Messages in this thread | | | Date | Mon, 10 Jul 2023 14:29:28 +0200 | Subject | Re: [RFC PATCH 0/3] x86/paravirt: Get rid of paravirt patching | From | Juergen Gross <> |
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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 > 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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