[RFC PATCH 09/20] Memory: introduce iommu_ops->record_device

Liu, Yi L
2017-04-26T10:24:12Z

With vIOMMU exposed to guest, vIOMMU emulator needs to do translation
between host and guest. e.g. a device-selective TLB flush, vIOMMU
emulator needs to replace guest SID with host SID so that to limit
the invalidation. This patch introduces a new callback
iommu_ops->record_device() to notify vIOMMU emulator to record necessary
information about the assigned device.

Signed-off-by: Liu, Yi L <yi.l.liu@linux.intel.com>
---
include/exec/memory.h | 11 +++++++++++
memory.c | 12 ++++++++++++
2 files changed, 23 insertions(+)

diff --git a/include/exec/memory.h b/include/exec/memory.h
index 7bd13ab..49087ef 100644
--- a/include/exec/memory.h
+++ b/include/exec/memory.h
@@ -203,6 +203,8 @@ struct MemoryRegionIOMMUOps {
IOMMUNotifierFlag new_flags);
/* Set this up to provide customized IOMMU replay function */
void (*replay)(MemoryRegion *iommu, IOMMUNotifier *notifier);
+ void (*record_device)(MemoryRegion *iommu,
+ void *device_info);
};

typedef struct CoalescedMemoryRange CoalescedMemoryRange;
@@ -708,6 +710,15 @@ void memory_region_notify_iommu(MemoryRegion *mr,
void memory_region_notify_one(IOMMUNotifier *notifier,
IOMMUTLBEntry *entry);

+/*
+ * memory_region_notify_device_record: notify IOMMU to record assign
+ * device.
+ * @mr: the memory region to notify
+ * @ device_info: device information
+ */
+void memory_region_notify_device_record(MemoryRegion *mr,
+ void *info);
+
/**
* memory_region_register_iommu_notifier: register a notifier for changes to
* IOMMU translation entries.
diff --git a/memory.c b/memory.c
index 0728e62..45ef069 100644
--- a/memory.c
+++ b/memory.c
@@ -1600,6 +1600,18 @@ static void memory_region_update_iommu_notify_flags(MemoryRegion *mr)
mr->iommu_notify_flags = flags;
}

+void memory_region_notify_device_record(MemoryRegion *mr,
+ void *info)
+{
+ assert(memory_region_is_iommu(mr));
+
+ if (mr->iommu_ops->record_device) {
+ mr->iommu_ops->record_device(mr, info);
+ }
+
+ return;
+}
+
void memory_region_register_iommu_notifier(MemoryRegion *mr,
IOMMUNotifier *n)
{
--
1.9.1