xref: /openbmc/qemu/include/hw/i386/intel_iommu.h (revision 4d62d15b)
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 
25 #include "hw/i386/x86-iommu.h"
26 #include "qemu/iova-tree.h"
27 #include "qom/object.h"
28 
29 #define TYPE_INTEL_IOMMU_DEVICE "intel-iommu"
30 OBJECT_DECLARE_SIMPLE_TYPE(IntelIOMMUState, INTEL_IOMMU_DEVICE)
31 
32 #define TYPE_INTEL_IOMMU_MEMORY_REGION "intel-iommu-iommu-memory-region"
33 
34 /* DMAR Hardware Unit Definition address (IOMMU unit) */
35 #define Q35_HOST_BRIDGE_IOMMU_ADDR  0xfed90000ULL
36 
37 #define VTD_PCI_BUS_MAX             256
38 #define VTD_PCI_SLOT_MAX            32
39 #define VTD_PCI_FUNC_MAX            8
40 #define VTD_PCI_SLOT(devfn)         (((devfn) >> 3) & 0x1f)
41 #define VTD_PCI_FUNC(devfn)         ((devfn) & 0x07)
42 #define VTD_SID_TO_BUS(sid)         (((sid) >> 8) & 0xff)
43 #define VTD_SID_TO_DEVFN(sid)       ((sid) & 0xff)
44 
45 #define DMAR_REG_SIZE               0x230
46 #define VTD_HOST_AW_39BIT           39
47 #define VTD_HOST_AW_48BIT           48
48 #define VTD_HOST_ADDRESS_WIDTH      VTD_HOST_AW_39BIT
49 #define VTD_HAW_MASK(aw)            ((1ULL << (aw)) - 1)
50 
51 #define DMAR_REPORT_F_INTR          (1)
52 
53 #define  VTD_MSI_ADDR_HI_MASK        (0xffffffff00000000ULL)
54 #define  VTD_MSI_ADDR_HI_SHIFT       (32)
55 #define  VTD_MSI_ADDR_LO_MASK        (0x00000000ffffffffULL)
56 
57 typedef struct VTDContextEntry VTDContextEntry;
58 typedef struct VTDContextCacheEntry VTDContextCacheEntry;
59 typedef struct VTDAddressSpace VTDAddressSpace;
60 typedef struct VTDIOTLBEntry VTDIOTLBEntry;
61 typedef union VTD_IR_TableEntry VTD_IR_TableEntry;
62 typedef union VTD_IR_MSIAddress VTD_IR_MSIAddress;
63 typedef struct VTDPASIDDirEntry VTDPASIDDirEntry;
64 typedef struct VTDPASIDEntry VTDPASIDEntry;
65 
66 /* Context-Entry */
67 struct VTDContextEntry {
68     union {
69         struct {
70             uint64_t lo;
71             uint64_t hi;
72         };
73         struct {
74             uint64_t val[4];
75         };
76     };
77 };
78 
79 struct VTDContextCacheEntry {
80     /* The cache entry is obsolete if
81      * context_cache_gen!=IntelIOMMUState.context_cache_gen
82      */
83     uint32_t context_cache_gen;
84     struct VTDContextEntry context_entry;
85 };
86 
87 /* PASID Directory Entry */
88 struct VTDPASIDDirEntry {
89     uint64_t val;
90 };
91 
92 /* PASID Table Entry */
93 struct VTDPASIDEntry {
94     uint64_t val[8];
95 };
96 
97 struct VTDAddressSpace {
98     PCIBus *bus;
99     uint8_t devfn;
100     uint32_t pasid;
101     AddressSpace as;
102     IOMMUMemoryRegion iommu;
103     MemoryRegion root;          /* The root container of the device */
104     MemoryRegion nodmar;        /* The alias of shared nodmar MR */
105     MemoryRegion iommu_ir;      /* Interrupt region: 0xfeeXXXXX */
106     MemoryRegion iommu_ir_fault; /* Interrupt region for catching fault */
107     IntelIOMMUState *iommu_state;
108     VTDContextCacheEntry context_cache_entry;
109     QLIST_ENTRY(VTDAddressSpace) next;
110     /* Superset of notifier flags that this address space has */
111     IOMMUNotifierFlag notifier_flags;
112     /*
113      * @iova_tree traces mapped IOVA ranges.
114      *
115      * The tree is not needed if no MAP notifier is registered with current
116      * VTD address space, because all guest invalidate commands can be
117      * directly passed to the IOMMU UNMAP notifiers without any further
118      * reshuffling.
119      *
120      * The tree OTOH is required for MAP typed iommu notifiers for a few
121      * reasons.
122      *
123      * Firstly, there's no way to identify whether an PSI (Page Selective
124      * Invalidations) or DSI (Domain Selective Invalidations) event is an
125      * MAP or UNMAP event within the message itself.  Without having prior
126      * knowledge of existing state vIOMMU doesn't know whether it should
127      * notify MAP or UNMAP for a PSI message it received when caching mode
128      * is enabled (for MAP notifiers).
