[Xen-devel] [BUG] X86-64 dom0 oops if dom0_mem not specified

[Jerone Young <jyoung5@xxxxxxxxxx>]

>From my observations if you don't pass dom0_mem or you pass dom0_mem
with a value greater that 256000, Dom0 will oops on boot. Here is some
output from the oops:

(XEN) *** LOADING DOMAIN 0 ***
(XEN) Xen-ELF header found:
'GUEST_OS=linux,GUEST_VER=2.6,XEN_VER=3.0,VIRT_BASE'(XEN) PHYSICAL
MEMORY ARRANGEMENT:
(XEN)  Dom0 alloc.:   0000000040000000->0000000080000000 (641881 pages
to be al)(XEN) VIRTUAL MEMORY ARRANGEMENT:
(XEN)  Loaded kernel: ffffffff80100000->ffffffff80516085
(XEN)  Init. ramdisk: ffffffff80517000->ffffffff80517000
(XEN)  Phys-Mach map: ffffffff80517000->ffffffff80889d64
(XEN)  Page tables:   ffffffff8088a000->ffffffff80893000
(XEN)  Start info:    ffffffff80893000->ffffffff80894000
(XEN)  Boot stack:    ffffffff80894000->ffffffff80895000
(XEN)  TOTAL:         ffffffff80000000->ffffffff80c00000
(XEN)  ENTRY ADDRESS: ffffffff80100000
(XEN) Scrubbing Free RAM: ....................................done.
(XEN) *** Serial input -> DOM0 (type 'CTRL-a' three times to switch
input to Xe. Xen: 0000000000000000 - 00000000dcb59000 (usable)
(XEN) BUG at domain.c:136
(XEN) CPU:    0
(XEN) EIP:    0810:[<ffff830000107369>]
(XEN) EFLAGS: 0000000000010292
(XEN) rax: 0000000000000000   rbx: ffff830000fecb80   rcx:
00000000000003f8   r5(XEN) rsi: 000000000000000a   rdi: ffff830000160474
rbp: 00000000dcb59000   r8(XEN) r8:  0000000000000036   r9:
0000000000001996   r10: 0000000000000001   r4(XEN) r12: ffffffff80a95b50
r13: 000000000000016a   r14: 0000000000000001   r8(XEN) Stack trace from
RSP=ffff830000105ee8:
(XEN)     [ffff830000107450] ffff830000fea080 00000000dcb59000
[ffff83000010745
(XEN)     000000000000016a ffffffff80a95b50 00000000dcb59000
ffffffff80c00000 0
(XEN)     0000000000000000 0000000000000000 0000000000000000
0000000000000000 f
(XEN)     0000000000010216 ffffffff80104040 000000000000082b
0000000000000000 0
(XEN)     0000000000000000 0000000000000000 ffff830000fea080
(XEN) Call Trace from RSP=ffff830000105ee8:
(XEN)    [<ffff830000107450>] [<ffff830000107459>] [<ffff830000137596>]

****************************************
CPU0 FATAL TRAP: vector = 6 (invalid operand)
[error_code=0000]
Aieee! CPU0 is toast...
****************************************
-- 
Jerone Young
IBM Linux Technology Center
jyoung5@xxxxxxxxxx
512-838-1157 (T/L: 678-1157)


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