On 12/04/2010 03:48 PM, Anthony Liguori wrote:
No, an interrupt causes the HLT to be executed, and rip advanced past
it. You need to preserve this (both for interrupts and for the apf
completion exception).
Yeah, I see in the architecture manual it specifically calls out the
rip advancing after NMI. It doesn't say anything about debug
exceptions though.
Instruction breakpoints are triggered before HLT executes; and HLT can't
trigger data breakpoints.
It's not clear to me if some exceptions cause hlt to be skipped and
others not.
Faults take place before HLT is executed (and thus don't advance RIP).
Interrupts take place during HLT execution and cause it to complete.
But then again, skipping hlt seems to be the most conservative thing
to do for all exceptions because it's always going to be run in a loop.
There's no "all exceptions" here. Only interrupts can happen, and the
APF completion, which is wired to a fault vector, but we must treat it
as an interrupt.
--
error compiling committee.c: too many arguments to function
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