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Sat, 8 Aug 2020 05:20:40 +0000 X-IncomingTopHeaderMarker: OriginalChecksum:568699852E44F04F584B013C2FFB98883BACD92C0605364B0642170FD2ADD4EF; UpperCasedChecksum:AC604F6E81E1EB83138CE6A0058E271AB125996621484982695E351AF4E17325; SizeAsReceived:7706; Count:49 Received: from SG2PR02MB2634.apcprd02.prod.outlook.com ([fe80::8f0:37c7:286c:1725]) by SG2PR02MB2634.apcprd02.prod.outlook.com ([fe80::8f0:37c7:286c:1725%5]) with mapi id 15.20.3261.022; Sat, 8 Aug 2020 05:20:40 +0000 From: Hou Weiying To: qemu-riscv@nongnu.org, qemu-devel@nongnu.org Subject: [PATCH 2/4] Implementation of enhanced PMP(ePMP) support Date: Sat, 8 Aug 2020 13:20:29 +0800 Message-ID: X-Mailer: git-send-email 2.20.1 In-Reply-To: <20200808052031.19523-1-weiying_hou@outlook.com> References: <20200808052031.19523-1-weiying_hou@outlook.com> X-ClientProxiedBy: HKAPR03CA0012.apcprd03.prod.outlook.com (2603:1096:203:c8::17) To SG2PR02MB2634.apcprd02.prod.outlook.com (2603:1096:4:51::19) X-Microsoft-Original-Message-ID: <20200808052031.19523-3-weiying_hou@outlook.com> MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from localhost.localdomain (223.89.141.129) by HKAPR03CA0012.apcprd03.prod.outlook.com (2603:1096:203:c8::17) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.3283.7 via Frontend Transport; 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envelope-from=weiying_hou@outlook.com; helo=APC01-SG2-obe.outbound.protection.outlook.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/08/08 01:20:42 X-ACL-Warn: Detected OS = Windows NT kernel [generic] [fuzzy] X-Spam_score_int: -30 X-Spam_score: -3.1 X-Spam_bar: --- X-Spam_report: (-3.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, MSGID_FROM_MTA_HEADER=0.001, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H2=-1, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-Mailman-Approved-At: Sat, 08 Aug 2020 08:59:47 -0400 X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: sagark@eecs.berkeley.edu, kbastian@mail.uni-paderborn.de, Hongzheng-Li , Alistair.Francis@wdc.com, Myriad-Dreamin , palmer@dabbelt.com Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" The ePMP can be found in: https://docs.google.com/document/d/1Mh_aiHYxemL0umN3GTTw8vsbmzHZ_nxZXgjgOUzbvc8/edit#heading=h.9wsr1lnxtwe2 Signed-off-by: Hongzheng-Li Signed-off-by: Hou Weiying Signed-off-by: Myriad-Dreamin --- target/riscv/pmp.c | 134 ++++++++++++++++++++++++++++++++++---- target/riscv/pmp.h | 12 ++++ target/riscv/trace-events | 4 ++ 3 files changed, 138 insertions(+), 12 deletions(-) diff --git a/target/riscv/pmp.c b/target/riscv/pmp.c index 0e6b640fbd..8df389cecd 100644 --- a/target/riscv/pmp.c +++ b/target/riscv/pmp.c @@ -34,6 +34,26 @@ static void pmp_write_cfg(CPURISCVState *env, uint32_t addr_index, static uint8_t pmp_read_cfg(CPURISCVState *env, uint32_t addr_index); static void pmp_update_rule(CPURISCVState *env, uint32_t pmp_index); +static char mode_to_char(int mode) +{ + char ret = 0; + switch (mode) { + case PRV_U: + ret = 'u'; + break; + case PRV_S: + ret = 's'; + break; + case PRV_H: + ret = 'h'; + break; + case PRV_M: + ret = 'm'; + break; + } + return ret; +} + /* * Accessor method to extract address matching type 'a field' from cfg reg */ @@ -99,7 +119,28 @@ static inline uint8_t pmp_read_cfg(CPURISCVState *env, uint32_t pmp_index) static void pmp_write_cfg(CPURISCVState *env, uint32_t pmp_index, uint8_t val) { if (pmp_index < MAX_RISCV_PMPS) { - if (!pmp_is_locked(env, pmp_index)) { + /* + * mseccfg.RLB is set + */ + if (MSECCFG_RLB_ISSET(env) || + /* + * mseccfg.MML is set + */ + (MSECCFG_MML_ISSET(env) && + /* + * m model and not adding X bit + */ + (((val & PMP_LOCK) != 0 && (val & PMP_EXEC) != PMP_EXEC) || + /* + * shared region and not adding X bit + */ + ((val & PMP_LOCK) != PMP_LOCK && + (val & 0x7) != (PMP_WRITE | PMP_EXEC)))) || + /* + * mseccfg.MML is not set + */ + (!MSECCFG_MML_ISSET(env) && !pmp_is_locked(env, pmp_index)) + ){ env->pmp_state.pmp[pmp_index].cfg_reg = val; pmp_update_rule(env, pmp_index); } else { @@ -230,6 +271,18 @@ bool pmp_hart_has_privs(CPURISCVState *env, target_ulong addr, /* Short cut if no rules */ if (0 == pmp_get_num_rules(env)) { + if (MSECCFG_MMWP_ISSET(env)) { + qemu_log_mask(LOG_GUEST_ERROR, + "pmp violation - %c mode access denied\n", + mode_to_char(mode)); + return false; + } + if (MSECCFG_MML_ISSET(env) && (mode != PRV_M || (privs & PMP_EXEC))) { + qemu_log_mask(LOG_GUEST_ERROR, + "pmp violation - %c mode access denied\n", + mode_to_char(mode)); + return false; + } return true; } @@ -261,16 +314,65 @@ bool pmp_hart_has_privs(CPURISCVState *env, target_ulong addr, const uint8_t a_field = pmp_get_a_field(env->pmp_state.pmp[i].cfg_reg); - /* - * If the PMP entry is not off and the address is in range, do the priv - * check - */ if (((s + e) == 2) && (PMP_AMATCH_OFF != a_field)) { - allowed_privs = PMP_READ | PMP_WRITE | PMP_EXEC; - if ((mode != PRV_M) || pmp_is_locked(env, i)) { - allowed_privs &= env->pmp_state.pmp[i].cfg_reg; + /* + * If the PMP entry is not off and the address is in range, + * do the priv check + */ + if (!MSECCFG_MML_ISSET(env)) { + /* + * If mseccfg.MML Bit is not set, do pmp priv check + */ + allowed_privs = PMP_READ | PMP_WRITE | PMP_EXEC; + if ((mode != PRV_M) || pmp_is_locked(env, i)) { + allowed_privs &= env->pmp_state.pmp[i].cfg_reg; + } + } else { + /* + * If mseccfg.MML Bit set, do the enhanced pmp priv check + */ + if (env->pmp_state.pmp[i].cfg_reg & PMP_LOCK) { + /* + * Shared Region + */ + if ((env->pmp_state.pmp[i].cfg_reg & + (PMP_READ | PMP_WRITE)) == PMP_WRITE) { + allowed_privs = PMP_EXEC | ((mode == PRV_M && + (env->pmp_state.pmp[i].cfg_reg & PMP_EXEC)) ? + PMP_READ : 0); + } else { + allowed_privs = env->pmp_state.pmp[i].cfg_reg & + (PMP_READ | PMP_WRITE | PMP_EXEC); + + if (mode != PRV_M && allowed_privs) { + qemu_log_mask(LOG_GUEST_ERROR, + "pmp violation - %c mode access denied\n", + mode_to_char(mode)); + ret = 0; + break; + } + } + } else { + /* + * Shared Region + */ + if ((env->pmp_state.pmp[i].cfg_reg & + (PMP_READ | PMP_WRITE)) == PMP_WRITE) { + allowed_privs = PMP_READ | ((mode == PRV_M || + (env->pmp_state.pmp[i].cfg_reg & PMP_EXEC)) ? + PMP_WRITE : 0); + } else { + allowed_privs = env->pmp_state.pmp[i].cfg_reg & + (PMP_READ | PMP_WRITE | PMP_EXEC); + if (mode == PRV_M && allowed_privs) { + qemu_log_mask(LOG_GUEST_ERROR, + "pmp violation - m mode access denied\n"); + ret = 0; + break; + } + } + } } - if ((privs & allowed_privs) == privs) { ret = 1; break; @@ -284,15 +386,23 @@ bool pmp_hart_has_privs(CPURISCVState *env, target_ulong addr, /* No rule matched */ if (ret == -1) { if (mode == PRV_M) { - ret = 1; /* Privileged spec v1.10 states if no PMP entry matches an - * M-Mode access, the access succeeds */ + ret = !MSECCFG_MMWP_ISSET(env); /* PMP Enhancements */ + if (MSECCFG_MML_ISSET(env) && (privs & PMP_EXEC)) { + ret = 0; + } } else { ret = 0; /* Other modes are not allowed to succeed if they don't * match a rule, but there are rules. We've checked for * no rule earlier in this function. */ } } - + if (ret) { + trace_pmp_hart_has_privs_pass_match( + env->mhartid, addr, size, privs, mode); + } else { + trace_pmp_hart_has_privs_violation( + env->mhartid, addr, size, privs, mode); + } return ret == 1 ? true : false; } diff --git a/target/riscv/pmp.h b/target/riscv/pmp.h index 8e19793132..7db2069204 100644 --- a/target/riscv/pmp.h +++ b/target/riscv/pmp.h @@ -36,6 +36,12 @@ typedef enum { PMP_AMATCH_NAPOT /* Naturally aligned power-of-two region */ } pmp_am_t; +typedef enum { + MSECCFG_MML = 1 << 0, + MSECCFG_MMWP = 1 << 1, + MSECCFG_RLB = 1 << 2 +} mseccfg_field_t; + typedef struct { target_ulong addr_reg; uint8_t cfg_reg; @@ -58,7 +64,13 @@ target_ulong pmpcfg_csr_read(CPURISCVState *env, uint32_t reg_index); void pmpaddr_csr_write(CPURISCVState *env, uint32_t addr_index, target_ulong val); target_ulong pmpaddr_csr_read(CPURISCVState *env, uint32_t addr_index); +void mseccfg_csr_write(CPURISCVState *env, target_ulong val); +target_ulong mseccfg_csr_read(CPURISCVState *env); bool pmp_hart_has_privs(CPURISCVState *env, target_ulong addr, target_ulong size, pmp_priv_t priv, target_ulong mode); +#define MSECCFG_MML_ISSET(env) get_field(env->mseccfg, MSECCFG_MML) +#define MSECCFG_MMWP_ISSET(env) get_field(env->mseccfg, MSECCFG_MMWP) +#define MSECCFG_RLB_ISSET(env) get_field(env->mseccfg, MSECCFG_RLB) + #endif diff --git a/target/riscv/trace-events b/target/riscv/trace-events index 4b6c652ae9..4f877f90f7 100644 --- a/target/riscv/trace-events +++ b/target/riscv/trace-events @@ -6,3 +6,7 @@ pmpcfg_csr_read(uint64_t mhartid, uint32_t reg_index, uint64_t val) "hart %" PRI pmpcfg_csr_write(uint64_t mhartid, uint32_t reg_index, uint64_t val) "hart %" PRIu64 ": write reg%" PRIu32", val: 0x%" PRIx64 pmpaddr_csr_read(uint64_t mhartid, uint32_t addr_index, uint64_t val) "hart %" PRIu64 ": read addr%" PRIu32", val: 0x%" PRIx64 pmpaddr_csr_write(uint64_t mhartid, uint32_t addr_index, uint64_t val) "hart %" PRIu64 ": write addr%" PRIu32", val: 0x%" PRIx64 +mseccfg_csr_read(uint64_t mhartid, uint64_t val) "hart %" PRIu64 ": read mseccfg, val: 0x%" PRIx64 +mseccfg_csr_write(uint64_t mhartid, uint64_t val) "hart %" PRIu64 ": write mseccfg, val: 0x%" PRIx64 +pmp_hart_has_privs_pass_match(uint64_t mhartid, uint64_t addr, uint64_t size, uint64_t privs, uint64_t mode) "hart %"PRId64 "pass PMP 0 match addr:%"PRIu64" size:%"PRIu64 "privs: %"PRIu64 "mode: %"PRIu64 +pmp_hart_has_privs_violation(uint64_t mhartid, uint64_t addr, uint64_t size, uint64_t privs, uint64_t mode) "hart %"PRId64 "pass PMP 0 match addr:%"PRIu64" size:%"PRIu64 "privs: %"PRIu64 "mode: %"PRIu64 From patchwork Sat Aug 8 05:20:30 2020 Content-Type: text/plain; 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envelope-from=weiying_hou@outlook.com; helo=APC01-SG2-obe.outbound.protection.outlook.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/08/08 01:20:42 X-ACL-Warn: Detected OS = Windows NT kernel [generic] [fuzzy] X-Spam_score_int: -30 X-Spam_score: -3.1 X-Spam_bar: --- X-Spam_report: (-3.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, MSGID_FROM_MTA_HEADER=0.001, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H2=-1, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-Mailman-Approved-At: Sat, 08 Aug 2020 08:59:47 -0400 X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: sagark@eecs.berkeley.edu, kbastian@mail.uni-paderborn.de, Hongzheng-Li , Alistair.Francis@wdc.com, Myriad-Dreamin , palmer@dabbelt.com Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" Signed-off-by: Hongzheng-Li Signed-off-by: Hou Weiying Signed-off-by: Myriad-Dreamin --- target/riscv/csr.c | 18 ++++++++++++++++++ target/riscv/pmp.c | 40 ++++++++++++++++++++++++++++++++++++++++ 2 files changed, 58 insertions(+) diff --git a/target/riscv/csr.c b/target/riscv/csr.c index 11d184cd16..e2395e3a51 100644 --- a/target/riscv/csr.c +++ b/target/riscv/csr.c @@ -112,6 +112,11 @@ static int hmode(CPURISCVState *env, int csrno) return -1; } +static int epmp(CPURISCVState *env, int csrno) +{ + return -!(env->priv == PRV_M && riscv_feature(env, RISCV_FEATURE_EPMP)); +} + static int pmp(CPURISCVState *env, int csrno) { return -!riscv_feature(env, RISCV_FEATURE_PMP); @@ -1160,6 +1165,18 @@ static int write_pmpaddr(CPURISCVState *env, int csrno, target_ulong val) return 0; } +static int read_mseccfg(CPURISCVState *env, int csrno, target_ulong *val) +{ + *val = mseccfg_csr_read(env); + return 0; +} + +static int write_mseccfg(CPURISCVState *env, int csrno, target_ulong val) +{ + mseccfg_csr_write(env, val); + return 0; +} + #endif /* @@ -1368,6 +1385,7 @@ static riscv_csr_operations