intel-iommu: add IOTLB using hash table

Add IOTLB to cache information about the translation of input-addresses. IOTLB
use a GHashTable as cache. The key of the hash table is the logical-OR of gfn
and source id after left-shifting.

Signed-off-by: Le Tan <tamlokveer@gmail.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

1 files changed, 10 insertions, 1 deletions

diff --git a/include/hw/i386/intel_iommu.h b/include/hw/i386/intel_iommu.h
index d9a5215..f4701e1 100644
--- a/include/hw/i386/intel_iommu.h
+++ b/include/hw/i386/intel_iommu.h
@@ -48,7 +48,7 @@ typedef struct VTDContextEntry VTDContextEntry;
 typedef struct VTDContextCacheEntry VTDContextCacheEntry;
 typedef struct IntelIOMMUState IntelIOMMUState;
 typedef struct VTDAddressSpace VTDAddressSpace;
-
+typedef struct VTDIOTLBEntry VTDIOTLBEntry;
 
 /* Context-Entry */
 struct VTDContextEntry {
@@ -73,6 +73,14 @@ struct VTDAddressSpace {
     VTDContextCacheEntry context_cache_entry;
 };
 
+struct VTDIOTLBEntry {
+    uint64_t gfn;
+    uint16_t domain_id;
+    uint64_t slpte;
+    bool read_flags;
+    bool write_flags;
+};
+
 /* The iommu (DMAR) device state struct */
 struct IntelIOMMUState {
     SysBusDevice busdev;
@@ -103,6 +111,7 @@ struct IntelIOMMUState {
     uint64_t ecap;                  /* The value of extended capability reg */
 
     uint32_t context_cache_gen;     /* Should be in [1,MAX] */
+    GHashTable *iotlb;              /* IOTLB */
 
     MemoryRegionIOMMUOps iommu_ops;
     VTDAddressSpace **address_spaces[VTD_PCI_BUS_MAX];