Matthew Carlson a09df5d2e1 OvmfPkg: Add RngLib based on TimerLib for Crypto 3 лет назад
..
8254TimerDxe 239b50a863 OvmfPkg: End timer interrupt later to avoid stack overflow under load 4 лет назад
8259InterruptControllerDxe c01852433f OvmfPkg/8259InterruptControllerDxe: Update to make it build for OVMF 5 лет назад
AcpiPlatformDxe 70d5086c32 OvmfPkg: replace old EFI_D_ debug levels with new DEBUG_ ones 4 лет назад
AcpiTables f221466ea7 OvmfPkg/Acpi: Fix few typos 4 лет назад
AmdSevDxe b26f0cf9ee OvmfPkg: Replace BSD License with BSD+Patent License 5 лет назад
Bhyve a09df5d2e1 OvmfPkg: Add RngLib based on TimerLib for Crypto 3 лет назад
CompatImageLoaderDxe d55cfdc51f OvmfPkg IA32: add support for loading X64 images 4 лет назад
CpuHotplugSmm cbccf99592 OvmfPkg/CpuHotplugSmm: fix CPU hotplug race just after SMI broadcast 3 лет назад
CpuS3DataDxe 1158fc8e2c OvmfPkg/CpuS3DataDxe: enable S3 resume after CPU hotplug 4 лет назад
Csm 70d5086c32 OvmfPkg: replace old EFI_D_ debug levels with new DEBUG_ ones 4 лет назад
EmuVariableFvbRuntimeDxe 70d5086c32 OvmfPkg: replace old EFI_D_ debug levels with new DEBUG_ ones 4 лет назад
EnrollDefaultKeys 59b754c9f6 OvmfPkg/EnrollDefaultKeys: clean up Base64Decode() retval handling 4 лет назад
Include 60835c96cd OvmfPkg: Fix spelling mistake for occurred 3 лет назад
IncompatiblePciDeviceSupportDxe 70d5086c32 OvmfPkg: replace old EFI_D_ debug levels with new DEBUG_ ones 4 лет назад
IoMmuDxe b26f0cf9ee OvmfPkg: Replace BSD License with BSD+Patent License 5 лет назад
Library 5648836987 OvmfPkg: drop redundant VendorID check in VirtioMmioDeviceLib 3 лет назад
LinuxInitrdDynamicShellCommand 5a8bc527b3 OvmfPkg/LinuxInitrdDynamicShellCommand: Cast UNIT64 to UNITN in assignment 4 лет назад
LsiScsiDxe 31830b0702 OvmfPkg/LsiScsiDxe: Process the SCSI Request Packet 3 лет назад
MptScsiDxe c635a56384 OvmfPkg/MptScsiDxe: Reset device on ExitBootServices() 4 лет назад
PciHotPlugInitDxe 70d5086c32 OvmfPkg: replace old EFI_D_ debug levels with new DEBUG_ ones 4 лет назад
PlatformCI 6cdf647b5f OvmfPkg: Add Platform CI and configuration for Core CI 4 лет назад
PlatformDxe 70d5086c32 OvmfPkg: replace old EFI_D_ debug levels with new DEBUG_ ones 4 лет назад
PlatformPei 3b49d0a598 OvmfPkg: Move the GHCB allocations into reserved memory 3 лет назад
PvScsiDxe e210fc130e OvmfPkg/PvScsiDxe: Refactor setup of rings to separate function 4 лет назад
QemuFlashFvbServicesRuntimeDxe 437eb3f7a8 OvmfPkg/QemuFlashFvbServicesRuntimeDxe: Bypass flash detection with SEV-ES 3 лет назад
QemuKernelLoaderFsDxe 40d572f70d OvmfPkg/QemuKernelLoaderFsDxe: drop tentative const object definition 4 лет назад
QemuRamfbDxe b26f0cf9ee OvmfPkg: Replace BSD License with BSD+Patent License 5 лет назад
QemuVideoDxe 70d5086c32 OvmfPkg: replace old EFI_D_ debug levels with new DEBUG_ ones 4 лет назад
ResetVector 30937f2f98 OvmfPkg: Use the SEV-ES work area for the SEV-ES AP reset vector 3 лет назад
SataControllerDxe 70d5086c32 OvmfPkg: replace old EFI_D_ debug levels with new DEBUG_ ones 4 лет назад
Sec e2db781f0c OvmfPkg/Sec: Enable cache early to speed up booting 3 лет назад
SioBusDxe 60835c96cd OvmfPkg: Fix spelling mistake for occurred 3 лет назад
