[v2] hw/nvme: add irqfd support

[PATCH v2 0/3] hw/nvme: add irqfd support

Jinhao Fan posted 3 patches 1 year, 8 months ago

Diff against v1 v3
Download series mbox

Patches applied successfully (tree, apply log)
git fetch https://github.com/patchew-project/qemu tags/patchew/20220825074746.2047420-1-fanjinhao21s@ict.ac.cn

Maintainers: Keith Busch <kbusch@kernel.org>, Klaus Jensen <its@irrelevant.dk>

There is a newer version of this series

hw/nvme/ctrl.c       | 264 ++++++++++++++++++++++++++++++++++++++++---
hw/nvme/nvme.h       |   7 ++
hw/nvme/trace-events |   3 +
3 files changed, 257 insertions(+), 17 deletions(-)

Expand all Fold all

[PATCH v2 0/3] hw/nvme: add irqfd support

Posted by Jinhao Fan 1 year, 8 months ago

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 patche, 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
second 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.

Changes since v1:
 - Made nvme_irq_(de)assert wrappers around eventfd call and actual irq
   assertion
 - Dropped the previous first patch to avoid duplicate checks for 
   irq_enabled and msix_enabled

Jinhao Fan (3):
  hw/nvme: support irq(de)assertion with eventfd
  hw/nvme: use KVM irqfd when available
  hw/nvme: add MSI-x mask handlers for irqfd

 hw/nvme/ctrl.c       | 264 ++++++++++++++++++++++++++++++++++++++++---
 hw/nvme/nvme.h       |   7 ++
 hw/nvme/trace-events |   3 +
 3 files changed, 257 insertions(+), 17 deletions(-)

-- 
2.25.1