4 * Copyright (C) 2015,2016 ARM Ltd.
5 * Author: Andre Przywara <andre.przywara@arm.com>
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program. If not, see <http://www.gnu.org/licenses/>.
20 #include <linux/cpu.h>
21 #include <linux/kvm.h>
22 #include <linux/kvm_host.h>
23 #include <linux/interrupt.h>
24 #include <linux/list.h>
25 #include <linux/uaccess.h>
27 #include <linux/irqchip/arm-gic-v3.h>
29 #include <asm/kvm_emulate.h>
30 #include <asm/kvm_arm.h>
31 #include <asm/kvm_mmu.h>
34 #include "vgic-mmio.h"
37 * Creates a new (reference to a) struct vgic_irq for a given LPI.
38 * If this LPI is already mapped on another ITS, we increase its refcount
39 * and return a pointer to the existing structure.
40 * If this is a "new" LPI, we allocate and initialize a new struct vgic_irq.
41 * This function returns a pointer to the _unlocked_ structure.
43 static struct vgic_irq
*vgic_add_lpi(struct kvm
*kvm
, u32 intid
)
45 struct vgic_dist
*dist
= &kvm
->arch
.vgic
;
46 struct vgic_irq
*irq
= vgic_get_irq(kvm
, NULL
, intid
), *oldirq
;
48 /* In this case there is no put, since we keep the reference. */
52 irq
= kzalloc(sizeof(struct vgic_irq
), GFP_KERNEL
);
56 INIT_LIST_HEAD(&irq
->lpi_list
);
57 INIT_LIST_HEAD(&irq
->ap_list
);
58 spin_lock_init(&irq
->irq_lock
);
60 irq
->config
= VGIC_CONFIG_EDGE
;
61 kref_init(&irq
->refcount
);
64 spin_lock(&dist
->lpi_list_lock
);
67 * There could be a race with another vgic_add_lpi(), so we need to
68 * check that we don't add a second list entry with the same LPI.
70 list_for_each_entry(oldirq
, &dist
->lpi_list_head
, lpi_list
) {
71 if (oldirq
->intid
!= intid
)
74 /* Someone was faster with adding this LPI, lets use that. */
79 * This increases the refcount, the caller is expected to
80 * call vgic_put_irq() on the returned pointer once it's
81 * finished with the IRQ.
83 kref_get(&irq
->refcount
);
88 list_add_tail(&irq
->lpi_list
, &dist
->lpi_list_head
);
89 dist
->lpi_list_count
++;
92 spin_unlock(&dist
->lpi_list_lock
);
98 struct list_head dev_list
;
100 /* the head for the list of ITTEs */
101 struct list_head itt_head
;
105 #define COLLECTION_NOT_MAPPED ((u32)~0)
107 struct its_collection
{
108 struct list_head coll_list
;
114 #define its_is_collection_mapped(coll) ((coll) && \
115 ((coll)->target_addr != COLLECTION_NOT_MAPPED))
118 struct list_head itte_list
;
120 struct vgic_irq
*irq
;
121 struct its_collection
*collection
;
127 * Find and returns a device in the device table for an ITS.
128 * Must be called with the its_lock mutex held.
130 static struct its_device
*find_its_device(struct vgic_its
*its
, u32 device_id
)
132 struct its_device
*device
;
134 list_for_each_entry(device
, &its
->device_list
, dev_list
)
135 if (device_id
== device
->device_id
)
142 * Find and returns an interrupt translation table entry (ITTE) for a given
143 * Device ID/Event ID pair on an ITS.
144 * Must be called with the its_lock mutex held.
146 static struct its_itte
*find_itte(struct vgic_its
*its
, u32 device_id
,
149 struct its_device
*device
;
150 struct its_itte
*itte
;
152 device
= find_its_device(its
, device_id
);
156 list_for_each_entry(itte
, &device
->itt_head
, itte_list
)
157 if (itte
->event_id
== event_id
)
163 /* To be used as an iterator this macro misses the enclosing parentheses */
164 #define for_each_lpi_its(dev, itte, its) \
165 list_for_each_entry(dev, &(its)->device_list, dev_list) \
166 list_for_each_entry(itte, &(dev)->itt_head, itte_list)
169 * We only implement 48 bits of PA at the moment, although the ITS
170 * supports more. Let's be restrictive here.
172 #define BASER_ADDRESS(x) ((x) & GENMASK_ULL(47, 16))
173 #define CBASER_ADDRESS(x) ((x) & GENMASK_ULL(47, 12))
174 #define PENDBASER_ADDRESS(x) ((x) & GENMASK_ULL(47, 16))
175 #define PROPBASER_ADDRESS(x) ((x) & GENMASK_ULL(47, 12))
177 #define GIC_LPI_OFFSET 8192
180 * Finds and returns a collection in the ITS collection table.
181 * Must be called with the its_lock mutex held.
183 static struct its_collection
*find_collection(struct vgic_its
*its
, int coll_id
)
185 struct its_collection
*collection
;
187 list_for_each_entry(collection
, &its
->collection_list
, coll_list
) {
188 if (coll_id
== collection
->collection_id
)
195 #define LPI_PROP_ENABLE_BIT(p) ((p) & LPI_PROP_ENABLED)
196 #define LPI_PROP_PRIORITY(p) ((p) & 0xfc)
199 * Reads the configuration data for a given LPI from guest memory and
200 * updates the fields in struct vgic_irq.
201 * If filter_vcpu is not NULL, applies only if the IRQ is targeting this
202 * VCPU. Unconditionally applies if filter_vcpu is NULL.
