Re: [PATCH] x86: kvm: reset the bootstrap processor when it gets an INIT

Gleb Natapov
2013-03-11T14:09:25Z

On Mon, Mar 11, 2013 at 03:06:18PM +0100, Jan Kiszka wrote:
> On 2013-03-11 15:05, Gleb Natapov wrote:
> > On Mon, Mar 11, 2013 at 03:01:40PM +0100, Jan Kiszka wrote:
> >>> We are not moving away from mp_state, we are moving away from using
> >>> mp_state for signaling because with nested virt INIT does not always
> >>> change mp_state, not only that it can change mp_state long after signal
> >>> is received after vmx off is done.
> >>
> >> Right.
> >>
> >> BTW, for that to happen, we will also need to influence the INIT level.
> >> Unless I misread the spec, INIT is blocked while in root mode, and if
> >> you deassert INIT before leaving root (vmxoff, vmenter), nothing
> >> actually happens. So what matters is the INIT signal level at the exit
> >> of root mode.
> >>
> > You are talking about INIT# signal received via CPU pin, right? I think
> > INIT send by IPI cannot go away.
>
> Why shouldn't it? Besides edge, there is also level-triggered INIT.
>
OK, so level-triggered INIT can be de-asserted what about edge triggered
one? :)

--
Gleb.