include/hw/i386/intel_iommu.h

   1 /*
   2  * QEMU emulation of an Intel IOMMU (VT-d)
   3  *   (DMA Remapping device)
   4  *
   5  * Copyright (C) 2013 Knut Omang, Oracle <knut.omang@oracle.com>
   6  * Copyright (C) 2014 Le Tan, <tamlokveer@gmail.com>
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17
  18  * You should have received a copy of the GNU General Public License along
  19  * with this program; if not, see <http://www.gnu.org/licenses/>.
  20  */
  21
  22 #ifndef INTEL_IOMMU_H
  23 #define INTEL_IOMMU_H
  24 #include "hw/qdev.h"
  25 #include "sysemu/dma.h"
  26
  27 #define TYPE_INTEL_IOMMU_DEVICE "intel-iommu"
  28 #define INTEL_IOMMU_DEVICE(obj) \
  29      OBJECT_CHECK(IntelIOMMUState, (obj), TYPE_INTEL_IOMMU_DEVICE)
  30
  31 /* DMAR Hardware Unit Definition address (IOMMU unit) */
  32 #define Q35_HOST_BRIDGE_IOMMU_ADDR  0xfed90000ULL
  33
  34 #define VTD_PCI_BUS_MAX             256
  35 #define VTD_PCI_SLOT_MAX            32
  36 #define VTD_PCI_FUNC_MAX            8
  37 #define VTD_PCI_DEVFN_MAX           256
  38 #define VTD_PCI_SLOT(devfn)         (((devfn) >> 3) & 0x1f)
  39 #define VTD_PCI_FUNC(devfn)         ((devfn) & 0x07)
  40 #define VTD_SID_TO_BUS(sid)         (((sid) >> 8) & 0xff)
  41 #define VTD_SID_TO_DEVFN(sid)       ((sid) & 0xff)
  42
  43 #define DMAR_REG_SIZE               0x230
  44 #define VTD_HOST_ADDRESS_WIDTH      39
  45 #define VTD_HAW_MASK                ((1ULL << VTD_HOST_ADDRESS_WIDTH) - 1)
  46
  47 typedef struct VTDContextEntry VTDContextEntry;
  48 typedef struct VTDContextCacheEntry VTDContextCacheEntry;
  49 typedef struct IntelIOMMUState IntelIOMMUState;
  50 typedef struct VTDAddressSpace VTDAddressSpace;
  51 typedef struct VTDIOTLBEntry VTDIOTLBEntry;
  52 typedef struct VTDBus VTDBus;
  53
  54 /* Context-Entry */
  55 struct VTDContextEntry {
  56     uint64_t lo;
  57     uint64_t hi;
  58 };
  59
  60 struct VTDContextCacheEntry {
  61     /* The cache entry is obsolete if
  62      * context_cache_gen!=IntelIOMMUState.context_cache_gen
  63      */
  64     uint32_t context_cache_gen;
  65     struct VTDContextEntry context_entry;
  66 };
  67
  68 struct VTDAddressSpace {
  69     PCIBus *bus;
  70     uint8_t devfn;
  71     AddressSpace as;
  72     MemoryRegion iommu;
  73     IntelIOMMUState *iommu_state;
  74     VTDContextCacheEntry context_cache_entry;
  75 };
  76
  77 struct VTDBus {
  78     PCIBus* bus;                /* A reference to the bus to provide translation for */
  79     VTDAddressSpace *dev_as[0]; /* A table of VTDAddressSpace objects indexed by devfn */
  80 };
  81
  82 struct VTDIOTLBEntry {
  83     uint64_t gfn;
  84     uint16_t domain_id;
  85     uint64_t slpte;
  86     bool read_flags;
  87     bool write_flags;
  88 };
  89
  90 /* The iommu (DMAR) device state struct */
  91 struct IntelIOMMUState {
  92     SysBusDevice busdev;
  93     MemoryRegion csrmem;
  94     uint8_t csr[DMAR_REG_SIZE];     /* register values */
  95     uint8_t wmask[DMAR_REG_SIZE];   /* R/W bytes */
  96     uint8_t w1cmask[DMAR_REG_SIZE]; /* RW1C(Write 1 to Clear) bytes */
  97     uint8_t womask[DMAR_REG_SIZE];  /* WO (write only - read returns 0) */
  98     uint32_t version;
  99
 100     dma_addr_t root;                /* Current root table pointer */
 101     bool root_extended;             /* Type of root table (extended or not) */
 102     bool dmar_enabled;              /* Set if DMA remapping is enabled */
 103
 104     uint16_t iq_head;               /* Current invalidation queue head */
 105     uint16_t iq_tail;               /* Current invalidation queue tail */
 106     dma_addr_t iq;                  /* Current invalidation queue pointer */
 107     uint16_t iq_size;               /* IQ Size in number of entries */
 108     bool qi_enabled;                /* Set if the QI is enabled */
 109     uint8_t iq_last_desc_type;      /* The type of last completed descriptor */
 110
 111     /* The index of the Fault Recording Register to be used next.
 112      * Wraps around from N-1 to 0, where N is the number of FRCD_REG.
 113      */
 114     uint16_t next_frcd_reg;
 115
 116     uint64_t cap;                   /* The value of capability reg */
 117     uint64_t ecap;                  /* The value of extended capability reg */
 118
 119     uint32_t context_cache_gen;     /* Should be in [1,MAX] */
 120     GHashTable *iotlb;              /* IOTLB */
 121
 122     MemoryRegionIOMMUOps iommu_ops;
 123     GHashTable *vtd_as_by_busptr;   /* VTDBus objects indexed by PCIBus* reference */
 124     VTDBus *vtd_as_by_bus_num[VTD_PCI_BUS_MAX]; /* VTDBus objects indexed by bus number */
 125 };
 126
 127 /* Find the VTD Address space associated with the given bus pointer,
 128  * create a new one if none exists
 129  */
 130 VTDAddressSpace *vtd_find_add_as(IntelIOMMUState *s, PCIBus *bus, int devfn);
 131
 132 #endif