[PATCH] hw/riscv/riscv-iommu: Fix PPN field of Translation-reponse register

["Nutty Liu" <liujingqi@lanxincomputing.com>]

The original implementation incorrectly performed a bitwise AND
operation between the PPN of iova and PPN Mask, leading to an
incorrect PPN field in Translation-reponse register.

The PPN of iova should be set entirely in the PPN field of
Translation-reponse register.

Signed-off-by: Nutty Liu <liujingqi@lanxincomputing.com>
---
 hw/riscv/riscv-iommu.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/hw/riscv/riscv-iommu.c b/hw/riscv/riscv-iommu.c
index a877e5da84..f529a6a3d7 100644
--- a/hw/riscv/riscv-iommu.c
+++ b/hw/riscv/riscv-iommu.c
@@ -1935,8 +1935,7 @@ static void riscv_iommu_process_dbg(RISCVIOMMUState *s)
             iova = RISCV_IOMMU_TR_RESPONSE_FAULT | (((uint64_t) fault) << 10);
         } else {
             iova = iotlb.translated_addr & ~iotlb.addr_mask;
-            iova >>= TARGET_PAGE_BITS;
-            iova &= RISCV_IOMMU_TR_RESPONSE_PPN;
+            iova = set_field(0, RISCV_IOMMU_TR_RESPONSE_PPN, PPN_DOWN(iova));
 
             /* We do not support superpages (> 4kbs) for now */
             iova &= ~RISCV_IOMMU_TR_RESPONSE_S;
-- 
2.49.0.windows.1