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

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Message-ID: <20130311140925.GP31619@redhat.com>
Date:	Mon, 11 Mar 2013 16:09:25 +0200
From:	Gleb Natapov <gleb@...hat.com>
To:	Jan Kiszka <jan.kiszka@...mens.com>
Cc:	Paolo Bonzini <pbonzini@...hat.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"kvm@...r.kernel.org" <kvm@...r.kernel.org>,
	"mtosatti@...hat.com" <mtosatti@...hat.com>
Subject: Re: [PATCH] x86: kvm: reset the bootstrap processor when it gets an
 INIT

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.
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