[PATCH v2 00/20] Pile o' entry/exit/sp0 changes

From: Andy Lutomirski
Date: Thu Nov 02 2017 - 03:59:28 EST


Hi all-

Here we go again! I haven't done most of the requested label
renaming, nor have I done Brian's reordering of the SYSCALL return
code, mainly because I want to keep the ball rolling. As for label
renaming, I'd rather let everyone finish arguing and then rename any
labels at the end. I personally don't mind longish asm labels.

Changes from v1:
- Comment improvements.
- Lots of Reviewed-bys added.
- Fix vm86 bug.
- Completely remove RESTORE_..._REGS_... (Linus) -- adds two patches.

Changes from the old RFC version:
- Rebase
- Add Juergen's patch
- Add some assertions
- Cleanups

Andy Lutomirski (19):
x86/asm/64: Remove the restore_c_regs_and_iret label
x86/asm/64: Split the iret-to-user and iret-to-kernel paths
x86/asm/64: Move SWAPGS into the common iret-to-usermode path
x86/asm/64: Simplify reg restore code in the standard IRET paths
x86/asm/64: Shrink paranoid_exit_restore and make labels local
x86/asm/64: Use pop instead of movq in syscall_return_via_sysret
x86/asm/64: Merge the fast and slow SYSRET paths
x86/entry/64: Use POP instead of MOV to restore regs on NMI return
x86/entry/64: Remove the RESTORE_..._REGS infrastructure
x86/asm/64: De-Xen-ify our NMI code
x86/asm/32: Pull MSR_IA32_SYSENTER_CS update code out of
native_load_sp0()
x86/asm/64: Pass sp0 directly to load_sp0()
x86/asm: Add task_top_of_stack() to find the top of a task's stack
x86/xen/64: Clean up SP code in cpu_initialize_context()
x86/boot/64: Stop initializing TSS.sp0 at boot
x86/asm/64: Remove all remaining direct thread_struct::sp0 reads
x86/boot/32: Fix cpu_current_top_of_stack initialization at boot
x86/asm/64: Remove thread_struct::sp0
x86/traps: Use a new on_thread_stack() helper to clean up an assertion

Juergen Gross (1):
xen: add xen nmi trap entry

arch/x86/entry/calling.h | 69 +++++------------
arch/x86/entry/entry_64.S | 139 ++++++++++++++++++++--------------
arch/x86/entry/entry_64_compat.S | 3 +-
arch/x86/include/asm/compat.h | 1 +
arch/x86/include/asm/paravirt.h | 5 +-
arch/x86/include/asm/paravirt_types.h | 2 +-
arch/x86/include/asm/processor.h | 52 +++++--------
arch/x86/include/asm/switch_to.h | 24 ++++++
arch/x86/include/asm/traps.h | 2 +-
arch/x86/kernel/cpu/common.c | 12 ++-
arch/x86/kernel/head_64.S | 2 +-
arch/x86/kernel/process.c | 8 +-
arch/x86/kernel/process_32.c | 6 +-
arch/x86/kernel/process_64.c | 5 +-
arch/x86/kernel/smpboot.c | 3 +-
arch/x86/kernel/traps.c | 3 +-
arch/x86/kernel/vm86_32.c | 20 ++---
arch/x86/xen/enlighten_pv.c | 9 +--
arch/x86/xen/smp_pv.c | 17 ++++-
arch/x86/xen/xen-asm_64.S | 2 +-
20 files changed, 208 insertions(+), 176 deletions(-)

--
2.13.6