[PATCH v1 05/15] target/riscv: Allow setting a two-stage lookup in the virt status

[Alistair Francis]

Signed-off-by: Alistair Francis <alistair.fran...@wdc.com>
---
 target/riscv/cpu.h        |  2 ++
 target/riscv/cpu_bits.h   |  1 +
 target/riscv/cpu_helper.c | 18 ++++++++++++++++++
 3 files changed, 21 insertions(+)

diff --git a/target/riscv/cpu.h b/target/riscv/cpu.h
index d0e7f5b9c5..e44a7a91e4 100644
--- a/target/riscv/cpu.h
+++ b/target/riscv/cpu.h
@@ -302,6 +302,8 @@ bool riscv_cpu_virt_enabled(CPURISCVState *env);
 void riscv_cpu_set_virt_enabled(CPURISCVState *env, bool enable);
 bool riscv_cpu_force_hs_excep_enabled(CPURISCVState *env);
 void riscv_cpu_set_force_hs_excep(CPURISCVState *env, bool enable);
+bool riscv_cpu_two_stage_lookup(CPURISCVState *env);
+void riscv_cpu_set_two_stage_lookup(CPURISCVState *env, bool enable);
 int riscv_cpu_mmu_index(CPURISCVState *env, bool ifetch);
 hwaddr riscv_cpu_get_phys_page_debug(CPUState *cpu, vaddr addr);
 void  riscv_cpu_do_unaligned_access(CPUState *cs, vaddr addr,
diff --git a/target/riscv/cpu_bits.h b/target/riscv/cpu_bits.h
index 7f64ee1174..f52711ac32 100644
--- a/target/riscv/cpu_bits.h
+++ b/target/riscv/cpu_bits.h
@@ -452,6 +452,7 @@
  * page table fault.
  */
 #define FORCE_HS_EXCEP      2
+#define HS_TWO_STAGE        4
 
 /* RV32 satp CSR field masks */
 #define SATP32_MODE         0x80000000
diff --git a/target/riscv/cpu_helper.c b/target/riscv/cpu_helper.c
index 0d4a7b752d..075675c59c 100644
--- a/target/riscv/cpu_helper.c
+++ b/target/riscv/cpu_helper.c
@@ -220,6 +220,24 @@ void riscv_cpu_set_force_hs_excep(CPURISCVState *env, bool 
enable)
     env->virt = set_field(env->virt, FORCE_HS_EXCEP, enable);
 }
 
+bool riscv_cpu_two_stage_lookup(CPURISCVState *env)
+{
+    if (!riscv_has_ext(env, RVH)) {
+        return false;
+    }
+
+    return get_field(env->virt, HS_TWO_STAGE);
+}
+
+void riscv_cpu_set_two_stage_lookup(CPURISCVState *env, bool enable)
+{
+    if (!riscv_has_ext(env, RVH)) {
+        return;
+    }
+
+    env->virt = set_field(env->virt, HS_TWO_STAGE, enable);
+}
+
 int riscv_cpu_claim_interrupts(RISCVCPU *cpu, uint32_t interrupts)
 {
     CPURISCVState *env = &cpu->env;
-- 
2.26.2