2 * QEMU emulation of an Intel IOMMU (VT-d)
3 * (DMA Remapping device)
5 * Copyright (C) 2013 Knut Omang, Oracle <knut.omang@oracle.com>
6 * Copyright (C) 2014 Le Tan, <tamlokveer@gmail.com>
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.
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.
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/>.
25 #include "sysemu/dma.h"
26 #include "hw/i386/x86-iommu.h"
27 #include "hw/i386/ioapic.h"
28 #include "hw/pci/msi.h"
29 #include "hw/sysbus.h"
30 #include "qemu/iova-tree.h"
32 #define TYPE_INTEL_IOMMU_DEVICE "intel-iommu"
33 #define INTEL_IOMMU_DEVICE(obj) \
34 OBJECT_CHECK(IntelIOMMUState, (obj), TYPE_INTEL_IOMMU_DEVICE)
36 #define TYPE_INTEL_IOMMU_MEMORY_REGION "intel-iommu-iommu-memory-region"
38 /* DMAR Hardware Unit Definition address (IOMMU unit) */
39 #define Q35_HOST_BRIDGE_IOMMU_ADDR 0xfed90000ULL
41 #define VTD_PCI_BUS_MAX 256
42 #define VTD_PCI_SLOT_MAX 32
43 #define VTD_PCI_FUNC_MAX 8
44 #define VTD_PCI_SLOT(devfn) (((devfn) >> 3) & 0x1f)
45 #define VTD_PCI_FUNC(devfn) ((devfn) & 0x07)
46 #define VTD_SID_TO_BUS(sid) (((sid) >> 8) & 0xff)
47 #define VTD_SID_TO_DEVFN(sid) ((sid) & 0xff)
49 #define DMAR_REG_SIZE 0x230
50 #define VTD_HOST_AW_39BIT 39
51 #define VTD_HOST_AW_48BIT 48
52 #define VTD_HOST_ADDRESS_WIDTH VTD_HOST_AW_39BIT
53 #define VTD_HAW_MASK(aw) ((1ULL << (aw)) - 1)
55 #define DMAR_REPORT_F_INTR (1)
57 #define VTD_MSI_ADDR_HI_MASK (0xffffffff00000000ULL)
58 #define VTD_MSI_ADDR_HI_SHIFT (32)
59 #define VTD_MSI_ADDR_LO_MASK (0x00000000ffffffffULL)
61 typedef struct VTDContextEntry VTDContextEntry
;
62 typedef struct VTDContextCacheEntry VTDContextCacheEntry
;
63 typedef struct IntelIOMMUState IntelIOMMUState
;
64 typedef struct VTDAddressSpace VTDAddressSpace
;
65 typedef struct VTDIOTLBEntry VTDIOTLBEntry
;
66 typedef struct VTDBus VTDBus
;
67 typedef union VTD_IR_TableEntry VTD_IR_TableEntry
;
68 typedef union VTD_IR_MSIAddress VTD_IR_MSIAddress
;
71 struct VTDContextEntry
{
76 struct VTDContextCacheEntry
{
77 /* The cache entry is obsolete if
78 * context_cache_gen!=IntelIOMMUState.context_cache_gen
80 uint32_t context_cache_gen
;
81 struct VTDContextEntry context_entry
;
84 struct VTDAddressSpace
{
88 IOMMUMemoryRegion iommu
;
90 MemoryRegion sys_alias
;
91 MemoryRegion iommu_ir
; /* Interrupt region: 0xfeeXXXXX */
92 IntelIOMMUState
*iommu_state
;
93 VTDContextCacheEntry context_cache_entry
;
94 QLIST_ENTRY(VTDAddressSpace
) next
;
95 /* Superset of notifier flags that this address space has */
96 IOMMUNotifierFlag notifier_flags
;
97 IOVATree
*iova_tree
; /* Traces mapped IOVA ranges */
101 PCIBus
* bus
; /* A reference to the bus to provide translation for */
102 VTDAddressSpace
*dev_as
[0]; /* A table of VTDAddressSpace objects indexed by devfn */
105 struct VTDIOTLBEntry
{
110 uint8_t access_flags
;
113 /* VT-d Source-ID Qualifier types */
115 VTD_SQ_FULL
= 0x00, /* Full SID verification */
116 VTD_SQ_IGN_3
= 0x01, /* Ignore bit 3 */
117 VTD_SQ_IGN_2_3
= 0x02, /* Ignore bits 2 & 3 */
118 VTD_SQ_IGN_1_3
= 0x03, /* Ignore bits 1-3 */
122 /* VT-d Source Validation Types */
124 VTD_SVT_NONE
= 0x00, /* No validation */
125 VTD_SVT_ALL
= 0x01, /* Do full validation */
126 VTD_SVT_BUS
= 0x02, /* Validate bus range */
130 /* Interrupt Remapping Table Entry Definition */
131 union VTD_IR_TableEntry
{
133 #ifdef HOST_WORDS_BIGENDIAN
134 uint32_t __reserved_1
:8; /* Reserved 1 */
135 uint32_t vector
:8; /* Interrupt Vector */
136 uint32_t irte_mode
:1; /* IRTE Mode */
137 uint32_t __reserved_0
:3; /* Reserved 0 */
138 uint32_t __avail
:4; /* Available spaces for software */
139 uint32_t delivery_mode
:3; /* Delivery Mode */
140 uint32_t trigger_mode
:1; /* Trigger Mode */
141 uint32_t redir_hint
:1; /* Redirection Hint */
142 uint32_t dest_mode
:1; /* Destination Mode */
143 uint32_t fault_disable
:1; /* Fault Processing Disable */
144 uint32_t present
:1; /* Whether entry present/available */
146 uint32_t present
:1; /* Whether entry present/available */
147 uint32_t fault_disable
:1; /* Fault Processing Disable */
148 uint32_t dest_mode
:1; /* Destination Mode */
149 uint32_t redir_hint
:1; /* Redirection Hint */
