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SubjectRe: [RFC PATCH 0/3] x86/paravirt: Get rid of paravirt patching
From
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
> work.
>
> 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/vmlinux.lds.S | 13 ---
> arch/x86/tools/relocs.c | 2 +-
> arch/x86/xen/irq.c | 2 +-
> 13 files changed, 111 insertions(+), 249 deletions(-)
>

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