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Ivan Klokov 1a25e59c62 target/riscv: pmp: Ignore writes when RW=01 and MML=0 
This patch changes behavior on writing RW=01 to pmpcfg with MML=0.
RWX filed is form of collective WARL with the combination of
pmpcfg.RW=01 remains reserved for future standard use.

According to definition of WARL writing the CSR has no other side
effect. But current implementation change architectural state and
change system behavior. After writing we will get unreadable-unwriteble
region regardless on the previous state.

On the other side WARL said that we should read legal value and nothing
says about what we should write. Current behavior change system state
regardless of whether we read this register or not.

Fixes: ac66f2f0 ("target/riscv: pmp: Ignore writes when RW=01")

Signed-off-by: Ivan Klokov <ivan.klokov@syntacore.com>
Reviewed-by: Daniel Henrique Barboza <dbarboza@ventanamicro.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Message-ID: <20231220153205.11072-1-ivan.klokov@syntacore.com>
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
2024-01-10 18:47:47 +10:00
..
alpha target/alpha: Use generic cpu_list() 2024-01-05 16:20:14 +01:00
arm Replace "iothread lock" with "BQL" in comments 2024-01-08 10:45:43 -05:00
avr target/avr: Use generic cpu_list() 2024-01-05 16:20:14 +01:00
cris target/cris: Use generic cpu_list() 2024-01-05 16:20:14 +01:00
hexagon target/hexagon: Use generic cpu_list() 2024-01-05 16:20:14 +01:00
hppa system/cpus: rename qemu_mutex_lock_iothread() to bql_lock() 2024-01-08 10:45:43 -05:00
i386 qemu/main-loop: rename qemu_cond_wait_iothread() to qemu_cond_wait_bql() 2024-01-08 10:45:43 -05:00
loongarch system/cpus: rename qemu_mutex_lock_iothread() to bql_lock() 2024-01-08 10:45:43 -05:00
m68k target/m68k: Use generic cpu_list() 2024-01-05 16:20:14 +01:00
microblaze target/microblaze: Constify VMState in machine.c 2023-12-29 11:17:30 +11:00
mips system/cpus: rename qemu_mutex_lock_iothread() to bql_lock() 2024-01-08 10:45:43 -05:00
nios2 target: Move ArchCPUClass definition to 'cpu.h' 2023-11-07 13:08:48 +01:00
openrisc system/cpus: rename qemu_mutex_lock_iothread() to bql_lock() 2024-01-08 10:45:43 -05:00
ppc qemu/main-loop: rename QEMU_IOTHREAD_LOCK_GUARD to BQL_LOCK_GUARD 2024-01-08 10:45:43 -05:00
riscv target/riscv: pmp: Ignore writes when RW=01 and MML=0 2024-01-10 18:47:47 +10:00
rx target/rx: Use generic cpu_list() 2024-01-05 16:20:14 +01:00
s390x system/cpus: rename qemu_mutex_lock_iothread() to bql_lock() 2024-01-08 10:45:43 -05:00
sh4 target/sh4: Use generic cpu_list() 2024-01-05 16:20:14 +01:00
sparc system/cpus: rename qemu_mutex_lock_iothread() to bql_lock() 2024-01-08 10:45:43 -05:00
tricore target/tricore: Use generic cpu_list() 2024-01-05 16:20:14 +01:00
xtensa system/cpus: rename qemu_mutex_lock_iothread() to bql_lock() 2024-01-08 10:45:43 -05:00
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