Re: [9fans] Xen and new venti

[stella]

Hi,
>this sounds like the problem seen on real hardware a few months ago.
>the problem was that the kernel plus the page tables didn't fit in the
>temporary page tables set up in l.s.

I removed quite everything... now the kernel is 1113244 byte in the non-gzipped 
version but 
the problem persist

S.

Re: [9fans] Xen and new venti

[erik quanstrom]

> I tryed both compiling the kernel with xen 3.2.0 and xen 3.0.2 include files 
> with the same result
> I've debugging active on xen so I will paste at the end what happens
> In any case it's odd that the kernels from /n/sources/xen/xen3 boots smoothly 
> on xen 3.2.0
> [without venti of course ] while the others do not.

this sounds like the problem seen on real hardware a few months ago.
the problem was that the kernel plus the page tables didn't fit in the
temporary page tables set up in l.s.

it may be that there's another bug in there.  the easiest way to check
would be to see if there aren't devices you aren't useing and eliminate
them from your xencpuf configuration.  stripping venti will also
make your kernel smaller.  to do this, comment out this line in
port/mkportall

if(~ $"t *executable* && ! ~ $name venti)

if reducing the size of the kernel solves the problem, then i think it's
a good bet, the original problem is not completely solved.

- erik

Re: [9fans] Xen and new venti

[stella]

Hi,
Frist of all a note for erik: 
>> I had a problem of type in xendat.h fixed by replacing 
>> uint8 with uint at line 1540

>i suspect you mean uchar.  (or uvlong if they're counting 
>bytes.)
I meant uint [or so I remember] but I can't give any explanation for this

I tryed both compiling the kernel with xen 3.2.0 and xen 3.0.2 include files 
with the same result
I've debugging active on xen so I will paste at the end what happens
In any case it's odd that the kernels from /n/sources/xen/xen3 boots smoothly 
on xen 3.2.0
[without venti of course ] while the others do not.
 
Sorry if the following paste is not polite

S.

PS: I have no Xen 3.0.2 to test the kernel with but I'm willing to give it to 
anyone who does.

Booting a fresh built 9xenpcf.gz Xend says:

[2008-03-05 01:04:46 3685] DEBUG (XendDomainInfo:84) 
XendDomainInfo.create([\047vm\047, [\047name\047, \047plan9-noventi-new\047], 
[\047memory\047, 96], [\047on_crash\047, \047preserve\047], [\047vcpus\047, 1], 
[\047on_xend_start\047, \047ignore\047], [\047on_xend_stop\047, 
\047ignore\047], [\047image\047, [\047linux\047, [\047kernel\047, 
\047/mnt/allanon/hdb3/xen/plan9/9xenpcf.gz\047], [\047args\047, 
\047\nbootargs=local!#S/sd00/fossil\n\047]]], [\047device\047, [\047vbd\047, 
[\047uname\047, \047file:/mnt/allanon/hdb3/xen/plan9/plan9-noventi.img\047], 
[\047dev\047, \047sda\047], [\047mode\047, \047w\047]]], [\047device\047, 
[\047vif\047, [\047mac\047, \047aa:00:10:00:00:10\047)
[2008-03-05 01:04:46 3685] DEBUG (XendDomainInfo:1608) 
XendDomainInfo.constructDomain
[2008-03-05 01:04:46 3685] DEBUG (balloon:132) Balloon: 99244 KiB free; need 
2048; done.
[2008-03-05 01:04:46 3685] DEBUG (XendDomain:443) Adding Domain: 59
[2008-03-05 01:04:46 3685] DEBUG (XendDomainInfo:1692) 
XendDomainInfo.initDomain: 59 256
[2008-03-05 01:04:46 3685] DEBUG (XendDomainInfo:1724) 
_initDomain:shadow_memory=0x0, memory_static_max=0x600, 
memory_static_min=0x0.
[2008-03-05 01:04:46 3685] DEBUG (balloon:132) Balloon: 99244 KiB free; need 
98304; done.
[2008-03-05 01:04:46 3685] INFO (image:139) buildDomain os=linux dom=59 vcpus=1
[2008-03-05 01:04:46 3685] DEBUG (image:351) domid  = 59
[2008-03-05 01:04:46 3685] DEBUG (image:352) memsize= 96
[2008-03-05 01:04:46 3685] DEBUG (image:353) image  = 
/mnt/allanon/hdb3/xen/plan9/9xenpcf.gz
[2008-03-05 01:04:46 3685] DEBUG (image:354) store_evtchn   = 1
[2008-03-05 01:04:46 3685] DEBUG (image:355) console_evtchn = 2
[2008-03-05 01:04:46 3685] DEBUG (image:356) cmdline= 
bootargs=local!#S/sd00/fossil