csr_ops[CSR_TABLE_SIZE] = { [CSR_MTINST] = { hmode, read_mtinst, write_mtinst }, /* Physical Memory Protection */ + [CSR_MSECCFG] = { epmp, read_mseccfg, write_mseccfg }, [CSR_PMPCFG0 ... CSR_PMPADDR9] = { pmp, read_pmpcfg, write_pmpcfg }, [CSR_PMPADDR0 ... CSR_PMPADDR15] = { pmp, read_pmpaddr, write_pmpaddr }, diff --git a/target/riscv/pmp.c b/target/riscv/pmp.c index 8df389cecd..0eabaf690c 100644 --- a/target/riscv/pmp.c +++ b/target/riscv/pmp.c @@ -490,3 +490,43 @@ target_ulong pmpaddr_csr_read(CPURISCVState *env, uint32_t addr_index) return val; } + + +/* + * Handle a write to a mseccfg CSR + */ +void mseccfg_csr_write(CPURISCVState *env, target_ulong val) +{ + int i; + + if (!MSECCFG_RLB_ISSET(env)) { + for (i = 0; i < MAX_RISCV_PMPS; i++) { + if (pmp_is_locked(env, i)) { + /* + * Now that mseccfg.rlb is zero + * the value of mseccfg.rlb should be locked. + */ + val &= ~MSECCFG_RLB; + break; + } + } + } + + /* + * sticky bit + */ + val |= (env->mseccfg & (MSECCFG_MMWP | MSECCFG_MML)); + + env->mseccfg = val; + trace_mseccfg_csr_write(env->mhartid, val); +} + + +/* + * Handle a read from a mseccfg CSR + */ +target_ulong mseccfg_csr_read(CPURISCVState *env) +{ + trace_mseccfg_csr_read(env->mhartid, env->mseccfg); + return env->mseccfg; 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This is disabled by default and can be enabled with 'x-epmp=true'. Signed-off-by: Hongzheng-Li Signed-off-by: Hou Weiying Signed-off-by: Myriad-Dreamin --- target/riscv/cpu.c | 9 +++++++++ target/riscv/cpu.h | 3 +++ 2 files changed, 12 insertions(+) diff --git a/target/riscv/cpu.c b/target/riscv/cpu.c index 059d71f2c7..79fa9d3c2f 100644 --- a/target/riscv/cpu.c +++ b/target/riscv/cpu.c @@ -407,6 +407,14 @@ static void riscv_cpu_realize(DeviceState *dev, Error **errp) if (cpu->cfg.pmp) { set_feature(env, RISCV_FEATURE_PMP); + + /* + * Enhanced PMP should only be available + * on harts with PMP support + */ + if (cpu->cfg.epmp) { + set_feature(env, RISCV_FEATURE_EPMP); + } } /* If misa isn't set (rv32 and rv64 machines) set it here */ @@ -509,6 +517,7 @@ static Property riscv_cpu_properties[] = { DEFINE_PROP_STRING("priv_spec", RISCVCPU, cfg.priv_spec), DEFINE_PROP_BOOL("mmu", RISCVCPU, cfg.mmu, true), DEFINE_PROP_BOOL("pmp", RISCVCPU, cfg.pmp, true), + DEFINE_PROP_BOOL("x-epmp", RISCVCPU, cfg.epmp, false), DEFINE_PROP_END_OF_LIST(), }; diff --git a/target/riscv/cpu.h b/target/riscv/cpu.h index d0e7f5b9c5..afdc9fa2bf 100644 --- a/target/riscv/cpu.h +++ b/target/riscv/cpu.h @@ -77,6 +77,7 @@ enum { RISCV_FEATURE_MMU, RISCV_FEATURE_PMP, + RISCV_FEATURE_EPMP, RISCV_FEATURE_MISA }; @@ -202,6 +203,7 @@ struct CPURISCVState { /* physical memory protection */ pmp_table_t pmp_state; + target_ulong mseccfg; /* machine specific rdtime callback */ uint64_t (*rdtime_fn)(void); @@ -272,6 +274,7 @@ typedef struct RISCVCPU { char *user_spec; bool mmu; bool pmp; + bool epmp; } cfg; } RISCVCPU;