On Monday, October 17, 2016 4:59 PM, Paolo Bonzini wrote:
> On 17/10/2016 08:47, Wang, Wei W wrote:
> Well, hypercalls aren't really that common in KVM. :) There are exactly two, and
> one of them does nothing except force a vmexit.
>
> Anyway, here are four good reasons why this hypercall is not welcome:
>
> 1) irqfd seems to be fast enough for VFIO and existing vhost backends, so it
> should be fast enough for vhost-pci as well;
>
> 2) if irqfd is not fast enough, optimizing it would benefit VFIO and existing vhost
> backends, so we should first look into that anyway;
>
> 3) vhost-pci's host part should be basically a vhost-user backend implemented by
> QEMU. Any deviation from that should be considered very carefully;
>
> 4) vhost-pci's first use case should be with DPDK, which does polling anyway, not
> interrupts.
>
Thanks Paolo for the comments. I will take your suggestions and send out a new version of the design.
Best,
Wei
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