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[Qemu-devel] Re: [RFC] prep: enable irq sharing on ide again
From: |
Alexander Graf |
Subject: |
[Qemu-devel] Re: [RFC] prep: enable irq sharing on ide again |
Date: |
Mon, 14 Feb 2011 12:34:57 +0100 |
User-agent: |
Thunderbird 2.0.0.23 (X11/20090817) |
Gerd Hoffmann wrote:
> On 02/08/11 00:26, Alexander Graf wrote:
>> The new ISA infrastructure checks for potential irq sharing bugs on
>> interrupt lines, because usually irq lines on isa can't be shared.
>>
>> The PREP spec however mandates that the irq lines for both IDE ports
>> are shared and according to Aurelien this also used to work just fine.
>>
>> So let's add a way to enable this sharing again, so we don't introduce
>> unnecessary regressions over older versions of Qemu.
>
> Had a patch for that, got shoot down for reasons I don't remember,
> attached for reference. It basically allows IRQ sharing in case the
> two devices sharing the IRQ are of the same kind. In that case you
> usually have a single guest driver handling both devices and IRQ
> sharing works most of the time.
>
> I don't mind much which approach we take ...
I'm very indifferent myself :). This is not an issue we should waste too
much time/effort on.
Alex