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Re: [Qemu-devel] [PATCH 11/22] i8259: Update IRQ state after reset

From: Peter Maydell
Subject: Re: [Qemu-devel] [PATCH 11/22] i8259: Update IRQ state after reset
Date: Fri, 30 Sep 2011 10:14:17 +0100

On 30 September 2011 07:47, Jan Kiszka <address@hidden> wrote:
> There is no difference between system reset after power-up or later on.
> And there should be no difference between per device, per group of
> devices or system-wide reset. A device model cannot tell these apart.

I think it's also useful to distinguish "system reset" meaning 'simulated
reset button was pressed, causing the reset line to be asserted on various
devices' from "simulation reset" meaning 'qemu effectively tore down the
whole simulation and put it into the same state it would be when qemu
initially starts'. I don't think you can usefully reset a single device
except by asserting its simulated reset signal, except possibly for
hotplug type situations where you're simulating applying power to it.

> My series does not depend on this cleanup/fix, but the reason not to
> apply remains wrong IMHO.

(just to be clear) I'm not arguing against your patch, just more
generally that I'm not sure our current model of reset is entirely

-- PMM

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