[patch 00/24] x86/entry: Consolidation - Part III

Thomas Gleixner
2020-02-25T23:30:01Z

Hi!

This is the third batch of a 73 patches series which consolidates the x86
entry code. The larger explanation is in the part I cover letter:

https://lore.kernel.org/r/20200225213636.689276920@linutronix.de

I applies on top of part II which can be found here:

https://lore.kernel.org/r/20200225220801.571835584@linutronix.de

This part consolidates the entry stub ASM code generation by:

- Distangling the unreadable idtentry maze on 64bit

- Providing idtentry for 32bit

- Providing exception entry point macros which

- Declare the required ASM, C and XEN/PV prototypes

- Hide the underlying C-entry magic in the macros which are used for
wrapping the actual C handler. This includes marking them notrace
and exclude them from kprobes so in a later step irq flags tracing
and enter from user space handling can be moved out from ASM into C
into one central place

- Have one header file (idtentry.h) which provides all the macros and
also acts as a collection point for all idtentries which need to be
emitted as ASM stubs.

- Converting the trivial exceptions over to the new scheme

This is the first step to get rid of the pointless differences between 32
bit and 64 bit (arch_entry.h vs. random defines in entry_64.S) and having
consistent prototypes and exception C-handler mechanics all over the place
instead of a randomly chosen implementation here and there.

This applies on top of part two which is available here:

git://git.kernel.org/pub/scm/linux/kernel/git/tglx/devel.git entry-v1-part2

To get part 1 - 3 pull from here:

git://git.kernel.org/pub/scm/linux/kernel/git/tglx/devel.git entry-v1-part3

Thanks,

tglx

8<---------------
entry/entry_32.S | 167 ++++++-------------
entry/entry_64.S | 410 ++++++++++++++++++++++++++-----------------------
include/asm/idtentry.h | 150 +++++++++++++++++
include/asm/trapnr.h | 31 +++
include/asm/traps.h | 74 --------
kernel/idt.c | 30 +--
kernel/traps.c | 129 +++++++++------
xen/enlighten_pv.c | 35 ++--
xen/xen-asm_32.S | 2
xen/xen-asm_64.S | 30 +--
10 files changed, 584 insertions(+), 474 deletions(-)