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The Xen hypervisor built for Arm 32-bit targets can be launched with runqemu by providing a u-boot script and configuration for Qemu, which enables interactive testing of Xen images. Add qemuboot-xen-u-boot.bbclass to add a new bitbake task for generating the u-boot script. Since this increases the number of qemuboot-specific classes that are inherited by the xen-image-minimal recipe, change the inherit of all of these to only apply to qemu machines with the qemuall override. Update qemuboot-xen-defaults.bbclass to supply working default parameters for the qemuarm machine needed to boot successfully in testing. Also change all the arch-specific variable overrides into narrower qemu platform overrides instead to avoid unnecessary interactions with other Arm platform machines. Signed-off-by: Christopher Clark <christopher.clark@starlab.io> Signed-off-by: Bruce Ashfield <bruce.ashfield@gmail.com>
129 lines
4.5 KiB
Plaintext
129 lines
4.5 KiB
Plaintext
# Enable booting Xen with qemuboot / runqemu: u-boot configuration
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#
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# Copyright (c) 2021-2022 Star Lab Corp. All rights reserved.
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#
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# Author: Christopher Clark <christopher.clark@starlab.io>
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# Interface variables:
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#
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# QB_XEN_U_BOOT_SCR :
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# If this variable is set, this class will generate the u-boot script image file
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# It must be set to the name of the compiled command file that u-boot will tftp
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# from the image deploy directory during boot, currently: "boot.scr.uimg"
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#
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# QB_XEN_CMDLINE_EXTRA :
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# A string to be appended to the default Xen hypervisor boot command line,
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# for supplying Xen boot options.
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# The device tree that this bbclass generates will contain Xen command
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# line options to connect the Xen console to the Qemu serial port.
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#
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# QB_XEN_LOAD_ADDR :
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# The hypervisor load address
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#
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# QB_XEN_DOM0_BOOTARGS :
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# A string for specifying Dom0 boot options for the Xen section of the device
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# tree.
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#
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# QB_XEN_UBOOT_SCR_TASK_DEPENDS:
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# The task dependencies for the u-boot script generation. A default is provided.
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#
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# QB_XEN_DOMAIN_MODULES:
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# A space-separated list of colon-separated entries:
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# "<file for the module>:<load memory address>:<module compatibility string>"
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# Set the default value for this variable to empty: no file generated.
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QB_XEN_U_BOOT_SCR ??= ""
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write_add_chosen_module() {
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CMD_FILE="$1"
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ADDR="$2"
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SIZE="$3"
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MODULE_TYPE="$4"
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cat <<EOF >>"${CMD_FILE}"
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fdt mknod /chosen module@${ADDR}
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fdt set /chosen/module@${ADDR} compatible "multiboot,module" "${MODULE_TYPE}"
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fdt set /chosen/module@${ADDR} reg <${ADDR} ${SIZE}>
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EOF
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}
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generate_xen_u_boot_conf() {
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CMD_FILE="${B}/qemuboot-xen.cmd"
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cat <<EOF >"${CMD_FILE}"
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echo "Running u-boot launch script"
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fdt addr 0x40000000
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fdt resize
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echo "Device tree resized"
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fdt set /chosen \#address-cells <1>
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fdt set /chosen \#size-cells <1>
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fdt set /chosen xen,xen-bootargs "console=dtuart dtuart=/pl011@9000000 ${QB_XEN_CMDLINE_EXTRA}"
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fdt set /chosen xen,dom0-bootargs "${QB_XEN_DOM0_BOOTARGS}"
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EOF
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if [ -z "${QB_XEN_DOMAIN_MODULES}" ]; then
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bbwarn "No domain modules: please set QB_XEN_DOMAIN_MODULES"
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fi
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for DOMAIN_MODULE in ${QB_XEN_DOMAIN_MODULES}
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do
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MODULE_FILE="$(echo ${DOMAIN_MODULE} | cut -f1 -d:)"
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ADDR="$(echo ${DOMAIN_MODULE} | cut -f2 -d:)"
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MODULE_TYPE="$(echo ${DOMAIN_MODULE} | cut -f3 -d:)"
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RESOLVED_FILE="$(readlink -f ${MODULE_FILE})"
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SIZE=$(printf '0x%x\n' $(stat -c '%s' "${RESOLVED_FILE}"))
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[ "x${SIZE}" != "x0x0" ] || bbfatal No module: "${MODULE_FILE}"
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write_add_chosen_module "${CMD_FILE}" "${ADDR}" "${SIZE}" "${MODULE_TYPE}"
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done
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cat <<EOF >>"${CMD_FILE}"
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fdt print /chosen
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echo Boot Xen
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bootz ${QB_XEN_LOAD_ADDR} - 0x40000000
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EOF
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uboot-mkimage -A "${UBOOT_ARCH}" -T script -C none \
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-a 0x20000 -e 0x20000 \
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-d "${CMD_FILE}" "${CMD_FILE}.uimg"
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# u-boot tftps this filename from DEPLOY_DIR_IMAGE:
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install -m 0644 "${CMD_FILE}.uimg" "${DEPLOY_DIR_IMAGE}/${QB_XEN_U_BOOT_SCR}"
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}
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do_write_qemuboot_xen_u_boot_conf() {
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# Not all architectures qemuboot with u-boot, so check to see if this
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# is needed. This allows this bbclass file to be used in the same image
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# recipe for multiple architectures.
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if [ -n "${QB_XEN_U_BOOT_SCR}" ] && [ -n "${QB_SYSTEM_NAME}" ] ; then
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generate_xen_u_boot_conf
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fi
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}
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addtask do_write_qemuboot_xen_u_boot_conf after do_write_qemuboot_conf before do_image
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# Task dependency:
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# An expected common case is that the kernel for at least one of the initial
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# domains (eg. dom0) is deployed from the virtual/kernel recipe, so
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# add that as a task dependency here since the kernel size needs to be known
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# for generating the device tree.
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# Dependencies are only introduced if a device tree will be generated.
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QB_XEN_UBOOT_SCR_TASK_DEPENDS ?= " \
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${@[ ' \
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u-boot-tools-native:do_populate_sysroot \
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u-boot:do_deploy \
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virtual/kernel:do_deploy \
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', ''][d.getVar('QB_XEN_U_BOOT_SCR') == '']} \
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"
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do_write_qemuboot_xen_u_boot_conf[depends] = "${QB_XEN_UBOOT_SCR_TASK_DEPENDS}"
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def qemuboot_xen_u_boot_vars(d):
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build_vars = ['MACHINE', 'TUNE_ARCH', 'DEPLOY_DIR_IMAGE',
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'KERNEL_IMAGETYPE', 'IMAGE_NAME', 'IMAGE_LINK_NAME',
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'STAGING_DIR_NATIVE', 'STAGING_BINDIR_NATIVE',
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'STAGING_DIR_HOST', 'SERIAL_CONSOLES']
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return build_vars + [k for k in d.keys() if k.startswith('QB_')]
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do_write_qemuboot_xen_u_boot[vardeps] += "${@' '.join(qemuboot_xen_u_boot_vars(d))}"
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do_write_qemuboot_xen_u_boot[vardepsexclude] += "TOPDIR"
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