[PATCH RFC v4 04/15] target/riscv: Implement kvm_arch_get_registers

[Yifei Jiang <jiangyifei@xxxxxxxxxx>]

Get GPR CSR and FP registers from kvm by KVM_GET_ONE_REG ioctl.

Signed-off-by: Yifei Jiang <jiangyifei@xxxxxxxxxx>
Signed-off-by: Yipeng Yin <yinyipeng1@xxxxxxxxxx>
---
 target/riscv/kvm.c | 150 ++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 149 insertions(+), 1 deletion(-)

diff --git a/target/riscv/kvm.c b/target/riscv/kvm.c
index 86660ba81b..e679619e79 100644
--- a/target/riscv/kvm.c
+++ b/target/riscv/kvm.c
@@ -50,13 +50,161 @@ static __u64 kvm_riscv_reg_id(__u64 type, __u64 idx)
     return id;
 }
 
+#define RISCV_CORE_REG(name)  kvm_riscv_reg_id(KVM_REG_RISCV_CORE, \
+                 KVM_REG_RISCV_CORE_REG(name))
+
+#define RISCV_CSR_REG(name)  kvm_riscv_reg_id(KVM_REG_RISCV_CSR, \
+                 KVM_REG_RISCV_CSR_REG(name))
+
+#define RISCV_FP_F_REG(idx)  kvm_riscv_reg_id(KVM_REG_RISCV_FP_F, idx)
+
+#define RISCV_FP_D_REG(idx)  kvm_riscv_reg_id(KVM_REG_RISCV_FP_D, idx)
+
+static int kvm_riscv_get_regs_core(CPUState *cs)
+{
+    int ret = 0;
+    int i;
+    target_ulong reg;
+    CPURISCVState *env = &RISCV_CPU(cs)->env;
+
+    ret = kvm_get_one_reg(cs, RISCV_CORE_REG(regs.pc), &reg);
+    if (ret) {
+        return ret;
+    }
+    env->pc = reg;
+
+    for (i = 1; i < 32; i++) {
+        __u64 id = kvm_riscv_reg_id(KVM_REG_RISCV_CORE, i);
+        ret = kvm_get_one_reg(cs, id, &reg);
+        if (ret) {
+            return ret;
+        }
+        env->gpr[i] = reg;
+    }
+
+    return ret;
+}
+
+static int kvm_riscv_get_regs_csr(CPUState *cs)
+{
+    int ret = 0;
+    target_ulong reg;
+    CPURISCVState *env = &RISCV_CPU(cs)->env;
+
+    ret = kvm_get_one_reg(cs, RISCV_CSR_REG(sstatus), &reg);
+    if (ret) {
+        return ret;
+    }
+    env->mstatus = reg;
+
+    ret = kvm_get_one_reg(cs, RISCV_CSR_REG(sie), &reg);
+    if (ret) {
+        return ret;
+    }
+    env->mie = reg;
+
+    ret = kvm_get_one_reg(cs, RISCV_CSR_REG(stvec), &reg);
+    if (ret) {
+        return ret;
+    }
+    env->stvec = reg;
+
+    ret = kvm_get_one_reg(cs, RISCV_CSR_REG(sscratch), &reg);
+    if (ret) {
+        return ret;
+    }
+    env->sscratch = reg;
+
+    ret = kvm_get_one_reg(cs, RISCV_CSR_REG(sepc), &reg);
+    if (ret) {
+        return ret;
+    }
+    env->sepc = reg;
+
+    ret = kvm_get_one_reg(cs, RISCV_CSR_REG(scause), &reg);
+    if (ret) {
+        return ret;
+    }
+    env->scause = reg;
+
+    ret = kvm_get_one_reg(cs, RISCV_CSR_REG(stval), &reg);
+    if (ret) {
+        return ret;
+    }
+    env->sbadaddr = reg;
+
+    ret = kvm_get_one_reg(cs, RISCV_CSR_REG(sip), &reg);
+    if (ret) {
+        return ret;
+    }
+    env->mip = reg;
+
+    ret = kvm_get_one_reg(cs, RISCV_CSR_REG(satp), &reg);
+    if (ret) {
+        return ret;
+    }
+    env->satp = reg;
+
+    return ret;
+}
+
+static int kvm_riscv_get_regs_fp(CPUState *cs)
+{
+    int ret = 0;
+    int i;
+    CPURISCVState *env = &RISCV_CPU(cs)->env;
+
+    if (riscv_has_ext(env, RVD)) {
+        uint64_t reg;
+        for (i = 0; i < 32; i++) {
+            ret = kvm_get_one_reg(cs, RISCV_FP_D_REG(i), &reg);
+            if (ret) {
+                return ret;
+            }
+            env->fpr[i] = reg;
+        }
+        return ret;
+    }
+
+    if (riscv_has_ext(env, RVF)) {
+        uint32_t reg;
+        for (i = 0; i < 32; i++) {
+            ret = kvm_get_one_reg(cs, RISCV_FP_F_REG(i), &reg);
+            if (ret) {
+                return ret;
+            }
+            env->fpr[i] = reg;
+        }
+        return ret;
+    }
+
+    return ret;
+}
+
 const KVMCapabilityInfo kvm_arch_required_capabilities[] = {
     KVM_CAP_LAST_INFO
 };
 
 int kvm_arch_get_registers(CPUState *cs)
 {
-    return 0;
+    int ret = 0;
+
+    ret = kvm_riscv_get_regs_core(cs);
+    if (ret) {
+        return ret;
+    }
+
+    ret = kvm_riscv_get_regs_csr(cs);
+    if (ret) {
+        return ret;
+    }
+
+    ret = kvm_riscv_get_regs_fp(cs);
+    if (ret) {
+        return ret;
+    }
+
+    return ret;
 }
 
 int kvm_arch_put_registers(CPUState *cs, int level)
-- 
2.19.1