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[Qemu-devel] Re: [RFC] prep: enable irq sharing on ide again
From: |
Jan Kiszka |
Subject: |
[Qemu-devel] Re: [RFC] prep: enable irq sharing on ide again |
Date: |
Mon, 14 Feb 2011 12:40:08 +0100 |
User-agent: |
Mozilla/5.0 (X11; U; Linux i686 (x86_64); de; rv:1.8.1.12) Gecko/20080226 SUSE/2.0.0.12-1.1 Thunderbird/2.0.0.12 Mnenhy/0.7.5.666 |
On 2011-02-14 12:22, 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.
Yeah, 3x -serial XXX is also broken for x86 targets as the third device
shares its IRQ with the first - like on real HW...
Jan
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