Re: [Xen-devel] Intel VT-d Support

[Igor Chubin <igor@xxxxxxx>]

Thank you for answers, 

On Mi, MÃr 05, 2008 at 09:00:30 +0800, Li, Haicheng wrote:
> Igor Chubin wrote:
> > Hello all,
> > 
> > 
> > please tell me, how can I be sure that
> > my Xen installation is built with Intel VT-d support?
> > 
> > Something like
> > 
> > xm info | grep -i KEY-REGULAR-EXPRESSION
> > xm dmesg | grep -i KEY-REGULAR-EXPRESSION
> 
> Use "xm dmesg | grep -i vt-d".


There are no strings found
even with VT-d enabled in BIOS.

# xm dmesg | grep vt
# xm dmesg | grep -i vt 


How can I check if Xen-code was built with 
VT-d support? 

(I have tried to use VT-d on precompiled Debian binaries of Xen 3.2
and on xen-unstable with default build options)

> 
> > 
> > What a line should I look for?
> 
> Find the line "Intel VT-d has been enabled."


So this line must be shown in xm dmesg.
Thank you.

No I must find the reason why there no such a line.


>  
> > And if my installation was really built with VT-d support,
> > how can I be sure, that Xen has successfully
> > initialized VT-d hardware?
> 
> Try assigning a pci device to hvm guest as [1] describes. If vt-d is not
> enabled or the device is not hidden, the guest creation will fail.
> otherwise, you can use `lspci` in the guest to find out the device
> assigned.


Yes, guest creation fails with the message:

# xm create win2k3_clone

Using config file "/etc/xen/win2k3_clone".
Error: Fail to assign device(7:9.0): maybe VT-d is not enabled, or
the device is not exist, or it has already been assigned to other
domain


For pv domains all works fine.

> 
> > I have read [1] and the lists archives
> > and found no answers for my question.
> > 
> > 
> > 
> > Thank you in advance.
> > 
> > 
> > 
> > [1] http://wiki.xensource.com/xenwiki/VTdHowTo
> 
> 
> 
> -- haicheng

-- 
WBR, i.m.chubin


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