[PATCH] hw/riscv/riscv-iommu: Fix IOCOUNTINH.CY toggle detection

[fangyu . yu]

From: Fangyu Yu <fangyu...@linux.alibaba.com>

Fix IOCOUNTINH.CY toggle detection by comparing normalized CY bit
rather than XORing whole register with boolean.

Fixes: 2cf2a6c027ba ("hw/riscv/riscv-iommu: add IOCOUNTINH mmio writes")
Signed-off-by: Fangyu Yu <fangyu...@linux.alibaba.com>
---
 hw/riscv/riscv-iommu-hpm.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/hw/riscv/riscv-iommu-hpm.c b/hw/riscv/riscv-iommu-hpm.c
index e8d284ac8b..5bf80a8db9 100644
--- a/hw/riscv/riscv-iommu-hpm.c
+++ b/hw/riscv/riscv-iommu-hpm.c
@@ -245,7 +245,8 @@ void riscv_iommu_process_iocntinh_cy(RISCVIOMMUState *s, 
bool prev_cy_inh)
         s, RISCV_IOMMU_REG_IOCOUNTINH);
 
     /* We only need to process CY bit toggle. */
-    if (!(inhibit ^ prev_cy_inh)) {
+    bool cy_inh = !!(inhibit & RISCV_IOMMU_IOCOUNTINH_CY);
+    if (cy_inh == prev_cy_inh) {
         return;
     }
 
-- 
2.50.1