* [RFC PATCH v1 1/4] target/riscv: Add smstateen support
2022-03-22 13:42 [RFC PATCH v1 0/4] RISC-V Smstateen support Mayuresh Chitale
@ 2022-03-22 13:42 ` Mayuresh Chitale
2022-03-22 13:42 ` [RFC PATCH v1 2/4] target/riscv: smstateen check for h/senvcfg Mayuresh Chitale
` (2 subsequent siblings)
3 siblings, 0 replies; 5+ messages in thread
From: Mayuresh Chitale @ 2022-03-22 13:42 UTC (permalink / raw)
To: qemu-riscv, qemu-devel; +Cc: Mayuresh Chitale, alistair.francis
Smstateen extension specifies a mechanism to close
the potential covert channels that could cause security issues.
This patch adds the CSRs defined in the specification and
the corresponding predicates and read/write functions.
Signed-off-by: Mayuresh Chitale <mchitale@ventanamicro.com>
---
target/riscv/cpu.c | 2 +
target/riscv/cpu.h | 4 +
target/riscv/cpu_bits.h | 36 +++++++
target/riscv/csr.c | 210 ++++++++++++++++++++++++++++++++++++++++
target/riscv/machine.c | 22 ++++-
5 files changed, 273 insertions(+), 1 deletion(-)
diff --git a/target/riscv/cpu.c b/target/riscv/cpu.c
index 8e338daf72..832602d91f 100644
--- a/target/riscv/cpu.c
+++ b/target/riscv/cpu.c
@@ -807,6 +807,7 @@ static Property riscv_cpu_properties[] = {
DEFINE_PROP_BOOL("mmu", RISCVCPU, cfg.mmu, true),
DEFINE_PROP_BOOL("pmp", RISCVCPU, cfg.pmp, true),
DEFINE_PROP_BOOL("sstc", RISCVCPU, cfg.ext_sstc, true),
+ DEFINE_PROP_BOOL("smstateen", RISCVCPU, cfg.ext_smstateen, true),
DEFINE_PROP_STRING("priv_spec", RISCVCPU, cfg.priv_spec),
DEFINE_PROP_STRING("vext_spec", RISCVCPU, cfg.vext_spec),
@@ -970,6 +971,7 @@ static void riscv_isa_string_ext(RISCVCPU *cpu, char **isa_str, int max_str_len)
ISA_EDATA_ENTRY(svinval, ext_svinval),
ISA_EDATA_ENTRY(svnapot, ext_svnapot),
ISA_EDATA_ENTRY(svpbmt, ext_svpbmt),
+ ISA_EDATA_ENTRY(smstateen, ext_smstateen),
};
for (i = 0; i < ARRAY_SIZE(isa_edata_arr); i++) {
diff --git a/target/riscv/cpu.h b/target/riscv/cpu.h
index ea23666e8e..8e61edca6f 100644
--- a/target/riscv/cpu.h
+++ b/target/riscv/cpu.h
@@ -338,6 +338,9 @@ struct CPURISCVState {
/* CSRs for execution enviornment configuration */
uint64_t menvcfg;
+ uint64_t mstateen[SMSTATEEN_MAX_COUNT];
+ uint64_t hstateen[SMSTATEEN_MAX_COUNT];
+ uint64_t sstateen[SMSTATEEN_MAX_COUNT];
target_ulong senvcfg;
uint64_t henvcfg;
#endif
@@ -416,6 +419,7 @@ struct RISCVCPUConfig {
bool ext_zve32f;
bool ext_zve64f;
bool ext_sscofpmf;
+ bool ext_smstateen;
/* Vendor-specific custom extensions */
bool ext_XVentanaCondOps;
diff --git a/target/riscv/cpu_bits.h b/target/riscv/cpu_bits.h
index 7454f4087f..66edb26686 100644
--- a/target/riscv/cpu_bits.h
+++ b/target/riscv/cpu_bits.h
@@ -205,6 +205,12 @@
/* Supervisor Configuration CSRs */
#define CSR_SENVCFG 0x10A
+/* Supervisor state CSRs */
+#define CSR_SSTATEEN0 0x10C
+#define CSR_SSTATEEN1 0x10D
+#define CSR_SSTATEEN2 0x10E
+#define CSR_SSTATEEN3 0x10F
+
/* Supervisor Trap Handling */
#define CSR_SSCRATCH 0x140
#define CSR_SEPC 0x141
@@ -258,6 +264,16 @@
#define CSR_HENVCFG 0x60A
#define CSR_HENVCFGH 0x61A
+/* Hypervisor state CSRs */
+#define CSR_HSTATEEN0 0x60C
+#define CSR_HSTATEEN0H 0x61C
+#define CSR_HSTATEEN1 0x60D
+#define CSR_HSTATEEN1H 0x61D
+#define CSR_HSTATEEN2 0x60E
+#define CSR_HSTATEEN2H 0x61E
+#define CSR_HSTATEEN3 0x60F
+#define CSR_HSTATEEN3H 0x61F
+
/* Virtual CSRs */
#define CSR_VSSTATUS 0x200
#define CSR_VSIE 0x204
@@ -309,6 +325,26 @@
#define CSR_MENVCFG 0x30A
#define CSR_MENVCFGH 0x31A
+/* Machine state CSRs */
+#define CSR_MSTATEEN0 0x30C
+#define CSR_MSTATEEN0H 0x31C
+#define CSR_MSTATEEN1 0x30D
+#define CSR_MSTATEEN1H 0x31D
+#define CSR_MSTATEEN2 0x30E
+#define CSR_MSTATEEN2H 0x31E
+#define CSR_MSTATEEN3 0x30F
+#define CSR_MSTATEEN3H 0x31F
+
+/* Common defines for all smstateen */
+#define SMSTATEEN_MAX_COUNT 4
+#define SMSTATEEN0_CS 0
+#define SMSTATEEN0_FCSR 0
+#define SMSTATEEN0_IMSIC 58
+#define SMSTATEEN0_AIA 59
+#define SMSTATEEN0_SVSLCT 60
+#define SMSTATEEN0_HSENVCFG 62
+#define SMSTATEEN_STATEN 63
+
/* Enhanced Physical Memory Protection (ePMP) */
#define CSR_MSECCFG 0x747
#define CSR_MSECCFGH 0x757
diff --git a/target/riscv/csr.c b/target/riscv/csr.c
index d3d16d71de..215c8ecef1 100644
--- a/target/riscv/csr.c
+++ b/target/riscv/csr.c
@@ -265,6 +265,42 @@ static RISCVException hmode32(CPURISCVState *env, int csrno)
}
+static RISCVException mstateen(CPURISCVState *env, int csrno)
+{
+ CPUState *cs = env_cpu(env);
