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Subject[RFC 00/17] Pile o' entry stack changes
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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

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