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[PATCH v7 16/25] target/riscv: Set MMU_2STAGE_BIT in riscv_cpu_mmu_index
From: |
Richard Henderson |
Subject: |
[PATCH v7 16/25] target/riscv: Set MMU_2STAGE_BIT in riscv_cpu_mmu_index |
Date: |
Wed, 12 Apr 2023 13:43:24 +0200 |
Incorporate the virt_enabled and MPV checks into the cpu_mmu_index
function, so we don't have to keep doing it within tlb_fill and
subroutines. This also elides a flush on changes to MPV.
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Reviewed-by: Weiwei Li <liweiwei@iscas.ac.cn>
Tested-by: Daniel Henrique Barboza <dbarboza@ventanamicro.com>
Message-Id: <20230325105429.1142530-17-richard.henderson@linaro.org>
---
target/riscv/cpu_helper.c | 49 ++++++++++++++-------------------------
target/riscv/csr.c | 6 +----
2 files changed, 18 insertions(+), 37 deletions(-)
diff --git a/target/riscv/cpu_helper.c b/target/riscv/cpu_helper.c
index ccba3c45e7..baa4b3a1d2 100644
--- a/target/riscv/cpu_helper.c
+++ b/target/riscv/cpu_helper.c
@@ -37,19 +37,21 @@ int riscv_cpu_mmu_index(CPURISCVState *env, bool ifetch)
#ifdef CONFIG_USER_ONLY
return 0;
#else
- if (ifetch) {
- return env->priv;
- }
+ bool virt = env->virt_enabled;
+ int mode = env->priv;
/* All priv -> mmu_idx mapping are here */
- int mode = env->priv;
- if (mode == PRV_M && get_field(env->mstatus, MSTATUS_MPRV)) {
- mode = get_field(env->mstatus, MSTATUS_MPP);
+ if (!ifetch) {
+ if (mode == PRV_M && get_field(env->mstatus, MSTATUS_MPRV)) {
+ mode = get_field(env->mstatus, MSTATUS_MPP);
+ virt = get_field(env->mstatus, MSTATUS_MPV);
+ }
+ if (mode == PRV_S && get_field(env->mstatus, MSTATUS_SUM)) {
+ mode = MMUIdx_S_SUM;
+ }
}
- if (mode == PRV_S && get_field(env->mstatus, MSTATUS_SUM)) {
- return MMUIdx_S_SUM;
- }
- return mode;
+
+ return mode | (virt ? MMU_2STAGE_BIT : 0);
#endif
}
@@ -1162,7 +1164,7 @@ void riscv_cpu_do_transaction_failed(CPUState *cs, hwaddr
physaddr,
}
env->badaddr = addr;
- env->two_stage_lookup = env->virt_enabled || mmuidx_2stage(mmu_idx);
+ env->two_stage_lookup = mmuidx_2stage(mmu_idx);
env->two_stage_indirect_lookup = false;
cpu_loop_exit_restore(cs, retaddr);
}
@@ -1187,7 +1189,7 @@ void riscv_cpu_do_unaligned_access(CPUState *cs, vaddr
addr,
g_assert_not_reached();
}
env->badaddr = addr;
- env->two_stage_lookup = env->virt_enabled || mmuidx_2stage(mmu_idx);
+ env->two_stage_lookup = mmuidx_2stage(mmu_idx);
env->two_stage_indirect_lookup = false;
cpu_loop_exit_restore(cs, retaddr);
}
@@ -1225,7 +1227,7 @@ bool riscv_cpu_tlb_fill(CPUState *cs, vaddr address, int
size,
int prot, prot2, prot_pmp;
bool pmp_violation = false;
bool first_stage_error = true;
- bool two_stage_lookup = false;
+ bool two_stage_lookup = mmuidx_2stage(mmu_idx);
bool two_stage_indirect_error = false;
int ret = TRANSLATE_FAIL;
int mode = mmu_idx;
@@ -1237,24 +1239,8 @@ bool riscv_cpu_tlb_fill(CPUState *cs, vaddr address, int
size,
qemu_log_mask(CPU_LOG_MMU, "%s ad %" VADDR_PRIx " rw %d mmu_idx %d\n",
__func__, address, access_type, mmu_idx);
- /*
- * MPRV does not affect the virtual-machine load/store
- * instructions, HLV, HLVX, and HSV.
