Re: [PATCH 2/7] KVM: arm: guest debug, define API headers

[Paolo Bonzini]

On 26/11/2014 14:13, Alex BennÃe wrote:
> 
> Paolo Bonzini <pbonzini@xxxxxxxxxx> writes:
> 
>> On 25/11/2014 18:13, Peter Maydell wrote:
>>> On 25 November 2014 at 17:05, Paolo Bonzini <pbonzini@xxxxxxxxxx> wrote:
>>>>> So there is no register that says "this breakpoint has triggered" or
>>>>> "this watchpoint has triggered"?
>>> Nope. You take a debug exception; the syndrome register tells
>>> you if it was a bp or a wp, and if it was a wp the fault address
>>> register tells you the address being accessed (if it was a bp
>>> you know the program counter, obviously). The debugger is expected
>>> to be able to figure it out from there, if it cares.
>>
>> That's already good enough---do the KVM_DEBUG_EXIT_* constants match the
>> syndrome register, or if not why?
> 
> No they don't. I did consider it at the time but I was wary of pulling
> too much over into the uapi headers wholesale. If your happy to do that
> I'll include the change in my next version.
> 
> I could also rationalise the exit handlers as they all pretty much do
> the same thing (save for the exit/syndrome related info). Again I was
> keeping things nicely separated in case any particular exception needed
> excessive special case handling.
> 
> Would you like those changes?

Yes, please.

Paolo
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/