target/riscv/kvm: add kvm_csr_cfgs[]

At this moment we're not checking if the host has support for any
specific CSR before doing get/put regs. This will cause problems if the
host KVM doesn't support it (see [1] as an example).

We'll use the same approach done with the CPU extensions: read all known
KVM CSRs during init() to check for availability, then read/write them
if they are present. This will be made by either using get-reglist or by
directly reading the CSRs.

For now we'll just convert the CSRs to use a kvm_csr_cfg[] array,
reusing the same KVMCPUConfig abstraction we use for extensions, and use
the array in (get|put)_csr_regs() instead of manually listing them. A
lot of boilerplate will be added but at least we'll automate the get/put
procedure for CSRs, i.e. adding a new CSR in the future will be a matter
of adding it in kvm_csr_regs[] and everything else will be taken care
of.

Despite all the code changes no behavioral change is made.

[1] https://lore.kernel.org/qemu-riscv/CABJz62OfUDHYkQ0T3rGHStQprf1c7_E0qBLbLKhfv=+jb0SYAw@mail.gmail.com/

Signed-off-by: Daniel Henrique Barboza <dbarboza@ventanamicro.com>
Reviewed-by: Andrew Jones <ajones@ventanamicro.com>
Acked-by: Alistair Francis <alistair.francis@wdc.com>
Message-ID: <20250429124421.223883-6-dbarboza@ventanamicro.com>
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
Cc: qemu-stable@nongnu.org

2 files changed, 86 insertions, 36 deletions

diff --git a/target/riscv/cpu.h b/target/riscv/cpu.h
index ff7ba2a..b56d3af 100644
--- a/target/riscv/cpu.h
+++ b/target/riscv/cpu.h
@@ -75,6 +75,7 @@ const char *riscv_get_misa_ext_name(uint32_t bit);
 const char *riscv_get_misa_ext_description(uint32_t bit);
 
 #define CPU_CFG_OFFSET(_prop) offsetof(struct RISCVCPUConfig, _prop)
+#define ENV_CSR_OFFSET(_csr) offsetof(CPURISCVState, _csr)
 
 typedef struct riscv_cpu_profile {
     struct riscv_cpu_profile *u_parent;
diff --git a/target/riscv/kvm/kvm-cpu.c b/target/riscv/kvm/kvm-cpu.c
index 509c875..3740514 100644
--- a/target/riscv/kvm/kvm-cpu.c
+++ b/target/riscv/kvm/kvm-cpu.c
@@ -114,22 +114,6 @@ static uint64_t kvm_riscv_vector_reg_id(RISCVCPU *cpu,
     KVM_RISCV_REG_ID_ULONG(KVM_REG_RISCV_VECTOR, \
                            KVM_REG_RISCV_VECTOR_CSR_REG(name))
 
-#define KVM_RISCV_GET_CSR(cs, env, csr, reg) \
-    do { \
-        int _ret = kvm_get_one_reg(cs, RISCV_CSR_REG(csr), &reg); \
-        if (_ret) { \
-            return _ret; \
-        } \
-    } while (0)
-
-#define KVM_RISCV_SET_CSR(cs, env, csr, reg) \
-    do { \
-        int _ret = kvm_set_one_reg(cs, RISCV_CSR_REG(csr), &reg); \
-        if (_ret) { \
-            return _ret; \
-        } \
-    } while (0)
-
 #define KVM_RISCV_GET_TIMER(cs, name, reg) \
     do { \
         int ret = kvm_get_one_reg(cs, RISCV_TIMER_REG(name), &reg); \
@@ -251,6 +235,53 @@ static void kvm_riscv_update_cpu_misa_ext(RISCVCPU *cpu, CPUState *cs)
     }
 }
 
+#define KVM_CSR_CFG(_name, _env_prop, reg_id) \
+    {.name = _name, .offset = ENV_CSR_OFFSET(_env_prop), \
+     .kvm_reg_id = reg_id}
+
+static KVMCPUConfig kvm_csr_cfgs[] = {
+    KVM_CSR_CFG("sstatus",    mstatus,    RISCV_CSR_REG(sstatus)),
+    KVM_CSR_CFG("sie",        mie,        RISCV_CSR_REG(sie)),
+    KVM_CSR_CFG("stvec",      stvec,      RISCV_CSR_REG(stvec)),
+    KVM_CSR_CFG("sscratch",   sscratch,   RISCV_CSR_REG(sscratch)),
+    KVM_CSR_CFG("sepc",       sepc,       RISCV_CSR_REG(sepc)),
+    KVM_CSR_CFG("scause",     scause,     RISCV_CSR_REG(scause)),
+    KVM_CSR_CFG("stval",      stval,      RISCV_CSR_REG(stval)),
+    KVM_CSR_CFG("sip",        mip,        RISCV_CSR_REG(sip)),
+    KVM_CSR_CFG("satp",       satp,       RISCV_CSR_REG(satp)),
+};
+
+static void *kvmconfig_get_env_addr(RISCVCPU *cpu, KVMCPUConfig *csr_cfg)
+{
+    return (void *)&cpu->env + csr_cfg->offset;
+}
+
+static uint32_t kvm_cpu_csr_get_u32(RISCVCPU *cpu, KVMCPUConfig *csr_cfg)
+{
+    uint32_t *val32 = kvmconfig_get_env_addr(cpu, csr_cfg);
+    return *val32;
+}
+
+static uint64_t kvm_cpu_csr_get_u64(RISCVCPU *cpu, KVMCPUConfig *csr_cfg)
+{
+    uint64_t *val64 = kvmconfig_get_env_addr(cpu, csr_cfg);
+    return *val64;
+}
+
+static void kvm_cpu_csr_set_u32(RISCVCPU *cpu, KVMCPUConfig *csr_cfg,
+                                uint32_t val)
+{
+    uint32_t *val32 = kvmconfig_get_env_addr(cpu, csr_cfg);
+    *val32 = val;
+}
+
+static void kvm_cpu_csr_set_u64(RISCVCPU *cpu, KVMCPUConfig *csr_cfg,
+                                uint64_t val)
+{
+    uint64_t *val64 = kvmconfig_get_env_addr(cpu, csr_cfg);
+    *val64 = val;
+}
+
 #define KVM_EXT_CFG(_name, _prop, _reg_id) \
     {.name = _name, .offset = CPU_CFG_OFFSET(_prop), \
      .kvm_reg_id = _reg_id}
@@ -598,34 +629,52 @@ static int kvm_riscv_put_regs_core(CPUState *cs)
 
