[v4,0/4] xen/x86: add testing for self modifying code and livepatch

Message

Roger Pau Monné Dec. 15, 2023, 11:18 a.m. UTC

Hello,

The following series contains a misc set of fixes and improvements.

There's one improvement for the hypervisor to set function alignment for
livepatch builds in order to make sure there's always enough space in a
function to be live-patched.

Following patches attempt to introduce a set of tests for self modifying
code, currently one test using the alternatives framework, and one test
for livepatch.

Last patch hooks the newly introduced livepatch test into the gitlab CI
using QEMU and an Alpine Linux dom0:

https://gitlab.com/xen-project/people/royger/xen/-/pipelines/1108069448

Roger Pau Monne (4):
  x86/livepatch: align functions to ensure minimal distance between
    entry points
  xen/x86: introduce self modifying code test
  x86/livepatch: introduce a basic live patch test to gitlab CI
  automation: add x86-64 livepatching test

 automation/gitlab-ci/build.yaml               |  9 +++
 automation/gitlab-ci/test.yaml                |  8 +++
 automation/scripts/build-livepatch            | 27 +++++++
 .../scripts/qemu-alpine-x86_64-livepatch.sh   | 68 ++++++++++++++++++
 tools/include/xenctrl.h                       |  2 +
 tools/libs/ctrl/xc_misc.c                     | 14 ++++
 tools/misc/xen-livepatch.c                    | 29 ++++++++
 xen/Kconfig                                   | 19 +++++
 xen/Makefile                                  |  3 +
 xen/arch/arm/livepatch.c                      |  2 +
 xen/arch/arm/xen.lds.S                        |  4 ++
 xen/arch/x86/Kconfig                          |  1 +
 xen/arch/x86/Makefile                         |  1 +
 xen/arch/x86/include/asm/test.h               | 37 ++++++++++
 xen/arch/x86/livepatch.c                      |  4 ++
 xen/arch/x86/setup.c                          |  3 +
 xen/arch/x86/sysctl.c                         |  9 +++
 xen/arch/x86/test/Makefile                    |  3 +
 xen/arch/x86/test/smoc-lp-alt.c               | 24 +++++++
 xen/arch/x86/test/smoc-lp.c                   | 24 +++++++
 xen/arch/x86/test/smoc.c                      | 70 +++++++++++++++++++
 xen/arch/x86/xen.lds.S                        |  4 ++
 xen/common/Kconfig                            |  5 +-
 xen/common/kernel.c                           |  5 +-
 xen/include/public/sysctl.h                   | 13 ++++
 xen/include/xen/lib.h                         |  1 +
 26 files changed, 386 insertions(+), 3 deletions(-)
 create mode 100755 automation/scripts/build-livepatch
 create mode 100755 automation/scripts/qemu-alpine-x86_64-livepatch.sh
 create mode 100644 xen/arch/x86/include/asm/test.h
 create mode 100644 xen/arch/x86/test/Makefile
 create mode 100644 xen/arch/x86/test/smoc-lp-alt.c
 create mode 100644 xen/arch/x86/test/smoc-lp.c
 create mode 100644 xen/arch/x86/test/smoc.c