SmbiosPlatformDxe b26f0cf9ee OvmfPkg: Replace BSD License with BSD+Patent License 5 лет назад
SmmAccess 70d5086c32 OvmfPkg: replace old EFI_D_ debug levels with new DEBUG_ ones 4 лет назад
SmmControl2Dxe 5ba203b54e OvmfPkg/SmmControl2Dxe: negotiate ICH9_LPC_SMI_F_CPU_HOTPLUG 3 лет назад
Tcg 82e0b2f043 OvmfPkg/Tcg2ConfigPei: restrict BaseLib class dependency to IA32 and X64 4 лет назад
Virtio10Dxe b26f0cf9ee OvmfPkg: Replace BSD License with BSD+Patent License 5 лет назад
VirtioBlkDxe b26f0cf9ee OvmfPkg: Replace BSD License with BSD+Patent License 5 лет назад
VirtioGpuDxe 70d5086c32 OvmfPkg: replace old EFI_D_ debug levels with new DEBUG_ ones 4 лет назад
VirtioNetDxe 9854561c08 OvmfPkg/Virtio: Fix few typos 4 лет назад
VirtioPciDeviceDxe b26f0cf9ee OvmfPkg: Replace BSD License with BSD+Patent License 5 лет назад
VirtioRngDxe 9854561c08 OvmfPkg/Virtio: Fix few typos 4 лет назад
VirtioScsiDxe 9854561c08 OvmfPkg/Virtio: Fix few typos 4 лет назад
XenBusDxe 70d5086c32 OvmfPkg: replace old EFI_D_ debug levels with new DEBUG_ ones 4 лет назад
XenIoPciDxe 70d5086c32 OvmfPkg: replace old EFI_D_ debug levels with new DEBUG_ ones 4 лет назад
XenIoPvhDxe 833cd3e0c0 OvmfPkg: Introduce XenIoPvhDxe to initialize Grant Tables 4 лет назад
XenPlatformPei 198a8dc9cd OvmfPkg/XenPlatformPei: Ignore missing PCI Host Bridge on Xen PVH 4 лет назад
XenPvBlkDxe 70d5086c32 OvmfPkg: replace old EFI_D_ debug levels with new DEBUG_ ones 4 лет назад
XenResetVector f198e254f7 OvmfPkg/XenResetVector: Allow jumpstart from either hvmloader or PVH 4 лет назад
XenTimerDxe 239b50a863 OvmfPkg: End timer interrupt later to avoid stack overflow under load 4 лет назад
FvmainCompactScratchEnd.fdf.inc 799d88c1ba OvmfPkg: give more telling names to some FDF include files 4 лет назад
License.txt 07a0f27b0e OvmfPkg/License.txt: refresh the MIT license text and include the SPDX ID 5 лет назад
OvmfPkg.ci.yaml 354ef14cf5 OvmfPkg/OvmfPkg.ci.yaml: Add configuration for Ecc check 3 лет назад
OvmfPkg.dec 6995a1b79b OvmfPkg: Create a GHCB page for use during Sec phase 3 лет назад
OvmfPkgDefines.fdf.inc 799d88c1ba OvmfPkg: give more telling names to some FDF include files 4 лет назад
OvmfPkgIa32.dsc a09df5d2e1 OvmfPkg: Add RngLib based on TimerLib for Crypto 3 лет назад
OvmfPkgIa32.fdf e94d04a01b OvmfPkg/LsiScsiDxe: Create the empty driver 3 лет назад
OvmfPkgIa32X64.dsc a09df5d2e1 OvmfPkg: Add RngLib based on TimerLib for Crypto 3 лет назад
OvmfPkgIa32X64.fdf e94d04a01b OvmfPkg/LsiScsiDxe: Create the empty driver 3 лет назад
OvmfPkgX64.dsc a09df5d2e1 OvmfPkg: Add RngLib based on TimerLib for Crypto 3 лет назад
OvmfPkgX64.fdf 43c3df7846 OvmfPkg: Reserve a page in memory for the SEV-ES usage 3 лет назад
OvmfXen.dsc a09df5d2e1 OvmfPkg: Add RngLib based on TimerLib for Crypto 3 лет назад
OvmfXen.fdf bcf181a33b OvmfPkg: Skip initrd command on Xcode toolchain 4 лет назад
OvmfXenElfHeaderGenerator.c 1e9d6b0f98 OvmfPkg/OvmfXen: Creating an ELF header 4 лет назад
README 1631bb26ae OvmfPkg/README: Update the network build flags 5 лет назад
VarStore.fdf.inc b26f0cf9ee OvmfPkg: Replace BSD License with BSD+Patent License 5 лет назад
build.sh 8fed4e47d9 OvmfPkg/build.sh: use newer '-drive if=pflash' syntax when running qemu 4 лет назад

