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

Juergen Gross
2022-05-05T08:17:15Z

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()

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(-)

--
2.35.3