204 static int update_lpi_config(struct kvm
*kvm
, struct vgic_irq
*irq
,
205 struct kvm_vcpu
*filter_vcpu
)
207 u64 propbase
= PROPBASER_ADDRESS(kvm
->arch
.vgic
.propbaser
);
211 ret
= kvm_read_guest(kvm
, propbase
+ irq
->intid
- GIC_LPI_OFFSET
,
217 spin_lock(&irq
->irq_lock
);
219 if (!filter_vcpu
|| filter_vcpu
== irq
->target_vcpu
) {
220 irq
->priority
= LPI_PROP_PRIORITY(prop
);
221 irq
->enabled
= LPI_PROP_ENABLE_BIT(prop
);
223 vgic_queue_irq_unlock(kvm
, irq
);
225 spin_unlock(&irq
->irq_lock
);
232 * Create a snapshot of the current LPI list, so that we can enumerate all
233 * LPIs without holding any lock.
234 * Returns the array length and puts the kmalloc'ed array into intid_ptr.
236 static int vgic_copy_lpi_list(struct kvm
*kvm
, u32
**intid_ptr
)
238 struct vgic_dist
*dist
= &kvm
->arch
.vgic
;
239 struct vgic_irq
*irq
;
241 int irq_count
= dist
->lpi_list_count
, i
= 0;
244 * We use the current value of the list length, which may change
245 * after the kmalloc. We don't care, because the guest shouldn't
246 * change anything while the command handling is still running,
247 * and in the worst case we would miss a new IRQ, which one wouldn't
248 * expect to be covered by this command anyway.
250 intids
= kmalloc_array(irq_count
, sizeof(intids
[0]), GFP_KERNEL
);
254 spin_lock(&dist
->lpi_list_lock
);
255 list_for_each_entry(irq
, &dist
->lpi_list_head
, lpi_list
) {
256 /* We don't need to "get" the IRQ, as we hold the list lock. */
257 intids
[i
] = irq
->intid
;
258 if (++i
== irq_count
)
261 spin_unlock(&dist
->lpi_list_lock
);
268 * Promotes the ITS view of affinity of an ITTE (which redistributor this LPI
269 * is targeting) to the VGIC's view, which deals with target VCPUs.
270 * Needs to be called whenever either the collection for a LPIs has
271 * changed or the collection itself got retargeted.
273 static void update_affinity_itte(struct kvm
*kvm
, struct its_itte
*itte
)
275 struct kvm_vcpu
*vcpu
;
277 if (!its_is_collection_mapped(itte
->collection
))
280 vcpu
= kvm_get_vcpu(kvm
, itte
->collection
->target_addr
);
282 spin_lock(&itte
->irq
->irq_lock
);
283 itte
->irq
->target_vcpu
= vcpu
;
284 spin_unlock(&itte
->irq
->irq_lock
);
288 * Updates the target VCPU for every LPI targeting this collection.
289 * Must be called with the its_lock mutex held.
291 static void update_affinity_collection(struct kvm
*kvm
, struct vgic_its
*its
,
292 struct its_collection
*coll
)
294 struct its_device
*device
;
295 struct its_itte
*itte
;
297 for_each_lpi_its(device
, itte
, its
) {
298 if (!itte
->collection
|| coll
!= itte
->collection
)
301 update_affinity_itte(kvm
, itte
);
305 static u32
max_lpis_propbaser(u64 propbaser
)
307 int nr_idbits
= (propbaser
& 0x1f) + 1;
309 return 1U << min(nr_idbits
, INTERRUPT_ID_BITS_ITS
);
313 * Scan the whole LPI pending table and sync the pending bit in there
314 * with our own data structures. This relies on the LPI being
317 static int its_sync_lpi_pending_table(struct kvm_vcpu
*vcpu
)
319 gpa_t pendbase
= PENDBASER_ADDRESS(vcpu
->arch
.vgic_cpu
.pendbaser
);
320 struct vgic_irq
*irq
;
321 int last_byte_offset
= -1;
326 nr_irqs
= vgic_copy_lpi_list(vcpu
->kvm
, &intids
);
330 for (i
= 0; i
< nr_irqs
; i
++) {
331 int byte_offset
, bit_nr
;
334 byte_offset
= intids
[i
] / BITS_PER_BYTE
;
335 bit_nr
= intids
[i
] % BITS_PER_BYTE
;
338 * For contiguously allocated LPIs chances are we just read
339 * this very same byte in the last iteration. Reuse that.
341 if (byte_offset
!= last_byte_offset
) {
342 ret
= kvm_read_guest(vcpu
->kvm
, pendbase
+ byte_offset
,
348 last_byte_offset
= byte_offset
;
351 irq
= vgic_get_irq(vcpu
->kvm
, NULL
, intids
[i
]);
352 spin_lock(&irq
->irq_lock
);
353 irq
->pending
= pendmask
& (1U << bit_nr
);
354 vgic_queue_irq_unlock(vcpu
->kvm
, irq
);
355 vgic_put_irq(vcpu
->kvm
, irq
);
363 static unsigned long vgic_mmio_read_its_ctlr(struct kvm
*vcpu
,
364 struct vgic_its
*its
,
365 gpa_t addr
, unsigned int len
)
369 mutex_lock(&its
->cmd_lock
);
370 if (its
->creadr
== its
->cwriter
)
371 reg
|= GITS_CTLR_QUIESCENT
;
373 reg
|= GITS_CTLR_ENABLE
;
374 mutex_unlock(&its
->cmd_lock
);
379 static void vgic_mmio_write_its_ctlr(struct kvm
*kvm
, struct vgic_its
*its
,
380 gpa_t addr
, unsigned int len
,
383 its
->enabled
= !!(val
& GITS_CTLR_ENABLE
);
386 static unsigned long vgic_mmio_read_its_typer(struct kvm
*kvm
,
387 struct vgic_its
*its
,
388 gpa_t addr
, unsigned int len
)
390 u64 reg
= GITS_TYPER_PLPIS
;
393 * We use linear CPU numbers for redistributor addressing,
394 * so GITS_TYPER.PTA is 0.
395 * Also we force all PROPBASER registers to be the same, so
396 * CommonLPIAff is 0 as well.
397 * To avoid memory waste in the guest, we keep the number of IDBits and
398 * DevBits low - as least for the time being.
