Christian Ehrhardt wrote:
Note the the xm console command terminates on its own, i.e. the guest
machine seems to halt and not hang somewhere.
I could verify that the real mode code up to the assembly code in
pmjump.S is in fact executed. The problem appears to occur while
enabling protected mode. I tried to put endless loops into the 32-bit
setup code but these were apparently not reached. As far as I understand
this, the protected mode jump in pmjump.S seems to jump into nowhere.
I am willing to do tests with the XEN guest and send any additional
information that might be helpful. However, I cannot change the XEN host
at this time.
Any suggestions?
All of this point to a bug in the Xen emulation host. You're not saying
if you're on an Intel or AMD host, but on Intel, hardware
virtualization doesn't actually kick in until you're in protected mode
with all segments configured properly. This means all of pmjump.S runs
in an interpreter. A bug in that interpreter would cause what you observe.
-hpa
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