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* [PATCH v3 00/21] paravirt: cleanup and reorg
@ 2025-10-06  7:45 Juergen Gross
  2025-10-06  7:45 ` [PATCH v3 05/21] paravirt: Remove asm/paravirt_api_clock.h Juergen Gross
  2025-10-06  7:45 ` [PATCH v3 06/21] sched: Move clock related paravirt code to kernel/sched Juergen Gross
  0 siblings, 2 replies; 4+ messages in thread
From: Juergen Gross @ 2025-10-06  7:45 UTC (permalink / raw)
  To: linux-kernel, x86, linux-hyperv, virtualization, loongarch,
	linuxppc-dev, linux-riscv, kvm
  Cc: Juergen Gross, Andy Lutomirski, Thomas Gleixner, Ingo Molnar,
	Borislav Petkov, Dave Hansen, H. Peter Anvin, K. Y. Srinivasan,
	Haiyang Zhang, Wei Liu, Dexuan Cui, Peter Zijlstra, Will Deacon,
	Boqun Feng, Waiman Long, Jiri Kosina, Josh Poimboeuf, Pawan Gupta,
	Boris Ostrovsky, xen-devel, Ajay Kaher, Alexey Makhalov,
	Broadcom internal kernel review list, Russell King,
	Catalin Marinas, Huacai Chen, WANG Xuerui, Madhavan Srinivasan,
	Michael Ellerman, Nicholas Piggin, Christophe Leroy,
	Paul Walmsley, Palmer Dabbelt, Albert Ou, Alexandre Ghiti,
	Juri Lelli, Vincent Guittot, Dietmar Eggemann, Steven Rostedt,
	Ben Segall, Mel Gorman, Valentin Schneider, linux-arm-kernel,
	Paolo Bonzini, Vitaly Kuznetsov, Stefano Stabellini,
	Oleksandr Tyshchenko, Daniel Lezcano, Oleg Nesterov

Some cleanups and reorg of paravirt code and headers:

- The first 2 patches should be not controversial at all, as they
  remove just some no longer needed #include and struct forward
  declarations.

- The 3rd patch is removing CONFIG_PARAVIRT_DEBUG, which IMO has
  no real value, as it just changes a crash to a BUG() (the stack
  trace will basically be the same). As the maintainer of the main
  paravirt user (Xen) I have never seen this crash/BUG() to happen.

- The 4th patch is just a movement of code.

- I don't know for what reason asm/paravirt_api_clock.h was added,
  as all archs supporting it do it exactly in the same way. Patch
  5 is removing it.

- Patches 6-14 are streamlining the paravirt clock interfaces by
  using a common implementation across architectures where possible
  and by moving the related code into common sched code, as this is
  where it should live.

- Patches 15-20 are more like RFC material preparing the paravirt
  infrastructure to support multiple pv_ops function arrays.
  As a prerequisite for that it makes life in objtool much easier
  with dropping the Xen static initializers of the pv_ops sub-
  structures, which is done in patches 15-17.
  Patches 18-20 are doing the real preparations for multiple pv_ops
  arrays and using those arrays in multiple headers.

- Patch 21 is an example how the new scheme can look like using the
  PV-spinlocks.

Changes in V2:
- new patches 13-18 and 20
- complete rework of patch 21

Changes in V3:
- fixed 2 issues detected by kernel test robot

Juergen Gross (21):
  x86/paravirt: Remove not needed includes of paravirt.h
  x86/paravirt: Remove some unneeded struct declarations
  x86/paravirt: Remove PARAVIRT_DEBUG config option
  x86/paravirt: Move thunk macros to paravirt_types.h
  paravirt: Remove asm/paravirt_api_clock.h
  sched: Move clock related paravirt code to kernel/sched
  arm/paravirt: Use common code for paravirt_steal_clock()
  arm64/paravirt: Use common code for paravirt_steal_clock()
  loongarch/paravirt: Use common code for paravirt_steal_clock()
  riscv/paravirt: Use common code for paravirt_steal_clock()
  x86/paravirt: Use common code for paravirt_steal_clock()
  x86/paravirt: Move paravirt_sched_clock() related code into tsc.c
  x86/paravirt: Introduce new paravirt-base.h header
  x86/paravirt: Move pv_native_*() prototypes to paravirt.c
  x86/xen: Drop xen_irq_ops
  x86/xen: Drop xen_cpu_ops
  x86/xen: Drop xen_mmu_ops
  objtool: Allow multiple pv_ops arrays
  x86/paravirt: Allow pv-calls outside paravirt.h
  x86/paravirt: Specify pv_ops array in paravirt macros
  x86/pvlocks: Move paravirt spinlock functions into own header

