Re: [Xen-devel] Some trouble to use NVIDIA CUDA with Xen

[Martin Cerveny <martin@xxxxxxxxx>]

Hello.

Any progress on this topics ?
What is the blocker to run correctly NVIDIA (proprietary) drivers in kernel in 
XEN/Dom0 ?

The problem still persit:

- CUDA "deviceQuery" run and exit without error (BUT with xen after 9sec, 
without xen after 1sec)
- CUDA other programs for example "bandwidthTest" exit with error 
"code=46(cudaErrorDevicesUnavailable)"

Test environment:

- fedora18
- kernel 3.9.11-200.fc18.x86_64
- nvidia drivers 319.37 (comes with CUDA)
- nvidia CUDA 5.5
- XEN 4.2.2 and directly from git repo 4.4.unstable (commit 
73f18583dd824f0e49f65149ef603600ce31b8ee)
- AMD Athlon(tm) 64 X2 Dual Core Processor 5600+

Attached files:

- output from dmesg, deviceQuery (with /bin.time), bandwidthTest (with 
/bin/time), lspci -vvv

Hypotehesis:

- PCI output are the same - probably no problem
- dmesg differences ( diff dmesg_boot_without_xen_wt.txt 
dmesg_boot_xen_44u_wt.txt )

======================
without XEN:

< MTRR default type: uncachable
< MTRR fixed ranges enabled:
<   00000-9FFFF write-back
<   A0000-EFFFF uncachable
<   F0000-FFFFF write-protect
< MTRR variable ranges enabled:
<   0 base 0000000000 mask FF80000000 write-back
<   1 base 0080000000 mask FFC0000000 write-back
<   2 disabled
<   3 disabled
<   4 disabled
<   5 disabled
<   6 disabled
<   7 disabled
< x86 PAT enabled: cpu 0, old 0x7040600070406, new 0x7010600070106

======================
with XEN:

> NVRM: PAT configuration unsupported.
======================

The MTRR+PAT is not supported (still) in kernel in XEN/dom0 ?
Maybe MTRR+PAT is needed for CUDA too.

Is there any workaround for linux kernels ~ 3.9.x and xen ~ v4.x.x ?

Thanks, Martin Cerveny

Refs:

[Xen-devel] XEN MTRR -  
http://lists.xen.org/archives/html/xen-devel/2012-06/msg00194.html
[Xen-users] Xen and nvidia - 
http://lists.xen.org/archives/html/xen-users/2013-01/msg00169.html

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