400 reg
|= 0x0f << GITS_TYPER_DEVBITS_SHIFT
;
401 reg
|= 0x0f << GITS_TYPER_IDBITS_SHIFT
;
403 return extract_bytes(reg
, addr
& 7, len
);
406 static unsigned long vgic_mmio_read_its_iidr(struct kvm
*kvm
,
407 struct vgic_its
*its
,
408 gpa_t addr
, unsigned int len
)
410 return (PRODUCT_ID_KVM
<< 24) | (IMPLEMENTER_ARM
<< 0);
413 static unsigned long vgic_mmio_read_its_idregs(struct kvm
*kvm
,
414 struct vgic_its
*its
,
415 gpa_t addr
, unsigned int len
)
417 switch (addr
& 0xffff) {
419 return 0x92; /* part number, bits[7:0] */
421 return 0xb4; /* part number, bits[11:8] */
423 return GIC_PIDR2_ARCH_GICv3
| 0x0b;
425 return 0x40; /* This is a 64K software visible page */
426 /* The following are the ID registers for (any) GIC. */
440 /* Requires the its_lock to be held. */
441 static void its_free_itte(struct kvm
*kvm
, struct its_itte
*itte
)
443 list_del(&itte
->itte_list
);
445 /* This put matches the get in vgic_add_lpi. */
446 vgic_put_irq(kvm
, itte
->irq
);
451 static u64
its_cmd_mask_field(u64
*its_cmd
, int word
, int shift
, int size
)
453 return (le64_to_cpu(its_cmd
[word
]) >> shift
) & (BIT_ULL(size
) - 1);
456 #define its_cmd_get_command(cmd) its_cmd_mask_field(cmd, 0, 0, 8)
457 #define its_cmd_get_deviceid(cmd) its_cmd_mask_field(cmd, 0, 32, 32)
458 #define its_cmd_get_id(cmd) its_cmd_mask_field(cmd, 1, 0, 32)
459 #define its_cmd_get_physical_id(cmd) its_cmd_mask_field(cmd, 1, 32, 32)
460 #define its_cmd_get_collection(cmd) its_cmd_mask_field(cmd, 2, 0, 16)
461 #define its_cmd_get_target_addr(cmd) its_cmd_mask_field(cmd, 2, 16, 32)
462 #define its_cmd_get_validbit(cmd) its_cmd_mask_field(cmd, 2, 63, 1)
465 * The DISCARD command frees an Interrupt Translation Table Entry (ITTE).
466 * Must be called with the its_lock mutex held.
468 static int vgic_its_cmd_handle_discard(struct kvm
*kvm
, struct vgic_its
*its
,
471 u32 device_id
= its_cmd_get_deviceid(its_cmd
);
472 u32 event_id
= its_cmd_get_id(its_cmd
);
473 struct its_itte
*itte
;
476 itte
= find_itte(its
, device_id
, event_id
);
477 if (itte
&& itte
->collection
) {
479 * Though the spec talks about removing the pending state, we
480 * don't bother here since we clear the ITTE anyway and the
481 * pending state is a property of the ITTE struct.
483 its_free_itte(kvm
, itte
);
487 return E_ITS_DISCARD_UNMAPPED_INTERRUPT
;
491 * The MOVI command moves an ITTE to a different collection.
492 * Must be called with the its_lock mutex held.
494 static int vgic_its_cmd_handle_movi(struct kvm
*kvm
, struct vgic_its
*its
,
497 u32 device_id
= its_cmd_get_deviceid(its_cmd
);
498 u32 event_id
= its_cmd_get_id(its_cmd
);
499 u32 coll_id
= its_cmd_get_collection(its_cmd
);
500 struct kvm_vcpu
*vcpu
;
501 struct its_itte
*itte
;
502 struct its_collection
*collection
;
504 itte
= find_itte(its
, device_id
, event_id
);
506 return E_ITS_MOVI_UNMAPPED_INTERRUPT
;
508 if (!its_is_collection_mapped(itte
->collection
))
509 return E_ITS_MOVI_UNMAPPED_COLLECTION
;
511 collection
= find_collection(its
, coll_id
);
512 if (!its_is_collection_mapped(collection
))
513 return E_ITS_MOVI_UNMAPPED_COLLECTION
;
515 itte
->collection
= collection
;
516 vcpu
= kvm_get_vcpu(kvm
, collection
->target_addr
);
518 spin_lock(&itte
->irq
->irq_lock
);
519 itte
->irq
->target_vcpu
= vcpu
;
520 spin_unlock(&itte
->irq
->irq_lock
);
525 static void vgic_its_init_collection(struct vgic_its
*its
,
526 struct its_collection
*collection
,
529 collection
->collection_id
= coll_id
;
530 collection
->target_addr
= COLLECTION_NOT_MAPPED
;
532 list_add_tail(&collection
->coll_list
, &its
->collection_list
);
536 * The MAPTI and MAPI commands map LPIs to ITTEs.
537 * Must be called with its_lock mutex held.
