[PATCH v4 0/7] target/riscv: Expose RV32 cpu to RV64 QEMU

[LIU Zhiwei <zhiwei_liu@linux.alibaba.com>]

From: TANG Tiancheng <tangtiancheng.ttc@alibaba-inc.com>

This patch set aims to expose 32-bit RISC-V cpu to RV64 QEMU. Thus
qemu-system-riscv64 can directly boot a RV32 Linux.

This patch set has been tested with 6.9.0 Linux Image.
And add an avocado test in tests/avocado.

The recent commit 9b91879b51 ("hw/riscv/virt.c: Make block devices default to virtio")
changed the default behavior of block devices in RISCV Virt. To maintain compatibility
with the new behavior, add the "if=none" parameter to the "-drive" option in the
Avocado test suite.

Changed from:
  '-drive', f'file={rootfs_path},format=raw,id=hd0'
to:
  '-drive', f'file={rootfs_path},format=raw,id=hd0,if=none'

Test rawesult below:
$ make check-avocado AVOCADO_TESTS=/home/developer/qemu/qemu-code-test/qemu/tests/avocado/boot_linux_console.py
...
  AVOCADO tests/avocado
Fetching asset from /home/developer/qemu/qemu-code-test/qemu/tests/avocado/boot_linux_console.py:BootLinuxConsole.test_riscv64_virt_rv32i
Fetching asset from /home/developer/qemu/qemu-code-test/qemu/tests/avocado/boot_linux_console.py:BootLinuxConsole.test_riscv64_virt_rv32i
JOB ID     : fcacf90ad453010550f60d26166911aee2e2a514
JOB LOG    : /home/developer/qemu/qemu-code-test/qemu/build/tests/results/job-2024-07-08T12.30-fcacf90/job.log
 (1/1) /home/developer/qemu/qemu-code-test/qemu/tests/avocado/boot_linux_console.py:BootLinuxConsole.test_riscv64_virt_rv32i: PASS (27.64 s)
RESULTS    : PASS 1 | ERROR 0 | FAIL 0 | SKIP 0 | WARN 0 | INTERRUPT 0 | CANCEL 0
JOB TIME   : 28.39 s

v4:
  Drop UL completely in PATCH v3 2/7, 4/7, 5/7.
  Avocado: Add "if=none" to "-drive" option in QEMU command line

v3:
  Rebase to the master branch

v2:
  Remove the line that was inadvertently left in PATCH v1 4/6.
  Add an avocado test.

v1:
  https://mail.gnu.org/archive/html/qemu-riscv/2024-06/msg00501.html

TANG Tiancheng (7):
  target/riscv: Add fw_dynamic_info32 for booting RV32 OpenSBI
  target/riscv: Adjust PMP size for no-MMU RV64 QEMU running RV32
  target/riscv: Correct SXL return value for RV32 in RV64 QEMU
  target/riscv: Detect sxl to set bit width for RV32 in RV64
  target/riscv: Correct mcause/scause bit width for RV32 in RV64 QEMU
  target/riscv: Enable RV32 CPU support in RV64 QEMU
  tests/avocado: Add an avocado test for riscv64

 configs/targets/riscv64-softmmu.mak |  2 +-
 hw/riscv/boot.c                     | 35 +++++++++++++++++----------
 hw/riscv/sifive_u.c                 |  3 ++-
 include/hw/riscv/boot.h             |  4 +++-
 include/hw/riscv/boot_opensbi.h     | 29 ++++++++++++++++++++++
 target/riscv/cpu.c                  | 17 +++++++++----
 target/riscv/cpu.h                  |  5 +++-
 target/riscv/cpu_helper.c           | 25 +++++++++++++------
 target/riscv/pmp.c                  |  2 +-
 tests/avocado/boot_linux_console.py | 37 +++++++++++++++++++++++++++++
 10 files changed, 131 insertions(+), 28 deletions(-)

-- 
2.43.0