Re: [libvirt] [Question] vhost-user hotplug: multiqueue hotplug seems doesn't pass mq and vectors

On 30.11.2016 10:02, Gaohaifeng (A) wrote:

I think we should pass it. Two reasons: 1. in none hotplug, we will pass it. We can see from libvirt function qemuBuildVhostuserCommandLine, it will pass queue num as vhostfdSize 2. If we don't pass vectors, qemu will use default value. Now default value is 3, (qemu codes: DEFINE_PROP_UINT32("vectors", VirtIOPCIProxy, nvectors, 3)) So that qemu init msix table with 3 vectors(qemu function: msix_init_exclusive_bar), this will cause Guest can only use 3 interrupts at most. Actually, it use Two, one for config one for other virtqueues.

I see. Do you want to provide a patch or should I do that? Michal