[PATCH v3 00/21] xen: simplify frontend side ring setup

[Oleksandr]

On 05.05.22 11:16, Juergen Gross wrote:

Hello Juergen.



> Many Xen PV frontends share similar code for setting up a ring page
> (allocating and granting access for the backend) and for tearing it
> down.
>
> Create new service functions doing all needed steps in one go.
>
> This requires all frontends to use a common value for an invalid
> grant reference in order to make the functions idempotent.
>
> Changes in V3:
> - new patches 1 and 2, comments addressed
>
> Changes in V2:
> - new patch 9 and related changes in patches 10-18
>
> Juergen Gross (21):
>    xen: update grant_table.h
>    xen/grant-table: never put a reserved grant on the free list
>    xen/blkfront: switch blkfront to use INVALID_GRANT_REF
>    xen/netfront: switch netfront to use INVALID_GRANT_REF
>    xen/scsifront: remove unused GRANT_INVALID_REF definition
>    xen/usb: switch xen-hcd to use INVALID_GRANT_REF
>    xen/drm: switch xen_drm_front to use INVALID_GRANT_REF
>    xen/sound: switch xen_snd_front to use INVALID_GRANT_REF
>    xen/dmabuf: switch gntdev-dmabuf to use INVALID_GRANT_REF
>    xen/shbuf: switch xen-front-pgdir-shbuf to use INVALID_GRANT_REF
>    xen: update ring.h
>    xen/xenbus: add xenbus_setup_ring() service function
>    xen/blkfront: use xenbus_setup_ring() and xenbus_teardown_ring()
>    xen/netfront: use xenbus_setup_ring() and xenbus_teardown_ring()
>    xen/tpmfront: use xenbus_setup_ring() and xenbus_teardown_ring()
>    xen/drmfront: use xenbus_setup_ring() and xenbus_teardown_ring()
>    xen/pcifront: use xenbus_setup_ring() and xenbus_teardown_ring()
>    xen/scsifront: use xenbus_setup_ring() and xenbus_teardown_ring()
>    xen/usbfront: use xenbus_setup_ring() and xenbus_teardown_ring()
>    xen/sndfront: use xenbus_setup_ring() and xenbus_teardown_ring()
>    xen/xenbus: eliminate xenbus_grant_ring()


For the patches that touch PV display (#07, #16), PV sound (#08, #20) 
and shared buffer framework used by both frontends (#10):

Reviewed-by: Oleksandr Tyshchenko <oleksandr_tyshchenko at epam.com>


Also I didn't see any issues with these frontends while testing on Arm64 
based board.
So, you can also add:

[Arm64 only]
Tested-by: Oleksandr Tyshchenko <oleksandr_tyshchenko at epam.com>


Thanks!


>
>   drivers/block/xen-blkfront.c                |  57 +++----
>   drivers/char/tpm/xen-tpmfront.c             |  18 +--
>   drivers/gpu/drm/xen/xen_drm_front.h         |   9 --
>   drivers/gpu/drm/xen/xen_drm_front_evtchnl.c |  43 ++----
>   drivers/net/xen-netfront.c                  |  85 ++++-------
>   drivers/pci/xen-pcifront.c                  |  19 +--
>   drivers/scsi/xen-scsifront.c                |  31 +---
>   drivers/usb/host/xen-hcd.c                  |  65 ++------
>   drivers/xen/gntdev-dmabuf.c                 |  13 +-
>   drivers/xen/grant-table.c                   |  12 +-
>   drivers/xen/xen-front-pgdir-shbuf.c         |  18 +--
>   drivers/xen/xenbus/xenbus_client.c          |  82 +++++++---
>   include/xen/grant_table.h                   |   2 -
>   include/xen/interface/grant_table.h         | 161 ++++++++++++--------
>   include/xen/interface/io/ring.h             |  19 ++-
>   include/xen/xenbus.h                        |   4 +-
>   sound/xen/xen_snd_front_evtchnl.c           |  44 ++----
>   sound/xen/xen_snd_front_evtchnl.h           |   9 --
>   18 files changed, 287 insertions(+), 404 deletions(-)
>
-- 
Regards,

Oleksandr Tyshchenko