 static int kvm_riscv_get_regs_csr(CPUState *cs)
 {
-    CPURISCVState *env = &RISCV_CPU(cs)->env;
+    RISCVCPU *cpu = RISCV_CPU(cs);
+    uint64_t reg;
+    int i, ret;
+
+    for (i = 0; i < ARRAY_SIZE(kvm_csr_cfgs); i++) {
+        KVMCPUConfig *csr_cfg = &kvm_csr_cfgs[i];
 
-    KVM_RISCV_GET_CSR(cs, env, sstatus, env->mstatus);
-    KVM_RISCV_GET_CSR(cs, env, sie, env->mie);
-    KVM_RISCV_GET_CSR(cs, env, stvec, env->stvec);
-    KVM_RISCV_GET_CSR(cs, env, sscratch, env->sscratch);
-    KVM_RISCV_GET_CSR(cs, env, sepc, env->sepc);
-    KVM_RISCV_GET_CSR(cs, env, scause, env->scause);
-    KVM_RISCV_GET_CSR(cs, env, stval, env->stval);
-    KVM_RISCV_GET_CSR(cs, env, sip, env->mip);
-    KVM_RISCV_GET_CSR(cs, env, satp, env->satp);
+        ret = kvm_get_one_reg(cs, csr_cfg->kvm_reg_id, &reg);
+        if (ret) {
+            return ret;
+        }
+
+        if (KVM_REG_SIZE(csr_cfg->kvm_reg_id) == sizeof(uint32_t)) {
+            kvm_cpu_csr_set_u32(cpu, csr_cfg, reg);
+        } else if (KVM_REG_SIZE(csr_cfg->kvm_reg_id) == sizeof(uint64_t)) {
+            kvm_cpu_csr_set_u64(cpu, csr_cfg, reg);
+        } else {
+            g_assert_not_reached();
+        }
+    }
 
     return 0;
 }
 
 static int kvm_riscv_put_regs_csr(CPUState *cs)
 {
-    CPURISCVState *env = &RISCV_CPU(cs)->env;
+    RISCVCPU *cpu = RISCV_CPU(cs);
+    uint64_t reg;
+    int i, ret;
+
+    for (i = 0; i < ARRAY_SIZE(kvm_csr_cfgs); i++) {
+        KVMCPUConfig *csr_cfg = &kvm_csr_cfgs[i];
+
+        if (KVM_REG_SIZE(csr_cfg->kvm_reg_id) == sizeof(uint32_t)) {
+            reg = kvm_cpu_csr_get_u32(cpu, csr_cfg);
+        } else if (KVM_REG_SIZE(csr_cfg->kvm_reg_id) == sizeof(uint64_t)) {
+            reg = kvm_cpu_csr_get_u64(cpu, csr_cfg);
+        } else {
+            g_assert_not_reached();
+        }
 
-    KVM_RISCV_SET_CSR(cs, env, sstatus, env->mstatus);
-    KVM_RISCV_SET_CSR(cs, env, sie, env->mie);
-    KVM_RISCV_SET_CSR(cs, env, stvec, env->stvec);
-    KVM_RISCV_SET_CSR(cs, env, sscratch, env->sscratch);
-    KVM_RISCV_SET_CSR(cs, env, sepc, env->sepc);
-    KVM_RISCV_SET_CSR(cs, env, scause, env->scause);
-    KVM_RISCV_SET_CSR(cs, env, stval, env->stval);
-    KVM_RISCV_SET_CSR(cs, env, sip, env->mip);
-    KVM_RISCV_SET_CSR(cs, env, satp, env->satp);
+        ret = kvm_set_one_reg(cs, csr_cfg->kvm_reg_id, &reg);
+        if (ret) {
+            return ret;
+        }
+    }
 
     return 0;
 }