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target/riscv: Ignore reserved bits in PTE for RV64

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Highest bits of PTE has been used for svpbmt, ref: [1], [2], so we
need to ignore them. They cannot be a part of ppn.

1: The RISC-V Instruction Set Manual, Volume II: Privileged Architecture
   4.4 Sv39: Page-Based 39-bit Virtual-Memory System
   4.5 Sv48: Page-Based 48-bit Virtual-Memory System

2: https://github.com/riscv/virtual-memory/blob/main/specs/663-Svpbmt-diff.pdf

Signed-off-by: Guo Ren <ren_guo@c-sky.com>
Reviewed-by: Liu Zhiwei <zhiwei_liu@c-sky.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Cc: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Message-Id: <20220204022658.18097-2-liweiwei@iscas.ac.cn>
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
This commit is contained in:
Guo Ren 2022-02-04 10:26:54 +08:00 committed by Alistair Francis
parent e8f79343cf
commit 05e6ca5e15
3 changed files with 30 additions and 1 deletions
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15
target/riscv/cpu.h
View File

@ -359,6 +359,8 @@ struct RISCVCPUConfig {
bool ext_counters;
bool ext_ifencei;
bool ext_icsr;
bool ext_svnapot;
bool ext_svpbmt;
bool ext_zfh;
bool ext_zfhmin;
bool ext_zve32f;
@ -558,6 +560,19 @@ static inline int riscv_cpu_xlen(CPURISCVState *env)
return 16 << env->xl;
}
#ifdef TARGET_RISCV32
#define riscv_cpu_sxl(env) ((void)(env), MXL_RV32)
#else
static inline RISCVMXL riscv_cpu_sxl(CPURISCVState *env)
{
#ifdef CONFIG_USER_ONLY
return env->misa_mxl;
#else
return get_field(env->mstatus, MSTATUS64_SXL);
#endif
}
#endif
/*
* Encode LMUL to lmul as follows:
* LMUL vlmul lmul

3
target/riscv/cpu_bits.h
View File

@ -565,6 +565,9 @@ typedef enum {
/* Page table PPN shift amount */
#define PTE_PPN_SHIFT 10
/* Page table PPN mask */
#define PTE_PPN_MASK 0x3FFFFFFFFFFC00ULL
/* Leaf page shift amount */
#define PGSHIFT 12

13
target/riscv/cpu_helper.c
View File

@ -751,6 +751,8 @@ static int get_physical_address(CPURISCVState *env, hwaddr *physical,
MemTxAttrs attrs = MEMTXATTRS_UNSPECIFIED;
int mode = mmu_idx & TB_FLAGS_PRIV_MMU_MASK;
bool use_background = false;
hwaddr ppn;
RISCVCPU *cpu = env_archcpu(env);
/*
* Check if we should use the background registers for the two
@ -919,7 +921,16 @@ restart:
return TRANSLATE_FAIL;
}
hwaddr ppn = pte >> PTE_PPN_SHIFT;
if (riscv_cpu_sxl(env) == MXL_RV32) {
ppn = pte >> PTE_PPN_SHIFT;
} else if (cpu->cfg.ext_svpbmt || cpu->cfg.ext_svnapot) {
ppn = (pte & (target_ulong)PTE_PPN_MASK) >> PTE_PPN_SHIFT;
} else {
ppn = pte >> PTE_PPN_SHIFT;
if ((pte & ~(target_ulong)PTE_PPN_MASK) >> PTE_PPN_SHIFT) {
return TRANSLATE_FAIL;
}
}
if (!(pte & PTE_V)) {
/* Invalid PTE */