Hi Jan Beulich, 
> changeset 15414: 3cf5052ba5e5  x86:
machine check exception handling
With the c/s, when creating HVM
guest, I can only see a white Qemu window. :(
Can you have a look? Thanks.
 
PS: the serial log follows:
(XEN) HVM1: pci dev 02:0 bar 14 size
00001000: f2000000
(XEN) HVM1: pci dev 03:0 bar 10 size
00000100: 0000c101
(XEN) HVM1: pci dev 03:0 bar 14 size
01000000: f3000008
(XEN) HVM1: pci dev 03:0
INTA->IRQ11
(XEN) HVM1: pci dev 04:0 bar 10 size
00000100: 0000c201
(XEN) HVM1: pci dev 04:0 bar 14 size
00000100: f4000000
(XEN) HVM1: pci dev 04:0
INTA->IRQ5
(XEN) HVM1: Creating MP tables ...
(XEN) HVM1: Loading Cirrus VGABIOS
...
(XEN) HVM1: Loading ACPI ...
(XEN) HVM1: BIOS map:
(XEN) HVM1:  c0000-c8003: VGA
BIOS
(XEN) HVM1:  d0000-d5603:
VMXAssist
(XEN) HVM1:  e9000-e916a: SMBIOS
tables
(XEN) HVM1:  ea000-eb0ef: ACPI
tables
(XEN) HVM1:  f0000-fffff: Main
BIOS
(XEN) HVM1: Loading VMXAssist ...
(XEN) HVM1: VMX go ...
(XEN) HVM1: VMXAssist (Jun 24 2007)
(XEN) HVM1: Memory size 511 MB
(XEN) HVM1: E820 map:
(XEN) HVM1: 0000000000000000 -
000000000009FC00 (RAM)
(XEN) HVM1: 000000000009FC00 -
00000000000A0000 (Reserved)
(XEN) HVM1: 00000000000E0000 -
0000000000100000 (Reserved)
(XEN) HVM1: 0000000000100000 -
000000001FFFAC00 (RAM)
(XEN) HVM1: 000000001FFFAC00 -
0000000020000000 (Reserved)
(XEN) HVM1:
(XEN) HVM1: Trap (0xD) while in
protected mode
(XEN) HVM1:
eax         651
ecx      100350
edx           0
ebx       FFFFF
(XEN) HVM1:
esp       D74CC
ebp       D74F8
esi       EA000
edi       D9904
(XEN) HVM1:
trapno        D
errno         0
(XEN) HVM1:
eip       D3538 cs          
10 eflags        2
(XEN) HVM1:
uesp          0
uss           0
(XEN) HVM1:
ves           0
vds           0
vfs           0
vgs           0
(XEN) HVM1:
cr0           0
cr2           0
cr3           0
cr4           0
(XEN) HVM1:
(XEN) HVM1: Halt called from %eip
0xD037C
 
-- Dexuan