README


=== OVMF OVERVIEW ===

The Open Virtual Machine Firmware (OVMF) project aims
to support firmware for Virtual Machines using the edk2
code base. More information can be found at:

http://www.tianocore.org/ovmf/

=== STATUS ===

Current capabilities:
* IA32 and X64 architectures
* QEMU (0.10.0 or later)
- Video, keyboard, IDE, CD-ROM, serial
- Runs UEFI shell
- Optional NIC support. Requires QEMU (0.12.2 or later)
* UEFI Linux boots
* UEFI Windows 8 boots
* UEFI Windows 7 & Windows 2008 Server boot (see important notes below!)

=== FUTURE PLANS ===

* Test/Stabilize UEFI Self-Certification Tests (SCT) results

=== BUILDING OVMF ===

Pre-requisites:
* Build environment capable of build the edk2 MdeModulePkg.
* A properly configured ASL compiler:
- Intel ASL compiler: Available from http://www.acpica.org
- Microsoft ASL compiler: Available from http://www.acpi.info
* NASM: http://www.nasm.us/

Update Conf/target.txt ACTIVE_PLATFORM for OVMF:
PEI arch DXE arch UEFI interfaces
* OvmfPkg/OvmfPkgIa32.dsc IA32 IA32 IA32
* OvmfPkg/OvmfPkgIa32X64.dsc IA32 X64 X64
* OvmfPkg/OvmfPkgX64.dsc X64 X64 X64

Update Conf/target.txt TARGET_ARCH based on the .dsc file:
TARGET_ARCH
* OvmfPkg/OvmfPkgIa32.dsc IA32
* OvmfPkg/OvmfPkgIa32X64.dsc IA32 X64
* OvmfPkg/OvmfPkgX64.dsc X64

Following the edk2 build process, you will find the OVMF binaries
under the $WORKSPACE/Build/*/*/FV directory. The actual path will
depend on how your build is configured. You can expect to find
these binary outputs:
* OVMF.FD
- Please note! This filename has changed. Older releases used OVMF.Fv.
* OvmfVideo.rom
- This file is not built separately any longer, starting with svn r13520.

