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Subject[RFC PATCH v2 0/9] hyper_dmabuf: Hyper_DMABUF driver
Date
This patch series contains the implementation of a new device driver,
hyper_DMABUF driver, which provides a way to expand the boundary of
Linux DMA-BUF sharing to across different VM instances in Multi-OS platform
enabled by a Hypervisor (e.g. XEN)

This version 2 series is basically refactored version of old series starting
with "[RFC PATCH 01/60] hyper_dmabuf: initial working version of hyper_dmabuf
drv"

Implementation details of this driver are described in the reference guide
added by the second patch, "[RFC PATCH v2 2/5] hyper_dmabuf: architecture
specification and reference guide".

Attaching 'Overview' section here as a quick summary.

------------------------------------------------------------------------------
Section 1. Overview
------------------------------------------------------------------------------

Hyper_DMABUF driver is a Linux device driver running on multiple Virtual
achines (VMs), which expands DMA-BUF sharing capability to the VM environment
where multiple different OS instances need to share same physical data without
data-copy across VMs.

To share a DMA_BUF across VMs, an instance of the Hyper_DMABUF drv on the
exporting VM (so called, “exporter”) imports a local DMA_BUF from the original
producer of the buffer, then re-exports it with an unique ID, hyper_dmabuf_id
for the buffer to the importing VM (so called, “importer”).

Another instance of the Hyper_DMABUF driver on importer registers
a hyper_dmabuf_id together with reference information for the shared physical
pages associated with the DMA_BUF to its database when the export happens.

The actual mapping of the DMA_BUF on the importer’s side is done by
the Hyper_DMABUF driver when user space issues the IOCTL command to access
the shared DMA_BUF. The Hyper_DMABUF driver works as both an importing and
exporting driver as is, that is, no special configuration is required.
Consequently, only a single module per VM is needed to enable cross-VM DMA_BUF
exchange.

------------------------------------------------------------------------------

There is a git repository at github.com where this series of patches are all
integrated in Linux kernel tree based on the commit:

commit ae64f9bd1d3621b5e60d7363bc20afb46aede215
Author: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Date: Sun Dec 3 11:01:47 2018 -0500

Linux 4.15-rc2

https://github.com/downor/linux_hyper_dmabuf.git hyper_dmabuf_integration_v4

Dongwon Kim, Mateusz Polrola (9):
hyper_dmabuf: initial upload of hyper_dmabuf drv core framework
hyper_dmabuf: architecture specification and reference guide
MAINTAINERS: adding Hyper_DMABUF driver section in MAINTAINERS
hyper_dmabuf: user private data attached to hyper_DMABUF
hyper_dmabuf: hyper_DMABUF synchronization across VM
hyper_dmabuf: query ioctl for retreiving various hyper_DMABUF info
hyper_dmabuf: event-polling mechanism for detecting a new hyper_DMABUF
hyper_dmabuf: threaded interrupt in Xen-backend
hyper_dmabuf: default backend for XEN hypervisor

