[PATCH 1/2] hw/riscv/riscv-iommu-hpm: Fix irq_overflow_left residual value bug

[Jay Chang <jay.chang@sifive.com>]

Reset irq_overflow_left to 0 before setting up a new timer. Without
this fix, a stale irq_overflow_left value from a previous timer setup
could cause incorrect timer behavior.

Signed-off-by: Jay Chang <jay.chang@sifive.com>
Reviewed-by: Frank Chang <frank.chang@sifive.com>
---
 hw/riscv/riscv-iommu-hpm.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/hw/riscv/riscv-iommu-hpm.c b/hw/riscv/riscv-iommu-hpm.c
index c5034bff79..e8d284ac8b 100644
--- a/hw/riscv/riscv-iommu-hpm.c
+++ b/hw/riscv/riscv-iommu-hpm.c
@@ -228,6 +228,7 @@ static void hpm_setup_timer(RISCVIOMMUState *s, uint64_t value)
     }
 
     overflow_at = (uint64_t)qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + overflow_ns;
+    s->irq_overflow_left = 0;
 
     if (overflow_at > INT64_MAX) {
         s->irq_overflow_left = overflow_at - INT64_MAX;
-- 
2.48.1