+ RISCVCPU *cpu = RISCV_CPU(cs);
+
+ if (!cpu->cfg.ext_smstateen) {
+ return RISCV_EXCP_ILLEGAL_INST;
+ }
+
+ return any(env, csrno);
+}
+
+static RISCVException hstateen(CPURISCVState *env, int csrno)
+{
+ CPUState *cs = env_cpu(env);
+ RISCVCPU *cpu = RISCV_CPU(cs);
+
+ if (!cpu->cfg.ext_smstateen) {
+ return RISCV_EXCP_ILLEGAL_INST;
+ }
+
+ return hmode(env, csrno);
+}
+
+static RISCVException sstateen(CPURISCVState *env, int csrno)
+{
+ CPUState *cs = env_cpu(env);
+ RISCVCPU *cpu = RISCV_CPU(cs);
+
+ if (!cpu->cfg.ext_smstateen) {
+ return RISCV_EXCP_ILLEGAL_INST;
+ }
+
+ return smode(env, csrno);
+}
+
/* Checks if PointerMasking registers could be accessed */
static RISCVException pointer_masking(CPURISCVState *env, int csrno)
{
@@ -1882,6 +1918,129 @@ static RISCVException write_henvcfgh(CPURISCVState *env, int csrno,
return RISCV_EXCP_NONE;
}
+static inline void write_smstateen(CPURISCVState *env, uint64_t *reg,
+ uint64_t wr_mask, uint64_t new_val)
+{
+ *reg = (*reg & ~wr_mask) | (new_val & wr_mask);
+}
+
+static RISCVException read_mstateen(CPURISCVState *env, int csrno,
+ target_ulong *val)
+{
+ *val = env->mstateen[csrno - CSR_MSTATEEN0];
+
+ return RISCV_EXCP_NONE;
+}
+
+static RISCVException write_mstateen(CPURISCVState *env, int csrno,
+ target_ulong new_val)
+{
+ uint64_t *reg;
+ uint64_t wr_mask = 1UL << SMSTATEEN_STATEN;
+
+ reg = &env->mstateen[csrno - CSR_MSTATEEN0];
+ write_smstateen(env, reg, wr_mask, new_val);
+
+ return RISCV_EXCP_NONE;
+}
+
+static RISCVException read_mstateenh(CPURISCVState *env, int csrno,
+ target_ulong *val)
+{
+ *val = env->mstateen[csrno - CSR_MSTATEEN0H - 0x10] >> 32;
+
+ return RISCV_EXCP_NONE;
+}
+
+static RISCVException write_mstateenh(CPURISCVState *env, int csrno,
+ target_ulong new_val)
+{
+ uint64_t *reg;
+ uint64_t val;
+ uint64_t wr_mask = 1UL << SMSTATEEN_STATEN;
+
+ reg = &env->mstateen[csrno - CSR_MSTATEEN0H - 0x10];
+ val = (uint64_t)new_val << 32;
+ val |= *reg & 0xFFFFFFFF;
+ write_smstateen(env, reg, wr_mask, val);
+
+ return RISCV_EXCP_NONE;
+}
+
+static RISCVException read_hstateen(CPURISCVState *env, int csrno,
+ target_ulong *val)
+{
+ *val = env->hstateen[csrno - CSR_HSTATEEN0];
+
+ return RISCV_EXCP_NONE;
+}
+
+static RISCVException write_hstateen(CPURISCVState *env, int csrno,
+ target_ulong new_val)
+{
+ uint64_t *reg;
+ uint64_t wr_mask = 1UL << SMSTATEEN_STATEN;
+ int index = csrno - CSR_HSTATEEN0;
+
+ reg = &env->hstateen[index];
+ wr_mask &= env->mstateen[index];
+ write_smstateen(env, reg, wr_mask, new_val);
+
+ return RISCV_EXCP_NONE;
+}
+
+static RISCVException read_hstateenh(CPURISCVState *env, int csrno,
+ target_ulong *val)
+{
+ *val = env->hstateen[csrno - CSR_HSTATEEN0H - 0x10] >> 32;
+
+ return RISCV_EXCP_NONE;
+}
+
+static RISCVException write_hstateenh(CPURISCVState *env, int csrno,
+ target_ulong new_val)
+{
+ uint64_t *reg;
+ uint64_t val;
+ uint64_t wr_mask = 1UL << SMSTATEEN_STATEN;
+ int index = csrno - CSR_HSTATEEN0H - 0x10;
+
+ reg = &env->hstateen[index];
+ val = (uint64_t)new_val << 32;
+ val |= *reg & 0xFFFFFFFF;
+ wr_mask &= env->mstateen[index];
+
+ write_smstateen(env, reg, wr_mask, val);
+ return RISCV_EXCP_NONE;
+}
+
+static RISCVException read_sstateen(CPURISCVState *env, int csrno,
+ target_ulong *val)
+{
+ *val = env->sstateen[csrno - CSR_SSTATEEN0];
+
+ return RISCV_EXCP_NONE;
+}
+
+static RISCVException write_sstateen(CPURISCVState *env, int csrno,
+ target_ulong new_val)
+{
+ uint64_t *reg;
+ uint64_t wr_mask = 0;
+ int index = csrno - CSR_SSTATEEN0;
+ bool virt = riscv_cpu_virt_enabled(env);
+
+ reg = &env->sstateen[index];
+ if (virt) {
+ wr_mask &= env->mstateen[index];
+ } else {
+ wr_mask &= env->hstateen[index];
+ }
+ write_smstateen(env, reg, wr_mask, new_val);
+
+ return RISCV_EXCP_NONE;
+}
+
static RISCVException rmw_mip64(CPURISCVState *env, int csrno,
uint64_t *ret_val,
uint64_t new_val, uint64_t wr_mask)
@@ -3664,6 +3823,57 @@ riscv_csr_operations csr_ops[CSR_TABLE_SIZE] = {
[CSR_HENVCFGH] = { "henvcfgh", hmode32, read_henvcfgh, write_henvcfgh,
.min_priv_ver = PRIV_VERSION_1_12_0 },
+ /* Smstateen extension CSRs */
+ [CSR_MSTATEEN0] = { "mstateen0", mstateen, read_mstateen, write_mstateen,
+ .min_priv_ver = PRIV_VERSION_1_12_0 },
+ [CSR_MSTATEEN0H] = { "mstateen0h", mstateen, read_mstateenh,
+ write_mstateenh,
+ .min_priv_ver = PRIV_VERSION_1_12_0 },