539 static int vgic_its_cmd_handle_mapi(struct kvm
*kvm
, struct vgic_its
*its
,
540 u64
*its_cmd
, u8 subcmd
)
542 u32 device_id
= its_cmd_get_deviceid(its_cmd
);
543 u32 event_id
= its_cmd_get_id(its_cmd
);
544 u32 coll_id
= its_cmd_get_collection(its_cmd
);
545 struct its_itte
*itte
;
546 struct its_device
*device
;
547 struct its_collection
*collection
, *new_coll
= NULL
;
550 device
= find_its_device(its
, device_id
);
552 return E_ITS_MAPTI_UNMAPPED_DEVICE
;
554 collection
= find_collection(its
, coll_id
);
556 new_coll
= kzalloc(sizeof(struct its_collection
), GFP_KERNEL
);
561 if (subcmd
== GITS_CMD_MAPTI
)
562 lpi_nr
= its_cmd_get_physical_id(its_cmd
);
565 if (lpi_nr
< GIC_LPI_OFFSET
||
566 lpi_nr
>= max_lpis_propbaser(kvm
->arch
.vgic
.propbaser
)) {
568 return E_ITS_MAPTI_PHYSICALID_OOR
;
571 itte
= find_itte(its
, device_id
, event_id
);
573 itte
= kzalloc(sizeof(struct its_itte
), GFP_KERNEL
);
579 itte
->event_id
= event_id
;
580 list_add_tail(&itte
->itte_list
, &device
->itt_head
);
584 collection
= new_coll
;
585 vgic_its_init_collection(its
, collection
, coll_id
);
588 itte
->collection
= collection
;
590 itte
->irq
= vgic_add_lpi(kvm
, lpi_nr
);
591 update_affinity_itte(kvm
, itte
);
594 * We "cache" the configuration table entries in out struct vgic_irq's.
595 * However we only have those structs for mapped IRQs, so we read in
596 * the respective config data from memory here upon mapping the LPI.
598 update_lpi_config(kvm
, itte
->irq
, NULL
);
603 /* Requires the its_lock to be held. */
604 static void vgic_its_unmap_device(struct kvm
*kvm
, struct its_device
*device
)
606 struct its_itte
*itte
, *temp
;
609 * The spec says that unmapping a device with still valid
610 * ITTEs associated is UNPREDICTABLE. We remove all ITTEs,
611 * since we cannot leave the memory unreferenced.
613 list_for_each_entry_safe(itte
, temp
, &device
->itt_head
, itte_list
)
614 its_free_itte(kvm
, itte
);
616 list_del(&device
->dev_list
);
621 * Check whether a device ID can be stored into the guest device tables.
622 * For a direct table this is pretty easy, but gets a bit nasty for
623 * indirect tables. We check whether the resulting guest physical address
624 * is actually valid (covered by a memslot and guest accessbible).
625 * For this we have to read the respective first level entry.
627 static bool vgic_its_check_device_id(struct kvm
*kvm
, struct vgic_its
*its
,
630 u64 r
= its
->baser_device_table
;
631 int nr_entries
= GITS_BASER_NR_PAGES(r
) * SZ_64K
;
637 if (!(r
& GITS_BASER_INDIRECT
))
638 return device_id
< (nr_entries
/ GITS_BASER_ENTRY_SIZE(r
));
640 /* calculate and check the index into the 1st level */
641 index
= device_id
/ (SZ_64K
/ GITS_BASER_ENTRY_SIZE(r
));
642 if (index
>= (nr_entries
/ sizeof(u64
)))
645 /* Each 1st level entry is represented by a 64-bit value. */
646 if (!kvm_read_guest(kvm
,
647 BASER_ADDRESS(r
) + index
* sizeof(indirect_ptr
),
648 &indirect_ptr
, sizeof(indirect_ptr
)))
651 /* check the valid bit of the first level entry */
652 if (!(indirect_ptr
& BIT_ULL(63)))
656 * Mask the guest physical address and calculate the frame number.
657 * Any address beyond our supported 48 bits of PA will be caught
658 * by the actual check in the final step.
660 gfn
= (indirect_ptr
& GENMASK_ULL(51, 16)) >> PAGE_SHIFT
;
662 return kvm_is_visible_gfn(kvm
, gfn
);
666 * MAPD maps or unmaps a device ID to Interrupt Translation Tables (ITTs).
667 * Must be called with the its_lock mutex held.
669 static int vgic_its_cmd_handle_mapd(struct kvm
*kvm
, struct vgic_its
*its
,
672 u32 device_id
= its_cmd_get_deviceid(its_cmd
);
673 bool valid
= its_cmd_get_validbit(its_cmd
);
674 struct its_device
*device
;
676 if (!vgic_its_check_device_id(kvm
, its
, device_id
))
677 return E_ITS_MAPD_DEVICE_OOR
;
679 device
= find_its_device(its
, device_id
);
682 * The spec says that calling MAPD on an already mapped device
683 * invalidates all cached data for this device. We implement this
684 * by removing the mapping and re-establishing it.
687 vgic_its_unmap_device(kvm
, device
);
690 * The spec does not say whether unmapping a not-mapped device
691 * is an error, so we are done in any case.
696 device
= kzalloc(sizeof(struct its_device
), GFP_KERNEL
);
700 device
->device_id
= device_id
;
701 INIT_LIST_HEAD(&device
->itt_head
);
703 list_add_tail(&device
->dev_list
, &its
->device_list
);
708 static int vgic_its_nr_collection_ids(struct vgic_its
*its
)
710 u64 r
= its
->baser_coll_table
;
712 return (GITS_BASER_NR_PAGES(r
) * SZ_64K
) / GITS_BASER_ENTRY_SIZE(r
);
716 * The MAPC command maps collection IDs to redistributors.
717 * Must be called with the its_lock mutex held.
719 static int vgic_its_cmd_handle_mapc(struct kvm
*kvm
, struct vgic_its
*its
,
724 struct its_collection
*collection
;
727 valid
= its_cmd_get_validbit(its_cmd
);
728 coll_id
= its_cmd_get_collection(its_cmd
);
729 target_addr
= its_cmd_get_target_addr(its_cmd
);
731 if (target_addr
>= atomic_read(&kvm
->online_vcpus
))
732 return E_ITS_MAPC_PROCNUM_OOR
;
734 if (coll_id
>= vgic_its_nr_collection_ids(its
))
735 return E_ITS_MAPC_COLLECTION_OOR
;
737 collection
= find_collection(its
, coll_id
);
740 struct its_device
*device
;
741 struct its_itte
*itte
;
743 * Clearing the mapping for that collection ID removes the
744 * entry from the list. If there wasn't any before, we can
750 for_each_lpi_its(device
, itte
, its
)
751 if (itte
->collection
&&
752 itte
->collection
->collection_id
== coll_id
)
753 itte
->collection
= NULL
;
755 list_del(&collection
->coll_list
);
759 collection
= kzalloc(sizeof(struct its_collection
),
764 vgic_its_init_collection(its
, collection
, coll_id
);
765 collection
->target_addr
= target_addr
;
767 collection
->target_addr
= target_addr
;
768 update_affinity_collection(kvm
, its
, collection
);
776 * The CLEAR command removes the pending state for a particular LPI.
