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Re: [Qemu-devel] [PATCH 2/2] Route IOAPIC interrupts via ISA bus

From: Gerd Hoffmann
Subject: Re: [Qemu-devel] [PATCH 2/2] Route IOAPIC interrupts via ISA bus
Date: Thu, 27 Aug 2009 10:13:07 +0200
User-agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv: Gecko/20090814 Fedora/3.0-2.6.b3.fc11 Lightning/1.0pre Thunderbird/3.0b3

On 08/27/09 09:57, Avi Kivity wrote:
What is needed on the guest side? Looks like even 2.6.30 doesn't use
MSI for virtio-net ...

virtio msi support was merged in 2.6.31. For e1000, guest support is
presumably there, just need to wire it into the device.

lspci shows MSI (not MSI-X) capability for the e1000 in my laptop. It is not enabled. dmesg has this line though:

0000:02:00.0: 0000:02:00.0: Failed to initialize MSI interrupts. Falling back to legacy interrupts.

so the driver at least tried to enable MSI ...


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