This series is adding 9pfs support to Xenstore-stubdom, enabling it
to do logging to a dom0 directory.
This is a prerequisite for the final goal to add live update support
to Xenstore-stubdom, as it enables the stubdom to store its state in
a dom0 file.
The 9pfs backend is a new daemon written from scratch. Using a
dedicated 9pfs daemon has several advantages:
- it is using much less resources than a full blown qemu process
- it can serve multiple guests (the idea is to use it for other
infrastructure domains, like qemu-stubdom or driver domains, too)
- it is designed to support several security enhancements, like
limiting the number of files for a guest, or limiting the allocated
file system space
- it doesn't support file links (neither hard nor soft links) or
referencing parent directories via "..", minimizing the risk that
a guest can "escape" from its home directory
Note that for now the daemon only contains the minimal needed
functionality to do logging from Xenstore-stubdom. I didn't want to
add all the 9pfs commands and security add-ons in the beginning, in
order to avoid needless efforts in case the idea of the daemon is
being rejected.
Please note that the pending patch for updating the Mini-OS commit
in Config.mk needs to be applied for patch "stubdom: extend xenstore
stubdom configs" and the following ones.
Changes in V5:
- 10 patches have been applied already
- rename source directory to tools/9pfsd
- addressed comments
Changes in V4:
- patch 2 of V3 was applied
- added support of reading directories
- addressed review comments
Changes in V3:
- new patches 1, 23-25
- addressed review comments
Changes in V2:
- support of multiple rings per device
- xenlogd->xen-9pfsd rename
- addressed review comments
- fixed some bugs
Juergen Gross (22):
tools: add access macros for unaligned data
tools: add a new xen 9pfs daemon
tools/9pfsd: connect to frontend
tools/9pfsd: add transport layer
tools/9pfsd: add 9pfs response generation support
tools/9pfsd: add 9pfs version request support
tools/9pfsd: add 9pfs attach request support
tools/9pfsd: add 9pfs walk request support
tools/9pfsd: add 9pfs open request support
tools/9pfsd: add 9pfs clunk request support
tools/9pfsd: add 9pfs create request support
tools/9pfsd: add 9pfs stat request support
tools/9pfsd: add 9pfs write request support
tools/9pfsd: add 9pfs read request support
tools/libs/light: add backend type for 9pfs PV devices
tools/xl: support new 9pfs backend xen_9pfsd
stubdom: extend xenstore stubdom configs
tools: add 9pfs device to xenstore-stubdom
tools/xenstored: mount 9pfs device in stubdom
tools/xenstored: add helpers for filename handling
tools/xenstored: support complete log capabilities in stubdom
tools/xenstored: have a single do_control_memreport()
docs/man/xl.cfg.5.pod.in | 36 +-
stubdom/xenstore-minios.cfg | 2 +-
stubdom/xenstorepvh-minios.cfg | 2 +-
tools/9pfsd/.gitignore | 1 +
tools/9pfsd/Makefile | 38 +
tools/9pfsd/io.c | 1513 +++++++++++++++++
tools/9pfsd/xen-9pfsd.c | 800 +++++++++
tools/9pfsd/xen-9pfsd.h | 99 ++
tools/Makefile | 1 +
tools/golang/xenlight/helpers.gen.go | 16 +
tools/golang/xenlight/types.gen.go | 13 +
tools/helpers/init-xenstore-domain.c | 7 +
.../Linux/init.d/sysconfig.xencommons.in | 1 -
tools/hotplug/Linux/launch-xenstore.in | 1 +
tools/include/libxl.h | 22 +
tools/include/xen-tools/common-macros.h | 17 +
tools/libs/light/libxl_9pfs.c | 193 ++-
tools/libs/light/libxl_create.c | 4 +-
tools/libs/light/libxl_dm.c | 2 +-
tools/libs/light/libxl_types.idl | 11 +
tools/libs/light/libxl_types_internal.idl | 1 +
tools/xenstored/control.c | 29 +-
tools/xenstored/core.c | 15 +-
tools/xenstored/core.h | 11 +-
tools/xenstored/domain.c | 2 +
tools/xenstored/lu_daemon.c | 4 +-
tools/xenstored/minios.c | 62 +
tools/xenstored/posix.c | 8 +-
tools/xl/xl_parse.c | 23 +-
29 files changed, 2892 insertions(+), 42 deletions(-)
create mode 100644 tools/9pfsd/.gitignore
create mode 100644 tools/9pfsd/Makefile
create mode 100644 tools/9pfsd/io.c
create mode 100644 tools/9pfsd/xen-9pfsd.c
create mode 100644 tools/9pfsd/xen-9pfsd.h
--
2.35.3