[PATCH v4 2/3] target/riscv: Fixup setting GVA

[Alistair Francis]

From: Alistair Francis <alistair.francis@wdc.com>

In preperation for adding support for the illegal instruction address
let's fixup the Hypervisor extension setting GVA logic and improve the
variable names.

Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
---
 target/riscv/cpu_helper.c | 21 ++++++---------------
 1 file changed, 6 insertions(+), 15 deletions(-)

diff --git a/target/riscv/cpu_helper.c b/target/riscv/cpu_helper.c
index 9eeed38c7e..9e1f5ee177 100644
--- a/target/riscv/cpu_helper.c
+++ b/target/riscv/cpu_helper.c
@@ -967,6 +967,7 @@ void riscv_cpu_do_interrupt(CPUState *cs)
 
     RISCVCPU *cpu = RISCV_CPU(cs);
     CPURISCVState *env = &cpu->env;
+    bool write_gva = false;
     uint64_t s;
 
     /* cs->exception is 32-bits wide unlike mcause which is XLEN-bits wide
@@ -975,7 +976,6 @@ void riscv_cpu_do_interrupt(CPUState *cs)
     bool async = !!(cs->exception_index & RISCV_EXCP_INT_FLAG);
     target_ulong cause = cs->exception_index & RISCV_EXCP_INT_MASK;
     target_ulong deleg = async ? env->mideleg : env->medeleg;
-    bool write_tval = false;
     target_ulong tval = 0;
     target_ulong htval = 0;
     target_ulong mtval2 = 0;
@@ -1004,7 +1004,7 @@ void riscv_cpu_do_interrupt(CPUState *cs)
         case RISCV_EXCP_INST_PAGE_FAULT:
         case RISCV_EXCP_LOAD_PAGE_FAULT:
         case RISCV_EXCP_STORE_PAGE_FAULT:
-            write_tval  = true;
+            write_gva = true;
             tval = env->badaddr;
             break;
         default:
@@ -1041,18 +1041,6 @@ void riscv_cpu_do_interrupt(CPUState *cs)
         if (riscv_has_ext(env, RVH)) {
             target_ulong hdeleg = async ? env->hideleg : env->hedeleg;
 
-            if (env->two_stage_lookup && write_tval) {
-                /*
-                 * If we are writing a guest virtual address to stval, set
-                 * this to 1. If we are trapping to VS we will set this to 0
-                 * later.
-                 */
-                env->hstatus = set_field(env->hstatus, HSTATUS_GVA, 1);
-            } else {
-                /* For other HS-mode traps, we set this to 0. */
-                env->hstatus = set_field(env->hstatus, HSTATUS_GVA, 0);
-            }
-
             if (riscv_cpu_virt_enabled(env) && ((hdeleg >> cause) & 1)) {
                 /* Trap to VS mode */
                 /*
@@ -1063,7 +1051,7 @@ void riscv_cpu_do_interrupt(CPUState *cs)
                     cause == IRQ_VS_EXT) {
                     cause = cause - 1;
                 }
-                env->hstatus = set_field(env->hstatus, HSTATUS_GVA, 0);
+                write_gva = false;
             } else if (riscv_cpu_virt_enabled(env)) {
                 /* Trap into HS mode, from virt */
                 riscv_cpu_swap_hypervisor_regs(env);
@@ -1072,6 +1060,7 @@ void riscv_cpu_do_interrupt(CPUState *cs)
                 env->hstatus = set_field(env->hstatus, HSTATUS_SPV,
                                          riscv_cpu_virt_enabled(env));
 
+
                 htval = env->guest_phys_fault_addr;
 
                 riscv_cpu_set_virt_enabled(env, 0);
@@ -1079,7 +1068,9 @@ void riscv_cpu_do_interrupt(CPUState *cs)
                 /* Trap into HS mode */
                 env->hstatus = set_field(env->hstatus, HSTATUS_SPV, false);
                 htval = env->guest_phys_fault_addr;
+                write_gva = false;
             }
+            env->hstatus = set_field(env->hstatus, HSTATUS_GVA, write_gva);
         }
 
         s = env->mstatus;
-- 
2.31.1