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

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.yu@linux.alibaba.com>
Reviewed-by: Daniel Henrique Barboza <daniel.barboza@oss.qualcomm.com>
Reviewed-by: Nutty Liu <nutty.liu@hotmail.com>
Message-ID: <20260509074941.99295-1-fangyu.yu@linux.alibaba.com>
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>

diff --git a/hw/riscv/riscv-iommu-hpm.c b/hw/riscv/riscv-iommu-hpm.c
index e8d284ac8b54d53a5cb7f64b0f30d7e8a31abbf1..5bf80a8db9378fb90ffde1e5bce44280e3bfd143 100644 (file)
--- 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;
     }