From: Bernhard Kohl <bernhard.kohl@gmx.net>
To: kvm@vger.kernel.org
Subject: Re: [PATCH] KVM: IOAPIC: Do not check polarity
Date: Mon, 16 Mar 2009 22:30:34 +0000 (UTC) [thread overview]
Message-ID: <loom.20090316T222246-94@post.gmane.org> (raw)
In-Reply-To: 49BCDAAD.7000706@redhat.com
Avi Kivity <avi <at> redhat.com> writes:
>
> While qemu uses active-high interrupts throughout, kvm is meant to be
> useful with other userspace (or for emulating other chipsets) and thus
> needs correct polarity emulation.
>
> If the guest programs polarity to active-low, this indicates either a
> guest bug or a bios bug. Is it possible the bios does not communicate
> the fact that pci interrupts are active high correctly?
>
The guest gets the polarity from the BIOS MP table, which I added. I defined
the polarity and trigger mode "low level". I will change that to "high level".
Need to wait for testing until next week.
prev parent reply other threads:[~2009-03-16 22:35 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-03-13 10:53 [PATCH] KVM: IOAPIC: Do not check polarity Bernhard Kohl
2009-03-15 10:38 ` Avi Kivity
2009-03-16 22:30 ` Bernhard Kohl [this message]
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