linux-kernel - Re: [PATCH v2 04/15] virtio: defer config changed notifications

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Message-ID: <20141006172525.4b663de6.cornelia.huck@de.ibm.com>
Date:	Mon, 6 Oct 2014 17:25:25 +0200
From:	Cornelia Huck <cornelia.huck@...ibm.com>
To:	"Michael S. Tsirkin" <mst@...hat.com>
Cc:	linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
	virtualization@...ts.linux-foundation.org
Subject: Re: [PATCH v2 04/15] virtio: defer config changed notifications

On Mon, 6 Oct 2014 18:10:55 +0300
"Michael S. Tsirkin" <mst@...hat.com> wrote:

> Defer config changed notifications that arrive during
> probe/scan/freeze/restore.
> 
> This will allow drivers to set DRIVER_OK earlier, without worrying about
> racing with config change interrupts.
> 
> This change will also benefit old hypervisors (before 2009)
> that send interrupts without checking DRIVER_OK: previously,
> the callback could race with driver-specific initialization.
> 
> This will also help simplify drivers.
> 
> Signed-off-by: Michael S. Tsirkin <mst@...hat.com>
> ---
>  include/linux/virtio.h  |  6 ++++++
>  drivers/virtio/virtio.c | 57 +++++++++++++++++++++++++++++++++++++++++--------
>  2 files changed, 54 insertions(+), 9 deletions(-)

Reviewed-by: Cornelia Huck <cornelia.huck@...ibm.com>

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