More information on building OVMF can be found at:

https://github.com/tianocore/tianocore.github.io/wiki/How%20to%20build%20OVMF

=== RUNNING OVMF on QEMU ===

* QEMU 0.12.2 or later is required.
* Be sure to use qemu-system-x86_64, if you are using and X64 firmware.
(qemu-system-x86_64 works for the IA32 firmware as well, of course.)
* Use OVMF for QEMU firmware (3 options available)
- Option 1: QEMU 1.6 or newer; Use QEMU -pflash parameter
* QEMU/OVMF will use emulated flash, and fully support UEFI variables
* Run qemu with: -pflash path/to/OVMF.fd
* Note that this option is required for running SecureBoot-enabled builds
(-D SECURE_BOOT_ENABLE).
- Option 2: Use QEMU -bios parameter
* Note that UEFI variables will be partially emulated, and non-volatile
variables may lose their contents after a reboot
* Run qemu with: -bios path/to/OVMF.fd
- Option 3: Use QEMU -L parameter
* Note that UEFI variables will be partially emulated, and non-volatile
variables may lose their contents after a reboot
* Either copy, rename or symlink OVMF.fd => bios.bin
* Use the QEMU -L parameter to specify the directory where the bios.bin
file is located.
* The EFI shell is built into OVMF builds at this time, so it should
run automatically if a UEFI boot application is not found on the
removable media.
* On Linux, newer version of QEMU may enable KVM feature, and this might
cause OVMF to fail to boot. The QEMU '-no-kvm' may allow OVMF to boot.
* Capturing OVMF debug messages on qemu:
- The default OVMF build writes debug messages to IO port 0x402. The
following qemu command line options save them in the file called
debug.log: '-debugcon file:debug.log -global isa-debugcon.iobase=0x402'.
- It is possible to revert to the original behavior, when debug messages were
written to the emulated serial port (potentially intermixing OVMF debug
output with UEFI serial console output). For this the
'-D DEBUG_ON_SERIAL_PORT' option has to be passed to the build command (see
the next section), and in order to capture the serial output qemu needs to
be started with eg. '-serial file:serial.log'.
- Debug messages fall into several categories. Logged vs. suppressed
categories are controlled at OVMF build time by the
'gEfiMdePkgTokenSpaceGuid.PcdDebugPrintErrorLevel' bitmask (an UINT32
value) in the selected .dsc file. Individual bits of this bitmask are
defined in . One non-default bit (with
some performance impact) that is frequently set for debugging is 0x00400000
(DEBUG_VERBOSE).
- The RELEASE build target ('-b RELEASE' build option, see below) disables
all debug messages. The default build target is DEBUG.

=== Build Scripts ===

On systems with the bash shell you can use OvmfPkg/build.sh to simplify
building and running OVMF.

So, for example, to build + run OVMF X64:
$ OvmfPkg/build.sh -a X64
$ OvmfPkg/build.sh -a X64 qemu

And to run a 64-bit UEFI bootable ISO image:
$ OvmfPkg/build.sh -a X64 qemu -cdrom /path/to/disk-image.iso

To build a 32-bit OVMF without debug messages using GCC 4.8:
$ OvmfPkg/build.sh -a IA32 -b RELEASE -t GCC48

=== SMM support ===

Requirements:
* SMM support requires QEMU 2.5.
* The minimum required QEMU machine type is "pc-q35-2.5".
* SMM with KVM requires Linux 4.4 (host).

OVMF is capable of utilizing SMM if the underlying QEMU or KVM hypervisor
emulates SMM. SMM is put to use in the S3 suspend and resume infrastructure,
and in the UEFI variable driver stack. The purpose is (virtual) hardware
separation between the runtime guest OS and the firmware (OVMF), with the
intent to make Secure Boot actually secure, by preventing the runtime guest OS
from tampering with the variable store and S3 areas.

For SMM support, OVMF must be built with the "-D SMM_REQUIRE" option. The
resultant firmware binary will check if QEMU actually provides SMM emulation;
if it doesn't, then OVMF will log an error and trigger an assertion failure
during boot (even in RELEASE builds). Both the naming of the flag (SMM_REQUIRE,
instead of SMM_ENABLE), and this behavior are consistent with the goal
described above: this is supposed to be a security feature, and fallbacks are
not allowed. Similarly, a pflash-backed variable store is a requirement.

