Messages in this thread | | | From | Andy Lutomirski <> | Subject | [RFC 00/17] Pile o' entry stack changes | Date | Wed, 6 Sep 2017 14:36:45 -0700 |
| |
Hi all-
Here's a pile of entry changes. In brief summary:
- Lots of people (Linus included) have asked to convert the entry code to pop registers on exit instead of movqing them off the stack. This makes a bunch of progress in that direction.
- Linux's sp0 handling has annoyed me for a while. We have thread_struct::sp0, which never made much sense to me. This series removes it on x86_64 and removes most references on x86_32.
- Xen PV's cpuinit code did incomprehensible things with stack pointers. This makes it comprehensible.
Juergen, this needs a bit of help on Xen -- see the NMI patch for details.
Reviews would be appreciated :)
Andy Lutomirski (17): 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/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
arch/x86/entry/calling.h | 9 +++ arch/x86/entry/entry_64.S | 133 ++++++++++++++++++---------------- 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 | 68 +++++++++-------- arch/x86/include/asm/switch_to.h | 23 ++++++ arch/x86/include/asm/thread_info.h | 11 --- arch/x86/kernel/cpu/common.c | 12 ++- arch/x86/kernel/head_64.S | 2 +- arch/x86/kernel/process.c | 3 +- arch/x86/kernel/process_32.c | 3 +- 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 | 14 ++-- arch/x86/lguest/boot.c | 7 +- arch/x86/xen/enlighten_pv.c | 7 +- arch/x86/xen/smp_pv.c | 17 ++++- 20 files changed, 192 insertions(+), 139 deletions(-)
-- 2.13.5
| |