[XenPPC] Re: what is this about and what do you think happened

[Jimi Xenidis <jimix@xxxxxxxxxxxxxx>]

On Sep 8, 2006, at 10:38 AM, Maria Butrico wrote:

> I had run my domains and killed them and my console was still  
> running.  I
> also have as you know multi patch, your 128m patch and the patch I  
> sent
> this morning to xen-ppc.
>
> I saw this on the machine/xen console (we have so many consoles we  
> need to
> be specific)
>
> (XEN) paddr_to_maddr: Dom:0 paddr: 0xc000000 type: REMOTE
> (XEN) WARN at usercopy.c:62
> (XEN) [000000000000F530] 000000000044C5EC .paddr_to_maddr+0x118/0x1a0
> (XEN) [000000000000F5F0] 000000000044CBC4
> .xencomm_copy_to_guest+0x220/0x2f4
> (XEN) [000000000000F6F0] 00000000004390D8 .arch_do_dom0_op+0x140/0x4c4
> (XEN) [000000000000F810] 0000000000404220 .do_dom0_op+0x193c/0x19b4
> (XEN) [000000000000FC00] 000000000043CE28 .hcall_xen+0xcc/0xfc
> (XEN) [000000000000FC90] 000000000043CF4C .do_hcall+0x54/0x84
> (XEN) [000000000000FD20] 0000000000450348 ex_hcall_continued+0xe4/0xf4
> (XEN) [000000000043B948] 800100017C0802A6
> (XEN) SP (600000004bffffd8) is not in xen space
This was seen before (by another person that did not post to the  
list) and used to be a panic.
I demoted it to a warn, because we are looking for stuff but I don't  
think anything will be done with that address.
Basically, any page not belonging to Dom0 can be mapped by Dom0 be  
cause she's the boss, these pages are either IO or REMOTE (and IO  
will panic).
However, I do not believe we should ever be performing guest copies  
of IO or REMOTE.
0xc000000 is 192M

Hollis, I believe this is an off by one error in the xencomm somewhere.
any ideas?

> kpblade4:/ #
> kpblade4:/ # xm list
> xm list
> /usr/lib/python2.4/xmllib.py:9: DeprecationWarning: The xmllib  
> module is
> obsolete.  Use xml.sax instead.
>   warnings.warn("The xmllib module is obsolete.  Use xml.sax  
> instead.",
> DeprecationWarning)
> Name                              ID Mem(MiB) VCPUs State  Time(s)
> Domain-0                           0      192     1 r-----  5714.2
> kpblade4:/ #
> kpblade4:/ #
>
> The console xmconsole process was still running.  This  
> means ... ?   Never
> seen this before btw and I have seen some strange stuff and run xen
> constantly.
-JX


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