On 01/31/2013 12:52:41 PM, Alexander Graf wrote:
On 31.01.2013, at 19:43, Scott Wood wrote:
> On 01/31/2013 12:21:07 PM, Alexander Graf wrote:
>> How about something like this? Then both targets at least suck as
much :).
>
> I'm not sure that should be the goal...
>
>> Thanks to e500mc's awful hardware design, we don't know who sets
the MSR_DE bit. Once we forced it onto the guest, we have no change
to know whether the guest also set it or not. We could only guess.
>
> MSRP[DEP] can prevent the guest from modifying MSR[DE] -- but we
still need to set it in the first place.
>
> According to ISA V2.06B, the hypervisor should set DBCR0[EDM] to
let the guest know that the debug resources are not available, and
that "the value of MSR[DE] is not specified and not modifiable".
So what would the guest do then to tell the hypervisor that it
actually wants to know about debug events?
The guest is out of luck, just as if a JTAG were in use.
-Scott
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