB, if S3 is
supported and we're not currently resuming.
The 4KB size that we pick is an upper estimate for
BaseExtractGuidedSectionLib's internal storage size. The latter is
calculated as follows (see GetExtractGuidedSectionHandlerInfo()):
sizeof(EXTRACT_GUIDED_SECTION_HANDLER_INFO) + // 32
PcdMaximumGuidedExtractHandler * (
sizeof(GUID) + // 16
sizeof(EXTRACT_GUIDED_SECTION_DECODE_HANDLER) + // 8
sizeof(EXTRACT_GUIDED_SECTION_GET_INFO_HANDLER) // 8
)
OVMF sets PcdMaximumGuidedExtractHandler to 16 decimal (which is the
MdePkg default too), yielding 32 + 16 * (16 + 8 + 8) == 544 bytes.
Regarding the lifecycle of the new area:
(a) when and how it is initialized after first boot of the VM
The library linked into SecMain finds that the area lacks the signature.
It initializes the signature, plus the rest of the structure. This is
independent of S3 support.
Consumption of the area is also limited to SEC (but consumption does
depend on full-config-boot).
(b) how it is protected from memory allocations during DXE
It is not, in the general case; and we don't need to. Nothing else links
against BaseExtractGuidedSectionLib; it's OK if DXE overwrites the area.
(c) how it is protected from the OS
When S3 is enabled, we cover it with AcpiNVS in InitializeRamRegions().
When S3 is not supported, the range is not protected.
(d) how it is accessed on the S3 resume path
Examined by the library linked into SecMain. Registrations update the
table in-place (based on GUID matches).
(e) how it is accessed on the warm reset path
If S3 is enabled, then the OS won't damage the table (due to (c)), hence
see (d).
If S3 is unsupported, then the OS may or may not overwrite the
signature. (It likely will.) This is identical to the pre-patch status.
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Laszlo Ersek <lersek@redhat.com>
Reviewed-by: Jordan Justen <jordan.l.justen@intel.com>
git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@15433 6f19259b-4bc3-4df7-8a09-765794883524
2014-04-05 23:26:09 +02:00
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gUefiOvmfPkgTokenSpaceGuid.PcdGuidedExtractHandlerTableSize|0x0|UINT32|0x1a
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OvmfPkg: Sec: assert the build-time calculated end of the scratch buffer
The DecompressMemFvs() function in "OvmfPkg/Sec/SecMain.c" uses more
memory, temporarily, than what PEIFV and DXEFV will ultimately need.
First, it uses an output buffer for decompression, second, the
decompression itself needs a scratch buffer (and this scratch buffer is
the highest area that SEC uses).
DecompressMemFvs() used to be called on normal boots only (ie. not on S3
resume), which is why the decompression output buffer and the scratch
buffer were allowed to scribble over RAM. However, we'll soon start to
worry during S3 resume that the runtime OS might tamper with the
pre-decompressed PEIFV, and we'll decompress the firmware volumes on S3
resume too, from pristine flash. For this we'll need to know the end of
the scratch buffer in advance, so we can prepare a non-malicious OS for
it.
Calculate the end of the scratch buffer statically in the FDF files, and
assert in DecompressMemFvs() that the runtime decompression will match it.
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Laszlo Ersek <lersek@redhat.com>
Reviewed-by: Jordan Justen <jordan.l.justen@intel.com>
git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@19036 6f19259b-4bc3-4df7-8a09-765794883524
2015-11-30 19:41:20 +01:00
|
|
|
gUefiOvmfPkgTokenSpaceGuid.PcdOvmfDecompressionScratchEnd|0x0|UINT32|0x1f
|
2013-11-12 19:34:11 +01:00
|
|
|
|
2011-05-05 18:15:35 +02:00
|
|
|
[PcdsDynamic, PcdsDynamicEx]
|
2010-11-02 06:27:15 +01:00
|
|
|
gUefiOvmfPkgTokenSpaceGuid.PcdEmuVariableEvent|0|UINT64|2
|
2013-11-12 19:35:23 +01:00
|
|
|
gUefiOvmfPkgTokenSpaceGuid.PcdOvmfFlashVariablesEnable|FALSE|BOOLEAN|0x10
|
2014-11-14 01:37:39 +01:00
|
|
|
gUefiOvmfPkgTokenSpaceGuid.PcdOvmfHostBridgePciDevId|0|UINT16|0x1b
|
2015-08-06 12:13:55 +02:00
|
|
|
gUefiOvmfPkgTokenSpaceGuid.PcdQemuSmbiosValidated|FALSE|BOOLEAN|0x21
|
2009-05-27 23:10:18 +02:00
|
|
|
|
2012-03-09 18:38:21 +01:00
|
|
|
[PcdsFeatureFlag]
|
|
|
|
|
gUefiOvmfPkgTokenSpaceGuid.PcdSecureBootEnable|FALSE|BOOLEAN|3
|
2015-01-02 13:08:02 +01:00
|
|
|
gUefiOvmfPkgTokenSpaceGuid.PcdQemuBootOrderPciTranslation|TRUE|BOOLEAN|0x1c
|
2015-01-02 13:08:19 +01:00
|
|
|
gUefiOvmfPkgTokenSpaceGuid.PcdQemuBootOrderMmioTranslation|FALSE|BOOLEAN|0x1d
|
2015-11-30 19:41:10 +01:00
|
|
|
|
|
|
|
|
## This feature flag enables SMM/SMRAM support. Note that it also requires
|
|
|
|
|
# such support from the underlying QEMU instance; if that support is not
|
|
|
|
|
# present, the firmware will reject continuing after a certain point.
|
|
|
|
|
#
|
|
|
|
|
# The flag also acts as a general "security switch"; when TRUE, many
|
|
|
|
|
# components will change behavior, with the goal of preventing a malicious
|
|
|
|
|
# runtime OS from tampering with firmware structures (special memory ranges
|
|
|
|
|
# used by OVMF, the varstore pflash chip, LockBox etc).
|
|
|
|
|
gUefiOvmfPkgTokenSpaceGuid.PcdSmmSmramRequire|FALSE|BOOLEAN|0x1e
|
