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target/riscv: Do two-stage lookups on hlv/hlvx/hsv instructions

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Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
Message-id: 024ad8a594fb2feaf0950fbfad1508cfa82ce7f0.1597259519.git.alistair.francis@wdc.com
Message-Id: <024ad8a594fb2feaf0950fbfad1508cfa82ce7f0.1597259519.git.alistair.francis@wdc.com>
This commit is contained in:
Alistair Francis 2020-08-12 12:13:22 -07:00
parent 8c5362acb5
commit 29b3361b14
1 changed files with 25 additions and 35 deletions
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60
target/riscv/cpu_helper.c
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@ -340,22 +340,13 @@ static int get_physical_address(CPURISCVState *env, hwaddr *physical,
* was called. Background registers will be used if the guest has
* forced a two stage translation to be on (in HS or M mode).
*/
if (riscv_cpu_two_stage_lookup(env) && access_type != MMU_INST_FETCH) {
use_background = true;
}
if (mode == PRV_M && access_type != MMU_INST_FETCH) {
if (get_field(env->mstatus, MSTATUS_MPRV)) {
mode = get_field(env->mstatus, MSTATUS_MPP);
if (riscv_has_ext(env, RVH) &&
MSTATUS_MPV_ISSET(env)) {
use_background = true;
}
}
}
if (mode == PRV_S && access_type != MMU_INST_FETCH &&
riscv_has_ext(env, RVH) && !riscv_cpu_virt_enabled(env)) {
if (get_field(env->hstatus, HSTATUS_SPRV)) {
mode = get_field(env->mstatus, SSTATUS_SPP);
use_background = true;
}
}
@ -608,7 +599,8 @@ static void raise_mmu_exception(CPURISCVState *env, target_ulong address,
}
break;
case MMU_DATA_LOAD:
if (riscv_cpu_virt_enabled(env) && !first_stage) {
if ((riscv_cpu_virt_enabled(env) || riscv_cpu_two_stage_lookup(env)) &&
!first_stage) {
cs->exception_index = RISCV_EXCP_LOAD_GUEST_ACCESS_FAULT;
} else {
cs->exception_index = page_fault_exceptions ?
@ -616,7 +608,8 @@ static void raise_mmu_exception(CPURISCVState *env, target_ulong address,
}
break;
case MMU_DATA_STORE:
if (riscv_cpu_virt_enabled(env) && !first_stage) {
if ((riscv_cpu_virt_enabled(env) || riscv_cpu_two_stage_lookup(env)) &&
!first_stage) {
cs->exception_index = RISCV_EXCP_STORE_GUEST_AMO_ACCESS_FAULT;
} else {
cs->exception_index = page_fault_exceptions ?
@ -706,8 +699,6 @@ bool riscv_cpu_tlb_fill(CPUState *cs, vaddr address, int size,
hwaddr pa = 0;
int prot, prot2;
bool pmp_violation = false;
bool m_mode_two_stage = false;
bool hs_mode_two_stage = false;
bool first_stage_error = true;
int ret = TRANSLATE_FAIL;
int mode = mmu_idx;
@ -718,30 +709,21 @@ 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);
/*
* Determine if we are in M mode and MPRV is set or in HS mode and SPRV is
* set and we want to access a virtulisation address.
*/
if (riscv_has_ext(env, RVH)) {
m_mode_two_stage = env->priv == PRV_M &&
access_type != MMU_INST_FETCH &&
get_field(env->mstatus, MSTATUS_MPRV) &&
MSTATUS_MPV_ISSET(env);
hs_mode_two_stage = env->priv == PRV_S &&
!riscv_cpu_virt_enabled(env) &&
access_type != MMU_INST_FETCH &&
get_field(env->hstatus, HSTATUS_SPRV) &&
get_field(env->hstatus, HSTATUS_SPV);
}
if (mode == PRV_M && access_type != MMU_INST_FETCH) {
if (get_field(env->mstatus, MSTATUS_MPRV)) {
mode = get_field(env->mstatus, MSTATUS_MPP);
}
}
if (riscv_cpu_virt_enabled(env) || m_mode_two_stage || hs_mode_two_stage) {
if (riscv_has_ext(env, RVH) && env->priv == PRV_M &&
access_type != MMU_INST_FETCH &&
get_field(env->mstatus, MSTATUS_MPRV) &&
MSTATUS_MPV_ISSET(env)) {
riscv_cpu_set_two_stage_lookup(env, true);
}
if (riscv_cpu_virt_enabled(env) ||
(riscv_cpu_two_stage_lookup(env) && access_type != MMU_INST_FETCH)) {
/* Two stage lookup */
ret = get_physical_address(env, &pa, &prot, address, access_type,
mmu_idx, true, true);
@ -793,6 +775,14 @@ bool riscv_cpu_tlb_fill(CPUState *cs, vaddr address, int size,
__func__, address, ret, pa, prot);
}
/* We did the two stage lookup based on MPRV, unset the lookup */
if (riscv_has_ext(env, RVH) && env->priv == PRV_M &&
access_type != MMU_INST_FETCH &&
get_field(env->mstatus, MSTATUS_MPRV) &&
MSTATUS_MPV_ISSET(env)) {
riscv_cpu_set_two_stage_lookup(env, false);
}
if (riscv_feature(env, RISCV_FEATURE_PMP) &&
(ret == TRANSLATE_SUCCESS) &&
!pmp_hart_has_privs(env, pa, size, 1 << access_type, mode)) {