QEMU should be started with the options listed below (in addition to any other
guest-specific flags). The command line should be gradually composed from the
hints below. '\' is used to extend the command line to multiple lines, and '^'
can be used on Windows.

* QEMU binary and options specific to 32-bit guests:

$ qemu-system-i386 -cpu coreduo,-nx \

or

$ qemu-system-x86_64 -cpu ,-lm,-nx \

* QEMU binary for running 64-bit guests (no particular options):

$ qemu-system-x86_64 \

* Flags common to all SMM scenarios (only the Q35 machine type is supported):

-machine q35,smm=on,accel=(tcg|kvm) \
-m ... \
-smp ... \
-global driver=cfi.pflash01,property=secure,value=on \
-drive if=pflash,format=raw,unit=0,file=OVMF_CODE.fd,readonly=on \
-drive if=pflash,format=raw,unit=1,file=copy_of_OVMF_VARS.fd \

* In order to disable S3, add:

-global ICH9-LPC.disable_s3=1 \

=== Network Support ===

OVMF provides a UEFI network stack by default. Its lowest level driver is the
NIC driver, higher levels are generic. In order to make DHCP, PXE Boot, and eg.
socket test utilities from the StdLib edk2 package work, (1) qemu has to be
configured to emulate a NIC, (2) a matching UEFI NIC driver must be available
when OVMF boots.

(If a NIC is configured for the virtual machine, and -- dependent on boot order
-- PXE booting is attempted, but no DHCP server responds to OVMF's DHCP
DISCOVER message at startup, the boot process may take approx. 3 seconds
longer.)

* For each NIC emulated by qemu, a GPLv2 licensed UEFI driver is available from
the iPXE project. The qemu source distribution, starting with version 1.5,
contains prebuilt binaries of these drivers (and of course allows one to
rebuild them from source as well). This is the recommended set of drivers.

* Use the qemu -netdev and -device options, or the legacy -net option, to
enable NIC support: .

* For a qemu >= 1.5 binary running *without* any "-M machine" option where
"machine" would identify a < qemu-1.5 configuration (for example: "-M
pc-i440fx-1.4" or "-M pc-0.13"), the iPXE drivers are automatically available
to and configured for OVMF in the default qemu installation.

* For a qemu binary in [0.13, 1.5), or a qemu >= 1.5 binary with an "-M
machine" option where "machine" selects a < qemu-1.5 configuration:

- download a >= 1.5.0-rc1 source tarball from ,

- extract the following iPXE driver files from the tarball and install them
in a location that is accessible to qemu processes (this may depend on your
SELinux configuration, for example):

qemu-VERSION/pc-bios/efi-e1000.rom
qemu-VERSION/pc-bios/efi-ne2k_pci.rom
qemu-VERSION/pc-bios/efi-pcnet.rom
qemu-VERSION/pc-bios/efi-rtl8139.rom
qemu-VERSION/pc-bios/efi-virtio.rom

- extend the NIC's -device option on the qemu command line with a matching
"romfile=" optarg:

-device e1000,...,romfile=/full/path/to/efi-e1000.rom
-device ne2k_pci,...,romfile=/full/path/to/efi-ne2k_pci.rom
-device pcnet,...,romfile=/full/path/to/efi-pcnet.rom
-device rtl8139,...,romfile=/full/path/to/efi-rtl8139.rom
-device virtio-net-pci,...,romfile=/full/path/to/efi-virtio.rom

* Independently of the iPXE NIC drivers, the default OVMF build provides a
basic virtio-net driver, located in OvmfPkg/VirtioNetDxe.

