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Arm EFI boot issue for Dom0 module listed inside subnode of chosen
- To: Xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Luca Fancellu <luca.fancellu@xxxxxxx>
- Date: Tue, 2 Nov 2021 17:24:59 +0000
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- Cc: Julien Grall <julien@xxxxxxx>, Bertrand Marquis <bertrand.marquis@xxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, wei.chen@xxxxxxx
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Hi all,
We recently discovered that there is a way to list Dom0 modules that is not
supported by the EFI boot,
It’s happened browsing some Wiki pages like this one:
https://wiki.xenproject.org/wiki/Xen_ARM_with_Virtualization_Extensions/Lager
In that page the Dom0 modules are listed inside a subnode of the /chosen node:
chosen {
modules {
#address-cells = <1>;
#size-cells = <1>;
module@0x72000000 {
compatible = "multiboot,kernel", "multiboot,module";
reg = <0x72000000 0x2fd158>;
};
module@0x74000000 {
compatible = "xen,xsm-policy", "multiboot,module";
reg = <0x74000000 0x2559>;
};
};
};
Instead for how it is implemented now in the EFI code and described in:
1) https://xenbits.xen.org/docs/unstable/misc/arm/device-tree/booting.txt
2) https://xenbits.xen.org/docs/unstable/misc/efi.html
Only the following approach is supported, so Dom0 modules must be a direct
child of /chosen:
chosen {
#address-cells = <1>;
#size-cells = <1>;
module@0x72000000 {
compatible = "multiboot,kernel", "multiboot,module";
reg = <0x72000000 0x2fd158>;
};
module@0x74000000 {
compatible = "xen,xsm-policy", "multiboot,module";
reg = <0x74000000 0x2559>;
};
};
Is this a problem that needs a fix?
Thank you.
Cheers,
Luca
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