+ [CSR_MSTATEEN1] = { "mstateen1", mstateen, read_mstateen, write_mstateen,
+ .min_priv_ver = PRIV_VERSION_1_12_0 },
+ [CSR_MSTATEEN1H] = { "mstateen1h", mstateen, read_mstateenh,
+ write_mstateenh,
+ .min_priv_ver = PRIV_VERSION_1_12_0 },
+ [CSR_MSTATEEN2] = { "mstateen2", mstateen, read_mstateen, write_mstateen,
+ .min_priv_ver = PRIV_VERSION_1_12_0 },
+ [CSR_MSTATEEN2H] = { "mstateen2h", mstateen, read_mstateenh,
+ write_mstateenh,
+ .min_priv_ver = PRIV_VERSION_1_12_0 },
+ [CSR_MSTATEEN3] = { "mstateen3", mstateen, read_mstateen, write_mstateen,
+ .min_priv_ver = PRIV_VERSION_1_12_0 },
+ [CSR_MSTATEEN3H] = { "mstateen3h", mstateen, read_mstateenh,
+ write_mstateenh,
+ .min_priv_ver = PRIV_VERSION_1_12_0 },
+
+ [CSR_HSTATEEN0] = { "hstateen0", hstateen, read_hstateen, write_hstateen,
+ .min_priv_ver = PRIV_VERSION_1_12_0 },
+ [CSR_HSTATEEN0H] = { "hstateen0h", hstateen, read_hstateenh,
+ write_hstateenh,
+ .min_priv_ver = PRIV_VERSION_1_12_0 },
+ [CSR_HSTATEEN1] = { "hstateen1", hstateen, read_hstateen, write_hstateen,
+ .min_priv_ver = PRIV_VERSION_1_12_0 },
+ [CSR_HSTATEEN1H] = { "hstateen1h", hstateen, read_hstateenh,
+ write_hstateenh,
+ .min_priv_ver = PRIV_VERSION_1_12_0 },
+ [CSR_HSTATEEN2] = { "hstateen2", hstateen, read_hstateen, write_hstateen,
+ .min_priv_ver = PRIV_VERSION_1_12_0 },
+ [CSR_HSTATEEN2H] = { "hstateen2h", hstateen, read_hstateenh,
+ write_hstateenh,
+ .min_priv_ver = PRIV_VERSION_1_12_0 },
+ [CSR_HSTATEEN3] = { "hstateen3", hstateen, read_hstateen, write_hstateen,
+ .min_priv_ver = PRIV_VERSION_1_12_0 },
+ [CSR_HSTATEEN3H] = { "hstateen3h", hstateen, read_hstateenh,
+ write_hstateenh,
+ .min_priv_ver = PRIV_VERSION_1_12_0 },
+
+ [CSR_SSTATEEN0] = { "sstateen0", sstateen, read_sstateen, write_sstateen,
+ .min_priv_ver = PRIV_VERSION_1_12_0 },
+ [CSR_SSTATEEN1] = { "sstateen1", sstateen, read_sstateen, write_sstateen,
+ .min_priv_ver = PRIV_VERSION_1_12_0 },
+ [CSR_SSTATEEN2] = { "sstateen2", sstateen, read_sstateen, write_sstateen,
+ .min_priv_ver = PRIV_VERSION_1_12_0 },
+ [CSR_SSTATEEN3] = { "sstateen3", sstateen, read_sstateen, write_sstateen,
+ .min_priv_ver = PRIV_VERSION_1_12_0 },
/* Supervisor Trap Setup */
[CSR_SSTATUS] = { "sstatus", smode, read_sstatus, write_sstatus, NULL,
read_sstatus_i128 },
diff --git a/target/riscv/machine.c b/target/riscv/machine.c
index aa968dc29c..e376f82ca0 100644
--- a/target/riscv/machine.c
+++ b/target/riscv/machine.c
@@ -232,6 +232,26 @@ static int riscv_cpu_post_load(void *opaque, int version_id)
return 0;
}
+static bool smstateen_needed(void *opaque)
+{
+ RISCVCPU *cpu = opaque;
+
+ return cpu->cfg.ext_smstateen;
+}
+
+static const VMStateDescription vmstate_smstateen = {
+ .name = "cpu/smtateen",
+ .version_id = 1,
+ .minimum_version_id = 1,
+ .needed = smstateen_needed,
+ .fields = (VMStateField[]) {
+ VMSTATE_UINT64_ARRAY(env.mstateen, RISCVCPU, 4),
+ VMSTATE_UINT64_ARRAY(env.hstateen, RISCVCPU, 4),
+ VMSTATE_UINT64_ARRAY(env.sstateen, RISCVCPU, 4),
+ VMSTATE_END_OF_LIST()
+ }
+};
+
static bool envcfg_needed(void *opaque)
{
RISCVCPU *cpu = opaque;
@@ -331,7 +351,6 @@ const VMStateDescription vmstate_riscv_cpu = {
VMSTATE_UINT64(env.mtohost, RISCVCPU),
VMSTATE_UINT64(env.mtimecmp, RISCVCPU),
VMSTATE_UINT64(env.stimecmp, RISCVCPU),
-
VMSTATE_END_OF_LIST()
},
.subsections = (const VMStateDescription * []) {
@@ -342,6 +361,7 @@ const VMStateDescription vmstate_riscv_cpu = {
&vmstate_rv128,
&vmstate_kvmtimer,
&vmstate_envcfg,
+ &vmstate_smstateen,
NULL
}
};
--
2.17.1
^ permalink raw reply related [flat|nested] 5+ messages in thread* [RFC PATCH v1 2/4] target/riscv: smstateen check for h/senvcfg
2022-03-22 13:42 [RFC PATCH v1 0/4] RISC-V Smstateen support Mayuresh Chitale
2022-03-22 13:42 ` [RFC PATCH v1 1/4] target/riscv: Add smstateen support Mayuresh Chitale
@ 2022-03-22 13:42 ` Mayuresh Chitale
2022-03-22 13:42 ` [RFC PATCH v1 3/4] target/riscv: smstateen check for fcsr Mayuresh Chitale
2022-03-22 13:42 ` [RFC PATCH v1 4/4] target/riscv: smstateen check for AIA/IMSIC Mayuresh Chitale
3 siblings, 0 replies; 5+ messages in thread
From: Mayuresh Chitale @ 2022-03-22 13:42 UTC (permalink / raw)
To: qemu-riscv, qemu-devel; +Cc: Mayuresh Chitale, alistair.francis
Accesses to henvcfg, henvcfgh and senvcfg are allowed
only if corresponding bit in mstateen0/hstateen0 is
enabled. Otherwise an illegal instruction trap is
generated.