* Also independently of the iPXE NIC drivers, Intel's proprietary E1000 NIC
driver (from the BootUtil distribution) can be embedded in the OVMF image at
build time:

- Download BootUtil:
- Navigate to
https://downloadcenter.intel.com/download/19186/Ethernet-Intel-Ethernet-Connections-Boot-Utility-Preboot-Images-and-EFI-Drivers
- Click the download link for "PREBOOT.EXE".
- Accept the Intel Software License Agreement that appears.
- Unzip "PREBOOT.EXE" into a separate directory (this works with the
"unzip" utility on platforms different from Windows as well).
- Copy the "APPS/EFI/EFIx64/E3522X2.EFI" driver binary to
"Intel3.5/EFIX64/E3522X2.EFI" in your WORKSPACE.
- Intel have stopped distributing an IA32 driver binary (which used to
match the filename pattern "E35??E2.EFI"), thus this method will only
work for the IA32X64 and X64 builds of OVMF.

- Include the driver in OVMF during the build:
- Add "-D E1000_ENABLE" to your build command (only when building
"OvmfPkg/OvmfPkgIa32X64.dsc" or "OvmfPkg/OvmfPkgX64.dsc").
- For example: "build -D E1000_ENABLE".

* When a matching iPXE driver is configured for a NIC as described above, it
takes priority over other drivers that could possibly drive the card too:

| e1000 ne2k_pci pcnet rtl8139 virtio-net-pci
---------------------+------------------------------------------------
iPXE | x x x x x
VirtioNetDxe | x
Intel BootUtil (X64) | x

=== HTTPS Boot ===

HTTPS Boot is an alternative solution to PXE. It replaces the tftp server
with a HTTPS server so the firmware can download the images through a trusted
and encrypted connection.

* To enable HTTPS Boot, you have to build OVMF with -D NETWORK_HTTP_BOOT_ENABLE
and -D NETWORK_TLS_ENABLE. The former brings in the HTTP stack from
NetworkPkg while the latter enables TLS support in both NetworkPkg and
CryptoPkg.

If you want to exclude the unsecured HTTP connection completely, OVMF has to
be built with -D NETWORK_ALLOW_HTTP_CONNECTIONS=FALSE so that only the HTTPS
connections will be accepted.

* By default, there is no trusted certificate. The user has to import the
certificates either manually with "Tls Auth Configuration" utility in the
firmware UI or through the fw_cfg entry, etc/edk2/https/cacerts.

-fw_cfg name=etc/edk2/https/cacerts,file=

The blob for etc/edk2/https/cacerts has to be in the format of Signature
Database(*1). You can use p11-kit(*2) or efisiglit(*3) to create the
certificate list.

If you want to create the certificate list based on the CA certificates
in your local host, p11-kit will be a good choice. Here is the command to
create the list:

p11-kit extract --format=edk2-cacerts --filter=ca-anchors \
--overwrite --purpose=server-auth

If you only want to import one certificate, efisiglist is the tool for you:

efisiglist -a -o

Please note that the certificate has to be in the DER format.

You can also append a certificate to the existing list with the following
command:

efisiglist -i -a -o

NOTE: You may need the patch to make efisiglist generate the correct header.
(https://github.com/rhboot/pesign/pull/40)

* Besides the trusted certificates, it's also possible to configure the trusted
cipher suites for HTTPS through another fw_cfg entry: etc/edk2/https/ciphers.

-fw_cfg name=etc/edk2/https/ciphers,file=

OVMF expects a binary UINT16 array which comprises the cipher suites HEX
IDs(*4). If the cipher suite list is given, OVMF will choose the cipher
suite from the intersection of the given list and the built-in cipher
suites. Otherwise, OVMF just chooses whatever proper cipher suites from the
built-in ones.

While the tool(*5) to create the cipher suite array is still under
development, the array can be generated with the following script:

export LC_ALL=C
openssl ciphers -V \
| sed -r -n \
-e 's/^ *0x([0-9A-F]{2}),0x([0-9A-F]{2}) - .*$/\\\\x\1 \\\\x\2/p' \
| xargs -r -- printf -- '%b' > ciphers.bin

This script creates ciphers.bin that contains all the cipher suite IDs
supported by openssl according to the local host configuration.

