Re: [PATCH 0/4] hw/nvme: add irqfd support

[Jinhao Fan]

at 11:37 PM, Jinhao Fan <fanjinhao21s@ict.ac.cn> wrote:

> This patch series changes qemu-nvme's interrupt emulation to use event
> notifiers, which can ensure thread-safe interrupt delivery when iothread
> is used. In the first two patches, I convert qemu-nvme's IO emulation
> logic to send irq via eventfd, so that the actual assertion and
> deassertion is always done in the main loop thread with BQL held. In the
> third patch, support is added to send irq via KVM irqfd, bypassing
> qemu's MSI-x emulation. In the last patch, I add MSI-x mask handlers
> when irqfd is enabled so that qemu-nvme knows which vector is masked
> even when qemu's MSI-x emulation is bypassed.
> 
> Jinhao Fan (4):
>  hw/nvme: avoid unnecessary call to irq (de)assertion functions
>  hw/nvme: add option to (de)assert irq with eventfd
>  hw/nvme: use irqfd to send interrupts
>  hw/nvme: add MSI-x mask handlers for irqfd
> 
> hw/nvme/ctrl.c       | 251 +++++++++++++++++++++++++++++++++++++++----
> hw/nvme/nvme.h       |   7 ++
> hw/nvme/trace-events |   3 +
> 3 files changed, 243 insertions(+), 18 deletions(-)
> 
> -- 
> 2.25.1

Ping~

Thanks!