777 * Must be called with the its_lock mutex held.
779 static int vgic_its_cmd_handle_clear(struct kvm
*kvm
, struct vgic_its
*its
,
782 u32 device_id
= its_cmd_get_deviceid(its_cmd
);
783 u32 event_id
= its_cmd_get_id(its_cmd
);
784 struct its_itte
*itte
;
787 itte
= find_itte(its
, device_id
, event_id
);
789 return E_ITS_CLEAR_UNMAPPED_INTERRUPT
;
791 itte
->irq
->pending
= false;
797 * The INV command syncs the configuration bits from the memory table.
798 * Must be called with the its_lock mutex held.
800 static int vgic_its_cmd_handle_inv(struct kvm
*kvm
, struct vgic_its
*its
,
803 u32 device_id
= its_cmd_get_deviceid(its_cmd
);
804 u32 event_id
= its_cmd_get_id(its_cmd
);
805 struct its_itte
*itte
;
808 itte
= find_itte(its
, device_id
, event_id
);
810 return E_ITS_INV_UNMAPPED_INTERRUPT
;
812 return update_lpi_config(kvm
, itte
->irq
, NULL
);
816 * The INVALL command requests flushing of all IRQ data in this collection.
817 * Find the VCPU mapped to that collection, then iterate over the VM's list
818 * of mapped LPIs and update the configuration for each IRQ which targets
819 * the specified vcpu. The configuration will be read from the in-memory
820 * configuration table.
821 * Must be called with the its_lock mutex held.
823 static int vgic_its_cmd_handle_invall(struct kvm
*kvm
, struct vgic_its
*its
,
826 u32 coll_id
= its_cmd_get_collection(its_cmd
);
827 struct its_collection
*collection
;
828 struct kvm_vcpu
*vcpu
;
829 struct vgic_irq
*irq
;
833 collection
= find_collection(its
, coll_id
);
834 if (!its_is_collection_mapped(collection
))
835 return E_ITS_INVALL_UNMAPPED_COLLECTION
;
837 vcpu
= kvm_get_vcpu(kvm
, collection
->target_addr
);
839 irq_count
= vgic_copy_lpi_list(kvm
, &intids
);
843 for (i
= 0; i
< irq_count
; i
++) {
844 irq
= vgic_get_irq(kvm
, NULL
, intids
[i
]);
847 update_lpi_config(kvm
, irq
, vcpu
);
848 vgic_put_irq(kvm
, irq
);
857 * The MOVALL command moves the pending state of all IRQs targeting one
858 * redistributor to another. We don't hold the pending state in the VCPUs,
859 * but in the IRQs instead, so there is really not much to do for us here.
860 * However the spec says that no IRQ must target the old redistributor
861 * afterwards, so we make sure that no LPI is using the associated target_vcpu.
862 * This command affects all LPIs in the system that target that redistributor.
864 static int vgic_its_cmd_handle_movall(struct kvm
*kvm
, struct vgic_its
*its
,
867 struct vgic_dist
*dist
= &kvm
->arch
.vgic
;
868 u32 target1_addr
= its_cmd_get_target_addr(its_cmd
);
869 u32 target2_addr
= its_cmd_mask_field(its_cmd
, 3, 16, 32);
870 struct kvm_vcpu
*vcpu1
, *vcpu2
;
871 struct vgic_irq
*irq
;
873 if (target1_addr
>= atomic_read(&kvm
->online_vcpus
) ||
874 target2_addr
>= atomic_read(&kvm
->online_vcpus
))
875 return E_ITS_MOVALL_PROCNUM_OOR
;
877 if (target1_addr
== target2_addr
)
880 vcpu1
= kvm_get_vcpu(kvm
, target1_addr
);
881 vcpu2
= kvm_get_vcpu(kvm
, target2_addr
);
883 spin_lock(&dist
->lpi_list_lock
);
885 list_for_each_entry(irq
, &dist
->lpi_list_head
, lpi_list
) {
886 spin_lock(&irq
->irq_lock
);
888 if (irq
->target_vcpu
== vcpu1
)
889 irq
->target_vcpu
= vcpu2
;
891 spin_unlock(&irq
->irq_lock
);
894 spin_unlock(&dist
->lpi_list_lock
);
900 * This function is called with the its_cmd lock held, but the ITS data
901 * structure lock dropped.
