On Fri, Dec 11, 2020 at 05:22:11PM -0500, Tony Krowiak wrote:
> The vfio_ap device driver registers a group notifier with VFIO when the
> file descriptor for a VFIO mediated device for a KVM guest is opened to
> receive notification that the KVM pointer is set (VFIO_GROUP_NOTIFY_SET_KVM
> event). When the KVM pointer is set, the vfio_ap driver takes the
> following actions:
> 1. Stashes the KVM pointer in the vfio_ap_mdev struct that holds the state
> of the mediated device.
> 2. Calls the kvm_get_kvm() function to increment its reference counter.
> 3. Sets the function pointer to the function that handles interception of
> the instruction that enables/disables interrupt processing.
>
> When the notifier is called to make notification that the KVM pointer has
> been set to NULL, the driver should reverse the actions taken when the
> KVM pointer was set as well as unplugging the AP devices passed through
> to the KVM guest.
>
> Fixes: 258287c994de ("s390: vfio-ap: implement mediated device open callback")
> Signed-off-by: Tony Krowiak <akrowiak@xxxxxxxxxxxxx>
> ---
> drivers/s390/crypto/vfio_ap_ops.c | 40 ++++++++++++++++++-------------
> 1 file changed, 24 insertions(+), 16 deletions(-)
<formletter>
This is not the correct way to submit patches for inclusion in the
stable kernel tree. Please read:
https://www.kernel.org/doc/html/latest/process/stable-kernel-rules.html
for how to do this properly.
</formletter>
