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.
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 (33):
tools: add access macros for unaligned data
xen/public: add some more 9pfs xenstore paths
tools: add a new xen logging daemon
tools/xenlogd: connect to frontend
tools/xenlogd: add transport layer
tools/xenlogd: add 9pfs response generation support
tools/xenlogd: add 9pfs version request support
tools/xenlogd: add 9pfs attach request support
tools/xenlogd: add 9pfs walk request support
tools/xenlogd: add 9pfs open request support
tools/xenlogd: add 9pfs clunk request support
tools/xenlogd: add 9pfs create request support
tools/xenlogd: add 9pfs stat request support
tools/xenlogd: add 9pfs write request support
tools/xenlogd: add 9pfs read request support
tools/libs/light: add backend type for 9pfs PV devices
tools/xl: support new 9pfs backend xen-9pfsd
tools/helpers: allocate xenstore event channel for xenstore stubdom
tools/xenstored: rename xenbus_evtchn()
stubdom: extend xenstore stubdom configs
tools: add 9pfs device to xenstore-stubdom
tools/xenstored: add early_init() function
tools/xenstored: move systemd handling to posix.c
tools/xenstored: move all log-pipe handling into posix.c
tools/xenstored: move all socket handling into posix.c
tools/xenstored: get own domid in stubdom case
tools/xenstored: rework ring page (un)map functions
tools/xenstored: split domain_init()
tools/xenstored: map stubdom interface
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/Makefile | 1 +
tools/golang/xenlight/helpers.gen.go | 10 +
tools/golang/xenlight/types.gen.go | 12 +
tools/helpers/init-xenstore-domain.c | 9 +
.../Linux/init.d/sysconfig.xencommons.in | 1 -
tools/hotplug/Linux/launch-xenstore.in | 1 +
tools/include/libxl.h | 17 +
tools/include/xen-tools/common-macros.h | 17 +
tools/libs/light/libxl_9pfs.c | 174 +-
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/xen-9pfsd/.gitignore | 1 +
tools/xen-9pfsd/Makefile | 38 +
tools/xen-9pfsd/io.c | 1467 +++++++++++++++++
tools/xen-9pfsd/xen-9pfsd.c | 798 +++++++++
tools/xen-9pfsd/xen-9pfsd.h | 99 ++
tools/xenstored/Makefile.common | 4 -
tools/xenstored/control.c | 29 +-
tools/xenstored/core.c | 250 +--
tools/xenstored/core.h | 35 +-
tools/xenstored/domain.c | 81 +-
tools/xenstored/domain.h | 2 +
tools/xenstored/lu_daemon.c | 4 +-
tools/xenstored/minios.c | 93 +-
tools/xenstored/posix.c | 251 ++-
tools/xl/xl_parse.c | 36 +
xen/include/public/io/9pfs.h | 34 +
32 files changed, 3197 insertions(+), 325 deletions(-)
create mode 100644 tools/xen-9pfsd/.gitignore
create mode 100644 tools/xen-9pfsd/Makefile
create mode 100644 tools/xen-9pfsd/io.c
create mode 100644 tools/xen-9pfsd/xen-9pfsd.c
create mode 100644 tools/xen-9pfsd/xen-9pfsd.h
--
2.35.3