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Re: [Qemu-devel] [PATCH 2/7] target/openrisc: add shutdown logic

From: Richard Henderson
Subject: Re: [Qemu-devel] [PATCH 2/7] target/openrisc: add shutdown logic
Date: Sat, 22 Apr 2017 17:25:53 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.0

On 04/22/2017 12:09 PM, Stafford Horne wrote:
I discussed a bit on #qemu and Alexander Graf suggested to properly define
shutdown semantics for openrisc. Some examples were shown from ppc, s390
and arm.

Yes, properly defining this in the spec goes a long way toward fixing the underlying problem.

It's probably worth thinking about a wait-state condition as well, so that qemu can avoid staying pegged at 100% host cpu for an idle guest cpu.

   ppc - platform
   Registers hardware device mpc8xxx_gpio which handles shutdown via gpio

That's one possibility.  Another is to define an SPR.


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