linux-kernel - [KVM PATCH v8 0/3] irqfd fixes and enhancements

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Date:	Wed, 01 Jul 2009 12:08:57 -0400
From:	Gregory Haskins <ghaskins@...ell.com>
To:	kvm@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, mst@...hat.com, avi@...hat.com,
	davidel@...ilserver.org
Subject: [KVM PATCH v8 0/3] irqfd fixes and enhancements

(Applies to kvm.git/master:beeaacd1)

The following is the latest attempt to fix the races in irqfd/eventfd, as
well as restore DEASSIGN support.  For more details, please read the patch
headers.

As always, this series has been tested against the kvm-eventfd unit test
and everything appears to be functioning properly. You can download this
test here:

ftp://ftp.novell.com/dev/ghaskins/kvm-eventfd.tar.bz2

Kind Regards,
-Greg


[Changelog:

	v8:
	   *) Rebased to kvm.git/master:beeaacd1)
	   *) Dropped Davide's patch (2/5 in v7) since it's now upstream
	   *) Folded v7's 1/5 and 3/5 together, and added a single
	      eventfd hunk to convert wake_up_locked_polled to wake_up_polled
	   *) Dropped irqfd->active bit in favor of irqfd_is_active() function
	   *) Cleaned up comments in 1/3
	   *) Dropped v7's 5/5 (slow-work)
	   *) Added new patch (3/3) which makes the cleanup-wq's creation
	      dynamic so to avoid the resource penalty for guests that do
	      not use irqfd.

	v7:
	   *) Addressed minor-nit feedback from Michael
	   *) Cleaned up patch headers
	   *) Re-added separate slow-work feature patch to end for comparison

	v6:
	   *) Removed slow-work in favor of using a dedicated single-thread
              workqueue.
	   *) Condensed cleanup path to always use deferred shutdown
	   *) Saved about 56 lines over v5, with the following diffstat:

 	   include/linux/kvm_host.h |    2 
 	   virt/kvm/eventfd.c       |  248 ++++++++++++++++++-----------------------------
 	   2 files changed, 97 insertions(+), 153 deletions(-)
	v5:
           Untracked..
]

---

Gregory Haskins (3):
      KVM: create irqfd-cleanup-wq on demand
      KVM: add irqfd DEASSIGN feature
      KVM: Fix races in irqfd using new eventfd_kref_get interface


 fs/eventfd.c             |    7 -
 include/linux/kvm.h      |    2 
 include/linux/kvm_host.h |    6 +
 virt/kvm/eventfd.c       |  281 ++++++++++++++++++++++++++++++++++++----------
 4 files changed, 229 insertions(+), 67 deletions(-)

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