[PATCH v8 0/5] support subsets of virtual memory extension

[Weiwei Li <liweiwei@iscas.ac.cn>]

This patchset implements virtual memory related RISC-V extensions: Svnapot version 1.0, Svinval vesion 1.0, Svpbmt version 1.0. 

Specification:
https://github.com/riscv/virtual-memory/tree/main/specs

The port is available here:
https://github.com/plctlab/plct-qemu/tree/plct-virtmem-upstream-v8

To test this implementation, specify cpu argument with 'svinval=true,svnapot=true,svpbmt=true'.

This implementation can pass the riscv-tests for rv64ssvnapot.

v8:
* rebase on https://lore.kernel.org/qemu-devel/20220131110201.2303275-1-philipp.tomsich@vrull.eu/
* move variables to tops of function
* add ULL for PTE_N and PTE_PMBT
* add mask variable for napot_bits

v7:
* delete definition of PTE_PPN_MASK for TARGET_RISCV32
* make riscv_cpu_sxl works for user mode
* add commit msg for patch 2

v6:
* select ppn mask base on sxl

v5:
* merge patch https://lore.kernel.org/qemu-devel/1569456861-8502-1-git-send-email-guoren@kernel.org/
* relax pte attribute check

v4:
* fix encodings for hinval_vvma and hinval_gvma
* partition inner PTE check into several steps
* improve commit messages to describe changes

v3:
* drop "x-" in exposed properties

v2:
* add extension check for svnapot and svpbmt


Guo Ren (1):
  target/riscv: Ignore reserved bits in PTE for RV64

Weiwei Li (4):
  target/riscv: add PTE_A/PTE_D/PTE_U bits check for inner PTE
  target/riscv: add support for svnapot extension
  target/riscv: add support for svinval extension
  target/riscv: add support for svpbmt extension

 target/riscv/cpu.c                          |  4 ++
 target/riscv/cpu.h                          | 16 +++++
 target/riscv/cpu_bits.h                     |  6 ++
 target/riscv/cpu_helper.c                   | 34 +++++++++-
 target/riscv/insn32.decode                  |  7 ++
 target/riscv/insn_trans/trans_svinval.c.inc | 75 +++++++++++++++++++++
 target/riscv/translate.c                    |  1 +
 7 files changed, 140 insertions(+), 3 deletions(-)
 create mode 100644 target/riscv/insn_trans/trans_svinval.c.inc

-- 
2.17.1