linux-kernel - Re: [KVM PATCH v6 0/4] irqfd fixes and enhancements

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Date:	Mon, 29 Jun 2009 11:46:13 -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: Re: [KVM PATCH v6 0/4] irqfd fixes and enhancements

Gregory Haskins wrote:
> (Applies to kvm.git/master:4631e094)
>
> 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.
>
> You can also find this applied as a git tree:
>
> git pull git://git.kernel.org/pub/scm/linux/kernel/git/ghaskins/linux-2.6-hacks.git kvm/irqfd
>
> For reviewing convenience, here is a link to the entire virt/kvm/eventfd.c
> file after the patches are applied:
>
> http://git.kernel.org/?p=linux/kernel/git/ghaskins/linux-2.6-hacks.git;a=blob;f=virt/kvm/eventfd.c;h=409d9e160f1f85618a5e3772937b2721a249399a;hb=85cfd57e33dcaea29971513334ca003764653b21
>
> As always, this series has been tested against the kvm-eventfd unit test, and
> appears to be functioning properly. You can download this test here:
>
> ftp://ftp.novell.com/dev/ghaskins/kvm-eventfd.tar.bz2
>
> I've included version 4 of Davide's eventfd patch (ported to kvm.git) so
> that its a complete reviewable series.  Note, however, that there may be
> later versions of his patch to consider for merging, so we should
> coordinate with him.
>
> -Greg
>
>
> [Changelog:
>
> 	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(-)
>   

Forgot another change:

                          *) Fixed race in ASSIGN for the proper
acquisition order of the irqfd->eventfd

> 	v5:
>            Untracked..
> ]
>
> ---
>
> Davide Libenzi (1):
>       eventfd - revised interface and cleanups (4th rev)
>
> Gregory Haskins (3):
>       KVM: add irqfd DEASSIGN feature
>       KVM: Fix races in irqfd using new eventfd_kref_get interface
>       kvm: prepare irqfd for having interrupts disabled during eventfd->release
>
>
>  drivers/lguest/lg.h          |    2 
>  drivers/lguest/lguest_user.c |    4 -
>  fs/aio.c                     |   24 +---
>  fs/eventfd.c                 |  126 ++++++++++++++++++++---
>  include/linux/aio.h          |    4 -
>  include/linux/eventfd.h      |   35 +++++-
>  include/linux/kvm.h          |    2 
>  include/linux/kvm_host.h     |    5 +
>  virt/kvm/Kconfig             |    1 
>  virt/kvm/eventfd.c           |  229 +++++++++++++++++++++++++++++++-----------
>  10 files changed, 321 insertions(+), 111 deletions(-)
>
>   



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