Signed-off-by: Mayuresh Chitale <mchitale@ventanamicro.com>
---
target/riscv/csr.c | 70 ++++++++++++++++++++++++++++++++++++++++++++--
1 file changed, 68 insertions(+), 2 deletions(-)
diff --git a/target/riscv/csr.c b/target/riscv/csr.c
index 215c8ecef1..46761a6fa8 100644
--- a/target/riscv/csr.c
+++ b/target/riscv/csr.c
@@ -39,6 +39,35 @@ void riscv_set_csr_ops(int csrno, riscv_csr_operations *ops)
}
/* Predicates */
+static RISCVException smstateen_acc_ok(CPURISCVState *env, int mode, int bit)
+{
+ CPUState *cs = env_cpu(env);
+ RISCVCPU *cpu = RISCV_CPU(cs);
+ bool virt = riscv_cpu_virt_enabled(env);
+
+ if (!cpu->cfg.ext_smstateen) {
+ return RISCV_EXCP_NONE;
+ }
+
+ if (!(env->mstateen[0] & 1UL << bit)) {
+ return RISCV_EXCP_ILLEGAL_INST;
+ }
+
+ if (virt) {
+ if (!(env->hstateen[0] & 1UL << bit)) {
+ return RISCV_EXCP_VIRT_INSTRUCTION_FAULT;
+ }
+ }
+
+ if (mode == PRV_U) {
+ if (!(env->sstateen[0] & 1UL << bit)) {
+ return RISCV_EXCP_ILLEGAL_INST;
+ }
+ }
+
+ return RISCV_EXCP_NONE;
+}
+
static RISCVException fs(CPURISCVState *env, int csrno)
{
#if !defined(CONFIG_USER_ONLY)
@@ -1865,6 +1894,13 @@ static RISCVException write_menvcfgh(CPURISCVState *env, int csrno,
static RISCVException read_senvcfg(CPURISCVState *env, int csrno,
target_ulong *val)
{
+ RISCVException ret;
+
+ ret = smstateen_acc_ok(env, PRV_S, SMSTATEEN0_HSENVCFG);
+ if (ret != RISCV_EXCP_NONE) {
+ return ret;
+ }
+
*val = env->senvcfg;
return RISCV_EXCP_NONE;
}
@@ -1873,15 +1909,27 @@ static RISCVException write_senvcfg(CPURISCVState *env, int csrno,
target_ulong val)
{
uint64_t mask = SENVCFG_FIOM | SENVCFG_CBIE | SENVCFG_CBCFE | SENVCFG_CBZE;
+ RISCVException ret;
- env->senvcfg = (env->senvcfg & ~mask) | (val & mask);
+ ret = smstateen_acc_ok(env, PRV_S, SMSTATEEN0_HSENVCFG);
+ if (ret != RISCV_EXCP_NONE) {
+ return ret;
+ }
+ env->senvcfg = (env->senvcfg & ~mask) | (val & mask);
return RISCV_EXCP_NONE;
}
static RISCVException read_henvcfg(CPURISCVState *env, int csrno,
target_ulong *val)
{
+ RISCVException ret;
+
+ ret = smstateen_acc_ok(env, PRV_S, SMSTATEEN0_HSENVCFG);
+ if (ret != RISCV_EXCP_NONE) {
+ return ret;
+ }
+
*val = env->henvcfg;
return RISCV_EXCP_NONE;
}
@@ -1890,6 +1938,12 @@ static RISCVException write_henvcfg(CPURISCVState *env, int csrno,
target_ulong val)
{
uint64_t mask = HENVCFG_FIOM | HENVCFG_CBIE | HENVCFG_CBCFE | HENVCFG_CBZE;
+ RISCVException ret;
+
+ ret = smstateen_acc_ok(env, PRV_S, SMSTATEEN0_HSENVCFG);
+ if (ret != RISCV_EXCP_NONE) {
+ return ret;
+ }
if (riscv_cpu_mxl(env) == MXL_RV64) {
mask |= HENVCFG_PBMTE | HENVCFG_STCE;
@@ -1903,6 +1957,13 @@ static RISCVException write_henvcfg(CPURISCVState *env, int csrno,
static RISCVException read_henvcfgh(CPURISCVState *env, int csrno,
target_ulong *val)
{
+ RISCVException ret;
+
+ ret = smstateen_acc_ok(env, PRV_S, SMSTATEEN0_HSENVCFG);
+ if (ret != RISCV_EXCP_NONE) {
+ return ret;
+ }
+
*val = env->henvcfg >> 32;
return RISCV_EXCP_NONE;
}
@@ -1912,9 +1973,14 @@ static RISCVException write_henvcfgh(CPURISCVState *env, int csrno,
{
uint64_t mask = HENVCFG_PBMTE | HENVCFG_STCE;
uint64_t valh = (uint64_t)val << 32;
+ RISCVException ret;
- env->henvcfg = (env->henvcfg & ~mask) | (valh & mask);
+ ret = smstateen_acc_ok(env, PRV_S, SMSTATEEN0_HSENVCFG);
+ if (ret != RISCV_EXCP_NONE) {
+ return ret;
+ }
+ env->henvcfg = (env->henvcfg & ~mask) | (valh & mask);
return RISCV_EXCP_NONE;
}
--
2.17.1
^ permalink raw reply related [flat|nested] 5+ messages in thread* [RFC PATCH v1 3/4] target/riscv: smstateen check for fcsr
2022-03-22 13:42 [RFC PATCH v1 0/4] RISC-V Smstateen support Mayuresh Chitale
2022-03-22 13:42 ` [RFC PATCH v1 1/4] target/riscv: Add smstateen support Mayuresh Chitale
