[Xen-devel] Linux as 32-bit Dom0?

["Jan Beulich" <JBeulich@xxxxxxxx>]

Jürgen, Boris,

am I trying something that's not allowed, but selectable via Kconfig?
On system with multiple IO-APICs (I assume that's what triggers the
problem) I get

Kernel panic - not syncing: Max apic_id exceeded!

CPU: 0 PID: 0 Comm: swapper Not tainted 4.14.1-2017-11-21-xen0 #6
Hardware name: ...
Call Trace:
 ? show_stack+0x20/0x50
 ? dump_stack+0x7e/0xc0
 ? panic+0x99/0x220
 ? io_apic_get_unique_id+0x207/0x210
 ? __raw_callee_save_xen_restore_fl+0x6/0x8
 ? xen_flush_tlb_single+0x6f/0x80
 ? set_pte_vaddr+0xef/0x110
 ? xen_io_apic_read+0x36/0x90
 ? mp_register_ioapic+0x2b7/0x410
 ? acpi_os_map_iomem+0x14d/0x210
 ? acpi_parse_ioapic+0x6b/0x6f
 ? acpi_parse_entries_array+0xa1/0x16d
 ? acpi_tb_get_table+0x95/0x9d
 ? acpi_ut_release_mutex+0x109/0x10e
 ? acpi_table_parse_entries_array+0x98/0xa8
 ? acpi_table_parse_entries+0x30/0x35
 ? acpi_boot_init+0x65/0x65
 ? acpi_table_parse_madt+0x1b/0x1f
 ? acpi_boot_init+0x65/0x65
 ? acpi_parse_madt_ioapic_entries+0x4a/0x119
 ? mutex_lock+0x8/0x30
 ? acpi_process_madt+0xbe/0x105
 ? acpi_boot_init+0x3d/0x65
 ? setup_arch+0x67a/0x83f
 ? 0xc1000000
 ? start_kernel+0x46/0x361
 ? x86_early_init_platform_quirks+0x4d/0x90
 ? i386_start_kernel+0x22/0x88
 ? xen_start_kernel+0x453/0x639
(XEN) Hardware Dom0 crashed: 'noreboot' set - not rebooting.

I admit I have a few custom patches in that tree, but I'm reasonably
certain that none of them comes even close to having such an effect.

Jan

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