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    SubjectRe: [Xen-devel] [PATCH 3/4] xen: Add xenbusd device driver
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    On Wed, 2011-12-07 at 21:13 +0000, Bastian Blank wrote:
    > Access for xenstored to the event channel and pre-allocated ring is
    > managed via xenfs. This adds its own device driver featuring mmap for
    > the ring and an ioctl for the event channel.
    >
    > Signed-off-by: Bastian Blank <waldi@debian.org>
    > ---
    > drivers/xen/xenbus/Makefile | 1 +
    > drivers/xen/xenbus/xenbus_dev_backend.c | 79 +++++++++++++++++++++++++++++++
    > include/xen/xenbus_dev.h | 41 ++++++++++++++++
    > 3 files changed, 121 insertions(+), 0 deletions(-)
    > create mode 100644 drivers/xen/xenbus/xenbus_dev_backend.c
    > create mode 100644 include/xen/xenbus_dev.h
    >
    > diff --git a/drivers/xen/xenbus/Makefile b/drivers/xen/xenbus/Makefile
    > index a2ea363..31e2e90 100644
    > --- a/drivers/xen/xenbus/Makefile
    > +++ b/drivers/xen/xenbus/Makefile
    > @@ -10,4 +10,5 @@ xenbus-objs += xenbus_probe.o
    > xenbus-be-objs-$(CONFIG_XEN_BACKEND) += xenbus_probe_backend.o
    > xenbus-objs += $(xenbus-be-objs-y)
    >
    > +obj-$(CONFIG_XEN_BACKEND) += xenbus_dev_backend.o

    In principal this could be its own module which does not depend on any
    of the backend stuff but I think this is fine for now.

    > [...]

    > +static int __init xenbusd_init(void)
    > +{
    > + int err;
    > +
    > + if (!xen_initial_domain())
    > + return -ENODEV;
    > +
    > + err = misc_register(&xenbusd_dev);
    > + if (err)
    > + printk(KERN_ERR "Could not register xenbus device\n");

    "Could not register xenbus backend device" to distinguish from the f.e.
    failure message, you could also add "frontend" there I suppose. Other
    than that:
    Acked-by: Ian Campbell <ian.campbell@citrix.com>




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