Avi Kivity wrote: > On 10/12/2009 11:04 AM, Jan Kiszka wrote: >>> I'd rather remove dev-passthrough completely than continue adding >>> hack upon hack >>> upon hack to make is some times kinda sorta work :) >>> >> Hmm, is this code not needed for the VT-d& Co. case? > > It is needed. > >> Or what is the >> alternative? >> > > irqfd (which only supports edge-triggered interrupts now). Note irqfd > needs the same love, it uses a workqueue as well. > > The theory is: > fd1 = eventfd() > give fd1 to kvm as irqfd, vhost-net as trigger fd > fd2 = eventfd() > give fd2 to kvm as irqfd, uio as trigger fd > fd3 = evenfd() > give fd3 to kvm as irqfd, another kvm as ioeventfd > > One interface, multiple users (in the kernel, userspace, or other > processes) I see to overall gain, but likely only worsens my objective (low latency), at least it doesn't improve it. Jan
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