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Re: [Xen-users] Xen and Intel Debug Registers

from [Tom Horsley]

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Subject:	Re: [Xen-users] Xen and Intel Debug Registers
From:	Tom Horsley <tom.horsley@xxxxxxx>
Date:	Thu, 16 Aug 2007 17:02:40 -0400
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On Thu, 16 Aug 2007 16:51:20 -0400
"Matt Evenson" <mevenson@xxxxxxxxxx> wrote:

> I would love to hear if anyone else had had success or failure when
> attempting to use Debug Registers inside a Xen VM.

Yes indeed, there appear to be problems. At work we have a big
opteron smp system we have lots of different linux distributions
on in HVMs to use for testing our products in multiple environments.
When I run many debugger tests in parallel on different HVMs,
I get random failures in the watchpoint tests (watchpoints
use the debug registers to generate address traps). If I rerun
the failed tests on one HVM at a time with the other idle, they
always work fine. (And then there are the rhel 5 HVMs which almost
always crash during the debugger tests - don't know if it is the
same problem or not).

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