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-rw-r--r--hw/arm/smmu-common.c2
-rw-r--r--include/hw/arm/smmu-common.h1
2 files changed, 2 insertions, 1 deletions
diff --git a/hw/arm/smmu-common.c b/hw/arm/smmu-common.c
index 3098915..55c75d6 100644
--- a/hw/arm/smmu-common.c
+++ b/hw/arm/smmu-common.c
@@ -351,7 +351,7 @@ IOMMUMemoryRegion *smmu_iommu_mr(SMMUState *s, uint32_t sid)
bus_n = PCI_BUS_NUM(sid);
smmu_bus = smmu_find_smmu_pcibus(s, bus_n);
if (smmu_bus) {
- devfn = sid & 0x7;
+ devfn = SMMU_PCI_DEVFN(sid);
smmu = smmu_bus->pbdev[devfn];
if (smmu) {
return &smmu->iommu;
diff --git a/include/hw/arm/smmu-common.h b/include/hw/arm/smmu-common.h
index 50e2912..b07cadd 100644
--- a/include/hw/arm/smmu-common.h
+++ b/include/hw/arm/smmu-common.h
@@ -24,6 +24,7 @@
#define SMMU_PCI_BUS_MAX 256
#define SMMU_PCI_DEVFN_MAX 256
+#define SMMU_PCI_DEVFN(sid) (sid & 0xFF)
#define SMMU_MAX_VA_BITS 48