[KVM PATCH v4 0/2] irqfd

Gregory Haskins
2009-05-04T17:57:59Z

(Applies to kvm.git:7da2e3ba, plus you will also need Davide Libenzi's
eventfd_file_create() patch, which you can find here:

http://www.mail-archive.com/kvm@vger.kernel.org/msg13923.html

You can find my complete tree with kvm.git, Davide's patch, and this series
here:

http://git.kernel.org/?p=linux/kernel/git/ghaskins/vbus/linux-2.6.git;a=shortlog;h=irqfd

----------------------

irqfd, v4

This series implements a mechanism called "irqfd". It lets you create
an eventfd based file-desriptor to inject interrupts to a kvm guest. For
more details, please see the prologue for patch 2/2.

[ Changelog:

v4:
*) Changed allocation model to create the new fd last, after
we get past the last potential error point by using Davide's
new eventfd_file_create interface (Al Viro, Davide Libenzi)
*) We no longer export sys_eventfd2() since it is replaced
functionally with eventfd_file_create();
*) Rebased to kvm.git:7da2e3ba

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.

Note that this series requires userspace patches for qemu-kvm.git, v3, which
you can find here: http://patchwork.kernel.org/patch/20213/

-Greg

---

Gregory Haskins (2):
kvm: add support for irqfd via eventfd-notification interface
eventfd: export eventfd 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 | 159 ++++++++++++++++++++++++++++++++++++++++++++++
virt/kvm/kvm_main.c | 11 +++
7 files changed, 187 insertions(+), 1 deletions(-)
create mode 100644 virt/kvm/irqfd.c