This series is initially targeted at the folks doing filesystems
on top of NVDIMMs. They really want to be able to return -EIO
when there is a h/w error (just like spinning rust, and SSD does).
I plan to use the same infrastructure in parts 1&2 to write a
machine check aware "copy_from_user()" that will SIGBUS the
calling application when a syscall touches poison in user space
(just like we do when the application touches the poison itself).
Changes V1->V2:
0-day: Reported build errors and warnings on 32-bit systems. Fixed
0-day: Reported bloat to tinyconfig. Fixed
Boris: Suggestions to use extra macros to reduce code duplication in _ASM_*EXTABLE. Done
Boris: Re-write "tolerant==3" check to reduce indentation level. See below.
Andy: Check IP is valid before searching kernel exception tables. Done.
Andy: Explain use of BIT(63) on return value from mcsafe_memcpy(). Done (added decode macros).
Andy: Untangle mess of code in tail of do_machine_check() to make it
clear what is going on (e.g. that we only enter the ist_begin_non_atomic()
if we were called from user code, not from kernel!). Done
Tony Luck (3):
x86, ras: Add new infrastructure for machine check fixup tables
2/6] x86, ras: Extend machine check recovery code to annotated ring0
areas
3/6] x86, ras: Add mcsafe_memcpy() function to recover from machine
checks
arch/x86/Kconfig | 4 ++
arch/x86/include/asm/asm.h | 10 +++-
arch/x86/include/asm/uaccess.h | 8 +++
arch/x86/include/asm/uaccess_64.h | 5 ++
arch/x86/kernel/cpu/mcheck/mce-severity.c | 22 +++++++-
arch/x86/kernel/cpu/mcheck/mce.c | 69 +++++++++++------------
arch/x86/kernel/x8664_ksyms_64.c | 2 +
arch/x86/lib/copy_user_64.S | 91 +++++++++++++++++++++++++++++++
arch/x86/mm/extable.c | 19 +++++++
include/asm-generic/vmlinux.lds.h | 6 ++
include/linux/module.h | 1 +
kernel/extable.c | 20 +++++++
12 files changed, 219 insertions(+), 38 deletions(-)
--
2.1.4
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