[Xen-devel] Xen 4.12 panic on Thinkpad W540 with UEFI mutiboot2, efi=no-rs workarounds it

[Marek Marczykowski-Górecki <marmarek@xxxxxxxxxxxxxxxxxxxxxx>]

Hi,

Xen 4.12 crashes when booting on UEFI (with multiboot2) unless I disable
runtime services. The crash happens shortly after starting dom0 kernel.
Unfortunately I don't have serial console there, so the only log I have
is a photo of VGA console (attached). Below I retype part of the message:

(XEN) ----[ Xen-4.12.0-3.fc29  x86_64  debug=n   Not tainted ]----
(XEN) CPU:    0
(XEN) RIP:    e008:[<00000000000000f6>] 00000000000000f6
(XEN) RFLAGS: 0000000000010287   CONTEXT: hypervisor (d0v0)
...
(XEN) Xen call trace:
(XEN)    [<00000000000000f6>] 00000000000000f6
(XEN)    [<ffff82d08026c6ad>] flushtlb.c#pre_flush+0x3d/0x80
(XEN)    [                  ] efi_runtime_call+0x493/0xbd0
(XEN)    [                  ] efi_runtime_call+0x441/0xbd0
(XEN)    [                  ] vcpu_restore_fpu_nonlazy+0xe7/0x180
(XEN)    [                  ] do_platform_op+0/0x1880
(XEN)    [                  ] do_platform_op+0xb9c/0x1880
(XEN)    [                  ] do_platform_op+0xb9c/0x1880
(XEN)    [                  ] sched_credit2.c#csched2_schedule+0xcd0/0x13a0
(XEN)    [                  ] lstar_enter+0xae/0x120
(XEN)    [                  ] do_platform_op+0/0x1880
(XEN)    [                  ] pv_hypercall+0x152/0x220
(XEN)    [                  ] lstar_enter+0xae/0x120
(XEN)    [                  ] lstar_enter+0xa2/0x120
(XEN)    [                  ] lstar_enter+0xae/0x120
(XEN)    [                  ] lstar_enter+0xa2/0x120
(XEN)    [                  ] lstar_enter+0xae/0x120
(XEN)    [                  ] lstar_enter+0xa2/0x120
(XEN)    [                  ] lstar_enter+0xae/0x120
(XEN)    [                  ] lstar_enter+0xa2/0x120
(XEN)    [                  ] lstar_enter+0xae/0x120
(XEN)    [                  ] lstar_enter+0xa2/0x120
(XEN)    [                  ] lstar_enter+0xae/0x120
(XEN)    [                  ] lstar_enter+0x10c/0x120
(XEN)
(XEN)
(XEN) *****************************************
(XEN) Panic on CPU 0:
(XEN) FATAL TRAP: vector = 0 (divide error)
(XEN) [error_code=0000]
(XEN) *****************************************

Any idea? Lack of serial console doesn't help with collecting logs...

-- 
Best Regards,
Marek Marczykowski-Górecki
Invisible Things Lab
A: Because it messes up the order in which people normally read text.
Q: Why is top-posting such a bad thing?

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