Re: [PATCH v4 6/6] vfio-ccw: Add support for the CRW region and IRQ

[Cornelia Huck <cohuck@redhat.com>]

On Tue,  5 May 2020 14:57:57 +0200
Eric Farman <farman@linux.ibm.com> wrote:

> From: Farhan Ali <alifm@linux.ibm.com>
> 
> The crw region can be used to obtain information about
> Channel Report Words (CRW) from vfio-ccw driver.
> 
> Currently only channel-path related CRWs are passed to
> QEMU from vfio-ccw driver.
> 
> Signed-off-by: Farhan Ali <alifm@linux.ibm.com>
> Signed-off-by: Eric Farman <farman@linux.ibm.com>
> ---
> 
> Notes:
>     v3->v4:
>      - Merge region patch into IRQ patch [CH]
>      - Rework the testing/clearing notifier and reading region [CH]
>     
>     v2->v3:
>      - Remove "size==0" check in CRW notifier [CH]
>      - Remove intermediate rsc/erc variables, use css_queue_crw_cont() [CH]
>      - s/crw0/crw/ [CH]
>     
>     v1->v2:
>      - Add a loop to continually read region while data is
>        present, queueing CRWs as found [CH]
>     
>     v0->v1: [EF]
>      - Fixed copy/paste error in error message (s/schib/CRW)
>      - Check vcdev->crw_region before registering the irq,
>        in case host kernel does not have matching support
>      - Split the refactoring changes to an earlier (new) patch
>        (and don't remove the "num_irqs" check in the register
>        routine, but adjust it to the check the input variable)
>      - Don't revert the cool vfio_set_irq_signaling() stuff
>      - Unregister CRW IRQ before IO IRQ in unrealize
>      - s/crw1/crw0/
> 
>  hw/vfio/ccw.c | 73 +++++++++++++++++++++++++++++++++++++++++++++++++++
>  1 file changed, 73 insertions(+)
> 

Reviewed-by: Cornelia Huck <cohuck@redhat.com>