[v2,00/18] Implements RISC-V WorldGuard extension v0.4

Message

Jim Shu April 17, 2025, 10:52 a.m. UTC

This patchset implements Smwg/Smwgd/Sswg CPU extension and wgChecker
device defined in WorldGuard spec v0.4.

The WG v0.4 spec could be found here:
https://lists.riscv.org/g/security/attachment/711/0/worldguard_rvia_spec-v0.4.pdf

To enable WG in QEMU, pass "wg=on" as machine parameter to virt machine.
It enables both WG CPU CSRs to apply WID of CPU and wgCheckers on
the DRAM, FLASH, and UART to protect these resources.

This patchset contains 5 parts:

1. Commit  1 ~ 2: Bugfix of IOMMUMemoryRegion
2. Commit  3 ~ 4: Extend IOMMUMemoryRegion and MemTxAttr for WG support
3. Commit  5 ~ 13: Add WG global device and CPU extensions
4. Commit 14 ~ 17: Add WG checker device
5. Commit 18: Add WG support to the virt machine

QEMU code can be found at [1]

[1] https://github.com/cwshu/qemu/tree/riscv-wg-v2

Changed since v1:
- Remove the assertion of 4k sections limitation. Remove
  iotlb_to_section() and rename 'xlat_section' to 'xlat'.
- Fix RST issue and typo in virt machine doc

Changed since RFCv1:
- Rebase to latest QEMU (v10.0.0-rc3)
- Add the description of HW config and CPU option of WG in the
  virt machine documentation
- Expose CPU options of WG after WG CPU code has been implemented
- Change 'mwid' and 'mwidlist' options to experimental options
- Change 'world_id' to unsigned int type + bit field.

Jim Shu (18):
  accel/tcg: Store section pointer in CPUTLBEntryFull
  system/physmem: Remove the assertion of page-aligned section number
  accel/tcg: memory access from CPU will pass access_type to IOMMU
  exec: Add RISC-V WorldGuard WID to MemTxAttrs
  hw/misc: riscv_worldguard: Add RISC-V WorldGuard global config
  target/riscv: Add CPU options of WorldGuard CPU extension
  target/riscv: Add hard-coded CPU state of WG extension
  target/riscv: Add defines for WorldGuard CSRs
  target/riscv: Allow global WG config to set WG CPU callbacks
  target/riscv: Implement WorldGuard CSRs
  target/riscv: Add WID to MemTxAttrs of CPU memory transactions
  target/riscv: Expose CPU options of WorldGuard
  hw/misc: riscv_worldguard: Add API to enable WG extension of CPU
  hw/misc: riscv_wgchecker: Implement RISC-V WorldGuard Checker
  hw/misc: riscv_wgchecker: Implement wgchecker slot registers
  hw/misc: riscv_wgchecker: Implement correct block-access behavior
  hw/misc: riscv_wgchecker: Check the slot settings in translate
  hw/riscv: virt: Add WorldGuard support

 accel/tcg/cputlb.c                   |   49 +-
 docs/system/riscv/virt.rst           |   20 +
 hw/misc/Kconfig                      |    3 +
 hw/misc/meson.build                  |    1 +
 hw/misc/riscv_wgchecker.c            | 1160 ++++++++++++++++++++++++++
 hw/misc/riscv_worldguard.c           |  272 ++++++
 hw/misc/trace-events                 |    9 +
 hw/riscv/Kconfig                     |    1 +
 hw/riscv/virt.c                      |  163 +++-
 include/exec/cputlb.h                |   13 +-
 include/exec/exec-all.h              |   18 +-
 include/exec/memattrs.h              |    8 +-
 include/hw/core/cpu.h                |   12 +-
 include/hw/misc/riscv_worldguard.h   |  123 +++
 include/hw/riscv/virt.h              |   15 +-
 system/physmem.c                     |   39 +-
 target/alpha/helper.c                |    2 +-
 target/avr/helper.c                  |    2 +-
 target/hppa/mem_helper.c             |    1 -
 target/i386/tcg/system/excp_helper.c |    3 +-
 target/loongarch/tcg/tlb_helper.c    |    2 +-
 target/m68k/helper.c                 |   10 +-
 target/microblaze/helper.c           |    8 +-
 target/mips/tcg/system/tlb_helper.c  |    4 +-
 target/openrisc/mmu.c                |    2 +-
 target/ppc/mmu_helper.c              |    2 +-
 target/riscv/cpu.c                   |   17 +-
 target/riscv/cpu.h                   |   12 +
 target/riscv/cpu_bits.h              |    5 +
 target/riscv/cpu_cfg.h               |    5 +
 target/riscv/cpu_helper.c            |   69 +-
 target/riscv/csr.c                   |  107 +++
 target/riscv/tcg/tcg-cpu.c           |   11 +
 target/rx/cpu.c                      |    3 +-
 target/s390x/tcg/excp_helper.c       |    2 +-
 target/sh4/helper.c                  |    2 +-
 target/sparc/mmu_helper.c            |    6 +-
 target/tricore/helper.c              |    2 +-
 target/xtensa/helper.c               |    3 +-
 39 files changed, 2074 insertions(+), 112 deletions(-)
 create mode 100644 hw/misc/riscv_wgchecker.c
 create mode 100644 hw/misc/riscv_worldguard.c
 create mode 100644 include/hw/misc/riscv_worldguard.h