[Xen-ia64-devel] Xen panic if not initializing SHARED_INFO_VA

[Dietmar Hahn <dietmar.hahn@xxxxxxxxxxxxxxxxxxx>]

Hi,

I after a month I updated to the current cset (12018:11b718eb22c9) for porting 
the mini-os and xen did a panic.
I tracked the problem down to:
- I did not initializing SHARED_INFO_VA (see early_xen_setup() for linux)
- the next access to the shared info area leads to a
  alternate data tlb trap:
    shared_info_t *HYPERVISOR_shared_info = (shared_info_t *)XSI_BASE;
    ...
    pfn = HYPERVISOR_shared_info->arch.start_info_pfn

My trap handler inserts a tlb entry for all region 7 addresses without
any checks (and addresses 0xf.... are region 7 addresses too).
Therewidth it installs tlb entries for the shared info pages.
Later the hypervisor panics - see below.
Thanks.

Dietmar.


 (XEN) ### domain f000000007d9c080: rid=80000-c0000 mp_rid=2000
(XEN) arch_domain_create: domain=f000000007d9c080
(XEN) DomainU EFI build up: ACPI 2.0=0x1000
(XEN) dom mem: type=13, attr=0x8000000000000008, 
range=[0x0000000000000000-0x0000000000001000) (4KB)
(XEN) dom mem: type=10, attr=0x8000000000000008, 
range=[0x0000000000001000-0x0000000000002000) (4KB)
(XEN) dom mem: type= 6, attr=0x8000000000000008, 
range=[0x0000000000002000-0x0000000000003000) (4KB)
(XEN) dom mem: type= 7, attr=0x0000000000000008, 
range=[0x0000000000003000-0x0000000007ff4000) (127MB)
(XEN) dom mem: type=12, attr=0x0000000000000001, 
range=[0x00000ffffc000000-0x0000100000000000) (64MB)
(XEN) lookup_domain_mpa: d 0xf000000007d9c080 id 6 current 0xf000000007db8000 
id 0
(XEN) lookup_domain_mpa: bad mpa 0x3fffffff01010 (=> 0x8000000)
(XEN) ia64_fault, vector=0x18, ifa=0xfffffffffff01010, iip=0xf0000000040451c0, 
ipsr=0x0000121008226018, isr=0x0000008000000030
(XEN) General Exception: IA-64 Reserved Register/Field fault (data access).
(XEN) d 0xf000000007d9c080 domid 6
(XEN) vcpu 0xf000000007db8000 vcpu 0
(XEN) 
(XEN) CPU 1
(XEN) psr : 0000121008226018 ifs : 8000000000000713 ip  : [<f0000000040451c1>]
(XEN) ip is at printk+0x421/0x530
(XEN) unat: 0000000000000000 pfs : 0000000000000592 rsc : 0000000000000003
(XEN) rnat: 0009804c8a70033f bsps: f000000004122cc9 pr  : 00000000000182a9
(XEN) ldrs: 0000000000000000 ccv : 0000000000000000 fpsr: 0009804c8a70033f
(XEN) csd : 0000000000000000 ssd : 0000000000000000
(XEN) b0  : f00000000406cd80 b6  : f000000004063020 b7  : 0000000000000000
(XEN) f6  : 0fffafffffffff0000000 f7  : 0ffde8000000000000000
(XEN) f8  : 100028000000000000000 f9  : 100038000000000000000
(XEN) f10 : 0fffdfffffffff0000000 f11 : 1003e0000000000000000
(XEN) r1  : f000000004317050 r2  : f100000000000000 r3  : f000000007dbffe8
(XEN) r8  : 001c000000000561 r9  : 0000000000000000 r10 : 0000000000000000
(XEN) r11 : 0009804c0270033f r12 : f000000007dbfdc0 r13 : f000000007db8000
(XEN) r14 : 0000000000000000 r15 : 0000001008226018 r16 : f000000007d9c080
(XEN) r17 : 0000000000004000 r18 : f000000004117f68 r19 : f0000000042a4080
(XEN) r20 : 03c6808080000002 r21 : 0000000003c68080 r22 : 000000001fffffff
(XEN) r23 : 0000000000000000 r24 : f000000007dbfe20 r25 : f000000007dbfe28
(XEN) r26 : 0000000000000000 r27 : 0000000000000000 r28 : 0000000000000000
(XEN) r29 : 0000000000000000 r30 : 0000000000000000 r31 : f000000004125c70
(XEN) 
(XEN) Call Trace:
(XEN)  [<f000000004095680>] show_stack+0x80/0xa0
(XEN)                                 sp=f000000007dbf9f0 bsp=f000000007db9018
(XEN)  [<f000000004065ca0>] ia64_fault+0x130/0x4f0
(XEN)                                 sp=f000000007dbfbc0 bsp=f000000007db8fd8
(XEN)  [<f000000004092680>] ia64_leave_kernel+0x0/0x310
(XEN)                                 sp=f000000007dbfbc0 bsp=f000000007db8fd8
(XEN)  [<f0000000040451c0>] printk+0x420/0x530
(XEN)                                 sp=f000000007dbfdc0 bsp=f000000007db8f40
(XEN)  [<fffffffffff00000>] ???
(XEN)                                 sp=f000000007dbfe00 bsp=f000000007db8e40
(XEN) 
(XEN) ****************************************
(XEN) Panic on CPU 1:
(XEN) Fault in Xen.
(XEN) ****************************************
(XEN) 
(XEN) Reboot in five seconds...

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