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