150 uint32_t trigger_mode
:1; /* Trigger Mode */
151 uint32_t delivery_mode
:3; /* Delivery Mode */
152 uint32_t __avail
:4; /* Available spaces for software */
153 uint32_t __reserved_0
:3; /* Reserved 0 */
154 uint32_t irte_mode
:1; /* IRTE Mode */
155 uint32_t vector
:8; /* Interrupt Vector */
156 uint32_t __reserved_1
:8; /* Reserved 1 */
158 uint32_t dest_id
; /* Destination ID */
159 uint16_t source_id
; /* Source-ID */
160 #ifdef HOST_WORDS_BIGENDIAN
161 uint64_t __reserved_2
:44; /* Reserved 2 */
162 uint64_t sid_vtype
:2; /* Source-ID Validation Type */
163 uint64_t sid_q
:2; /* Source-ID Qualifier */
165 uint64_t sid_q
:2; /* Source-ID Qualifier */
166 uint64_t sid_vtype
:2; /* Source-ID Validation Type */
167 uint64_t __reserved_2
:44; /* Reserved 2 */
173 #define VTD_IR_INT_FORMAT_COMPAT (0) /* Compatible Interrupt */
174 #define VTD_IR_INT_FORMAT_REMAP (1) /* Remappable Interrupt */
176 /* Programming format for MSI/MSI-X addresses */
177 union VTD_IR_MSIAddress
{
179 #ifdef HOST_WORDS_BIGENDIAN
180 uint32_t __head
:12; /* Should always be: 0x0fee */
181 uint32_t index_l
:15; /* Interrupt index bit 14-0 */
182 uint32_t int_mode
:1; /* Interrupt format */
183 uint32_t sub_valid
:1; /* SHV: Sub-Handle Valid bit */
184 uint32_t index_h
:1; /* Interrupt index bit 15 */
185 uint32_t __not_care
:2;
187 uint32_t __not_care
:2;
188 uint32_t index_h
:1; /* Interrupt index bit 15 */
189 uint32_t sub_valid
:1; /* SHV: Sub-Handle Valid bit */
190 uint32_t int_mode
:1; /* Interrupt format */
191 uint32_t index_l
:15; /* Interrupt index bit 14-0 */
192 uint32_t __head
:12; /* Should always be: 0x0fee */
198 /* When IR is enabled, all MSI/MSI-X data bits should be zero */
199 #define VTD_IR_MSI_DATA (0)
201 /* The iommu (DMAR) device state struct */
202 struct IntelIOMMUState
{
203 X86IOMMUState x86_iommu
;
205 uint8_t csr
[DMAR_REG_SIZE
]; /* register values */
206 uint8_t wmask
[DMAR_REG_SIZE
]; /* R/W bytes */
207 uint8_t w1cmask
[DMAR_REG_SIZE
]; /* RW1C(Write 1 to Clear) bytes */
208 uint8_t womask
[DMAR_REG_SIZE
]; /* WO (write only - read returns 0) */
211 bool caching_mode
; /* RO - is cap CM enabled? */
213 dma_addr_t root
; /* Current root table pointer */
214 bool root_extended
; /* Type of root table (extended or not) */
215 bool dmar_enabled
; /* Set if DMA remapping is enabled */
217 uint16_t iq_head
; /* Current invalidation queue head */
218 uint16_t iq_tail
; /* Current invalidation queue tail */
219 dma_addr_t iq
; /* Current invalidation queue pointer */
220 uint16_t iq_size
; /* IQ Size in number of entries */
221 bool qi_enabled
; /* Set if the QI is enabled */
222 uint8_t iq_last_desc_type
; /* The type of last completed descriptor */
224 /* The index of the Fault Recording Register to be used next.
225 * Wraps around from N-1 to 0, where N is the number of FRCD_REG.
227 uint16_t next_frcd_reg
;
229 uint64_t cap
; /* The value of capability reg */
230 uint64_t ecap
; /* The value of extended capability reg */
232 uint32_t context_cache_gen
; /* Should be in [1,MAX] */
233 GHashTable
*iotlb
; /* IOTLB */
235 GHashTable
*vtd_as_by_busptr
; /* VTDBus objects indexed by PCIBus* reference */
236 VTDBus
*vtd_as_by_bus_num
[VTD_PCI_BUS_MAX
]; /* VTDBus objects indexed by bus number */
237 /* list of registered notifiers */
238 QLIST_HEAD(, VTDAddressSpace
) vtd_as_with_notifiers
;
240 /* interrupt remapping */
241 bool intr_enabled
; /* Whether guest enabled IR */
242 dma_addr_t intr_root
; /* Interrupt remapping table pointer */
243 uint32_t intr_size
; /* Number of IR table entries */
244 bool intr_eime
; /* Extended interrupt mode enabled */
245 OnOffAuto intr_eim
; /* Toggle for EIM cabability */
246 bool buggy_eim
; /* Force buggy EIM unless eim=off */
247 uint8_t aw_bits
; /* Host/IOVA address width (in bits) */
250 * Protects IOMMU states in general. Currently it protects the
251 * per-IOMMU IOTLB cache, and context entry cache in VTDAddressSpace.
253 QemuMutex iommu_lock
;
256 /* Find the VTD Address space associated with the given bus pointer,
257 * create a new one if none exists
259 VTDAddressSpace
*vtd_find_add_as(IntelIOMMUState
*s
, PCIBus
*bus
, int devfn
);