This patch series makes it possible to compile out the userspace IO system
calls, iopl and ioperm.
The first patch does some 32/64 unification in copy_thread to make subsequent
changes easier. The second patch simplifies the complex calculation of the TSS
segment limit, which also makes it easier to change in the last patch. Patches
3-9 introduce helpers to make it easier to compile out IO. The last patch adds
and uses the new CONFIG_X86_IOPORT to support compiling out userspace IO.
v3 had patches 3-10 as a single patch; v4 splits out the various helpers and
macros into separate patches, as requested by Thomas Gleixner.
I've verified that this compiles after each patch.
Josh Triplett (10):
x86: process: Unify 32-bit and 64-bit copy_thread I/O bitmap handling
x86: tss: Eliminate fragile calculation of TSS segment limit
x86: processor.h: Introduce macros to initialize IO fields of thread
and TSS
x86: paravirt: Wrap initialization of set_iopl_mask in a macro
x86: cpu: Add helper function unifying 32-bit and 64-bit IO init in
cpu_init
x86: process: Introduce helper to clear a thread's IO bitmap
x86: process: Introduce helper to switch iopl mask
x86: process: Introduce helper for IO-related bits of exit_thread
x86: process: Introduce helper to switch IO bitmap
x86: Support compiling out userspace IO (iopl and ioperm)
arch/x86/Kconfig | 10 ++++
arch/x86/include/asm/desc.h | 11 +----
arch/x86/include/asm/paravirt.h | 2 +
arch/x86/include/asm/paravirt_types.h | 5 ++
arch/x86/include/asm/processor.h | 55 +++++++++++++++++----
arch/x86/include/asm/syscalls.h | 3 ++
arch/x86/kernel/Makefile | 3 +-
arch/x86/kernel/cpu/common.c | 12 +----
arch/x86/kernel/entry_64.S | 9 ++--
arch/x86/kernel/paravirt.c | 2 +-
arch/x86/kernel/process-io.h | 93 +++++++++++++++++++++++++++++++++++
arch/x86/kernel/process.c | 34 ++-----------
arch/x86/kernel/process_32.c | 41 +++++----------
arch/x86/kernel/process_64.c | 27 +++-------
arch/x86/kernel/ptrace.c | 8 +++
arch/x86/xen/enlighten.c | 4 +-
drivers/tty/vt/vt_ioctl.c | 2 +-
kernel/sys_ni.c | 5 ++
18 files changed, 208 insertions(+), 118 deletions(-)
create mode 100644 arch/x86/kernel/process-io.h
--
2.1.1
_______________________________________________
Virtualization mailing list
Virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx
https://lists.linuxfoundation.org/mailman/listinfo/virtualization
