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095ea049e2
This changeset extends the documentation with the UEFI and Windows related info. The focus is on providing consumer with a minimum necessary and proper piece of the information to enter the features quickly. While UEFI is a cross platform topic, it is a required prerequisite for the Windows usage. Signed-off-by: Anatol Belski <anbelski@linux.microsoft.com>
43 lines
1.7 KiB
Markdown
43 lines
1.7 KiB
Markdown
# UEFI Boot
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Cloud Hypervisor supports UEFI boot through the utilization of the EDK II based UEFI firmware.
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## Building UEFI Firmware
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To avoid any unnecessary issues, it is recommended to use Ubuntu 18.04 and its default toolset. Any other compatible Linux distribution is otherwise suitable, however it is suggested to use a temporary Docker container with Ubuntu 18.04 for a quick build on an existing Linux machine.
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The commands below will compile an OVMF firmware suitable for Cloud Hypervisor.
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```shell
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sudo apt-get update
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sudo apt-get install uuid-dev nasm iasl build-essential python3-distutils git
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git clone https://github.com/cloud-hypervisor/edk2 -b ch
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cd edk2
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. edksetup.sh
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git submodule update --init
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echo "ACTIVE_PLATFORM=OvmfPkg/OvmfCh.dsc" >> Conf/target.txt
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echo "TARGET_ARCH=X64" >> Conf/target.txt
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echo "TOOL_CHAIN_TAG=GCC5" >> Conf/target.txt
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make -C ./BaseTools
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build
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```
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After the successful build, the resulting firmware binaries are available under `Build/OvmfCh/DEBUG_GCC5/FV` underneath the edk2 checkout.
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## Using OVMF Binaries
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Any UEFI capable image can be booted using the Cloud Hypervisor specific firmware. Windows guests under Cloud Hypervisor only support UEFI boot, therefore OVMF is mandatory there.
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To make Cloud Hypervisor use UEFI boot, pass the `OVMF.fd` file path as an argument to the `--kernel` option. The firmware file will be opened in read only mode.
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The same firmware can be used with Cloud Hypervisor or with QEMU. This is particularly useful if using QEMU for the preparation phase.
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# Links
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- [OVMF wiki](https://github.com/tianocore/tianocore.github.io/wiki/OVMF)
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- [Cloud Hypervisor specific tree](https://github.com/cloud-hypervisor/edk2/tree/ch)
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