[PATCH v2 2/3] target/riscv/kvm: add kvm_riscv_reset_regs_csr()

[Daniel Henrique Barboza <dbarboza@ventanamicro.com>]

We're setting reset vals for KVM csrs during kvm_riscv_reset_vcpu(), but
in no particular order and missing some of them (like env->mstatus).

Create a helper to do that, unclogging reset_vcpu(), and initialize
env->mstatus as well. Keep the regs in the same order they appear in
struct kvm_riscv_csr from the KVM UAPI, similar to what
kvm_riscv_(get|put)_regs_csr are doing. This will make a bit easier to
add new KVM CSRs and to verify which values we're writing back to KVM
during vcpu reset.

Signed-off-by: Daniel Henrique Barboza <dbarboza@ventanamicro.com>
---
 target/riscv/kvm/kvm-cpu.c | 23 +++++++++++++++--------
 1 file changed, 15 insertions(+), 8 deletions(-)

diff --git a/target/riscv/kvm/kvm-cpu.c b/target/riscv/kvm/kvm-cpu.c
index 484b6afe7c..f14fcc58bb 100644
--- a/target/riscv/kvm/kvm-cpu.c
+++ b/target/riscv/kvm/kvm-cpu.c
@@ -605,6 +605,19 @@ static int kvm_riscv_put_regs_core(CPUState *cs)
     return ret;
 }
 
+static void kvm_riscv_reset_regs_csr(CPURISCVState *env)
+{
+    env->mstatus = 0;
+    env->mie = 0;
+    env->stvec = 0;
+    env->sscratch = 0;
+    env->sepc = 0;
+    env->scause = 0;
+    env->stval = 0;
+    env->mip = 0;
+    env->satp = 0;
+}
+
 static int kvm_riscv_get_regs_csr(CPUState *cs)
 {
     CPURISCVState *env = &RISCV_CPU(cs)->env;
@@ -1609,14 +1622,8 @@ void kvm_riscv_reset_vcpu(RISCVCPU *cpu)
     env->pc = cpu->env.kernel_addr;
     env->gpr[10] = kvm_arch_vcpu_id(CPU(cpu)); /* a0 */
     env->gpr[11] = cpu->env.fdt_addr;          /* a1 */
-    env->satp = 0;
-    env->mie = 0;
-    env->stvec = 0;
-    env->sscratch = 0;
-    env->sepc = 0;
-    env->scause = 0;
-    env->stval = 0;
-    env->mip = 0;
+
+    kvm_riscv_reset_regs_csr(env);
 }
 
 void kvm_riscv_set_irq(RISCVCPU *cpu, int irq, int level)
-- 
2.48.1