(Applies to kvm.git 41b76d8d0487c26d6d4d3fe53c1ff59b3236f096)
This series implements a mechanism called "irqfd". It lets you create
an eventfd based file-desriptor to inject interrupts to a kvm guest. We
associate one gsi per fd for fine-grained routing.
[ Changelog:
v3:
*) The kernel now allocates the eventfd (need to export sys_eventfd2)
*) Added a flags field for future expansion to kvm_irqfd()
*) We properly toggle the irq level 1+0.
*) We re-use the USERSPACE_SRC_ID instead of creating our own
*) Properly check for failures establishing a poll-table with eventfd
*) Fixed fd/file leaks on failure
*) Rebased to lateste kvm.git::41b76d8d04
v2:
*) Dropped notifier_chain based callbacks in favor of
wait_queue_t::func and file::poll based callbacks (Thanks to
Davide for the suggestion)
v1:
*) Initial release
--------
We do not have a user of this interface in this series, though note
future version of virtual-bus (v4 and above) will be based on this.
The first patch will require mainline buy-in, particularly from Davide
(cc'd). The last patch is kvm specific.
qemu-kvm.git patch to follow.
-Greg
---
Gregory Haskins (2):
kvm: add support for irqfd via eventfd-notification interface
eventfd: export fget and signal interfaces for module use
arch/x86/kvm/Makefile | 2 -
arch/x86/kvm/x86.c | 1
fs/eventfd.c | 4 +
include/linux/kvm.h | 7 ++
include/linux/kvm_host.h | 4 +
virt/kvm/irqfd.c | 158 ++++++++++++++++++++++++++++++++++++++++++++++
virt/kvm/kvm_main.c | 11 +++
7 files changed, 186 insertions(+), 1 deletions(-)
create mode 100644 virt/kvm/irqfd.c
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