129      *
130      * Secondly, PSI messages received from guest driver can be enlarged in
131      * range, covers but not limited to what the guest driver wanted to
132      * invalidate.  When the range to invalidates gets bigger than the
133      * limit of a PSI message, it can even become a DSI which will
134      * invalidate the whole domain.  If the vIOMMU directly notifies the
135      * registered device with the unmodified range, it may confuse the
136      * registered drivers (e.g. vfio-pci) on either:
137      *
138      *   (1) Trying to map the same region more than once (for
139      *       VFIO_IOMMU_MAP_DMA, -EEXIST will trigger), or,
140      *
141      *   (2) Trying to UNMAP a range that is still partially mapped.
142      *
143      * That accuracy is not required for UNMAP-only notifiers, but it is a
144      * must-to-have for notifiers registered with MAP events, because the
145      * vIOMMU needs to make sure the shadow page table is always in sync
146      * with the guest IOMMU pgtables for a device.
147      */
148     IOVATree *iova_tree;
149 };
150 
151 struct VTDIOTLBEntry {
152     uint64_t gfn;
153     uint16_t domain_id;
154     uint32_t pasid;
155     uint64_t slpte;
156     uint64_t mask;
157     uint8_t access_flags;
158 };
159 
160 /* VT-d Source-ID Qualifier types */
161 enum {
162     VTD_SQ_FULL = 0x00,     /* Full SID verification */
163     VTD_SQ_IGN_3 = 0x01,    /* Ignore bit 3 */
164     VTD_SQ_IGN_2_3 = 0x02,  /* Ignore bits 2 & 3 */
165     VTD_SQ_IGN_1_3 = 0x03,  /* Ignore bits 1-3 */
166     VTD_SQ_MAX,
167 };
168 
169 /* VT-d Source Validation Types */
170 enum {
171     VTD_SVT_NONE = 0x00,    /* No validation */
172     VTD_SVT_ALL = 0x01,     /* Do full validation */
173     VTD_SVT_BUS = 0x02,     /* Validate bus range */
174     VTD_SVT_MAX,
175 };
176 
177 /* Interrupt Remapping Table Entry Definition */
178 union VTD_IR_TableEntry {
179     struct {
180 #if HOST_BIG_ENDIAN
181         uint64_t dest_id:32;         /* Destination ID */
182         uint64_t __reserved_1:8;     /* Reserved 1 */
183         uint64_t vector:8;           /* Interrupt Vector */
184         uint64_t irte_mode:1;        /* IRTE Mode */
185         uint64_t __reserved_0:3;     /* Reserved 0 */
186         uint64_t __avail:4;          /* Available spaces for software */
187         uint64_t delivery_mode:3;    /* Delivery Mode */
188         uint64_t trigger_mode:1;     /* Trigger Mode */
189         uint64_t redir_hint:1;       /* Redirection Hint */
190         uint64_t dest_mode:1;        /* Destination Mode */
191         uint64_t fault_disable:1;    /* Fault Processing Disable */
192         uint64_t present:1;          /* Whether entry present/available */
193 #else
194         uint64_t present:1;          /* Whether entry present/available */
195         uint64_t fault_disable:1;    /* Fault Processing Disable */
196         uint64_t dest_mode:1;        /* Destination Mode */
197         uint64_t redir_hint:1;       /* Redirection Hint */
198         uint64_t trigger_mode:1;     /* Trigger Mode */
199         uint64_t delivery_mode:3;    /* Delivery Mode */
200         uint64_t __avail:4;          /* Available spaces for software */
201         uint64_t __reserved_0:3;     /* Reserved 0 */
202         uint64_t irte_mode:1;        /* IRTE Mode */
203         uint64_t vector:8;           /* Interrupt Vector */
204         uint64_t __reserved_1:8;     /* Reserved 1 */
205         uint64_t dest_id:32;         /* Destination ID */
206 #endif
207 #if HOST_BIG_ENDIAN
208         uint64_t __reserved_2:44;    /* Reserved 2 */
209         uint64_t sid_vtype:2;        /* Source-ID Validation Type */
210         uint64_t sid_q:2;            /* Source-ID Qualifier */
211         uint64_t source_id:16;       /* Source-ID */
212 #else
213         uint64_t source_id:16;       /* Source-ID */
214         uint64_t sid_q:2;            /* Source-ID Qualifier */
215         uint64_t sid_vtype:2;        /* Source-ID Validation Type */
216         uint64_t __reserved_2:44;    /* Reserved 2 */
217 #endif
218     } QEMU_PACKED irte;
219     uint64_t data[2];
220 };
221 
222 #define VTD_IR_INT_FORMAT_COMPAT     (0) /* Compatible Interrupt */
223 #define VTD_IR_INT_FORMAT_REMAP      (1) /* Remappable Interrupt */
224 
225 /* Programming format for MSI/MSI-X addresses */
226 union VTD_IR_MSIAddress {
227     struct {
228 #if HOST_BIG_ENDIAN
229         uint32_t __head:12;          /* Should always be: 0x0fee */
230         uint32_t index_l:15;         /* Interrupt index bit 14-0 */
