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Re: [Xen-devel] Re: [Xen-users] Nested Virtualisation question

To: Keir Fraser <keir.xen@xxxxxxxxx>
Subject: Re: [Xen-devel] Re: [Xen-users] Nested Virtualisation question
From: Jeroen Groenewegen van der Weyden <groen692@xxxxxxxxx>
Date: Sat, 09 Apr 2011 12:18:07 +0200
Cc: "Christoph.Egger@xxxxxxx" <Christoph.Egger@xxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>, Tim Deegan <Tim.Deegan@xxxxxxxxxx>
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The HAP is default set to one, I check this also with a dry run.
Please confirm all this support just amd, because I only have Intel overhere.


Op 9-4-2011 8:22, Keir Fraser schreef:
On 09/04/2011 06:07, "Jeroen Groenewegen van der Weyden"
<groen692@xxxxxxxxx>  wrote:

The result with c/s23197

Regular domain now start, en stop normaly, (xl seems to have a problem
though, after domain closes a domain null remains in de xl list/ xmdoe
not have this.)
for nestedVM I added the "nestedhvm=1" in the config file of the domain.
but the domain does not start because of "invalid argument"
NestedHVM currently requires you to be using an AMD processor with hardware
nested paging (known as HAP by Xen). Most likely you need to add hap=1 to
your config file (and hope your processor supports it).

  -- Keir

+++++++++ beging console
hydra:/etc/xen/vm # xm create groscNestedVM
Using config file "./groscNestedVM".
Error: (22, 'Invalid argument')
+++++++++ end console

+++++++++ begin xend.log
hydra:/etc/xen/vm # tail /var/log/xen/xend.log
      dominfo = XendDomainInfo.create(config)
    File "/usr/lib64/python2.7/site-packages/xen/xend/XendDomainInfo.py",
line 106, in create
    File "/usr/lib64/python2.7/site-packages/xen/xend/XendDomainInfo.py",
line 473, in start
      XendTask.log_progress(0, 30, self._constructDomain)
    File "/usr/lib64/python2.7/site-packages/xen/xend/XendTask.py", line
209, in log_progress
      retval = func(*args, **kwds)
    File "/usr/lib64/python2.7/site-packages/xen/xend/XendDomainInfo.py",
line 2598, in _constructDomain
      xc.hvm_set_param(self.domid, HVM_PARAM_NESTEDHVM, long(nestedhvm))
Error: (22, 'Invalid argument')
+++++++++++ end xend.log

Op 7-4-2011 12:29, Tim Deegan schreef:
At 08:14 +0100 on 07 Apr (1302164093), Keir Fraser wrote:
On 07/04/2011 08:09, "Keir Fraser"<keir.xen@xxxxxxxxx>   wrote:
Probably the same as this, happening often in the automated tests:
Likely reason: nestedhvm_vcpu_initialise() being called unconditionally in
hvm_vcpu_initialise() even though nestedhvm has not been configured for this
domain. This then fails because there is no nestedhvm handler for Intel yet.
This bug should be fixed by 23175:e5a750d1bf9b, arriving at a staging
tree near you at any moment.

And beyond that it's most likely an issue of a broken failure path, or a
problem in the HAP code with cleaning up a half-created guest.
This one I'll look into now.


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