On Friday, December 27, 2019 at 12:41:35 AM UTC-8, awokd wrote:
>
> See if you can turn off the HPET timer in your UEFI config, and include 
> that "apic_verbosity=debug" option. That might make more combinations 
> available to Xen and provide more detail.
>
 
I wasn't sure where to put the hpet=disable line, but my UEFI options line 
now looks like this:
```
options=console=vga loglvl=all efi=no-rs hpet=disable apic_verbosity=debug
```

And the boot output looks like this:
```
(XEN) [...]
(XEN) CPU0: No irq handler for vector 40 (IRC -2147483648, LAPIC)
(XEN) PCI: MCFG configuration 0: base e0000000 segment 0000 buses 00 - ff
(XEN) PCI: Not using MCFG for segment 0000 bus 00-ff
(XEN) Intel VT-d iommu 0 supported page sizes: 4kB, 2MB, 1GB.
(XEN) Intel VT-d iommu 1 supported page sizes: 4kB, 2MB, 1GB.
(XEN) Intel VT-d Snoop Control not enabled.
(XEN) Intel VT-d Dom0 DMA Passthrough not enabled.
(XEN) Intel VT-d Queued Invalidation enabled.
(XEN) Intel VT-d Posted Interrupt not enabled.
(XEN) Intel VT-d Shared EPT tables enabled.
(XEN) I/O virtualization enabled.
(XEN)  - Dom0 mode: Relaxed
(XEN) Interrupt remapping enabled
(XEN) nr_sockets: 2
(XEN) Getting VERSION: 1060015
(XEN) Getting VERSION: 1060015
(XEN) Enabled directed EOI with ioapic_ack_old on!
(XEN) Getting ID: 0
(XEN) Getting LVT0: 700
(XEN) Getting LVT1: 400
(XEN) Suppress EOI broadcast on CPU#0
(XEN) enabled ExtINT on CPU#0
(XEN) ENABLING IO_APIC IRQs
(XEN)  -> Using old ACK method
(XEN) init IO_APIC IRQs
(XEN)  IO-APIC (apicid-pin) 2-0, 2-16, 2-17, 2-18, 2-19, 2-20, 2-21, 2-22, 
2-23, 2-24, 2-25, [...], 2-115, 2-116, 2-117, 2-118, 2-119 not connected.
(XEN) ..TIMER: vector=0xF0 apic1=0 pin1=2 apic2=-1 pin2=-1
(XEN) ..MP-BIOS bug: 8254 timer not connected to IO-APIC
(XEN) ...trying to set up timer (IRQ0) through 8259A ,,,
(XEN) ...trying to set up timer as Virtual Wire IRQ... failed.
(XEN) ...trying to set up timer as ExtINT IRQ...spurious 8259A interrupt: 
IRQ7.
(XEN) CPU0: no irq handler for vector e7 (IRQ -8)
(XEN) IRQ7 a=0001[0001,0000] v=60[ffffffff] t=IO-APIC-edge s=00000002
(XEN)  failed :(.
(XEN)
(XEN) ***************************************
(XEN) Panic on CPU 0:
(XEN) IO-APIC + timer doesn't work! Boot with apic_verbosity=debug and send 
a report.  Then try booting with the 'noapic' option
(XEN) ***************************************
(XEN)
(XEN) Reboot in five seconds... 
```

Thanks!

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