903 static int vgic_its_handle_command(struct kvm
*kvm
, struct vgic_its
*its
,
906 u8 cmd
= its_cmd_get_command(its_cmd
);
909 mutex_lock(&its
->its_lock
);
912 ret
= vgic_its_cmd_handle_mapd(kvm
, its
, its_cmd
);
915 ret
= vgic_its_cmd_handle_mapc(kvm
, its
, its_cmd
);
918 ret
= vgic_its_cmd_handle_mapi(kvm
, its
, its_cmd
, cmd
);
921 ret
= vgic_its_cmd_handle_mapi(kvm
, its
, its_cmd
, cmd
);
924 ret
= vgic_its_cmd_handle_movi(kvm
, its
, its_cmd
);
926 case GITS_CMD_DISCARD
:
927 ret
= vgic_its_cmd_handle_discard(kvm
, its
, its_cmd
);
930 ret
= vgic_its_cmd_handle_clear(kvm
, its
, its_cmd
);
932 case GITS_CMD_MOVALL
:
933 ret
= vgic_its_cmd_handle_movall(kvm
, its
, its_cmd
);
936 ret
= vgic_its_cmd_handle_inv(kvm
, its
, its_cmd
);
938 case GITS_CMD_INVALL
:
939 ret
= vgic_its_cmd_handle_invall(kvm
, its
, its_cmd
);
942 /* we ignore this command: we are in sync all of the time */
946 mutex_unlock(&its
->its_lock
);
951 static u64
vgic_sanitise_its_baser(u64 reg
)
953 reg
= vgic_sanitise_field(reg
, GITS_BASER_SHAREABILITY_MASK
,
954 GITS_BASER_SHAREABILITY_SHIFT
,
955 vgic_sanitise_shareability
);
956 reg
= vgic_sanitise_field(reg
, GITS_BASER_INNER_CACHEABILITY_MASK
,
957 GITS_BASER_INNER_CACHEABILITY_SHIFT
,
958 vgic_sanitise_inner_cacheability
);
959 reg
= vgic_sanitise_field(reg
, GITS_BASER_OUTER_CACHEABILITY_MASK
,
960 GITS_BASER_OUTER_CACHEABILITY_SHIFT
,
961 vgic_sanitise_outer_cacheability
);
963 /* Bits 15:12 contain bits 51:48 of the PA, which we don't support. */
964 reg
&= ~GENMASK_ULL(15, 12);
966 /* We support only one (ITS) page size: 64K */
967 reg
= (reg
& ~GITS_BASER_PAGE_SIZE_MASK
) | GITS_BASER_PAGE_SIZE_64K
;
972 static u64
vgic_sanitise_its_cbaser(u64 reg
)
974 reg
= vgic_sanitise_field(reg
, GITS_CBASER_SHAREABILITY_MASK
,
975 GITS_CBASER_SHAREABILITY_SHIFT
,
976 vgic_sanitise_shareability
);
977 reg
= vgic_sanitise_field(reg
, GITS_CBASER_INNER_CACHEABILITY_MASK
,
978 GITS_CBASER_INNER_CACHEABILITY_SHIFT
,
979 vgic_sanitise_inner_cacheability
);
980 reg
= vgic_sanitise_field(reg
, GITS_CBASER_OUTER_CACHEABILITY_MASK
,
981 GITS_CBASER_OUTER_CACHEABILITY_SHIFT
,
982 vgic_sanitise_outer_cacheability
);
985 * Sanitise the physical address to be 64k aligned.
986 * Also limit the physical addresses to 48 bits.
988 reg
&= ~(GENMASK_ULL(51, 48) | GENMASK_ULL(15, 12));
993 static unsigned long vgic_mmio_read_its_cbaser(struct kvm
*kvm
,
994 struct vgic_its
*its
,
995 gpa_t addr
, unsigned int len
)
997 return extract_bytes(its
->cbaser
, addr
& 7, len
);
1000 static void vgic_mmio_write_its_cbaser(struct kvm
*kvm
, struct vgic_its
*its
,
1001 gpa_t addr
, unsigned int len
,
1004 /* When GITS_CTLR.Enable is 1, this register is RO. */
1008 mutex_lock(&its
->cmd_lock
);
1009 its
->cbaser
= update_64bit_reg(its
->cbaser
, addr
& 7, len
, val
);
1010 its
->cbaser
= vgic_sanitise_its_cbaser(its
->cbaser
);
1013 * CWRITER is architecturally UNKNOWN on reset, but we need to reset
1014 * it to CREADR to make sure we start with an empty command buffer.
1016 its
->cwriter
= its
->creadr
;
1017 mutex_unlock(&its
->cmd_lock
);
1020 #define ITS_CMD_BUFFER_SIZE(baser) ((((baser) & 0xff) + 1) << 12)
1021 #define ITS_CMD_SIZE 32
1022 #define ITS_CMD_OFFSET(reg) ((reg) & GENMASK(19, 5))
1025 * By writing to CWRITER the guest announces new commands to be processed.
1026 * To avoid any races in the first place, we take the its_cmd lock, which
1027 * protects our ring buffer variables, so that there is only one user
1028 * per ITS handling commands at a given time.
1030 static void vgic_mmio_write_its_cwriter(struct kvm
*kvm
, struct vgic_its
*its
,
1031 gpa_t addr
, unsigned int len
,
1041 mutex_lock(&its
->cmd_lock
);
1043 reg
= update_64bit_reg(its
->cwriter
, addr
& 7, len
, val
);
1044 reg
= ITS_CMD_OFFSET(reg
);
1045 if (reg
>= ITS_CMD_BUFFER_SIZE(its
->cbaser
)) {
1046 mutex_unlock(&its
->cmd_lock
);
1051 cbaser
= CBASER_ADDRESS(its
->cbaser
);
1053 while (its
->cwriter
!= its
->creadr
) {
1054 int ret
= kvm_read_guest(kvm
, cbaser
+ its
->creadr
,
1055 cmd_buf
, ITS_CMD_SIZE
);
1057 * If kvm_read_guest() fails, this could be due to the guest
1058 * programming a bogus value in CBASER or something else going
1059 * wrong from which we cannot easily recover.
1060 * According to section 6.3.2 in the GICv3 spec we can just
1061 * ignore that command then.
