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xen: Disable PCI on qemuarm with Xen

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Remove the pci node from the qemu device tree when runqemu is used with
xen-qemuboot.

Linux is ending up in an infinite loop when trying to access PCI
configuration space when running on top of Xen on arm32.
As we do not need or support any of the devices on PCI on arm32 at the
moment, just remove the node from the device tree generated by qemu.

The problem does not appear at the moment without Xen and it is unclear
why it is with Xen.
This will be investigated but in the meantime provide a working
configuration for users.

Signed-off-by: Bertrand Marquis <bertrand.marquis@arm.com>
Signed-off-by: Bruce Ashfield <bruce.ashfield@gmail.com>
This commit is contained in:
Bertrand Marquis 2022-05-10 16:35:16 +01:00 committed by Bruce Ashfield
parent b5b3fcf492
commit fb0a7b97db
1 changed files with 22 additions and 0 deletions
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22
classes/qemuboot-xen-dtb.bbclass
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@ -63,6 +63,21 @@ write_lops_xen_section() {
EOF
}
write_lop_rm_pci() {
cat <<EOF >"$1"
/dts-v1/;
/ {
compatible = "system-device-tree-v1";
lops {
lop_1 {
compatible = "system-device-tree-v1,lop,modify";
modify = "/pcie@10000000::";
};
};
};
EOF
}
write_lop_add_to_xen_cmdline() {
EXTRA_XEN_BOOTARGS="$2"
cat <<EOF >"$1"
@ -135,6 +150,13 @@ generate_xen_qemuboot_dtb() {
write_lop_add_to_xen_cmdline "${B}/lop-xen-cmdline.dts" \
"${QB_XEN_CMDLINE_EXTRA}"
# On Qemu Arm32, Dom0 accessing PCI config space ends up in an
# infinite loop. Remove pci node from the device tree
if [ "${MACHINE}" = "qemuarm" ]; then
write_lop_rm_pci "${B}/lop-rm-pci.dts"
LOP_MODULE_ARGS="${LOP_MODULE_ARGS} -i ${B}/lop-rm-pci.dts"
fi
if [ -z "${QB_XEN_DOMAIN_MODULES}" ]; then
bbwarn "No domain modules: please set QB_XEN_DOMAIN_MODULES"
fi