2022-03-22 13:42 ` [RFC PATCH v1 2/4] target/riscv: smstateen check for h/senvcfg Mayuresh Chitale
@ 2022-03-22 13:42 ` Mayuresh Chitale
2022-03-22 13:42 ` [RFC PATCH v1 4/4] target/riscv: smstateen check for AIA/IMSIC Mayuresh Chitale
3 siblings, 0 replies; 5+ messages in thread
From: Mayuresh Chitale @ 2022-03-22 13:42 UTC (permalink / raw)
To: qemu-riscv, qemu-devel; +Cc: Mayuresh Chitale, alistair.francis
If smstateen is implemented and sstateen0.fcsr is clear
then the floating point operations must return illegal
instruction exception.
Signed-off-by: Mayuresh Chitale <mchitale@ventanamicro.com>
---
target/riscv/csr.c | 24 ++++++++++++++++++++++++
1 file changed, 24 insertions(+)
diff --git a/target/riscv/csr.c b/target/riscv/csr.c
index 46761a6fa8..5d7381c771 100644
--- a/target/riscv/csr.c
+++ b/target/riscv/csr.c
@@ -75,6 +75,10 @@ static RISCVException fs(CPURISCVState *env, int csrno)
!RISCV_CPU(env_cpu(env))->cfg.ext_zfinx) {
return RISCV_EXCP_ILLEGAL_INST;
}
+
+ if (!env->debugger && !riscv_cpu_fp_enabled(env)) {
+ return smstateen_acc_ok(env, PRV_U, SMSTATEEN0_FCSR);
+ }
#endif
return RISCV_EXCP_NONE;
}
@@ -2005,6 +2009,10 @@ static RISCVException write_mstateen(CPURISCVState *env, int csrno,
uint64_t wr_mask = 1UL << SMSTATEEN_STATEN;
reg = &env->mstateen[csrno - CSR_MSTATEEN0];
+ if (riscv_has_ext(env, RVF)) {
+ wr_mask |= 1UL << SMSTATEEN0_FCSR;
+ }
+
write_smstateen(env, reg, wr_mask, new_val);
return RISCV_EXCP_NONE;
@@ -2028,6 +2036,10 @@ static RISCVException write_mstateenh(CPURISCVState *env, int csrno,
reg = &env->mstateen[csrno - CSR_MSTATEEN0H - 0x10];
val = (uint64_t)new_val << 32;
val |= *reg & 0xFFFFFFFF;
+ if (riscv_has_ext(env, RVF)) {
+ wr_mask |= 1UL << SMSTATEEN0_FCSR;
+ }
+
write_smstateen(env, reg, wr_mask, val);
return RISCV_EXCP_NONE;
@@ -2048,6 +2060,10 @@ static RISCVException write_hstateen(CPURISCVState *env, int csrno,
uint64_t wr_mask = 1UL << SMSTATEEN_STATEN;
int index = csrno - CSR_HSTATEEN0;
+ if (riscv_has_ext(env, RVF)) {
+ wr_mask |= 1UL << SMSTATEEN0_FCSR;
+ }
+
reg = &env->hstateen[index];
wr_mask &= env->mstateen[index];
write_smstateen(env, reg, wr_mask, new_val);
@@ -2071,6 +2087,10 @@ static RISCVException write_hstateenh(CPURISCVState *env, int csrno,
uint64_t wr_mask = 1UL << SMSTATEEN_STATEN;
int index = csrno - CSR_HSTATEEN0H - 0x10;
+ if (riscv_has_ext(env, RVF)) {
+ wr_mask |= 1UL << SMSTATEEN0_FCSR;
+ }
+
reg = &env->hstateen[index];
val = (uint64_t)new_val << 32;
val |= *reg & 0xFFFFFFFF;
@@ -2096,6 +2116,10 @@ static RISCVException write_sstateen(CPURISCVState *env, int csrno,
int index = csrno - CSR_SSTATEEN0;
bool virt = riscv_cpu_virt_enabled(env);
+ if (riscv_has_ext(env, RVF)) {
+ wr_mask |= 1UL << SMSTATEEN0_FCSR;
+ }
+
reg = &env->sstateen[index];
if (virt) {
wr_mask &= env->mstateen[index];
--
2.17.1
^ permalink raw reply related [flat|nested] 5+ messages in thread* [RFC PATCH v1 4/4] target/riscv: smstateen check for AIA/IMSIC
2022-03-22 13:42 [RFC PATCH v1 0/4] RISC-V Smstateen support Mayuresh Chitale
` (2 preceding siblings ...)
2022-03-22 13:42 ` [RFC PATCH v1 3/4] target/riscv: smstateen check for fcsr Mayuresh Chitale
@ 2022-03-22 13:42 ` Mayuresh Chitale
3 siblings, 0 replies; 5+ messages in thread
From: Mayuresh Chitale @ 2022-03-22 13:42 UTC (permalink / raw)
To: qemu-riscv, qemu-devel; +Cc: Mayuresh Chitale, alistair.francis
If smstateen is implemented then accesses to AIA
registers CSRS, IMSIC CSRs and other IMSIC registers
is controlled by setting of corresponding bits in
mstateen/hstateen registers. Otherwise an illegal
instruction trap or virtual instruction trap is
generated.
