target/riscv: Allow setting a two-stage lookup in the virt status

Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
Message-id: 08cdefb171b1bdb0c9e3151c509aaadefc3dcd3e.1597259519.git.alistair.francis@wdc.com
Message-Id: <08cdefb171b1bdb0c9e3151c509aaadefc3dcd3e.1597259519.git.alistair.francis@wdc.com>

3 files changed, 21 insertions, 0 deletions

diff --git a/target/riscv/cpu.h b/target/riscv/cpu.h
index a804a5d0ba..383808bf88 100644
--- a/target/riscv/cpu.h
+++ b/target/riscv/cpu.h
@@ -321,6 +321,8 @@ 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 8117e8b5a7..ba0a5b50ff 100644
--- a/target/riscv/cpu_bits.h
+++ b/target/riscv/cpu_bits.h
@@ -467,6 +467,7 @@
  * 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 fd1d373b6f..e5e0d80c32 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;