linux-kernel - [PATCH v6 0/8] powerpc/watchpoint: Bug fixes plus new feature flag

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Message-Id: <20200902042945.129369-1-ravi.bangoria@linux.ibm.com>
Date:   Wed,  2 Sep 2020 09:59:37 +0530
From:   Ravi Bangoria <ravi.bangoria@...ux.ibm.com>
To:     mpe@...erman.id.au, christophe.leroy@....fr
Cc:     ravi.bangoria@...ux.ibm.com, mikey@...ling.org, paulus@...ba.org,
        naveen.n.rao@...ux.vnet.ibm.com, pedromfc@...ux.ibm.com,
        rogealve@...ux.ibm.com, jniethe5@...il.com,
        linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Subject: [PATCH v6 0/8] powerpc/watchpoint: Bug fixes plus new feature flag

Patch #1 fixes issue for quardword instruction on p10 predecessors.
Patch #2 fixes issue for vector instructions.
Patch #3 fixes a bug about watchpoint not firing when created with
         ptrace PPC_PTRACE_SETHWDEBUG and CONFIG_HAVE_HW_BREAKPOINT=N.
         The fix uses HW_BRK_TYPE_PRIV_ALL for ptrace user which, I
         guess, should be fine because we don't leak any kernel
         addresses and PRIV_ALL will also help to cover scenarios when
         kernel accesses user memory.
Patch #4,#5 fixes infinite exception bug, again the bug happens only
         with CONFIG_HAVE_HW_BREAKPOINT=N.
Patch #6 fixes two places where we are missing to set hw_len.
Patch #7 introduce new feature bit PPC_DEBUG_FEATURE_DATA_BP_ARCH_31
         which will be set when running on ISA 3.1 compliant machine.
Patch #8 finally adds selftest to test scenarios fixed by patch#2,#3
         and also moves MODE_EXACT tests outside of BP_RANGE condition.

Christophe, let me know if this series breaks something for 8xx.

v5: https://lore.kernel.org/r/20200825043617.1073634-1-ravi.bangoria@linux.ibm.com

v5->v6:
 - Fix build faulure reported by kernel test robot
 - patch #5. Use more compact if condition, suggested by Christophe


Ravi Bangoria (8):
  powerpc/watchpoint: Fix quarword instruction handling on p10
    predecessors
  powerpc/watchpoint: Fix handling of vector instructions
  powerpc/watchpoint/ptrace: Fix SETHWDEBUG when
    CONFIG_HAVE_HW_BREAKPOINT=N
  powerpc/watchpoint: Move DAWR detection logic outside of
    hw_breakpoint.c
  powerpc/watchpoint: Fix exception handling for
    CONFIG_HAVE_HW_BREAKPOINT=N
  powerpc/watchpoint: Add hw_len wherever missing
  powerpc/watchpoint/ptrace: Introduce PPC_DEBUG_FEATURE_DATA_BP_ARCH_31
  powerpc/watchpoint/selftests: Tests for kernel accessing user memory

 Documentation/powerpc/ptrace.rst              |   1 +
 arch/powerpc/include/asm/hw_breakpoint.h      |  12 ++
 arch/powerpc/include/uapi/asm/ptrace.h        |   1 +
 arch/powerpc/kernel/Makefile                  |   3 +-
 arch/powerpc/kernel/hw_breakpoint.c           | 149 +---------------
 .../kernel/hw_breakpoint_constraints.c        | 162 ++++++++++++++++++
 arch/powerpc/kernel/process.c                 |  48 ++++++
 arch/powerpc/kernel/ptrace/ptrace-noadv.c     |   9 +-
 arch/powerpc/xmon/xmon.c                      |   1 +
 .../selftests/powerpc/ptrace/ptrace-hwbreak.c |  48 +++++-
 10 files changed, 282 insertions(+), 152 deletions(-)
 create mode 100644 arch/powerpc/kernel/hw_breakpoint_constraints.c

-- 
2.26.2