Signed-off-by: Mayuresh Chitale <mchitale@ventanamicro.com>
---
target/riscv/csr.c | 248 ++++++++++++++++++++++++++++++++++++++++++++-
1 file changed, 246 insertions(+), 2 deletions(-)
diff --git a/target/riscv/csr.c b/target/riscv/csr.c
index 5d7381c771..a8e17e4fe5 100644
--- a/target/riscv/csr.c
+++ b/target/riscv/csr.c
@@ -68,6 +68,53 @@ static RISCVException smstateen_acc_ok(CPURISCVState *env, int mode, int bit)
return RISCV_EXCP_NONE;
}
+static RISCVException smstateen_aia_acc_ok(CPURISCVState *env, int csrno)
+{
+ int bit, mode;
+
+ switch (csrno) {
+ case CSR_SSETEIPNUM:
+ case CSR_SCLREIPNUM:
+ case CSR_SSETEIENUM:
+ case CSR_SCLREIENUM:
+ case CSR_STOPEI:
+ case CSR_VSSETEIPNUM:
+ case CSR_VSCLREIPNUM:
+ case CSR_VSSETEIENUM:
+ case CSR_VSCLREIENUM:
+ case CSR_VSTOPEI:
+ case CSR_HSTATUS:
+ mode = PRV_S;
+ bit = SMSTATEEN0_IMSIC;
+ break;
+
+ case CSR_SIEH:
+ case CSR_SIPH:
+ case CSR_HVIPH:
+ case CSR_HVICTL:
+ case CSR_HVIPRIO1:
+ case CSR_HVIPRIO2:
+ case CSR_HVIPRIO1H:
+ case CSR_HVIPRIO2H:
+ case CSR_VSIEH:
+ case CSR_VSIPH:
+ mode = PRV_S;
+ bit = SMSTATEEN0_AIA;
+ break;
+
+ case CSR_SISELECT:
+ case CSR_VSISELECT:
+ mode = PRV_S;
+ bit = SMSTATEEN0_SVSLCT;
+ break;
+
+ default:
+ return RISCV_EXCP_NONE;
+ }
+
+ return smstateen_acc_ok(env, mode, bit);
+}
+
static RISCVException fs(CPURISCVState *env, int csrno)
{
#if !defined(CONFIG_USER_ONLY)
@@ -1402,6 +1449,13 @@ static int rmw_xiselect(CPURISCVState *env, int csrno, target_ulong *val,
target_ulong new_val, target_ulong wr_mask)
{
target_ulong *iselect;
+ RISCVException ret;
+
+ /* Check if smstateen is enabled and this access is allowed */
+ ret = smstateen_aia_acc_ok(env, csrno);
+ if (ret != RISCV_EXCP_NONE) {
+ return ret;
+ }
/* Translate CSR number for VS-mode */
csrno = aia_xlate_vs_csrno(env, csrno);
@@ -1484,7 +1538,9 @@ static int rmw_xireg(CPURISCVState *env, int csrno, target_ulong *val,
bool virt;
uint8_t *iprio;
int ret = -EINVAL;
- target_ulong priv, isel, vgein;
+ target_ulong priv, isel, vgein = 0;
+ CPUState *cs = env_cpu(env);
+ RISCVCPU *cpu = RISCV_CPU(cs);
/* Translate CSR number for VS-mode */
csrno = aia_xlate_vs_csrno(env, csrno);
@@ -1513,11 +1569,20 @@ static int rmw_xireg(CPURISCVState *env, int csrno, target_ulong *val,
};
/* Find the selected guest interrupt file */
- vgein = (virt) ? get_field(env->hstatus, HSTATUS_VGEIN) : 0;
+ if (virt) {
+ if (!cpu->cfg.ext_smstateen ||
+ (env->hstateen[0] & 1UL << SMSTATEEN0_IMSIC)) {
+ vgein = get_field(env->hstatus, HSTATUS_VGEIN);
+ }
+ }
if (ISELECT_IPRIO0 <= isel && isel <= ISELECT_IPRIO15) {
/* Local interrupt priority registers not available for VS-mode */
if (!virt) {
+ if (priv == PRV_S && cpu->cfg.ext_smstateen &&
+ !(env->hstateen[0] & 1UL << SMSTATEEN0_AIA)) {
+ goto done;
+ }
ret = rmw_iprio(riscv_cpu_mxl_bits(env),
isel, iprio, val, new_val, wr_mask,
(priv == PRV_M) ? IRQ_M_EXT : IRQ_S_EXT);
@@ -1551,6 +1616,13 @@ static int rmw_xsetclreinum(CPURISCVState *env, int csrno, target_ulong *val,
int ret = -EINVAL;
bool set, pend, virt;
target_ulong priv, isel, vgein, xlen, nval, wmask;
+ RISCVException excp;
+
+ /* Check if smstateen is enabled and this access is allowed */
+ excp = smstateen_aia_acc_ok(env, csrno);
+ if (excp != RISCV_EXCP_NONE) {
+ return excp;
+ }
/* Translate CSR number for VS-mode */
csrno = aia_xlate_vs_csrno(env, csrno);
@@ -1669,6 +1741,13 @@ static int rmw_xtopei(CPURISCVState *env, int csrno, target_ulong *val,
bool virt;
int ret = -EINVAL;
target_ulong priv, vgein;
+ RISCVException excp;
+
+ /* Check if smstateen is enabled and this access is allowed */
+ excp = smstateen_aia_acc_ok(env, csrno);
+ if (excp != RISCV_EXCP_NONE) {
+ return excp;
+ }
/* Translate CSR number for VS-mode */
csrno = aia_xlate_vs_csrno(env, csrno);
@@ -2013,6 +2092,12 @@ static RISCVException write_mstateen(CPURISCVState *env, int csrno,
wr_mask |= 1UL << SMSTATEEN0_FCSR;
}
+ if (riscv_feature(env, RISCV_FEATURE_AIA)) {
+ wr_mask |= (1UL << SMSTATEEN0_IMSIC)
+ | (1UL << SMSTATEEN0_AIA)
+ | (1UL << SMSTATEEN0_SVSLCT);
+ }
+
write_smstateen(env, reg, wr_mask, new_val);
return RISCV_EXCP_NONE;
@@ -2040,6 +2125,12 @@ static RISCVException write_mstateenh(CPURISCVState *env, int csrno,
