On Tue, 2008-06-10 at 10:45 -0500, Hollis Blanchard wrote: > On Tue, 2008-06-10 at 10:33 -0500, Jerone Young wrote: > > On Tue, 2008-06-10 at 10:12 -0500, Hollis Blanchard wrote: > > > On Mon, 2008-06-09 at 18:56 -0500, Jerone Young wrote: > > > > > > If an IAC is matched before we enter the guest it will be caught host > > > > > > that catches it. > > > > > > > > > > But that won't happen because you've disabled MSR[DE]. > > > > > > > > Ah... you don't rember the whole imprecise interrupts ;-) . When MSR[DE] > > > > =0 and an IAC will go off but not at the exact address. This was fun > > > > figuring out. > > > > > > Right. Now, when will the deferred debug event fire, and who will handle > > > it? What can we do about that? > > > > If the debug registers are turned off before we disable MSR[DE], there > > will be no debug events at all. > > > > This is what I was talking about in my first couple of emails. If a > > debug event does go off and the host does not handle it, the only way to > > know is the dbsr register (and there is no way to save that off). So in > > the end it could end up going off in the guest. > > > > This is why I said you should not do host debugging if you want to do > > guest debugging at the sametime, as a work around for now. > > As I said before, forget host debugging! If it's not about host debugging then I'm confused where you are going with this. Please be more clear. > > In fact, here is the exact text I sent to you on Friday, which you don't > appear to have read, in which I said exactly the same thing: > > On Fri, 2008-06-06 at 14:27 -0500, Hollis Blanchard wrote: > > On Fri, 2008-06-06 at 14:11 -0500, Jerone Young wrote: > > > That is an issue if you are using the IAC registers in the host > > also > at the same time. > > > > That is a totally separate issue. Imagine this in the host: > > > > 0xc0001000 load_guest_debug_registers: > > MSR[DE] = 0 > > IAC[0] = 0xc0001080 > > ... > > 0xc0001080 > > ... > > enter guest > > > > IAC1 matched. Now what happens? > > Please think about this scenario. Again I'm lost on where you are going here. We are in the guest it matches. I'm not sure what you are trying to say here? > > > I can clear the dbsr registers also when disabling the debug interrupts > > as a solution? > > I think you're on the right track, but what you propose here simply > won't affect the above scenario. > -- To unsubscribe from this list: send the line "unsubscribe kvm-ppc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
