Messages in this thread | ![/](/images/icornerl.gif) | | Date | Thu, 24 Aug 2023 11:01:56 +0200 | Subject | Re: [RFC PATCH 0/3] x86/paravirt: Get rid of paravirt patching | From | Juergen Gross <> |
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On 10.07.23 14:29, Juergen Gross wrote: > 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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