On the 2019 Xen developer summit there was agreement that the Xen
hypervisor should gain support for a hierarchical name-value store
similar to the Linux kernel's sysfs.
This is a first implementation of that idea adding the basic
functionality to hypervisor and tools side. The interface to any
user program making use of that "xen-hypfs" is a new library
"libxenhypfs" with a stable interface.
The series adds read-only nodes with buildinfo data and writable
nodes with runtime parameters. xl is switched to use the new file
system for modifying the runtime parameters and the old sysctl
interface for that purpose is dropped.
Changes in V6:
- added new patches 1, 10, 11, 12
- addressed review comments
- modified interface for creating nodes for runtime parameters
Changes in V5:
- switched to xsm for privilege check
Changes in V4:
- former patch 2 removed as already committed
- addressed review comments
Changes in V3:
- major rework, especially by supporting binary contents of entries
- added several new patches (1, 2, 7)
- full support of all runtime parameters
- support of writing entries (especially runtime parameters)
Changes in V2:
- all comments to V1 addressed
- added man-page for xenhypfs tool
- added runtime parameter read access for string parameters
Changes in V1:
- renamed xenfs ->xenhypfs
- added writable entries support at the interface level and in the
xenhypfs tool
- added runtime parameter read access (integer type only for now)
- added docs/misc/hypfs-paths.pandoc for path descriptions
Juergen Gross (12):
xen: allow only sizeof(bool) variables for boolean_param()
xen: add a generic way to include binary files as variables
docs: add feature document for Xen hypervisor sysfs-like support
xen: add basic hypervisor filesystem support
libs: add libxenhypfs
tools: add xenfs tool
xen: provide version information in hypfs
xen: add /buildinfo/config entry to hypervisor filesystem
xen: add runtime parameter access support to hypfs
tools/libxl: use libxenhypfs for setting xen runtime parameters
tools/libxc: remove xc_set_parameters()
xen: remove XEN_SYSCTL_set_parameter support
.gitignore | 6 +
docs/features/hypervisorfs.pandoc | 92 ++++++
docs/man/xenhypfs.1.pod | 61 ++++
docs/misc/hypfs-paths.pandoc | 163 +++++++++++
tools/Rules.mk | 8 +-
tools/flask/policy/modules/dom0.te | 4 +-
tools/libs/Makefile | 1 +
tools/libs/hypfs/Makefile | 16 ++
tools/libs/hypfs/core.c | 540 ++++++++++++++++++++++++++++++++++++
tools/libs/hypfs/include/xenhypfs.h | 75 +++++
tools/libs/hypfs/libxenhypfs.map | 10 +
tools/libs/hypfs/xenhypfs.pc.in | 10 +
tools/libxc/include/xenctrl.h | 1 -
tools/libxc/xc_misc.c | 21 --
tools/libxl/Makefile | 3 +-
tools/libxl/libxl.c | 53 +++-
tools/libxl/libxl_internal.h | 1 +
tools/libxl/xenlight.pc.in | 2 +-
tools/misc/Makefile | 6 +
tools/misc/xenhypfs.c | 189 +++++++++++++
tools/xl/xl_misc.c | 1 -
xen/arch/arm/traps.c | 1 +
xen/arch/arm/xen.lds.S | 10 +-
xen/arch/x86/hvm/asid.c | 2 +-
xen/arch/x86/hvm/hypercall.c | 1 +
xen/arch/x86/hvm/vmx/vmcs.c | 30 +-
xen/arch/x86/hypercall.c | 1 +
xen/arch/x86/pv/domain.c | 26 +-
xen/arch/x86/pv/hypercall.c | 1 +
xen/arch/x86/xen.lds.S | 10 +-
xen/common/Kconfig | 10 +
xen/common/Makefile | 13 +
xen/common/grant_table.c | 37 ++-
xen/common/hypfs.c | 377 +++++++++++++++++++++++++
xen/common/kernel.c | 84 +++++-
xen/common/sysctl.c | 36 ---
xen/drivers/char/console.c | 66 ++++-
xen/include/Makefile | 1 +
xen/include/public/hypfs.h | 127 +++++++++
xen/include/public/sysctl.h | 18 --
xen/include/public/xen.h | 1 +
xen/include/xen/hypercall.h | 8 +
xen/include/xen/hypfs.h | 105 +++++++
xen/include/xen/kernel.h | 3 +
xen/include/xen/lib.h | 1 -
xen/include/xen/param.h | 96 ++++---
xen/include/xlat.lst | 2 +
xen/include/xsm/dummy.h | 6 +
xen/include/xsm/xsm.h | 6 +
xen/tools/binfile | 41 +++
xen/xsm/dummy.c | 1 +
xen/xsm/flask/Makefile | 5 +-
xen/xsm/flask/flask-policy.S | 16 --
xen/xsm/flask/hooks.c | 9 +-
xen/xsm/flask/policy/access_vectors | 4 +-
55 files changed, 2243 insertions(+), 175 deletions(-)
create mode 100644 docs/features/hypervisorfs.pandoc
create mode 100644 docs/man/xenhypfs.1.pod
create mode 100644 docs/misc/hypfs-paths.pandoc
create mode 100644 tools/libs/hypfs/Makefile
create mode 100644 tools/libs/hypfs/core.c
create mode 100644 tools/libs/hypfs/include/xenhypfs.h
create mode 100644 tools/libs/hypfs/libxenhypfs.map
create mode 100644 tools/libs/hypfs/xenhypfs.pc.in
create mode 100644 tools/misc/xenhypfs.c
create mode 100644 xen/common/hypfs.c
create mode 100644 xen/include/public/hypfs.h
create mode 100644 xen/include/xen/hypfs.h
create mode 100755 xen/tools/binfile
delete mode 100644 xen/xsm/flask/flask-policy.S
--
2.16.4
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