You may want to enable only a limited set of cipher suites. Then, you
should check the validity of your list first:

openssl ciphers -V

If all the cipher suites in your list map to the proper HEX IDs, go ahead
to modify the script and execute it:

export LC_ALL=C
openssl ciphers -V \
| sed -r -n \
-e 's/^ *0x([0-9A-F]{2}),0x([0-9A-F]{2}) - .*$/\\\\x\1 \\\\x\2/p' \
| xargs -r -- printf -- '%b' > ciphers.bin

* In the future (after release 2.12), QEMU should populate both above fw_cfg
files automatically from the local host configuration, and enable the user
to override either with dedicated options or properties.

(*1) See "31.4.1 Signature Database" in UEFI specification 2.7 errata A.
(*2) p11-kit: https://github.com/p11-glue/p11-kit/
(*3) efisiglist: https://github.com/rhboot/pesign/blob/master/src/efisiglist.c
(*4) https://wiki.mozilla.org/Security/Server_Side_TLS#Cipher_names_correspondence_table
(*5) update-crypto-policies: https://gitlab.com/redhat-crypto/fedora-crypto-policies

=== OVMF Flash Layout ===

Like all current IA32/X64 system designs, OVMF's firmware device (rom/flash)
appears in QEMU's physical address space just below 4GB (0x100000000).

OVMF supports building a 1MB, 2MB or 4MB flash image (see the DSC files for the
FD_SIZE_1MB, FD_SIZE_2MB, FD_SIZE_4MB build defines). The base address for the
1MB image in QEMU physical memory is 0xfff00000. The base address for the 2MB
image is 0xffe00000. The base address for the 4MB image is 0xffc00000.

Using the 1MB or 2MB image, the layout of the firmware device in memory looks
like:

+--------------------------------------- 4GB (0x100000000)
| VTF0 (16-bit reset code) and OVMF SEC
| (SECFV, 208KB/0x34000)
+--------------------------------------- varies based on flash size
|
| Compressed main firmware image
| (FVMAIN_COMPACT)
|
+--------------------------------------- base + 0x20000
| Fault-tolerant write (FTW)
| Spare blocks (64KB/0x10000)
+--------------------------------------- base + 0x10000
| FTW Work block (4KB/0x1000)
+--------------------------------------- base + 0x0f000
| Event log area (4KB/0x1000)
+--------------------------------------- base + 0x0e000
| Non-volatile variable storage
| area (56KB/0xe000)
+--------------------------------------- base address

Using the 4MB image, the layout of the firmware device in memory looks like:

+--------------------------------------- base + 0x400000 (4GB/0x100000000)
| VTF0 (16-bit reset code) and OVMF SEC
| (SECFV, 208KB/0x34000)
+--------------------------------------- base + 0x3cc000
|
| Compressed main firmware image
| (FVMAIN_COMPACT, 3360KB/0x348000)
|
+--------------------------------------- base + 0x84000
| Fault-tolerant write (FTW)
| Spare blocks (264KB/0x42000)
+--------------------------------------- base + 0x42000
| FTW Work block (4KB/0x1000)
+--------------------------------------- base + 0x41000
| Event log area (4KB/0x1000)
+--------------------------------------- base + 0x40000
| Non-volatile variable storage
| area (256KB/0x40000)
+--------------------------------------- base address (0xffc00000)

The code in SECFV locates FVMAIN_COMPACT, and decompresses the
main firmware (MAINFV) into RAM memory at address 0x800000. The
remaining OVMF firmware then uses this decompressed firmware
volume image.

=== UEFI Windows 7 & Windows 2008 Server ===

* One of the '-vga std' and '-vga qxl' QEMU options should be used.
* Only one video mode, 1024x768x32, is supported at OS runtime.
* The '-vga qxl' QEMU option is recommended. After booting the installed
guest OS, select the video card in Device Manager, and upgrade its driver
to the QXL XDDM one. Download location:
, Guest | Windows binaries.
This enables further resolutions at OS runtime, and provides S3
(suspend/resume) capability.