linux-kernel - Re: [KVM PATCH v8 1/3] KVM: make io

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Message-ID: <20090625145341.GC7221@redhat.com>
Date:	Thu, 25 Jun 2009 17:53:41 +0300
From:	"Michael S. Tsirkin" <mst@...hat.com>
To:	Gregory Haskins <ghaskins@...ell.com>
Cc:	avi@...hat.com, kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
	mtosatti@...hat.com, paulmck@...ux.vnet.ibm.com, markmc@...hat.com
Subject: Re: [KVM PATCH v8 1/3] KVM: make io_bus interface more robust

On Thu, Jun 25, 2009 at 10:22:29AM -0400, Gregory Haskins wrote:
> Gregory Haskins wrote:
> > Today kvm_io_bus_regsiter_dev() returns void and will internally BUG_ON if it
> > fails.  We want to create dynamic MMIO/PIO entries driven from userspace later
> > in the series, so we need to enhance the code to be more robust with the
> > following changes:
> >
> >    1) Add a return value to the registration function
> >    2) Fix up all the callsites to check the return code, handle any
> >       failures, and percolate the error up to the caller.
> >    3) Add an unregister function that collapses holes in the array

Does not unregister need rcu bus fixes to work?

-- 
MST
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