1064 vgic_its_handle_command(kvm
, its
, cmd_buf
);
1066 its
->creadr
+= ITS_CMD_SIZE
;
1067 if (its
->creadr
== ITS_CMD_BUFFER_SIZE(its
->cbaser
))
1071 mutex_unlock(&its
->cmd_lock
);
1074 static unsigned long vgic_mmio_read_its_cwriter(struct kvm
*kvm
,
1075 struct vgic_its
*its
,
1076 gpa_t addr
, unsigned int len
)
1078 return extract_bytes(its
->cwriter
, addr
& 0x7, len
);
1081 static unsigned long vgic_mmio_read_its_creadr(struct kvm
*kvm
,
1082 struct vgic_its
*its
,
1083 gpa_t addr
, unsigned int len
)
1085 return extract_bytes(its
->creadr
, addr
& 0x7, len
);
1088 #define BASER_INDEX(addr) (((addr) / sizeof(u64)) & 0x7)
1089 static unsigned long vgic_mmio_read_its_baser(struct kvm
*kvm
,
1090 struct vgic_its
*its
,
1091 gpa_t addr
, unsigned int len
)
1095 switch (BASER_INDEX(addr
)) {
1097 reg
= its
->baser_device_table
;
1100 reg
= its
->baser_coll_table
;
1107 return extract_bytes(reg
, addr
& 7, len
);
1110 #define GITS_BASER_RO_MASK (GENMASK_ULL(52, 48) | GENMASK_ULL(58, 56))
1111 static void vgic_mmio_write_its_baser(struct kvm
*kvm
,
1112 struct vgic_its
*its
,
1113 gpa_t addr
, unsigned int len
,
1116 u64 entry_size
, device_type
;
1117 u64 reg
, *regptr
, clearbits
= 0;
1119 /* When GITS_CTLR.Enable is 1, we ignore write accesses. */
1123 switch (BASER_INDEX(addr
)) {
1125 regptr
= &its
->baser_device_table
;
1127 device_type
= GITS_BASER_TYPE_DEVICE
;
1130 regptr
= &its
->baser_coll_table
;
1132 device_type
= GITS_BASER_TYPE_COLLECTION
;
1133 clearbits
= GITS_BASER_INDIRECT
;
1139 reg
= update_64bit_reg(*regptr
, addr
& 7, len
, val
);
1140 reg
&= ~GITS_BASER_RO_MASK
;
1143 reg
|= (entry_size
- 1) << GITS_BASER_ENTRY_SIZE_SHIFT
;
1144 reg
|= device_type
<< GITS_BASER_TYPE_SHIFT
;
1145 reg
= vgic_sanitise_its_baser(reg
);
1150 #define REGISTER_ITS_DESC(off, rd, wr, length, acc) \
1152 .reg_offset = off, \
1154 .access_flags = acc, \
1159 static void its_mmio_write_wi(struct kvm
*kvm
, struct vgic_its
*its
,
1160 gpa_t addr
, unsigned int len
, unsigned long val
)
1165 static struct vgic_register_region its_registers
[] = {
1166 REGISTER_ITS_DESC(GITS_CTLR
,
1167 vgic_mmio_read_its_ctlr
, vgic_mmio_write_its_ctlr
, 4,
1169 REGISTER_ITS_DESC(GITS_IIDR
,
1170 vgic_mmio_read_its_iidr
, its_mmio_write_wi
, 4,
1172 REGISTER_ITS_DESC(GITS_TYPER
,
1173 vgic_mmio_read_its_typer
, its_mmio_write_wi
, 8,
1174 VGIC_ACCESS_64bit
| VGIC_ACCESS_32bit
),
1175 REGISTER_ITS_DESC(GITS_CBASER
,
1176 vgic_mmio_read_its_cbaser
, vgic_mmio_write_its_cbaser
, 8,
1177 VGIC_ACCESS_64bit
| VGIC_ACCESS_32bit
),
1178 REGISTER_ITS_DESC(GITS_CWRITER
,
1179 vgic_mmio_read_its_cwriter
, vgic_mmio_write_its_cwriter
, 8,
1180 VGIC_ACCESS_64bit
| VGIC_ACCESS_32bit
),
1181 REGISTER_ITS_DESC(GITS_CREADR
,
1182 vgic_mmio_read_its_creadr
, its_mmio_write_wi
, 8,
1183 VGIC_ACCESS_64bit
| VGIC_ACCESS_32bit
),
1184 REGISTER_ITS_DESC(GITS_BASER
,
1185 vgic_mmio_read_its_baser
, vgic_mmio_write_its_baser
, 0x40,
1186 VGIC_ACCESS_64bit
| VGIC_ACCESS_32bit
),
1187 REGISTER_ITS_DESC(GITS_IDREGS_BASE
,
1188 vgic_mmio_read_its_idregs
, its_mmio_write_wi
, 0x30,
1192 /* This is called on setting the LPI enable bit in the redistributor. */
1193 void vgic_enable_lpis(struct kvm_vcpu
*vcpu
)
1195 if (!(vcpu
->arch
.vgic_cpu
.pendbaser
& GICR_PENDBASER_PTZ
))
1196 its_sync_lpi_pending_table(vcpu
);
1199 static int vgic_its_init_its(struct kvm
*kvm
, struct vgic_its
*its
)
1201 struct vgic_io_device
*iodev
= &its
->iodev
;
1204 if (its
->initialized
)
1207 if (IS_VGIC_ADDR_UNDEF(its
->vgic_its_base
))
1210 iodev
->regions
= its_registers
;
1211 iodev
->nr_regions
= ARRAY_SIZE(its_registers
);
1212 kvm_iodevice_init(&iodev
->dev
, &kvm_io_gic_ops
);
1214 iodev
->base_addr
= its
->vgic_its_base
;
1215 iodev
->iodev_type
= IODEV_ITS
;
1217 mutex_lock(&kvm
->slots_lock
);
1218 ret
= kvm_io_bus_register_dev(kvm
, KVM_MMIO_BUS
, iodev
->base_addr
,
1219 KVM_VGIC_V3_ITS_SIZE
, &iodev
->dev
);
1220 mutex_unlock(&kvm
->slots_lock
);
1223 its
->initialized
= true;
1228 #define INITIAL_BASER_VALUE \
1229 (GIC_BASER_CACHEABILITY(GITS_BASER, INNER, RaWb) | \
