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Re: [Qemu-devel] [RFC][PATCH 28/45] qemu-kvm: msix: Drop tracking of use


From: Jan Kiszka
Subject: Re: [Qemu-devel] [RFC][PATCH 28/45] qemu-kvm: msix: Drop tracking of used vectors
Date: Tue, 18 Oct 2011 17:58:09 +0200
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 2011-10-18 17:56, Michael S. Tsirkin wrote:
>> What would probably help us long-term out of your concerns regarding
>> lazy routing is to bypass that redundant GSI translation for dynamic
>> messages, i.e. those that are not associated with an irqfd number or an
>> assigned device irq. Something like a KVM_DELIVER_MSI IOCTL that accepts
>> address and data directly.
>>
>> Jan
> 
> You are trying to work around the problem by not requiring
> any resources per MSI vector. This just might work for some
> uses (ioctl) but isn't a generic solution (e.g. won't work for irqfd).

irqfd is not affected anymore in that model as it cannot participate in
lazy routing anyway.

Jan

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Siemens AG, Corporate Technology, CT T DE IT 1
Corporate Competence Center Embedded Linux



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