wr_mask |= 1UL << SMSTATEEN0_FCSR;
}
+ if (riscv_feature(env, RISCV_FEATURE_AIA)) {
+ wr_mask |= (1UL << SMSTATEEN0_IMSIC)
+ | (1UL << SMSTATEEN0_AIA)
+ | (1UL << SMSTATEEN0_SVSLCT);
+ }
+
write_smstateen(env, reg, wr_mask, val);
return RISCV_EXCP_NONE;
@@ -2064,6 +2155,12 @@ static RISCVException write_hstateen(CPURISCVState *env, int csrno,
wr_mask |= 1UL << SMSTATEEN0_FCSR;
}
+ if (riscv_feature(env, RISCV_FEATURE_AIA)) {
+ wr_mask |= (1UL << SMSTATEEN0_IMSIC)
+ | (1UL << SMSTATEEN0_AIA)
+ | (1UL << SMSTATEEN0_SVSLCT);
+ }
+
reg = &env->hstateen[index];
wr_mask &= env->mstateen[index];
write_smstateen(env, reg, wr_mask, new_val);
@@ -2091,6 +2188,12 @@ static RISCVException write_hstateenh(CPURISCVState *env, int csrno,
wr_mask |= 1UL << SMSTATEEN0_FCSR;
}
+ if (riscv_feature(env, RISCV_FEATURE_AIA)) {
+ wr_mask |= (1UL << SMSTATEEN0_IMSIC)
+ | (1UL << SMSTATEEN0_AIA)
+ | (1UL << SMSTATEEN0_SVSLCT);
+ }
+
reg = &env->hstateen[index];
val = (uint64_t)new_val << 32;
val |= *reg & 0xFFFFFFFF;
@@ -2284,6 +2387,12 @@ static RISCVException rmw_vsieh(CPURISCVState *env, int csrno,
uint64_t rval;
RISCVException ret;
+ /* Check if smstateen is enabled and this access is allowed */
+ ret = smstateen_aia_acc_ok(env, csrno);
+ if (ret != RISCV_EXCP_NONE) {
+ return ret;
+ }
+
ret = rmw_vsie64(env, csrno, &rval,
((uint64_t)new_val) << 32, ((uint64_t)wr_mask) << 32);
if (ret_val) {
@@ -2338,6 +2447,12 @@ static RISCVException rmw_sieh(CPURISCVState *env, int csrno,
uint64_t rval;
RISCVException ret;
+ /* Check if smstateen is enabled and this access is allowed */
+ ret = smstateen_aia_acc_ok(env, csrno);
+ if (ret != RISCV_EXCP_NONE) {
+ return ret;
+ }
+
ret = rmw_sie64(env, csrno, &rval,
((uint64_t)new_val) << 32, ((uint64_t)wr_mask) << 32);
if (ret_val) {
@@ -2500,6 +2615,12 @@ static RISCVException rmw_vsiph(CPURISCVState *env, int csrno,
uint64_t rval;
RISCVException ret;
+ /* Check if smstateen is enabled and this access is allowed */
+ ret = smstateen_aia_acc_ok(env, csrno);
+ if (ret != RISCV_EXCP_NONE) {
+ return ret;
+ }
+
ret = rmw_vsip64(env, csrno, &rval,
((uint64_t)new_val) << 32, ((uint64_t)wr_mask) << 32);
if (ret_val) {
@@ -2554,6 +2675,12 @@ static RISCVException rmw_siph(CPURISCVState *env, int csrno,
uint64_t rval;
RISCVException ret;
+ /* Check if smstateen is enabled and this access is allowed */
+ ret = smstateen_aia_acc_ok(env, csrno);
+ if (ret != RISCV_EXCP_NONE) {
+ return ret;
+ }
+
ret = rmw_sip64(env, csrno, &rval,
((uint64_t)new_val) << 32, ((uint64_t)wr_mask) << 32);
if (ret_val) {
@@ -2744,6 +2871,10 @@ static RISCVException read_hstatus(CPURISCVState *env, int csrno,
static RISCVException write_hstatus(CPURISCVState *env, int csrno,
target_ulong val)
{
+ if (smstateen_aia_acc_ok(env, csrno) != RISCV_EXCP_NONE) {
+ val &= ~HSTATUS_VGEIN;
+ }
+
env->hstatus = val;
if (riscv_cpu_mxl(env) != MXL_RV32 && get_field(val, HSTATUS_VSXL) != 2) {
qemu_log_mask(LOG_UNIMP, "QEMU does not support mixed HSXLEN options.");
@@ -2804,6 +2935,12 @@ static RISCVException rmw_hidelegh(CPURISCVState *env, int csrno,
uint64_t rval;
RISCVException ret;
+ /* Check if smstateen is enabled and this access is allowed */
+ ret = smstateen_aia_acc_ok(env, csrno);
+ if (ret != RISCV_EXCP_NONE) {
+ return ret;
+ }
+
ret = rmw_hideleg64(env, csrno, &rval,
((uint64_t)new_val) << 32, ((uint64_t)wr_mask) << 32);
if (ret_val) {
@@ -2850,6 +2987,12 @@ static RISCVException rmw_hviph(CPURISCVState *env, int csrno,
uint64_t rval;
RISCVException ret;
+ /* Check if smstateen is enabled and this access is allowed */
+ ret = smstateen_aia_acc_ok(env, csrno);
+ if (ret != RISCV_EXCP_NONE) {
+ return ret;
+ }
+
ret = rmw_hvip64(env, csrno, &rval,
((uint64_t)new_val) << 32, ((uint64_t)wr_mask) << 32);
if (ret_val) {
@@ -2904,6 +3047,13 @@ static RISCVException write_hcounteren(CPURISCVState *env, int csrno,
static RISCVException read_hgeie(CPURISCVState *env, int csrno,
target_ulong *val)
{
+ RISCVException ret;
+
+ ret = smstateen_acc_ok(env, PRV_S, SMSTATEEN0_IMSIC);
+ if (ret != RISCV_EXCP_NONE) {
+ return ret;
+ }
+
if (val) {
*val = env->hgeie;
}
