Follow the Svukte spec, do the memory access address checking 1. Include instruction fetches or explicit memory accesses 2. System run in effective privilege U or VU 3. Check senvcfg[UKTE] being set, or hstatus[HUKTE] being set if instruction is HLV, HLVX, HSV and execute from U mode to VU mode 4. Depend on Sv39 and check virtual addresses bit[SXLEN-1] 5. Raises a page-fault exception corresponding to the original access type.
Ref: https://github.com/riscv/riscv-isa-manual/pull/1564/files Signed-off-by: Frank Chang <frank.ch...@sifive.com> Signed-off-by: Fea.Wang <fea.w...@sifive.com> Signed-off-by: Daniel Henrique Barboza <dbarb...@ventanamicro.com> Reviewed-by: Jim Shu <jim....@sifive.com> Reviewed-by: Daniel Henrique Barboza <dbarb...@ventanamicro.com> Reviewed-by: Alistair Francis <alistair.fran...@wdc.com> --- target/riscv/cpu_helper.c | 55 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 55 insertions(+) diff --git a/target/riscv/cpu_helper.c b/target/riscv/cpu_helper.c index 0a3ead69ea..edb106b8a0 100644 --- a/target/riscv/cpu_helper.c +++ b/target/riscv/cpu_helper.c @@ -857,6 +857,55 @@ static int get_physical_address_pmp(CPURISCVState *env, int *prot, hwaddr addr, return TRANSLATE_SUCCESS; } +/* Returns 'true' if a svukte address check is needed */ +static bool do_svukte_check(CPURISCVState *env, bool first_stage, + int mode, bool virt) +{ + /* Svukte extension depends on Sv39. */ + if (!(env_archcpu(env)->cfg.ext_svukte || + !first_stage || + VM_1_10_SV39 != get_field(env->satp, SATP64_MODE))) { + return false; + } + + /* + * Check hstatus.HUKTE if the effective mode is switched to VU-mode by + * executing HLV/HLVX/HSV in U-mode. + * For other cases, check senvcfg.UKTE. + */ + if (env->priv == PRV_U && !env->virt_enabled && virt) { + if (!get_field(env->hstatus, HSTATUS_HUKTE)) { + return false; + } + } else if (!get_field(env->senvcfg, SENVCFG_UKTE)) { + return false; + } + + /* + * Svukte extension is qualified only in U or VU-mode. + * + * Effective mode can be switched to U or VU-mode by: + * - M-mode + mstatus.MPRV=1 + mstatus.MPP=U-mode. + * - Execute HLV/HLVX/HSV from HS-mode + hstatus.SPVP=0. + * - U-mode. + * - VU-mode. + * - Execute HLV/HLVX/HSV from U-mode + hstatus.HU=1. + */ + if (mode != PRV_U) { + return false; + } + + return true; +} + +static bool check_svukte_addr(CPURISCVState *env, vaddr addr) +{ + /* svukte extension excludes RV32 */ + uint32_t sxlen = 32 * riscv_cpu_sxl(env); + uint64_t high_bit = addr & (1UL << (sxlen - 1)); + return !high_bit; +} + /* * get_physical_address - get the physical address for this virtual address * @@ -894,6 +943,7 @@ static int get_physical_address(CPURISCVState *env, hwaddr *physical, MemTxResult res; MemTxAttrs attrs = MEMTXATTRS_UNSPECIFIED; int mode = mmuidx_priv(mmu_idx); + bool virt = mmuidx_2stage(mmu_idx); bool use_background = false; hwaddr ppn; int napot_bits = 0; @@ -901,6 +951,11 @@ static int get_physical_address(CPURISCVState *env, hwaddr *physical, bool is_sstack_idx = ((mmu_idx & MMU_IDX_SS_WRITE) == MMU_IDX_SS_WRITE); bool sstack_page = false; + if (do_svukte_check(env, first_stage, mode, virt) && + !check_svukte_addr(env, addr)) { + return TRANSLATE_FAIL; + } + /* * Check if we should use the background registers for the two * stage translation. We don't need to check if we actually need -- 2.34.1