 arch/Kconfig                                  |   3 +
 arch/arm/Kconfig                              |   1 +
 arch/arm/include/asm/paravirt.h               |  22 --
 arch/arm/include/asm/paravirt_api_clock.h     |   1 -
 arch/arm/kernel/Makefile                      |   1 -
 arch/arm/kernel/paravirt.c                    |  23 --
 arch/arm64/Kconfig                            |   1 +
 arch/arm64/include/asm/paravirt.h             |  14 -
 arch/arm64/include/asm/paravirt_api_clock.h   |   1 -
 arch/arm64/kernel/paravirt.c                  |  11 +-
 arch/loongarch/Kconfig                        |   1 +
 arch/loongarch/include/asm/paravirt.h         |  13 -
 .../include/asm/paravirt_api_clock.h          |   1 -
 arch/loongarch/kernel/paravirt.c              |  10 +-
 arch/powerpc/include/asm/paravirt.h           |   3 -
 arch/powerpc/include/asm/paravirt_api_clock.h |   2 -
 arch/powerpc/platforms/pseries/setup.c        |   4 +-
 arch/riscv/Kconfig                            |   1 +
 arch/riscv/include/asm/paravirt.h             |  14 -
 arch/riscv/include/asm/paravirt_api_clock.h   |   1 -
 arch/riscv/kernel/paravirt.c                  |  11 +-
 arch/x86/Kconfig                              |   8 +-
 arch/x86/entry/entry_64.S                     |   1 -
 arch/x86/entry/vsyscall/vsyscall_64.c         |   1 -
 arch/x86/hyperv/hv_spinlock.c                 |  11 +-
 arch/x86/include/asm/apic.h                   |   4 -
 arch/x86/include/asm/highmem.h                |   1 -
 arch/x86/include/asm/mshyperv.h               |   1 -
 arch/x86/include/asm/paravirt-base.h          |  29 ++
 arch/x86/include/asm/paravirt-spinlock.h      | 146 ++++++++
 arch/x86/include/asm/paravirt.h               | 331 +++++-------------
 arch/x86/include/asm/paravirt_api_clock.h     |   1 -
 arch/x86/include/asm/paravirt_types.h         | 269 +++++++-------
 arch/x86/include/asm/pgtable_32.h             |   1 -
 arch/x86/include/asm/ptrace.h                 |   2 +-
 arch/x86/include/asm/qspinlock.h              |  89 +----
 arch/x86/include/asm/spinlock.h               |   1 -
 arch/x86/include/asm/timer.h                  |   1 +
 arch/x86/include/asm/tlbflush.h               |   4 -
 arch/x86/kernel/Makefile                      |   2 +-
 arch/x86/kernel/apm_32.c                      |   1 -
 arch/x86/kernel/callthunks.c                  |   1 -
 arch/x86/kernel/cpu/bugs.c                    |   1 -
 arch/x86/kernel/cpu/vmware.c                  |   1 +
 arch/x86/kernel/kvm.c                         |  11 +-
 arch/x86/kernel/kvmclock.c                    |   1 +
 arch/x86/kernel/paravirt-spinlocks.c          |  26 +-
 arch/x86/kernel/paravirt.c                    |  42 +--
 arch/x86/kernel/tsc.c                         |  10 +-
 arch/x86/kernel/vsmp_64.c                     |   1 -
 arch/x86/kernel/x86_init.c                    |   1 -
 arch/x86/lib/cache-smp.c                      |   1 -
 arch/x86/mm/init.c                            |   1 -
 arch/x86/xen/enlighten_pv.c                   |  82 ++---
 arch/x86/xen/irq.c                            |  20 +-
 arch/x86/xen/mmu_pv.c                         | 100 ++----
 arch/x86/xen/spinlock.c                       |  11 +-
 arch/x86/xen/time.c                           |   2 +
 drivers/clocksource/hyperv_timer.c            |   2 +
 drivers/xen/time.c                            |   2 +-
 include/linux/sched/cputime.h                 |  18 +
 kernel/sched/core.c                           |   5 +
 kernel/sched/cputime.c                        |  13 +
 kernel/sched/sched.h                          |   3 +-
 tools/objtool/arch/x86/decode.c               |   8 +-
 tools/objtool/check.c                         |  78 ++++-
 tools/objtool/include/objtool/check.h         |   2 +
 67 files changed, 659 insertions(+), 827 deletions(-)
 delete mode 100644 arch/arm/include/asm/paravirt.h
 delete mode 100644 arch/arm/include/asm/paravirt_api_clock.h
 delete mode 100644 arch/arm/kernel/paravirt.c
 delete mode 100644 arch/arm64/include/asm/paravirt_api_clock.h
 delete mode 100644 arch/loongarch/include/asm/paravirt_api_clock.h
 delete mode 100644 arch/powerpc/include/asm/paravirt_api_clock.h
 delete mode 100644 arch/riscv/include/asm/paravirt_api_clock.h
 create mode 100644 arch/x86/include/asm/paravirt-base.h
 create mode 100644 arch/x86/include/asm/paravirt-spinlock.h
 delete mode 100644 arch/x86/include/asm/paravirt_api_clock.h

-- 
2.51.0



^ permalink raw reply	[flat|nested] 4+ messages in thread

end of thread, other threads:[~2025-10-15 16:04 UTC | newest]

Thread overview: 4+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2025-10-06  7:45 [PATCH v3 00/21] paravirt: cleanup and reorg Juergen Gross
2025-10-06  7:45 ` [PATCH v3 05/21] paravirt: Remove asm/paravirt_api_clock.h Juergen Gross
2025-10-15 16:02   ` Shrikanth Hegde
2025-10-06  7:45 ` [PATCH v3 06/21] sched: Move clock related paravirt code to kernel/sched Juergen Gross

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