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

Jan Kiszka
2013-03-11T14:06:18Z

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.

Jan

--
Siemens AG, Corporate Technology, CT RTC ITP SDP-DE
Corporate Competence Center Embedded Linux