231         uint32_t int_mode:1;         /* Interrupt format */
232         uint32_t sub_valid:1;        /* SHV: Sub-Handle Valid bit */
233         uint32_t index_h:1;          /* Interrupt index bit 15 */
234         uint32_t __not_care:2;
235 #else
236         uint32_t __not_care:2;
237         uint32_t index_h:1;          /* Interrupt index bit 15 */
238         uint32_t sub_valid:1;        /* SHV: Sub-Handle Valid bit */
239         uint32_t int_mode:1;         /* Interrupt format */
240         uint32_t index_l:15;         /* Interrupt index bit 14-0 */
241         uint32_t __head:12;          /* Should always be: 0x0fee */
242 #endif
243     } QEMU_PACKED addr;
244     uint32_t data;
245 };
246 
247 /* When IR is enabled, all MSI/MSI-X data bits should be zero */
248 #define VTD_IR_MSI_DATA          (0)
249 
250 /* The iommu (DMAR) device state struct */
251 struct IntelIOMMUState {
252     X86IOMMUState x86_iommu;
253     MemoryRegion csrmem;
254     MemoryRegion mr_nodmar;
255     MemoryRegion mr_ir;
256     MemoryRegion mr_sys_alias;
257     uint8_t csr[DMAR_REG_SIZE];     /* register values */
258     uint8_t wmask[DMAR_REG_SIZE];   /* R/W bytes */
259     uint8_t w1cmask[DMAR_REG_SIZE]; /* RW1C(Write 1 to Clear) bytes */
260     uint8_t womask[DMAR_REG_SIZE];  /* WO (write only - read returns 0) */
261     uint32_t version;
262 
263     bool caching_mode;              /* RO - is cap CM enabled? */
264     bool scalable_mode;             /* RO - is Scalable Mode supported? */
265     bool snoop_control;             /* RO - is SNP filed supported? */
266 
267     dma_addr_t root;                /* Current root table pointer */
268     bool root_scalable;             /* Type of root table (scalable or not) */
269     bool dmar_enabled;              /* Set if DMA remapping is enabled */
270 
271     uint16_t iq_head;               /* Current invalidation queue head */
272     uint16_t iq_tail;               /* Current invalidation queue tail */
273     dma_addr_t iq;                  /* Current invalidation queue pointer */
274     uint16_t iq_size;               /* IQ Size in number of entries */
275     bool iq_dw;                     /* IQ descriptor width 256bit or not */
276     bool qi_enabled;                /* Set if the QI is enabled */
277     uint8_t iq_last_desc_type;      /* The type of last completed descriptor */
278 
279     /* The index of the Fault Recording Register to be used next.
280      * Wraps around from N-1 to 0, where N is the number of FRCD_REG.
281      */
282     uint16_t next_frcd_reg;
283 
284     uint64_t cap;                   /* The value of capability reg */
285     uint64_t ecap;                  /* The value of extended capability reg */
286 
287     uint32_t context_cache_gen;     /* Should be in [1,MAX] */
288     GHashTable *iotlb;              /* IOTLB */
289 
290     GHashTable *vtd_address_spaces;             /* VTD address spaces */
291     VTDAddressSpace *vtd_as_cache[VTD_PCI_BUS_MAX]; /* VTD address space cache */
292     /* list of registered notifiers */
293     QLIST_HEAD(, VTDAddressSpace) vtd_as_with_notifiers;
294 
295     GHashTable *vtd_host_iommu_dev;             /* HostIOMMUDevice */
296 
297     /* interrupt remapping */
298     bool intr_enabled;              /* Whether guest enabled IR */
299     dma_addr_t intr_root;           /* Interrupt remapping table pointer */
300     uint32_t intr_size;             /* Number of IR table entries */
301     bool intr_eime;                 /* Extended interrupt mode enabled */
302     OnOffAuto intr_eim;             /* Toggle for EIM cabability */
303     bool buggy_eim;                 /* Force buggy EIM unless eim=off */
304     uint8_t aw_bits;                /* Host/IOVA address width (in bits) */
305     bool dma_drain;                 /* Whether DMA r/w draining enabled */
306     bool dma_translation;           /* Whether DMA translation supported */
307     bool pasid;                     /* Whether to support PASID */
308 
309     /* Transient Mapping, Reserved(0) since VTD spec revision 3.2 */
310     bool stale_tm;
311 
312     /*
313      * Protects IOMMU states in general.  Currently it protects the
314      * per-IOMMU IOTLB cache, and context entry cache in VTDAddressSpace.
315      */
316     QemuMutex iommu_lock;
317 };
318 
319 /* Find the VTD Address space associated with the given bus pointer,
320  * create a new one if none exists
321  */
322 VTDAddressSpace *vtd_find_add_as(IntelIOMMUState *s, PCIBus *bus,
323                                  int devfn, unsigned int pasid);
324 
325 #endif
326