[XEN,v4,00/14] x86: make CPU virtualisation support configurable

Message

Sergiy Kibrik July 9, 2024, 5:43 a.m. UTC

This is another series to provide a means to render the CPU virtualisation
technology support in Xen configurable.
Currently, irrespectively of the target platform, both AMD-V and Intel VT-x
drivers are built.
The series adds three new Kconfig controls, ALT2PM, SVM and VMX, that can be
used to switch to a finer-grained configuration for a given platform, and
reduce dead code.

The code separation is done using the new config guards.

Major changes in this series, comparing to v3, are turning of macros using_vmx &
using_svm into static inline functions, and also defining & using
arch_vcpu_ioreq_completion() only in VMX-enabled build.
More specific changes are provided in per-patch changelog. 

v3 series here:
https://lore.kernel.org/xen-devel/[e-mail]/

The question about config option naming still remains. I haven't changed names
in this series yet, but a verdict from maintainers is very welcomed. 
My thought is probably to leave names as they're now, CONFIG_{SVM,VMX} that is.
Because now only CONFIG_INTEL_VMX/CONFIG_AMD_SVM occupy much more space,
but also add some unneeded redundancy to names -- I mean Intel is the only
vendor to provide VT-d as for now, and that does not seem to change anytime
soon, does it? (and the same for AMD/AMD-V)

 -Sergiy

Sergiy Kibrik (7):
  x86/altp2m: add static inline stub for altp2m_vcpu_idx()
  x86/p2m: guard altp2m routines
  x86: introduce CONFIG_ALTP2M Kconfig option
  x86: introduce using_{svm,vmx}() helpers
  x86/vmx: guard access to cpu_has_vmx_* in common code
  x86/vpmu: guard calls to vmx/svm functions
  x86/vmx: replace CONFIG_HVM with CONFIG_VMX in vmx.h

Xenia Ragiadakou (7):
  x86: introduce AMD-V and Intel VT-x Kconfig options
  x86/p2m: guard EPT functions with using_vmx() check
  x86/traps: guard vmx specific functions with usinc_vmx() check
  x86/PV: guard svm specific functions with usinc_svm() check
  x86/oprofile: guard svm specific symbols with CONFIG_SVM
  x86/ioreq: guard VIO_realmode_completion with CONFIG_VMX
  x86/hvm: make AMD-V and Intel VT-x support configurable

 xen/arch/arm/ioreq.c                    |  6 -----
 xen/arch/x86/Kconfig                    | 31 +++++++++++++++++++++++++
 xen/arch/x86/cpu/vpmu_amd.c             |  9 +++----
 xen/arch/x86/cpu/vpmu_intel.c           | 16 +++++++------
 xen/arch/x86/domain.c                   |  8 +++----
 xen/arch/x86/hvm/Makefile               |  4 ++--
 xen/arch/x86/hvm/hvm.c                  |  6 ++---
 xen/arch/x86/hvm/ioreq.c                |  2 ++
 xen/arch/x86/hvm/nestedhvm.c            |  4 ++--
 xen/arch/x86/hvm/viridian/viridian.c    |  4 ++--
 xen/arch/x86/include/asm/altp2m.h       | 11 +++++++--
 xen/arch/x86/include/asm/hvm/hvm.h      | 17 +++++++++++++-
 xen/arch/x86/include/asm/hvm/ioreq.h    |  5 ++++
 xen/arch/x86/include/asm/hvm/vmx/vmcs.h | 17 +++++++++-----
 xen/arch/x86/include/asm/hvm/vmx/vmx.h  |  2 +-
 xen/arch/x86/include/asm/p2m.h          | 23 ++++++++++++++----
 xen/arch/x86/mm/Makefile                |  5 ++--
 xen/arch/x86/mm/hap/Makefile            |  2 +-
 xen/arch/x86/mm/p2m-basic.c             | 13 ++++++-----
 xen/arch/x86/mm/p2m-ept.c               |  2 +-
 xen/arch/x86/oprofile/op_model_athlon.c |  2 +-
 xen/arch/x86/traps.c                    | 13 ++++-------
 xen/common/ioreq.c                      |  5 +++-
 xen/include/xen/ioreq.h                 |  1 -
 24 files changed, 141 insertions(+), 67 deletions(-)