Linux dom0 hangs on boot with Xen 4.22 and Heads firmware

[Marek Marczykowski-Górecki <marmarek@xxxxxxxxxxxxxxxxxxxxxx>]

Hi,

After updating Xen to 4.22-rc2 on a system with Heads firmware, dom0
doesn't start anymore. It worked fine with Xen 4.19.
The last messages on console are:

    [    1.495140] installing Xen timer for CPU 2
    [    1.496149] installing Xen timer for CPU 4
    [    1.496587] installing Xen timer for CPU 5
    [    1.496809] installing Xen timer for CPU 7
    [    0.008235] [Firmware Bug]: CPU   2: APIC ID mismatch. CPUID: 0x0002 
APIC: 0x0028
    [    0.008235] [Firmware Bug]: CPU   2: APIC ID mismatch. Firmware: 0x0011 
APIC: 0x0028
    [    1.497055] cpu 2 spinlock event irq 200
    [    0.008235] [Firmware Bug]: CPU   4: APIC ID mismatch. CPUID: 0x0004 
APIC: 0x0000
    [    0.008235] [Firmware Bug]: CPU   4: APIC ID mismatch. Firmware: 0x0019 
APIC: 0x0000
    [    1.497074] cpu 4 spinlock event irq 201
    [    0.008235] [Firmware Bug]: CPU   5: APIC ID mismatch. CPUID: 0x0005 
APIC: 0x0002
    [    0.008235] [Firmware Bug]: CPU   5: APIC ID mismatch. Firmware: 0x0021 
APIC: 0x0002
    [    1.497074] cpu 5 spinlock event irq 202
    [    0.008235] [Firmware Bug]: CPU   7: APIC I

Full console log (containing both successful boot of Xen 4.19, and then
reboot into 4.22):
https://openqa.qubes-os.org/tests/184780/logfile?filename=serial0.txt

It doesn't reach loading graphics driver in dom0, so I don't have
anything interesting on VGA (the last output is about the kexec call
done by Heads). But at least I have a serial console.

This happens both on older Thinkpad t430 (Ivy Bridge), and newer Novacustom V54 
(ADL).

-- 
Best Regards,
Marek Marczykowski-Górecki
Invisible Things Lab

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