memory: iommu support
Add a new memory region type that translates addresses it is given,
then forwards them to a target address space. This is similar to
an alias, except that the mapping is more flexible than a linear
translation and trucation, and also less efficient since the
translation happens at runtime.
The implementation uses an AddressSpace mapping the target region to
avoid hierarchical dispatch all the way to the resolved region; only
iommu regions are looked up dynamically.
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Avi Kivity <avi.kivity@gmail.com>
[Modified to put translation in address_space_translate; assume
IOMMUs are not reachable from TCG. - Paolo]
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
diff --git a/include/exec/memory.h b/include/exec/memory.h
index fddc6ad..a5e7721 100644
--- a/include/exec/memory.h
+++ b/include/exec/memory.h
@@ -53,6 +53,24 @@
hwaddr offset;
};
+typedef struct IOMMUTLBEntry IOMMUTLBEntry;
+
+/* See address_space_translate: bit 0 is read, bit 1 is write. */
+typedef enum {
+ IOMMU_NONE = 0,
+ IOMMU_RO = 1,
+ IOMMU_WO = 2,
+ IOMMU_RW = 3,
+} IOMMUAccessFlags;
+
+struct IOMMUTLBEntry {
+ AddressSpace *target_as;
+ hwaddr iova;
+ hwaddr translated_addr;
+ hwaddr addr_mask; /* 0xfff = 4k translation */
+ IOMMUAccessFlags perm;
+};
+
/*
* Memory region callbacks
*/
@@ -115,12 +133,20 @@
const MemoryRegionMmio old_mmio;
};
+typedef struct MemoryRegionIOMMUOps MemoryRegionIOMMUOps;
+
+struct MemoryRegionIOMMUOps {
+ /* Return a TLB entry that contains a given address. */
+ IOMMUTLBEntry (*translate)(MemoryRegion *iommu, hwaddr addr);
+};
+
typedef struct CoalescedMemoryRange CoalescedMemoryRange;
typedef struct MemoryRegionIoeventfd MemoryRegionIoeventfd;
struct MemoryRegion {
/* All fields are private - violators will be prosecuted */
const MemoryRegionOps *ops;
+ const MemoryRegionIOMMUOps *iommu_ops;
void *opaque;
MemoryRegion *parent;
Int128 size;
@@ -332,6 +358,24 @@
void memory_region_init_reservation(MemoryRegion *mr,
const char *name,
uint64_t size);
+
+/**
+ * memory_region_init_iommu: Initialize a memory region that translates
+ * addresses
+ *
+ * An IOMMU region translates addresses and forwards accesses to a target
+ * memory region.
+ *
+ * @mr: the #MemoryRegion to be initialized
+ * @ops: a function that translates addresses into the @target region
+ * @name: used for debugging; not visible to the user or ABI
+ * @size: size of the region.
+ */
+void memory_region_init_iommu(MemoryRegion *mr,
+ const MemoryRegionIOMMUOps *ops,
+ const char *name,
+ uint64_t size);
+
/**
* memory_region_destroy: Destroy a memory region and reclaim all resources.
*
@@ -371,6 +415,15 @@
}
/**
+ * memory_region_is_iommu: check whether a memory region is an iommu
+ *
+ * Returns %true is a memory region is an iommu.
+ *
+ * @mr: the memory region being queried
+ */
+bool memory_region_is_iommu(MemoryRegion *mr);
+
+/**
* memory_region_name: get a memory region's name
*
* Returns the string that was used to initialize the memory region.
@@ -825,7 +878,8 @@
/**
* address_space_rw: read from or write to an address space.
*
- * Return true if the operation hit any unassigned memory.
+ * Return true if the operation hit any unassigned memory or encountered an
+ * IOMMU fault.
*
* @as: #AddressSpace to be accessed
* @addr: address within that address space
@@ -838,7 +892,8 @@
/**
* address_space_write: write to address space.
*
- * Return true if the operation hit any unassigned memory.
+ * Return true if the operation hit any unassigned memory or encountered an
+ * IOMMU fault.
*
* @as: #AddressSpace to be accessed
* @addr: address within that address space
@@ -850,7 +905,8 @@
/**
* address_space_read: read from an address space.
*
- * Return true if the operation hit any unassigned memory.
+ * Return true if the operation hit any unassigned memory or encountered an
+ * IOMMU fault.
*
* @as: #AddressSpace to be accessed
* @addr: address within that address space
@@ -875,7 +931,9 @@
/* address_space_access_valid: check for validity of accessing an address
* space range
*
- * Check whether memory is assigned to the given address space range.
+ * Check whether memory is assigned to the given address space range, and
+ * access is permitted by any IOMMU regions that are active for the address
+ * space.
*
* For now, addr and len should be aligned to a page size. This limitation
* will be lifted in the future.
