[Xen-devel] [PATCH v5 00/21] x86: Improvements to cpuid handling for guests

[Andrew Cooper <andrew.cooper3@xxxxxxxxxx>]

This series is available in git form at:
  http://xenbits.xen.org/git-http/people/andrewcoop/xen.git levelling-v4

Notable changes from v4 are further tweaking of the SSE* dependency tree,
fixing of deep-C and P state collection on some Linux dom0 kernels, fix the
construction of HVM domains on Skylake hardware, XSM hooks for the new
sysctls.

Most patches do now how Acks/Reviews.  The remaining patches are #1-3,6-7
(x86), #8,14 (XSM), #15(ARM), #26 (Toolstack).

The current cpuid code, both in the hypervisor and toolstack, has grown
organically for a very long time, and is flawed in many ways.  This series
focuses specifically on the fixing the bits pertaining to the visible
features, and I will be fixing other areas in future work (e.g. per-core,
per-package values, auditing of incoming migration values, etc.)

These changes alter the workflow of cpuid handling as follows:

Xen boots and evaluates its current capabilities.  It uses this information to
calculate the maximum featuresets it can provide to guests, and provides this
information for toolstack consumption.  A toolstack may then calculate a safe
set of features (taking into account migratability), and sets a guests cpuid
policy.  Xen then takes care of context switching the levelling state.

In particular, this means that PV guests may have different levels while
running on the same host, an option which was not previously available.

Andrew Cooper (21):
  xen/x86: Annotate VM applicability in featureset
  xen/x86: Calculate maximum host and guest featuresets
  xen/x86: Generate deep dependencies of features
  xen/x86: Clear dependent features when clearing a cpu cap
  xen/x86: Improve disabling of features which have dependencies
  xen/x86: Improvements to in-hypervisor cpuid sanity checks
  x86/cpu: Move set_cpumask() calls into c_early_init()
  x86/cpu: Sysctl and common infrastructure for levelling context
    switching
  x86/cpu: Rework AMD masking MSR setup
  x86/cpu: Rework Intel masking/faulting setup
  x86/cpu: Context switch cpuid masks and faulting state in
    context_switch()
  x86/pv: Provide custom cpumasks for PV domains
  x86/domctl: Update PV domain cpumasks when setting cpuid policy
  xen+tools: Export maximum host and guest cpu featuresets via SYSCTL
  tools/libxc: Modify bitmap operations to take void pointers
  tools/libxc: Use public/featureset.h for cpuid policy generation
  tools/libxc: Expose the automatically generated cpu featuremask
    information
  tools: Utility for dealing with featuresets
  tools/libxc: Wire a featureset through to cpuid policy logic
  tools/libxc: Use featuresets rather than guesswork
  tools/libxc: Calculate xstate cpuid leaf from guest information

 .gitignore                                   |   1 +
 tools/flask/policy/policy/modules/xen/xen.te |   2 +
 tools/libxc/Makefile                         |   9 +
 tools/libxc/include/xenctrl.h                |  22 +-
 tools/libxc/xc_bitops.h                      |  37 +-
 tools/libxc/xc_cpufeature.h                  | 151 -------
 tools/libxc/xc_cpuid_x86.c                   | 639 +++++++++++++++++----------
 tools/libxl/libxl_cpuid.c                    |   2 +-
 tools/misc/Makefile                          |   4 +
 tools/misc/xen-cpuid.c                       | 394 +++++++++++++++++
 tools/ocaml/libs/xc/xenctrl.ml               |   3 +
 tools/ocaml/libs/xc/xenctrl.mli              |   4 +
 tools/ocaml/libs/xc/xenctrl_stubs.c          |  37 +-
 tools/python/xen/lowlevel/xc/xc.c            |   2 +-
 xen/arch/x86/apic.c                          |   2 +-
 xen/arch/x86/cpu/amd.c                       | 292 ++++++++----
 xen/arch/x86/cpu/common.c                    |  41 +-
 xen/arch/x86/cpu/intel.c                     | 278 ++++++++----
 xen/arch/x86/cpuid.c                         | 218 +++++++++
 xen/arch/x86/crash.c                         |   3 +
 xen/arch/x86/domain.c                        |  18 +-
 xen/arch/x86/domctl.c                        | 138 ++++++
 xen/arch/x86/hvm/hvm.c                       | 125 ++++--
 xen/arch/x86/setup.c                         |   3 +
 xen/arch/x86/sysctl.c                        |  57 +++
 xen/arch/x86/traps.c                         | 254 +++++++----
 xen/arch/x86/xstate.c                        |   6 +-
 xen/include/asm-x86/cpufeature.h             |   4 +
 xen/include/asm-x86/cpuid.h                  |  51 +++
 xen/include/asm-x86/domain.h                 |   2 +
 xen/include/asm-x86/processor.h              |   2 +-
 xen/include/public/arch-x86/cpufeatureset.h  | 190 ++++----
 xen/include/public/sysctl.h                  |  50 +++
 xen/tools/gen-cpuid.py                       | 185 +++++++-
 xen/xsm/flask/hooks.c                        |   6 +
 xen/xsm/flask/policy/access_vectors          |   4 +
 36 files changed, 2400 insertions(+), 836 deletions(-)
 delete mode 100644 tools/libxc/xc_cpufeature.h
 create mode 100644 tools/misc/xen-cpuid.c

-- 
2.1.4


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