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    SubjectRe: [PATCH 2/2] PCI: pci-stub module to reserve pci device
    On Tue, Nov 25, 2008 at 07:38:39PM -0800, Chris Wright wrote:
    > When doing device assignment with KVM there's currently nothing to
    > protect the device from having a driver in the host as well as the guest.
    > This trivial module just binds the pci device on the host to a stub
    > driver so that a real host driver can't bind to the device. It has no
    > pci id table, it supports only dynamic ids.
    >
    > # echo "8086 10f5" > /sys/bus/pci/drivers/pci-stub/new_id
    > # echo -n 0000:00:19.0 > /sys/bus/pci/drivers/e1000e/unbind
    > # echo -n 0000:00:19.0 > /sys/bus/pci/drivers/pci-stub/bind
    > # ls -l /sys/bus/pci/devices/0000:00:19.0/driver
    > lrwxrwxrwx 1 root root 0 2008-11-25 19:10 /sys/bus/pci/devices/0000:00:19.0/driver -> ../../../bus/pci/drivers/pci-stub

    You might want to put this somewhere in the .c or documentation files
    somewhere as well.

    >
    > Cc: "Kay, Allen M" <allen.m.kay@intel.com>
    > Cc: "Nakajima, Jun" <jun.nakajima@intel.com>
    > Signed-off-by: Chris Wright <chrisw@sous-sol.org>
    > ---
    > drivers/pci/Kconfig | 9 +++++++++
    > drivers/pci/Makefile | 2 ++
    > drivers/pci/pci-stub.c | 38 ++++++++++++++++++++++++++++++++++++++
    > 3 files changed, 49 insertions(+), 0 deletions(-)
    > create mode 100644 drivers/pci/pci-stub.c
    >
    > diff --git a/drivers/pci/Kconfig b/drivers/pci/Kconfig
    > index e1ca425..f6183df 100644
    > --- a/drivers/pci/Kconfig
    > +++ b/drivers/pci/Kconfig
    > @@ -42,6 +42,15 @@ config PCI_DEBUG
    >
    > When in doubt, say N.
    >
    > +config PCI_STUB
    > + tristate "PCI Stub driver"
    > + depends on PCI
    > + help
    > + Say Y or M here if you want be able to reserve a PCI device
    > + when it is going to be assigned to a guest.

    "guest operating system"? Otherwise, just "guest" doesn't mean much
    here in this context.

    Other than that minor thing, looks great.

    Acked-by: Greg Kroah-Hartman <gregkh@suse.de>

    thanks,

    greg k-h


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