@@ -104,6 +104,13 @@ static IOMMUTLBEntry spapr_tce_translate_iommu(MemoryRegion *iommu, hwaddr addr,
return ret;
}
+static uint64_t spapr_tce_get_page_sizes(MemoryRegion *iommu)
+{
+ sPAPRTCETable *tcet = container_of(iommu, sPAPRTCETable, iommu);
+
+ return 1ULL << tcet->page_shift;
+}
+
static int spapr_tce_table_post_load(void *opaque, int version_id)
{
sPAPRTCETable *tcet = SPAPR_TCE_TABLE(opaque);
@@ -135,6 +142,7 @@ static const VMStateDescription vmstate_spapr_tce_table = {
static MemoryRegionIOMMUOps spapr_iommu_ops = {
.translate = spapr_tce_translate_iommu,
+ .get_page_sizes = spapr_tce_get_page_sizes,
};
static int spapr_tce_table_realize(DeviceState *dev)
@@ -150,6 +150,8 @@ struct MemoryRegionOps {
typedef struct MemoryRegionIOMMUOps MemoryRegionIOMMUOps;
struct MemoryRegionIOMMUOps {
+ /* Returns supported page sizes */
+ uint64_t (*get_page_sizes)(MemoryRegion *iommu);
/* Return a TLB entry that contains a given address. */
IOMMUTLBEntry (*translate)(MemoryRegion *iommu, hwaddr addr, bool is_write);
};
@@ -552,6 +554,15 @@ static inline bool memory_region_is_romd(MemoryRegion *mr)
bool memory_region_is_iommu(MemoryRegion *mr);
/**
+ * memory_region_iommu_get_page_sizes: get supported page sizes in an iommu
+ *
+ * Returns %bitmap of supported page sizes for an iommu.
+ *
+ * @mr: the memory region being queried
+ */
+uint64_t memory_region_iommu_get_page_sizes(MemoryRegion *mr);
+
+/**
* memory_region_notify_iommu: notify a change in an IOMMU translation entry.
*
* @mr: the memory region that was changed
@@ -1413,6 +1413,15 @@ bool memory_region_is_iommu(MemoryRegion *mr)
return mr->iommu_ops;
}
+uint64_t memory_region_iommu_get_page_sizes(MemoryRegion *mr)
+{
+ assert(memory_region_is_iommu(mr));
+ if (mr->iommu_ops && mr->iommu_ops->get_page_sizes) {
+ return mr->iommu_ops->get_page_sizes(mr);
+ }
+ return qemu_real_host_page_size;
+}
+
void memory_region_register_iommu_notifier(MemoryRegion *mr, Notifier *n)
{
notifier_list_add(&mr->iommu_notify, n);
Every IOMMU has some granularity which MemoryRegionIOMMUOps::translate uses when translating, however this information is not available outside the translate context for various checks. This adds a get_page_sizes callback to MemoryRegionIOMMUOps and a wrapper for it so IOMMU users (such as VFIO) can know the actual page size(s) used by an IOMMU. The qemu_real_host_page_mask is used as fallback. Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru> --- Changes: v4: * s/1<<TARGET_PAGE_BITS/qemu_real_host_page_size/ --- hw/ppc/spapr_iommu.c | 8 ++++++++ include/exec/memory.h | 11 +++++++++++ memory.c | 9 +++++++++ 3 files changed, 28 insertions(+)