1230 GIC_BASER_CACHEABILITY(GITS_BASER, OUTER, SameAsInner) | \
1231 GIC_BASER_SHAREABILITY(GITS_BASER, InnerShareable) | \
1232 ((8ULL - 1) << GITS_BASER_ENTRY_SIZE_SHIFT) | \
1233 GITS_BASER_PAGE_SIZE_64K)
1235 #define INITIAL_PROPBASER_VALUE \
1236 (GIC_BASER_CACHEABILITY(GICR_PROPBASER, INNER, RaWb) | \
1237 GIC_BASER_CACHEABILITY(GICR_PROPBASER, OUTER, SameAsInner) | \
1238 GIC_BASER_SHAREABILITY(GICR_PROPBASER, InnerShareable))
1240 static int vgic_its_create(struct kvm_device
*dev
, u32 type
)
1242 struct vgic_its
*its
;
1244 if (type
!= KVM_DEV_TYPE_ARM_VGIC_ITS
)
1247 its
= kzalloc(sizeof(struct vgic_its
), GFP_KERNEL
);
1251 mutex_init(&its
->its_lock
);
1252 mutex_init(&its
->cmd_lock
);
1254 its
->vgic_its_base
= VGIC_ADDR_UNDEF
;
1256 INIT_LIST_HEAD(&its
->device_list
);
1257 INIT_LIST_HEAD(&its
->collection_list
);
1259 dev
->kvm
->arch
.vgic
.has_its
= true;
1260 its
->initialized
= false;
1261 its
->enabled
= false;
1263 its
->baser_device_table
= INITIAL_BASER_VALUE
|
1264 ((u64
)GITS_BASER_TYPE_DEVICE
<< GITS_BASER_TYPE_SHIFT
);
1265 its
->baser_coll_table
= INITIAL_BASER_VALUE
|
1266 ((u64
)GITS_BASER_TYPE_COLLECTION
<< GITS_BASER_TYPE_SHIFT
);
1267 dev
->kvm
->arch
.vgic
.propbaser
= INITIAL_PROPBASER_VALUE
;
1274 static void vgic_its_destroy(struct kvm_device
*kvm_dev
)
1276 struct kvm
*kvm
= kvm_dev
->kvm
;
1277 struct vgic_its
*its
= kvm_dev
->private;
1278 struct its_device
*dev
;
1279 struct its_itte
*itte
;
1280 struct list_head
*dev_cur
, *dev_temp
;
1281 struct list_head
*cur
, *temp
;
1284 * We may end up here without the lists ever having been initialized.
1285 * Check this and bail out early to avoid dereferencing a NULL pointer.
1287 if (!its
->device_list
.next
)
1290 mutex_lock(&its
->its_lock
);
1291 list_for_each_safe(dev_cur
, dev_temp
, &its
->device_list
) {
1292 dev
= container_of(dev_cur
, struct its_device
, dev_list
);
1293 list_for_each_safe(cur
, temp
, &dev
->itt_head
) {
1294 itte
= (container_of(cur
, struct its_itte
, itte_list
));
1295 its_free_itte(kvm
, itte
);
1301 list_for_each_safe(cur
, temp
, &its
->collection_list
) {
1303 kfree(container_of(cur
, struct its_collection
, coll_list
));
1305 mutex_unlock(&its
->its_lock
);
1310 static int vgic_its_has_attr(struct kvm_device
*dev
,
1311 struct kvm_device_attr
*attr
)
1313 switch (attr
->group
) {
1314 case KVM_DEV_ARM_VGIC_GRP_ADDR
:
1315 switch (attr
->attr
) {
1316 case KVM_VGIC_ITS_ADDR_TYPE
:
1320 case KVM_DEV_ARM_VGIC_GRP_CTRL
:
1321 switch (attr
->attr
) {
1322 case KVM_DEV_ARM_VGIC_CTRL_INIT
:
1330 static int vgic_its_set_attr(struct kvm_device
*dev
,
1331 struct kvm_device_attr
*attr
)
1333 struct vgic_its
*its
= dev
->private;
1336 switch (attr
->group
) {
1337 case KVM_DEV_ARM_VGIC_GRP_ADDR
: {
1338 u64 __user
*uaddr
= (u64 __user
*)(long)attr
->addr
;
1339 unsigned long type
= (unsigned long)attr
->attr
;
1342 if (type
!= KVM_VGIC_ITS_ADDR_TYPE
)
1345 if (its
->initialized
)
1348 if (copy_from_user(&addr
, uaddr
, sizeof(addr
)))
1351 ret
= vgic_check_ioaddr(dev
->kvm
, &its
->vgic_its_base
,
1356 its
->vgic_its_base
= addr
;
1360 case KVM_DEV_ARM_VGIC_GRP_CTRL
:
1361 switch (attr
->attr
) {
1362 case KVM_DEV_ARM_VGIC_CTRL_INIT
:
1363 return vgic_its_init_its(dev
->kvm
, its
);
1370 static int vgic_its_get_attr(struct kvm_device
*dev
,
1371 struct kvm_device_attr
*attr
)
1373 switch (attr
->group
) {
1374 case KVM_DEV_ARM_VGIC_GRP_ADDR
: {
1375 struct vgic_its
*its
= dev
->private;
1376 u64 addr
= its
->vgic_its_base
;
1377 u64 __user
*uaddr
= (u64 __user
*)(long)attr
->addr
;
1378 unsigned long type
= (unsigned long)attr
->attr
;
1380 if (type
!= KVM_VGIC_ITS_ADDR_TYPE
)
1383 if (copy_to_user(uaddr
, &addr
, sizeof(addr
)))
1394 static struct kvm_device_ops kvm_arm_vgic_its_ops
= {
1395 .name
= "kvm-arm-vgic-its",
1396 .create
= vgic_its_create
,
1397 .destroy
= vgic_its_destroy
,
1398 .set_attr
= vgic_its_set_attr
,
1399 .get_attr
= vgic_its_get_attr
,
1400 .has_attr
= vgic_its_has_attr
,
1403 int kvm_vgic_register_its_device(void)
1405 return kvm_register_device_ops(&kvm_arm_vgic_its_ops
,
1406 KVM_DEV_TYPE_ARM_VGIC_ITS
);