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# Xen Build Instructions
The Yocto Project setup for AMD Xen configurations workflow is as follows. Be sure
to read everything below.
1. Follow [Building Instructions](../README.building.md) upto step 4.
2. Clone the meta-security repository.
```
$ cd ../sources
$ git clone -b <release-branch> https://git.yoctoproject.org/meta-security
$ cd -
```
3. Add xilinx-virtualization, security and tpm layer to bblayers.conf as shown below.
```
$ bitbake-layers add-layer ./<path-to-layer>/meta-security
$ bitbake-layers add-layer ./<path-to-layer>/meta-security/meta-tpm
$ bitbake-layers add-layer ./<path-to-layer>/meta-xilinx/meta-xilinx-virtualization
```
4. The following variables needs to be added to the end of the conf/local.conf file.
```
# Xen variables
BOOTMODE = "xen"
ENABLE_XEN_UBOOT_SCR = "1"
ENABLE_XEN_DTSI = "1"
ENABLE_XEN_QEMU_DTSI = "1"
# Default Xen Serial Console is serial0, if you are using serial1 then set as show below.
XEN_SERIAL_CONSOLES = "serial1"
# Variables for Xen JTAG or SD INITRD boot modes but this is not required for SD WIC image.
IMAGE_FSTYPES += "cpio.gz"
RAMDISK_IMAGE = "rootfs.cpio.gz"
# Variables for Xen SD WIC image boot flow.
IMAGE_FSTYPES += "wic"
WKS_FILES = "xilinx-default-sd.wks"
DISTRO_FEATURES:append = " multiarch security tpm virtualization vmsep xen"
IMAGE_FEATURES += "ssh-server-openssh"
DISTRO_FEATURES:append = " systemd"
VIRTUAL-RUNTIME_init_manager = "systemd"
DISTRO_FEATURES_BACKFILL_CONSIDERED = "sysvinit"
IMAGE_INSTALL:append = " \
kernel-module-xen-blkback \
kernel-module-xen-gntalloc \
kernel-module-xen-gntdev \
kernel-module-xen-netback \
kernel-module-xen-wdt \
xen \
xen-tools \
xen-tools-xenstat \
${@bb.utils.contains('DISTRO_FEATURES', 'vmsep', 'qemu-aarch64 qemu-keymaps', 'qemu', d)} \
"
```
5. Continue [Building Instructions](../README.building.md) from step 5.
## Xen Boot Instructions
> **Note:**
> * This README provides instructions for Xen Dom0 only.
1. Follow [Booting Instructions](../README.booting.md) upto step 2.
2. Verify Xen Dom0 is up and running on QEMU or target as shown below.
```
Poky (Yocto Project Reference Distro) 4.1.4 zynqmp-generic hvc0
zynqmp-generic login: root
root@zynqmp-generic:~# xl list
Name ID Mem VCPUs State Time(s)
Domain-0 0 1500 1 r----- 123.5
root@zynqmp-generic:~# xl info
host : zynqmp-generic
release : 6.1.0-xilinx-v2024.1
version : #1 SMP Thu Dec 21 07:00:11 UTC 2023
machine : aarch64
nr_cpus : 4
max_cpu_id : 3
nr_nodes : 1
cores_per_socket : 1
threads_per_core : 1
cpu_mhz : 99.990
hw_caps : 00000000:00000000:00000000:00000000:00000000:00000000:00000000:00000000
virt_caps : hvm hvm_directio hap iommu_hap_pt_share vpmu gnttab-v1
total_memory : 4095
free_memory : 2529
sharing_freed_memory : 0
sharing_used_memory : 0
outstanding_claims : 0
free_cpus : 0
xen_major : 4
xen_minor : 17
xen_extra : .0
xen_version : 4.17.0
xen_caps : xen-3.0-aarch64 xen-3.0-armv7l
xen_scheduler : credit2
xen_pagesize : 4096
platform_params : virt_start=0x200000
xen_changeset : Tue Dec 12 10:08:40 2023 +0100 git:38eebc6e5c-dirty
xen_commandline : console=dtuart dtuart=serial0 dom0_mem=1500M dom0_max_vcpus=1 bootscrub=0 vwfi=native
cc_compiler : aarch64-poky-linux-gcc (GCC) 12.2.0
cc_compile_by : santraju
cc_compile_domain :
cc_compile_date : 2023-12-12
build_id : 5e2952e1dd06c52a2a09ada7476333c48d88a285
xend_config_format : 4
root@zynqmp-generic:~#
```
## References
* https://xilinx-wiki.atlassian.net/wiki/spaces/A/pages/18842530/Xen+Hypervisor
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