Xen devel - Oct 2012 - [PATCH 0/1] fix xen-crash at panic()-call during boot

Xen is crashing for me since version 4.1.3 during boot on a AMD machine.

This happens since patch "x86-64: detect processors subject to AMD erratum 
#121 and refuse to boot."

Instead of the actual panic-message from the patch the following stacktrace 
appears (i typed it down from screen, so it might contain typos)


find_iommu_for_device
amd_iommu_ioapic_update_ire
timer_interrupt
enable_8259_A_irq
do_IRQ
printk_start_of_line
acpi_os_printf
io_apic_write
__ioapic_write_entry
ioapic_write_entry
__clear_IO_APIC_pin
clear_IO_APIC
disable_IO_APIC
__stop_this_cpu
smp_send_stop
machine_restart
panic
tasklet_schedule_on_cpu
display_cacheinfo
init_amd
generic_identify
identify_cpu
_start_xen
_high_start

Panic on CPU 0:
Xen BUG at pci_amd_iommu.c:33

====
The patch in the next mail fixes the problem for me and the intended panic-
message appears.