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[Qemu-devel] [PATCH v2 00/26] target/arm: Implement ARMv8.5-MemTag

From: Richard Henderson
Subject: [Qemu-devel] [PATCH v2 00/26] target/arm: Implement ARMv8.5-MemTag
Date: Sun, 10 Feb 2019 17:08:03 -0800

Based-on: <address@hidden>
aka "[PATCH v3 0/4] target/arm: Implement ARMv8.5-BTI".

The full tree is available at

  https://github.org/rth7680/qemu.git tgt-arm-mte

Changes since v1:

* Updates to a newer revision of the spec.  I know there is still work to
  do here: another argument to STG, ST2G, and a new STZGM insn.

* User emulation adds an x-tagged-pages property.  Without that, all pages
  are MemAttr != Tagged and so all accesses unchecked.  I am not turning
  off SCTLR_EL1.ATA0, so even without x-tagged-pages the program has access
  to tag generation (e.g. the IRG insn).

* System emulation is new, though effectively untested.  I need to fiddle
  around with the kernel to see what I can put together there.

  What I can see is:

  address-space: cpu-tag-memory-0
    0000000000000000-07fffffffffffffe (prio 0, i/o): tag-memory
      0000000002000000-0000000009ffffff (prio 0, ram): mach-virt.tag

  address-space: cpu-memory-0
    0000000000000000-ffffffffffffffff (prio 0, i/o): system
      0000000040000000-000000013fffffff (prio 0, ram): mach-virt.ram

* New checks for alignment and page permissions before allowing
  access to the tag memory.


Richard Henderson (26):
  target/arm: Split out arm_sctlr
  target/arm: Split helper_msr_i_pstate into 3
  target/arm: Add clear_pstate_bits, share gen_ss_advance
  target/arm: Add MTE_ACTIVE to tb_flags
  target/arm: Extract TCMA with ARMVAParameters
  target/arm: Add MTE system registers
  target/arm: Assert no manual change to CACHED_PSTATE_BITS
  target/arm: Fill in helper_mte_check
  target/arm: Suppress tag check for sp+offset
  target/arm: Implement the IRG instruction
  target/arm: Implement ADDG, SUBG instructions
  target/arm: Implement the GMI instruction
  target/arm: Implement the SUBP instruction
  target/arm: Define arm_cpu_do_unaligned_access for CONFIG_USER_ONLY
  target/arm: Implement LDG, STG, ST2G instructions
  target/arm: Implement the STGP instruction
  target/arm: Implement the access tag cache flushes
  target/arm: Implement data cache set allocation tags
  target/arm: Set PSTATE.TCO on exception entry
  tcg: Introduce target-specific page data for user-only
  target/arm: Cache the Tagged bit for a page in MemTxAttrs
  target/arm: Create tagged ram when MTE is enabled
  target/arm: Add allocation tag storage for user mode
  target/arm: Add allocation tag storage for system mode
  target/arm: Enable MTE
  tests/tcg/aarch64: Add mte smoke tests

 include/exec/cpu-all.h            |  10 +-
 target/arm/cpu.h                  |  52 ++-
 target/arm/helper-a64.h           |  15 +
 target/arm/helper.h               |   3 -
 target/arm/internals.h            |  37 +++
 target/arm/translate.h            |  36 ++
 accel/tcg/translate-all.c         |  28 ++
 hw/arm/virt.c                     |  33 ++
 linux-user/mmap.c                 |  10 +-
 linux-user/syscall.c              |   4 +-
 target/arm/cpu.c                  |  31 +-
 target/arm/cpu64.c                |  19 ++
 target/arm/helper-a64.c           |  30 ++
 target/arm/helper.c               | 208 ++++++++++--
 target/arm/mte_helper.c           | 529 ++++++++++++++++++++++++++++++
 target/arm/op_helper.c            |  80 +----
 target/arm/translate-a64.c        | 352 ++++++++++++++++----
 target/arm/translate.c            |  11 -
 tests/tcg/aarch64/mte-1.c         |  27 ++
 tests/tcg/aarch64/mte-2.c         |  39 +++
 target/arm/Makefile.objs          |   2 +-
 tests/tcg/aarch64/Makefile.target |   4 +
 22 files changed, 1360 insertions(+), 200 deletions(-)
 create mode 100644 target/arm/mte_helper.c
 create mode 100644 tests/tcg/aarch64/mte-1.c
 create mode 100644 tests/tcg/aarch64/mte-2.c


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