From: Marcelo Tosatti <mtosatti@redhat.com>
To: Sheng Yang <sheng@linux.intel.com>
Cc: Avi Kivity <avi@redhat.com>, kvm@vger.kernel.org
Subject: Re: [PATCH 15/15] KVM: Fix racy in kvm_free_assigned_irq
Date: Sat, 27 Dec 2008 18:15:46 -0200 [thread overview]
Message-ID: <20081227201546.GA5187@amt.cnet> (raw)
In-Reply-To: <20081227200626.GA4095@amt.cnet>
On Sat, Dec 27, 2008 at 06:06:26PM -0200, Marcelo Tosatti wrote:
> On Fri, Dec 26, 2008 at 10:30:07AM +0800, Sheng Yang wrote:
> > Thanks to Marcelo's observation, The following code have potential issue:
> >
> > if (cancel_work_sync(&assigned_dev->interrupt_work))
> > kvm_put_kvm(kvm);
> >
> > In fact, cancel_work_sync() would return true either work struct is only
> > scheduled or the callback of work struct is executed. This code only
> > consider the former situation.
>
> Why not simply drop the reference inc / dec from irq handler/work
> function?
>
> Just make sure that there is no queued/executing work left behind on
> vm shutdown. Don't think an additional reference is necessary. Or am I
> missing something?
And maybe drop this issue from the patchset and fix it separately, since
it is a bugfix.
next prev parent reply other threads:[~2008-12-27 20:16 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-12-25 9:09 [PATCH 0/15] Device assignment & MSI enhancement Sheng Yang
2008-12-25 9:09 ` [PATCH 01/15] KVM: Add MSI_ACTION flag for assigned irq Sheng Yang
2008-12-25 9:09 ` [PATCH 02/15] KVM: Use kvm_free_assigned_irq() for free irq Sheng Yang
2008-12-25 9:09 ` [PATCH 03/15] KVM: Add support to disable MSI for assigned device Sheng Yang
2008-12-25 9:09 ` [PATCH 04/15] KVM: Add a route layer to convert MSI message to GSI Sheng Yang
2008-12-25 9:09 ` [PATCH 05/15] KVM: Using gsi_msg mapping for MSI device assignment Sheng Yang
2008-12-25 9:09 ` [PATCH 06/15] KVM: Improve MSI dispatch function Sheng Yang
2008-12-25 9:09 ` [PATCH 07/15] KVM: Using ioapic_irqchip() macro for kvm_set_irq Sheng Yang
2008-12-25 9:09 ` [PATCH 08/15] KVM: Merge MSI handling to kvm_set_irq Sheng Yang
2008-12-25 9:09 ` [PATCH 09/15] KVM: Split IOAPIC structure Sheng Yang
2008-12-25 9:09 ` [PATCH 10/15] KVM: Unified the delivery of IOAPIC and MSI Sheng Yang
2008-12-25 9:09 ` [PATCH 11/15] KVM: Change API of kvm_ioapic_get_delivery_bitmask Sheng Yang
2008-12-25 9:09 ` [PATCH 12/15] KVM: Update intr delivery func to accept unsigned long* bitmap Sheng Yang
2008-12-25 9:09 ` [PATCH 13/15] KVM: bit ops for deliver_bitmap Sheng Yang
2008-12-25 9:09 ` [PATCH 14/15] KVM: Using kfifo for irq recording Sheng Yang
2008-12-26 2:29 ` [PATCH 14/15] KVM: Replace host_irq_disable with a new flag Sheng Yang
2008-12-25 9:09 ` [PATCH 15/15] KVM: Fix racy in kvm_free_assigned_irq Sheng Yang
2008-12-25 11:56 ` Sheng Yang
2008-12-26 2:30 ` Sheng Yang
2008-12-27 20:06 ` Marcelo Tosatti
2008-12-27 20:15 ` Marcelo Tosatti [this message]
2008-12-28 11:24 ` Sheng Yang
2008-12-28 12:57 ` Avi Kivity
2008-12-29 5:42 ` Amit Shah
2008-12-29 12:23 ` Sheng Yang
2008-12-29 13:37 ` Avi Kivity
2008-12-29 13:49 ` Sheng Yang
2008-12-29 15:20 ` Marcelo Tosatti
2008-12-30 2:14 ` Sheng Yang
2008-12-30 16:45 ` Marcelo Tosatti
2008-12-31 5:43 ` Sheng Yang
2009-01-02 0:10 ` Marcelo Tosatti
2009-01-05 7:07 ` Sheng Yang
2009-01-05 13:27 ` Avi Kivity
2009-01-06 1:25 ` Sheng Yang
2008-12-29 13:20 ` Avi Kivity
2008-12-25 9:13 ` [PATCH 0/15] Device assignment & MSI enhancement Sheng Yang
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