Documentation/hyper-dmabuf-sharing.txt | 734 ++++++++++++++++
MAINTAINERS | 11 +
drivers/dma-buf/Kconfig | 2 +
drivers/dma-buf/Makefile | 1 +
drivers/dma-buf/hyper_dmabuf/Kconfig | 50 ++
drivers/dma-buf/hyper_dmabuf/Makefile | 44 +
.../backends/xen/hyper_dmabuf_xen_comm.c | 944 +++++++++++++++++++++
.../backends/xen/hyper_dmabuf_xen_comm.h | 78 ++
.../backends/xen/hyper_dmabuf_xen_comm_list.c | 158 ++++
.../backends/xen/hyper_dmabuf_xen_comm_list.h | 67 ++
.../backends/xen/hyper_dmabuf_xen_drv.c | 46 +
.../backends/xen/hyper_dmabuf_xen_drv.h | 53 ++
.../backends/xen/hyper_dmabuf_xen_shm.c | 525 ++++++++++++
.../backends/xen/hyper_dmabuf_xen_shm.h | 46 +
drivers/dma-buf/hyper_dmabuf/hyper_dmabuf_drv.c | 410 +++++++++
drivers/dma-buf/hyper_dmabuf/hyper_dmabuf_drv.h | 122 +++
drivers/dma-buf/hyper_dmabuf/hyper_dmabuf_event.c | 122 +++
drivers/dma-buf/hyper_dmabuf/hyper_dmabuf_event.h | 38 +
drivers/dma-buf/hyper_dmabuf/hyper_dmabuf_id.c | 135 +++
drivers/dma-buf/hyper_dmabuf/hyper_dmabuf_id.h | 53 ++
drivers/dma-buf/hyper_dmabuf/hyper_dmabuf_ioctl.c | 794 +++++++++++++++++
drivers/dma-buf/hyper_dmabuf/hyper_dmabuf_ioctl.h | 52 ++
drivers/dma-buf/hyper_dmabuf/hyper_dmabuf_list.c | 295 +++++++
drivers/dma-buf/hyper_dmabuf/hyper_dmabuf_list.h | 73 ++
drivers/dma-buf/hyper_dmabuf/hyper_dmabuf_msg.c | 416 +++++++++
drivers/dma-buf/hyper_dmabuf/hyper_dmabuf_msg.h | 89 ++
drivers/dma-buf/hyper_dmabuf/hyper_dmabuf_ops.c | 415 +++++++++
drivers/dma-buf/hyper_dmabuf/hyper_dmabuf_ops.h | 34 +
drivers/dma-buf/hyper_dmabuf/hyper_dmabuf_query.c | 174 ++++
drivers/dma-buf/hyper_dmabuf/hyper_dmabuf_query.h | 36 +
.../hyper_dmabuf/hyper_dmabuf_remote_sync.c | 324 +++++++
.../hyper_dmabuf/hyper_dmabuf_remote_sync.h | 32 +
.../dma-buf/hyper_dmabuf/hyper_dmabuf_sgl_proc.c | 257 ++++++
.../dma-buf/hyper_dmabuf/hyper_dmabuf_sgl_proc.h | 43 +
drivers/dma-buf/hyper_dmabuf/hyper_dmabuf_struct.h | 143 ++++
include/uapi/linux/hyper_dmabuf.h | 134 +++
36 files changed, 6950 insertions(+)
create mode 100644 Documentation/hyper-dmabuf-sharing.txt
create mode 100644 drivers/dma-buf/hyper_dmabuf/Kconfig
create mode 100644 drivers/dma-buf/hyper_dmabuf/Makefile
create mode 100644 drivers/dma-buf/hyper_dmabuf/backends/xen/hyper_dmabuf_xen_comm.c
create mode 100644 drivers/dma-buf/hyper_dmabuf/backends/xen/hyper_dmabuf_xen_comm.h
create mode 100644 drivers/dma-buf/hyper_dmabuf/backends/xen/hyper_dmabuf_xen_comm_list.c
create mode 100644 drivers/dma-buf/hyper_dmabuf/backends/xen/hyper_dmabuf_xen_comm_list.h
create mode 100644 drivers/dma-buf/hyper_dmabuf/backends/xen/hyper_dmabuf_xen_drv.c
create mode 100644 drivers/dma-buf/hyper_dmabuf/backends/xen/hyper_dmabuf_xen_drv.h
create mode 100644 drivers/dma-buf/hyper_dmabuf/backends/xen/hyper_dmabuf_xen_shm.c
create mode 100644 drivers/dma-buf/hyper_dmabuf/backends/xen/hyper_dmabuf_xen_shm.h
create mode 100644 drivers/dma-buf/hyper_dmabuf/hyper_dmabuf_drv.c
create mode 100644 drivers/dma-buf/hyper_dmabuf/hyper_dmabuf_drv.h
create mode 100644 drivers/dma-buf/hyper_dmabuf/hyper_dmabuf_event.c
create mode 100644 drivers/dma-buf/hyper_dmabuf/hyper_dmabuf_event.h
create mode 100644 drivers/dma-buf/hyper_dmabuf/hyper_dmabuf_id.c
create mode 100644 drivers/dma-buf/hyper_dmabuf/hyper_dmabuf_id.h
create mode 100644 drivers/dma-buf/hyper_dmabuf/hyper_dmabuf_ioctl.c
create mode 100644 drivers/dma-buf/hyper_dmabuf/hyper_dmabuf_ioctl.h
create mode 100644 drivers/dma-buf/hyper_dmabuf/hyper_dmabuf_list.c
create mode 100644 drivers/dma-buf/hyper_dmabuf/hyper_dmabuf_list.h
create mode 100644 drivers/dma-buf/hyper_dmabuf/hyper_dmabuf_msg.c
create mode 100644 drivers/dma-buf/hyper_dmabuf/hyper_dmabuf_msg.h
create mode 100644 drivers/dma-buf/hyper_dmabuf/hyper_dmabuf_ops.c
create mode 100644 drivers/dma-buf/hyper_dmabuf/hyper_dmabuf_ops.h
create mode 100644 drivers/dma-buf/hyper_dmabuf/hyper_dmabuf_query.c
create mode 100644 drivers/dma-buf/hyper_dmabuf/hyper_dmabuf_query.h
create mode 100644 drivers/dma-buf/hyper_dmabuf/hyper_dmabuf_remote_sync.c
create mode 100644 drivers/dma-buf/hyper_dmabuf/hyper_dmabuf_remote_sync.h
create mode 100644 drivers/dma-buf/hyper_dmabuf/hyper_dmabuf_sgl_proc.c
create mode 100644 drivers/dma-buf/hyper_dmabuf/hyper_dmabuf_sgl_proc.h
create mode 100644 drivers/dma-buf/hyper_dmabuf/hyper_dmabuf_struct.h
create mode 100644 include/uapi/linux/hyper_dmabuf.h

--
2.16.1

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