@@ -2913,6 +3063,13 @@ static RISCVException read_hgeie(CPURISCVState *env, int csrno,
static RISCVException write_hgeie(CPURISCVState *env, int csrno,
target_ulong val)
{
+ RISCVException ret;
+
+ ret = smstateen_acc_ok(env, PRV_S, SMSTATEEN0_IMSIC);
+ if (ret != RISCV_EXCP_NONE) {
+ return ret;
+ }
+
/* Only GEILEN:1 bits implemented and BIT0 is never implemented */
val &= ((((target_ulong)1) << env->geilen) - 1) << 1;
env->hgeie = val;
@@ -2952,6 +3109,13 @@ static RISCVException write_htinst(CPURISCVState *env, int csrno,
static RISCVException read_hgeip(CPURISCVState *env, int csrno,
target_ulong *val)
{
+ RISCVException ret;
+
+ ret = smstateen_acc_ok(env, PRV_S, SMSTATEEN0_IMSIC);
+ if (ret != RISCV_EXCP_NONE) {
+ return ret;
+ }
+
if (val) {
*val = env->hgeip;
}
@@ -3022,12 +3186,28 @@ static RISCVException write_htimedeltah(CPURISCVState *env, int csrno,
static int read_hvictl(CPURISCVState *env, int csrno, target_ulong *val)
{
+ RISCVException ret;
+
+ /* Check if smstateen is enabled and this access is allowed */
+ ret = smstateen_aia_acc_ok(env, csrno);
+ if (ret != RISCV_EXCP_NONE) {
+ return ret;
+ }
+
*val = env->hvictl;
return RISCV_EXCP_NONE;
}
static int write_hvictl(CPURISCVState *env, int csrno, target_ulong val)
{
+ RISCVException ret = RISCV_EXCP_NONE;
+
+ /* Check if smstateen is enabled and this access is allowed */
+ ret = smstateen_aia_acc_ok(env, csrno);
+ if (ret != RISCV_EXCP_NONE) {
+ return ret;
+ }
+
env->hvictl = val & HVICTL_VALID_MASK;
return RISCV_EXCP_NONE;
}
@@ -3086,41 +3266,105 @@ static int write_hvipriox(CPURISCVState *env, int first_index,
static int read_hviprio1(CPURISCVState *env, int csrno, target_ulong *val)
{
+ RISCVException ret;
+
+ /* Check if smstateen is enabled and this access is allowed */
+ ret = smstateen_aia_acc_ok(env, csrno);
+ if (ret != RISCV_EXCP_NONE) {
+ return ret;
+ }
+
return read_hvipriox(env, 0, env->hviprio, val);
}
static int write_hviprio1(CPURISCVState *env, int csrno, target_ulong val)
{
+ RISCVException ret;
+
+ /* Check if smstateen is enabled and this access is allowed */
+ ret = smstateen_aia_acc_ok(env, csrno);
+ if (ret != RISCV_EXCP_NONE) {
+ return ret;
+ }
+
return write_hvipriox(env, 0, env->hviprio, val);
}
static int read_hviprio1h(CPURISCVState *env, int csrno, target_ulong *val)
{
+ RISCVException ret;
+
+ /* Check if smstateen is enabled and this access is allowed */
+ ret = smstateen_aia_acc_ok(env, csrno);
+ if (ret != RISCV_EXCP_NONE) {
+ return ret;
+ }
+
return read_hvipriox(env, 4, env->hviprio, val);
}
static int write_hviprio1h(CPURISCVState *env, int csrno, target_ulong val)
{
+ RISCVException ret;
+
+ /* Check if smstateen is enabled and this access is allowed */
+ ret = smstateen_aia_acc_ok(env, csrno);
+ if (ret != RISCV_EXCP_NONE) {
+ return ret;
+ }
+
return write_hvipriox(env, 4, env->hviprio, val);
}
static int read_hviprio2(CPURISCVState *env, int csrno, target_ulong *val)
{
+ RISCVException ret;
+
+ /* Check if smstateen is enabled and this access is allowed */
+ ret = smstateen_aia_acc_ok(env, csrno);
+ if (ret != RISCV_EXCP_NONE) {
+ return ret;
+ }
+
return read_hvipriox(env, 8, env->hviprio, val);
}
static int write_hviprio2(CPURISCVState *env, int csrno, target_ulong val)
{
+ RISCVException ret;
+
+ /* Check if smstateen is enabled and this access is allowed */
+ ret = smstateen_aia_acc_ok(env, csrno);
+ if (ret != RISCV_EXCP_NONE) {
+ return ret;
+ }
+
return write_hvipriox(env, 8, env->hviprio, val);
}
static int read_hviprio2h(CPURISCVState *env, int csrno, target_ulong *val)
{
+ RISCVException ret;
+
+ /* Check if smstateen is enabled and this access is allowed */
+ ret = smstateen_aia_acc_ok(env, csrno);
+ if (ret != RISCV_EXCP_NONE) {
+ return ret;
+ }
+
return read_hvipriox(env, 12, env->hviprio, val);
}
static int write_hviprio2h(CPURISCVState *env, int csrno, target_ulong val)
{
+ RISCVException ret;
+
+ /* Check if smstateen is enabled and this access is allowed */
+ ret = smstateen_aia_acc_ok(env, csrno);
+ if (ret != RISCV_EXCP_NONE) {
+ return ret;
+ }
+
return write_hvipriox(env, 12, env->hviprio, val);
}
--
2.17.1
^ permalink raw reply related [flat|nested] 5+ messages in thread