Bernardo Innocenti (on Thu, 17 May 2007 02:36:21 -0400) wrote:
>Keith Owens wrote:
>
>> Before using MSR, you must first check that the cpu supports the
>> instruction, rd/wrmsr cause an oops on 486 or earlier. Also using an
>> invalid msr number causes an oops, so use rd/wrmsr_safe().
>
>I didn't bother implementing those checks because kdb recovers
>nicely from GPF anyway.
Yes and no. Yes, kdb will recover from a GPF. No, because if the
system was already running correctly (i.e. manual entry into kdb), then
taking a GPF and not recovering will flag the rest of the system as
corrupt and can kill a running system. I try to avoid adding spurious
system corruption.
>It's the valid MSR writes that could
>cause unrecoveable problems! :)
Tell me about it :-(
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