Xen users - May 2007 - Ubuntu domU install on hvm goes blank screen

I''ve searched the archive for this subject and hit a couple of
messages, but
none gave any definitive answer, either a solution or no-way.

Looks like I have to install on real hardware and copy disk afterwards.

What''s the actual point here ?

Didier

-- 
Didier Trosset-Moreau
Agilent Technologies
Geneva, Switzerland

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> -----Original Message-----
> From: xen-users-bounces@lists.xensource.com 
> [mailto:xen-users-bounces@lists.xensource.com] On Behalf Of 
> Didier Trosset
> Sent: 30 May 2007 10:27
> To: xen-users@lists.xensource.com
> Subject: [Xen-users] Ubuntu domU install on hvm goes blank screen
> 
> 
> I''ve searched the archive for this subject and hit a couple 
> of messages, but 
> none gave any definitive answer, either a solution or no-way.
I''m going to assume that this is on an Intel processor, as
I''ve never
seen this type of problem on AMD procesors. If I''m wrong, then I guess
there''s something in the configuration that''s wrong. 

I suggest you try non-graphics install to begin with. This may not help,
but it''s a possible solution. 
> 
> Looks like I have to install on real hardware and copy disk 
> afterwards.
> 
> What''s the actual point here ?
The problem is that Intel decided to not allow real-mode in the guest.
Instead they use vm86-mode and emulation of individual instructions that
aren''t allowed in vm86-mode. This is tricky and prone to failure when
the guest does "unexpected" stuff, such as switch from real-mode to
protected-mode and back again - the problem here is maintaing the
internal state in the guest segment registers, which is "hidden" in
the
internal part of the segment registers.

There may also be a different problem, which had a patch submitted to
unstable last week [or so], which is to do with interrupt handling in
real-mode and the switch to protected-mode.  

--
Mats
> 
> Didier
> 
> -- 
> Didier Trosset-Moreau
> Agilent Technologies
> Geneva, Switzerland
> 
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> http://lists.xensource.com/xen-users
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> 


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