[2008-03-05 01:04:46 3685] DEBUG (image:357) ramdisk= 
[2008-03-05 01:04:46 3685] DEBUG (image:358) vcpus  = 1
[2008-03-05 01:04:46 3685] DEBUG (image:359) features   = 
[2008-03-05 01:04:46 3685] INFO (XendDomainInfo:1504) createDevice: vbd : 
{\047uuid\047: \047df218b35-05a8-72c7-5bc9-aad542df2721\047, \047bootable\047: 
1, \047driver\047: \047paravirtualised\047, \047dev\047: \047sda\047, 
\047uname\047: \047file:/mnt/allanon/hdb3/xen/plan9/plan9-noventi.img\047, 
\047mode\047: \047w\047}
[2008-03-05 01:04:46 3685] DEBUG (DevController:117) DevController: writing 
{\047virtual-device\047: \0472048\047, \047device-type\047: \047disk\047, 
\047protocol\047: \047x86_32-abi\047, \047backend-id\047: \0470\047, 
\047state\047: \0471\047, \047backend\047: 
\047/local/domain/0/backend/vbd/59/2048\047} to 
/local/domain/59/device/vbd/2048.
[2008-03-05 01:04:46 3685] DEBUG (DevController:119) DevController: writing 
{\047domain\047: \047plan9-noventi-new\047, \047frontend\047: 
\047/local/domain/59/device/vbd/2048\047, \047uuid\047: 
\047df218b35-05a8-72c7-5bc9-aad542df2721\047, \047dev\047: \047sda\047, 
\047state\047: \0471\047, \047params\047: 
\047/mnt/allanon/hdb3/xen/plan9/plan9-noventi.img\047, \047mode\047: \047w\047, 
\047online\047: \0471\047, \047frontend-id\047: \04759\047, \047type\047: 
\047file\047} to /local/domain/0/backend/vbd/59/2048.
[2008-03-05 01:04:46 3685] INFO (XendDomainInfo:1504) createDevice: vif : 
{\047mac\047: \047aa:00:10:00:00:10\047, \047uuid\047: 
\04798f63ee9-c9dc-1749-de75-d2438bd58ccf\047}
[2008-03-05 01:04:46 3685] DEBUG (DevController:117) DevController: writing 
{\047mac\047: \047aa:00:10:00:00:10\047, \047handle\047: \0470\047, 
\047protocol\047: \047x86_32-abi\047, \047backend-id\047: \0470\047, 
\047state\047: \0471\047, \047backend\047: 
\047/local/domain/0/backend/vif/59/0\047} to /local/domain/59/device/vif/0.
[2008-03-05 01:04:46 3685] DEBUG (DevController:119) DevController: writing 
{\047domain\047: \047plan9-noventi-new\047, \047handle\047: \0470\047, 
\047uuid\047: \04798f63ee9-c9dc-1749-de75-d2438bd58ccf\047, \047script\047: 
\047/etc/xen/scripts/vif-bridge\047, \047state\047: \0471\047, 
\047frontend\047: \047/local/domain/59/device/vif/0\047, \047mac\047: 
\047aa:00:10:00:00:10\047, \047online\047: \0471\047, \047frontend-id\047: 
\04759\047} to /local/domain/0/backend/vif/59/0.
[20

Re: [9fans] Xen and new venti

[erik quanstrom]

> I can't see why this should have been necessary - libc contains memcpy
> already.  I have just updated /n/sources/xen/xen3 so it compiles with
> the current Plan 9 kernel source (using Xen 3.0.2).  I made the other
> changes you listed, but I didn't have to do anything about memcpy.

the reason it's necessary is that although the kernel links against the
c library, it does not include libc.h.  this is very much on purpose as
not every function in libc is safe for use in the kernel.

in this case, the definition for memcpy was likely not picked up in
portfns.h so the linker couldn't find the proper function.

- erik

Re: [9fans] Xen and new venti

[Richard Miller]

> Hi,
> thanks to the suggestion erik gave me I was able to compile the kernel:
> I just needed to switch from memcpy to memmove into /sys/src/libip/parseip.c 
> and recompile libip
> and then recompile also /sys/src/libc

I can't see why this should have been necessary - libc contains memcpy
already.  I have just updated /n/sources/xen/xen3 so it compiles with
the current Plan 9 kernel source (using Xen 3.0.2).  I made the other
changes you listed, but I didn't have to do anything about memcpy.

> I moved the kernels to the Xen machine but all of them crashes just after the 
> message 
> "Started domain plan9"
> 
> Am I missing something?

The present Plan 9 xen kernel works with Xen 3.0.x; you said you are using Xen 
3.2.0.
Xen is not known for the consistency of its interfaces from one release to the
next, so it is quite possible that some rewriting needs to be done on the Plan 9
side to deal with changes in Xen semantics.

Have you enabled verbose debugging messages on the Xen console?  You should see
some indication of why the plan9 guest crashed.

Re: [9fans] Xen and new venti

[stella]

Hi,
thanks to the suggestion erik gave me I was able to compile the kernel:
I just needed to switch from memcpy to memmove into /sys/src/libip/parseip.c 
and recompile libip
and then recompile also /sys/src/libc

I moved the kernels to the Xen machine but all of them crashes just after the 
message 
"Started domain plan9"

Am I missing something?
S.

Re: [9fans] Xen and new venti

[erik quanstrom]

> I'm trying to install plan9 under Xen 3.2.0 with venti
> but the kernel avaiable on the web is too old to support nventi.

perhaps you mean that this kernel has an old venti linked in?

> I had a problem of type in xendat.h fixed by replacing 
> uint8 with uint at line 1540

i suspect you mean uchar.  (or uvlong if they're counting 
bytes.)

> mk now gives two errors which I do not know how to fix:
> ...omissis...
> size 9xenpcf
> v4parsecidr: undefined: memcpy in v4parsecidr

replace memcpy with memmove.

> _strayintrx: _ctype: not defined

_ctype is used by the is* functions like isascii.

- erik