Re: [RFC PATCH 0/3] x86/paravirt: Get rid of paravirt patching

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Any comments?

On 08.06.23 16:03, Juergen Gross wrote:
This is a small series getting rid of paravirt patching by switching
completely to alternative patching for the same functionality.

The basic idea is to add the capability to switch from indirect to
direct calls via a special alternative patching option.

This removes _some_ of the paravirt macro maze, but most of it needs
to stay due to the need of hiding the call instructions from the
compiler in order to avoid needless register save/restore.

What is going away is the nasty stacking of alternative and paravirt
patching and (of course) the special .parainstructions linker section.

I have tested the series on bare metal and as Xen PV domain to still

RFC because I'm quite sure there will be some objtool work needed
(at least removing the specific paravirt handling).

Juergen Gross (3):
   x86/paravirt: move some functions and defines to alternative
   x86/alternative: add indirect call patching
   x86/paravirt: switch mixed paravirt/alternative calls to alternative_2

  arch/x86/include/asm/alternative.h        | 26 +++++-
  arch/x86/include/asm/paravirt.h           | 39 ++-------
  arch/x86/include/asm/paravirt_types.h     | 68 +++-------------
  arch/x86/include/asm/qspinlock_paravirt.h |  4 +-
  arch/x86/include/asm/text-patching.h      | 12 ---
  arch/x86/kernel/alternative.c             | 99 +++++++++++------------
  arch/x86/kernel/callthunks.c              | 17 ++--
  arch/x86/kernel/kvm.c                     |  4 +-
  arch/x86/kernel/module.c                  | 20 ++---
  arch/x86/kernel/paravirt.c                | 54 ++-----------
  arch/x86/kernel/             | 13 ---
  arch/x86/tools/relocs.c                   |  2 +-
  arch/x86/xen/irq.c                        |  2 +-
  13 files changed, 111 insertions(+), 249 deletions(-)

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