- */
- if (mmuidx_2stage(mmu_idx)) {
- ;
- } else if (mode == PRV_M && access_type != MMU_INST_FETCH &&
- get_field(env->mstatus, MSTATUS_MPRV)) {
- mode = get_field(env->mstatus, MSTATUS_MPP);
- if (riscv_has_ext(env, RVH) && get_field(env->mstatus, MSTATUS_MPV)) {
- two_stage_lookup = true;
- }
- }
-
pmu_tlb_fill_incr_ctr(cpu, access_type);
- if (env->virt_enabled ||
- ((mmuidx_2stage(mmu_idx) || two_stage_lookup) &&
- access_type != MMU_INST_FETCH)) {
+ if (two_stage_lookup) {
/* Two stage lookup */
ret = get_physical_address(env, &pa, &prot, address,
&env->guest_phys_fault_addr, access_type,
@@ -1350,8 +1336,7 @@ bool riscv_cpu_tlb_fill(CPUState *cs, vaddr address, int
size,
return false;
} else {
raise_mmu_exception(env, address, access_type, pmp_violation,
- first_stage_error,
- env->virt_enabled || mmuidx_2stage(mmu_idx),
+ first_stage_error, two_stage_lookup,
two_stage_indirect_error);
cpu_loop_exit_restore(cs, retaddr);
}
diff --git a/target/riscv/csr.c b/target/riscv/csr.c
index 124be448dc..211acad5ae 100644
--- a/target/riscv/csr.c
+++ b/target/riscv/csr.c
@@ -1270,7 +1270,7 @@ static RISCVException write_mstatus(CPURISCVState *env,
int csrno,
val = legalize_mpp(env, get_field(mstatus, MSTATUS_MPP), val);
/* flush tlb on mstatus fields that affect VM */
- if ((val ^ mstatus) & (MSTATUS_MXR | MSTATUS_MPV)) {
+ if ((val ^ mstatus) & MSTATUS_MXR) {
tlb_flush(env_cpu(env));
}
mask = MSTATUS_SIE | MSTATUS_SPIE | MSTATUS_MIE | MSTATUS_MPIE |
@@ -1318,10 +1318,6 @@ static RISCVException write_mstatush(CPURISCVState *env,
int csrno,
uint64_t valh = (uint64_t)val << 32;
uint64_t mask = MSTATUS_MPV | MSTATUS_GVA;
- if ((valh ^ env->mstatus) & (MSTATUS_MPV)) {
- tlb_flush(env_cpu(env));
- }
-
env->mstatus = (env->mstatus & ~mask) | (valh & mask);
return RISCV_EXCP_NONE;
--
2.34.1
- [PATCH v7 14/25] target/riscv: Introduce mmuidx_2stage, (continued)
- [PATCH v7 14/25] target/riscv: Introduce mmuidx_2stage, Richard Henderson, 2023/04/12
- [PATCH v7 08/25] accel/tcg: Add cpu_ld*_code_mmu, Richard Henderson, 2023/04/12
- [PATCH v7 06/25] target/riscv: Separate priv from mmu_idx, Richard Henderson, 2023/04/12
- [PATCH v7 02/25] target/riscv: Add a general status enum for extensions, Richard Henderson, 2023/04/12
- [PATCH v7 05/25] target/riscv: Add a tb flags field for vstart, Richard Henderson, 2023/04/12
- [PATCH v7 07/25] target/riscv: Reduce overhead of MSTATUS_SUM change, Richard Henderson, 2023/04/12
- [PATCH v7 09/25] target/riscv: Use cpu_ld*_code_mmu for HLVX, Richard Henderson, 2023/04/12
- [PATCH v7 11/25] target/riscv: Rename MMU_HYP_ACCESS_BIT to MMU_2STAGE_BIT, Richard Henderson, 2023/04/12
- [PATCH v7 15/25] target/riscv: Move hstatus.spvp check to check_access_hlsv, Richard Henderson, 2023/04/12
- [PATCH v7 19/25] target/riscv: Hoist pbmte and hade out of the level loop, Richard Henderson, 2023/04/12
- [PATCH v7 16/25] target/riscv: Set MMU_2STAGE_BIT in riscv_cpu_mmu_index,
Richard Henderson <=
- [PATCH v7 17/25] target/riscv: Check SUM in the correct register, Richard Henderson, 2023/04/12
- [PATCH v7 18/25] target/riscv: Hoist second stage mode change to callers, Richard Henderson, 2023/04/12
- [PATCH v7 21/25] target/riscv: Suppress pte update with is_debug, Richard Henderson, 2023/04/12
- [PATCH v7 22/25] target/riscv: Don't modify SUM with is_debug, Richard Henderson, 2023/04/12
- [PATCH v7 24/25] target/riscv: Reorg access check in get_physical_address, Richard Henderson, 2023/04/12
- [PATCH v7 20/25] target/riscv: Move leaf pte processing out of level loop, Richard Henderson, 2023/04/12
- [PATCH v7 23/25] target/riscv: Merge checks for reserved pte flags, Richard Henderson, 2023/04/12
- [PATCH v7 25/25] target/riscv: Reorg sum check in get_physical_address, Richard Henderson, 2023/04/12
- Re: [PATCH v7 00/25] target/riscv: MSTATUS_SUM + cleanups, Alistair Francis, 2023/04/16