Changes since v6 [1]:
- Collected Tony's Reviewed-by.
- Rebased on v5.8-rc3 to address a conflict with commit e3a9e681adb7
("x86/entry: Fixup bad_iret vs noinstr") No other functional changes,
and no other comments since v5. At this point I think I'll go ahead
with pushing to -next to get it some soak time for a potential v5.9
merge and catch any other conflicts that might arise in the meantime. Of
course, I'll immediately drop it from -next if x86.tip picks it up or
naks it. As it stands, nothing queued in x86.tip/master conflicts with
these.
[1]: http://lore.kernel.org/r/159244031857.1107636.5054974045023236143.stgit@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
---
The primary motivation to go touch memcpy_mcsafe() is that the existing
benefit of doing slow and careful copies is obviated on newer CPUs. That
fact solves the problem of needing to detect machine-check recovery
capability. Now the old "mcsafe_key" opt-in to careful copying can be made
an opt-out from the default fast copy implementation.
The discussion with Linus further made clear that this facility had
already lost its x86-machine-check specificity starting with commit
2c89130a56a ("x86/asm/memcpy_mcsafe: Add write-protection-fault
handling"). The new changes to not require a "careful copy" further
de-emphasizes the role that x86-MCA plays in the implementation to just
one more source of recoverable trap during the operation.
With the above realizations the name "mcsafe" is no longer accurate and
copy_safe() is proposed as its replacement. x86 grows a copy_safe_fast()
implementation as a default implementation that is independent of
detecting the presence of x86-MCA.
---
Dan Williams (2):
x86, powerpc: Rename memcpy_mcsafe() to copy_mc_to_{user,kernel}()
x86/copy_mc: Introduce copy_mc_generic()
arch/powerpc/Kconfig | 2
arch/powerpc/include/asm/string.h | 2
arch/powerpc/include/asm/uaccess.h | 40 +++--
arch/powerpc/lib/Makefile | 2
arch/powerpc/lib/copy_mc_64.S | 4
arch/x86/Kconfig | 2
arch/x86/Kconfig.debug | 2
arch/x86/include/asm/copy_mc_test.h | 75 +++++++++
arch/x86/include/asm/mcsafe_test.h | 75 ---------
arch/x86/include/asm/string_64.h | 32 ----
arch/x86/include/asm/uaccess.h | 21 +++
arch/x86/include/asm/uaccess_64.h | 20 --
arch/x86/kernel/cpu/mce/core.c | 8 -
arch/x86/kernel/quirks.c | 9 -
arch/x86/lib/Makefile | 1
arch/x86/lib/copy_mc.c | 64 ++++++++
arch/x86/lib/copy_mc_64.S | 165 ++++++++++++++++++++
arch/x86/lib/memcpy_64.S | 115 --------------
arch/x86/lib/usercopy_64.c | 21 ---
drivers/md/dm-writecache.c | 15 +-
drivers/nvdimm/claim.c | 2
drivers/nvdimm/pmem.c | 6 -
include/linux/string.h | 9 -
include/linux/uaccess.h | 9 +
include/linux/uio.h | 10 +
lib/Kconfig | 7 +
lib/iov_iter.c | 43 +++--
tools/arch/x86/include/asm/mcsafe_test.h | 13 --
tools/arch/x86/lib/memcpy_64.S | 115 --------------
tools/objtool/check.c | 5 -
tools/perf/bench/Build | 1
tools/perf/bench/mem-memcpy-x86-64-lib.c | 24 ---
tools/testing/nvdimm/test/nfit.c | 48 +++---
.../testing/selftests/powerpc/copyloops/.gitignore | 2
tools/testing/selftests/powerpc/copyloops/Makefile | 6 -
.../selftests/powerpc/copyloops/copy_mc_64.S | 1
.../selftests/powerpc/copyloops/memcpy_mcsafe_64.S | 1
37 files changed, 451 insertions(+), 526 deletions(-)
rename arch/powerpc/lib/{memcpy_mcsafe_64.S => copy_mc_64.S} (98%)
create mode 100644 arch/x86/include/asm/copy_mc_test.h
delete mode 100644 arch/x86/include/asm/mcsafe_test.h
create mode 100644 arch/x86/lib/copy_mc.c
create mode 100644 arch/x86/lib/copy_mc_64.S
delete mode 100644 tools/arch/x86/include/asm/mcsafe_test.h
delete mode 100644 tools/perf/bench/mem-memcpy-x86-64-lib.c
create mode 120000 tools/testing/selftests/powerpc/copyloops/copy_mc_64.S
delete mode 120000 tools/testing/selftests/powerpc/copyloops/memcpy_mcsafe_64.S
