[Qemu-devel] [PATCH v2 2/2] spapr_iommu: translate sPAPRTCEAccess to IOMMUAccessFlags

[Greg Kurz]

The fact that these enums have matching values is pure coincidence. We
actually need to translate from the PAPR definition to the QEMU one.

This patch doesn't fix any bug, it is only code cleanup.

Suggested-by: Alexey Kardashevskiy <address@hidden>
Signed-off-by: Greg Kurz <address@hidden>
---
 hw/ppc/spapr_iommu.c |   18 ++++++++++++++++--
 1 file changed, 16 insertions(+), 2 deletions(-)

diff --git a/hw/ppc/spapr_iommu.c b/hw/ppc/spapr_iommu.c
index ddd0ea5cd4dd..9133912bb983 100644
--- a/hw/ppc/spapr_iommu.c
+++ b/hw/ppc/spapr_iommu.c
@@ -60,6 +60,20 @@ sPAPRTCETable *spapr_tce_find_by_liobn(target_ulong liobn)
     return NULL;
 }
 
+static IOMMUAccessFlags spapr_tce_iommu_access_flags(uint64_t tce)
+{
+    switch (tce & SPAPR_TCE_RW) {
+    case SPAPR_TCE_FAULT:
+        return IOMMU_NONE;
+    case SPAPR_TCE_RO:
+        return IOMMU_RO;
+    case SPAPR_TCE_WO:
+        return IOMMU_WO;
+    default: /* SPAPR_TCE_RW */
+        return IOMMU_RW;
+    }
+}
+
 /* Called from RCU critical section */
 static IOMMUTLBEntry spapr_tce_translate_iommu(MemoryRegion *iommu, hwaddr 
addr,
                                                bool is_write)
@@ -82,7 +96,7 @@ static IOMMUTLBEntry spapr_tce_translate_iommu(MemoryRegion 
*iommu, hwaddr addr,
         ret.iova = addr & page_mask;
         ret.translated_addr = tce & page_mask;
         ret.addr_mask = ~page_mask;
-        ret.perm = tce & IOMMU_RW;
+        ret.perm = spapr_tce_iommu_access_flags(tce);
     }
     trace_spapr_iommu_xlate(tcet->liobn, addr, ret.iova, ret.perm,
                             ret.addr_mask);
@@ -233,7 +247,7 @@ static target_ulong put_tce_emu(sPAPRTCETable *tcet, 
target_ulong ioba,
     entry.iova = ioba & page_mask;
     entry.translated_addr = tce & page_mask;
     entry.addr_mask = ~page_mask;
-    entry.perm = tce & IOMMU_RW;
+    entry.perm = spapr_tce_iommu_access_flags(tce);
     memory_region_notify_iommu(&tcet->iommu, entry);
 
     return H_SUCCESS;