[PATCH v3 2/4] target/riscv: Don't clear mask in riscv_cpu_update_mip() for VSTIP

[Anup Patel <apatel@ventanamicro.com>]

Instead of clearing mask in riscv_cpu_update_mip() for VSTIP, we
should call riscv_cpu_update_mip() with mask == 0 from timer_helper.c
for VSTIP.

Fixes: 3ec0fe18a31f ("target/riscv: Add vstimecmp suppor")
Signed-off-by: Anup Patel <apatel@ventanamicro.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
---
 target/riscv/cpu_helper.c  |  2 --
 target/riscv/time_helper.c | 12 ++++++++----
 2 files changed, 8 insertions(+), 6 deletions(-)

diff --git a/target/riscv/cpu_helper.c b/target/riscv/cpu_helper.c
index 8ea3442b4a..84f84b2bae 100644
--- a/target/riscv/cpu_helper.c
+++ b/target/riscv/cpu_helper.c
@@ -621,8 +621,6 @@ uint64_t riscv_cpu_update_mip(RISCVCPU *cpu, uint64_t mask, uint64_t value)
         vsgein = (env->hgeip & (1ULL << gein)) ? MIP_VSEIP : 0;
     }
 
-    /* No need to update mip for VSTIP */
-    mask = ((mask == MIP_VSTIP) && env->vstime_irq) ? 0 : mask;
     vstip = env->vstime_irq ? MIP_VSTIP : 0;
 
     QEMU_IOTHREAD_LOCK_GUARD();
diff --git a/target/riscv/time_helper.c b/target/riscv/time_helper.c
index 8cce667dfd..4fb2a471a9 100644
--- a/target/riscv/time_helper.c
+++ b/target/riscv/time_helper.c
@@ -27,7 +27,7 @@ static void riscv_vstimer_cb(void *opaque)
     RISCVCPU *cpu = opaque;
     CPURISCVState *env = &cpu->env;
     env->vstime_irq = 1;
-    riscv_cpu_update_mip(cpu, MIP_VSTIP, BOOL_TO_MASK(1));
+    riscv_cpu_update_mip(cpu, 0, BOOL_TO_MASK(1));
 }
 
 static void riscv_stimer_cb(void *opaque)
@@ -57,16 +57,20 @@ void riscv_timer_write_timecmp(RISCVCPU *cpu, QEMUTimer *timer,
          */
         if (timer_irq == MIP_VSTIP) {
             env->vstime_irq = 1;
+            riscv_cpu_update_mip(cpu, 0, BOOL_TO_MASK(1));
+        } else {
+            riscv_cpu_update_mip(cpu, MIP_STIP, BOOL_TO_MASK(1));
         }
-        riscv_cpu_update_mip(cpu, timer_irq, BOOL_TO_MASK(1));
         return;
     }
 
+    /* Clear the [VS|S]TIP bit in mip */
     if (timer_irq == MIP_VSTIP) {
         env->vstime_irq = 0;
+        riscv_cpu_update_mip(cpu, 0, BOOL_TO_MASK(0));
+    } else {
+        riscv_cpu_update_mip(cpu, timer_irq, BOOL_TO_MASK(0));
     }
-    /* Clear the [V]STIP bit in mip */
-    riscv_cpu_update_mip(cpu, timer_irq, BOOL_TO_MASK(0));
 
     /* otherwise, set up the future timer interrupt */
     diff = timecmp - rtc_r;
-- 
2.34.1