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X-Received-From: 2607:f8b0:400e:c00::241 Subject: [Qemu-devel] [PATCH v8 32/35] RISC-V: Implement mstatus.TSR/TW/TVM X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Matthew Suozzo , Sagar Karandikar , Bastian Koppelmann , Palmer Dabbelt , Michael Clark , Alistair Francis , patches@groups.riscv.org Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) X-ZohoMail: RDKM_2 RSF_0 Z_629925259 SPT_0 Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" This adds the necessary minimum to support S-mode virtualization for priv ISA >=3D v1.10 Cc: Sagar Karandikar Cc: Bastian Koppelmann Cc: Palmer Dabbelt Cc: Alistair Francis Cc: Matthew Suozzo Signed-off-by: Michael Clark Co-authored-by: Matthew Suozzo Co-authored-by: Michael Clark --- target/riscv/csr.c | 17 +++++++++++++---- target/riscv/op_helper.c | 25 +++++++++++++++++++++---- 2 files changed, 34 insertions(+), 8 deletions(-) diff --git a/target/riscv/csr.c b/target/riscv/csr.c index e005285..da66908 100644 --- a/target/riscv/csr.c +++ b/target/riscv/csr.c @@ -313,7 +313,8 @@ static int write_mstatus(CPURISCVState *env, int csrno,= target_ulong val) } mask =3D MSTATUS_SIE | MSTATUS_SPIE | MSTATUS_MIE | MSTATUS_MPIE | MSTATUS_SPP | MSTATUS_FS | MSTATUS_MPRV | MSTATUS_SUM | - MSTATUS_MPP | MSTATUS_MXR; + MSTATUS_MPP | MSTATUS_MXR | MSTATUS_TVM | MSTATUS_TSR | + MSTATUS_TW; } =20 /* silenty discard mstatus.mpp writes for unsupported modes */ @@ -650,7 +651,11 @@ static int read_satp(CPURISCVState *env, int csrno, ta= rget_ulong *val) if (!riscv_feature(env, RISCV_FEATURE_MMU)) { *val =3D 0; } else if (env->priv_ver >=3D PRIV_VERSION_1_10_0) { - *val =3D env->satp; + if (env->priv =3D=3D PRV_S && get_field(env->mstatus, MSTATUS_TVM)= ) { + return -1; + } else { + *val =3D env->satp; + } } else { *val =3D env->sptbr; } @@ -671,8 +676,12 @@ static int write_satp(CPURISCVState *env, int csrno, t= arget_ulong val) validate_vm(env, get_field(val, SATP_MODE)) && ((val ^ env->satp) & (SATP_MODE | SATP_ASID | SATP_PPN))) { - tlb_flush(CPU(riscv_env_get_cpu(env))); - env->satp =3D val; + if (env->priv =3D=3D PRV_S && get_field(env->mstatus, MSTATUS_TVM)= ) { + return -1; + } else { + tlb_flush(CPU(riscv_env_get_cpu(env))); + env->satp =3D val; + } } return 0; } diff --git a/target/riscv/op_helper.c b/target/riscv/op_helper.c index 81bd1a7..77c79ba 100644 --- a/target/riscv/op_helper.c +++ b/target/riscv/op_helper.c @@ -82,6 +82,11 @@ target_ulong helper_sret(CPURISCVState *env, target_ulon= g cpu_pc_deb) do_raise_exception_err(env, RISCV_EXCP_INST_ADDR_MIS, GETPC()); } =20 + if (env->priv_ver >=3D PRIV_VERSION_1_10_0 && + get_field(env->mstatus, MSTATUS_TSR)) { + do_raise_exception_err(env, RISCV_EXCP_ILLEGAL_INST, GETPC()); + } + target_ulong mstatus =3D env->mstatus; target_ulong prev_priv =3D get_field(mstatus, MSTATUS_SPP); mstatus =3D set_field(mstatus, @@ -125,16 +130,28 @@ void helper_wfi(CPURISCVState *env) { CPUState *cs =3D CPU(riscv_env_get_cpu(env)); =20 - cs->halted =3D 1; - cs->exception_index =3D EXCP_HLT; - cpu_loop_exit(cs); + if (env->priv =3D=3D PRV_S && + env->priv_ver >=3D PRIV_VERSION_1_10_0 && + get_field(env->mstatus, MSTATUS_TW)) { + do_raise_exception_err(env, RISCV_EXCP_ILLEGAL_INST, GETPC()); + } else { + cs->halted =3D 1; + cs->exception_index =3D EXCP_HLT; + cpu_loop_exit(cs); + } } =20 void helper_tlb_flush(CPURISCVState *env) { RISCVCPU *cpu =3D riscv_env_get_cpu(env); CPUState *cs =3D CPU(cpu); - tlb_flush(cs); + if (env->priv =3D=3D PRV_S && + env->priv_ver >=3D PRIV_VERSION_1_10_0 && + get_field(env->mstatus, MSTATUS_TVM)) { + do_raise_exception_err(env, RISCV_EXCP_ILLEGAL_INST, GETPC()); + } else { + tlb_flush(cs); + } } =20 #endif /* !CONFIG_USER_ONLY */ --=20 2.7.0