4 * Copyright IBM, Corp. 2007
5 * Copyright (c) 2009 CodeSourcery
8 * Anthony Liguori <aliguori@us.ibm.com>
9 * Paul Brook <paul@codesourcery.com>
11 * This work is licensed under the terms of the GNU GPL, version 2. See
12 * the COPYING file in the top-level directory.
14 * Contributions after 2012-01-13 are licensed under the terms of the
15 * GNU GPL, version 2 or (at your option) any later version.
18 #include "qemu/osdep.h"
20 #include "exec/memop.h"
21 #include "standard-headers/linux/virtio_pci.h"
22 #include "hw/boards.h"
23 #include "hw/virtio/virtio.h"
24 #include "migration/qemu-file-types.h"
25 #include "hw/pci/pci.h"
26 #include "hw/pci/pci_bus.h"
27 #include "hw/qdev-properties.h"
28 #include "qapi/error.h"
29 #include "qemu/error-report.h"
31 #include "qemu/module.h"
32 #include "hw/pci/msi.h"
33 #include "hw/pci/msix.h"
34 #include "hw/loader.h"
35 #include "sysemu/kvm.h"
36 #include "virtio-pci.h"
37 #include "qemu/range.h"
38 #include "hw/virtio/virtio-bus.h"
39 #include "qapi/visitor.h"
40 #include "sysemu/replay.h"
42 #define VIRTIO_PCI_REGION_SIZE(dev) VIRTIO_PCI_CONFIG_OFF(msix_present(dev))
44 #undef VIRTIO_PCI_CONFIG
46 /* The remaining space is defined by each driver as the per-driver
47 * configuration space */
48 #define VIRTIO_PCI_CONFIG_SIZE(dev) VIRTIO_PCI_CONFIG_OFF(msix_enabled(dev))
50 static void virtio_pci_bus_new(VirtioBusState
*bus
, size_t bus_size
,
52 static void virtio_pci_reset(DeviceState
*qdev
);
55 /* DeviceState to VirtIOPCIProxy. For use off data-path. TODO: use QOM. */
56 static inline VirtIOPCIProxy
*to_virtio_pci_proxy(DeviceState
*d
)
58 return container_of(d
, VirtIOPCIProxy
, pci_dev
.qdev
);
61 /* DeviceState to VirtIOPCIProxy. Note: used on datapath,
62 * be careful and test performance if you change this.
64 static inline VirtIOPCIProxy
*to_virtio_pci_proxy_fast(DeviceState
*d
)
66 return container_of(d
, VirtIOPCIProxy
, pci_dev
.qdev
);
69 static void virtio_pci_notify(DeviceState
*d
, uint16_t vector
)
71 VirtIOPCIProxy
*proxy
= to_virtio_pci_proxy_fast(d
);
73 if (msix_enabled(&proxy
->pci_dev
))
74 msix_notify(&proxy
->pci_dev
, vector
);
76 VirtIODevice
*vdev
= virtio_bus_get_device(&proxy
->bus
);
77 pci_set_irq(&proxy
->pci_dev
, qatomic_read(&vdev
->isr
) & 1);
81 static void virtio_pci_save_config(DeviceState
*d
, QEMUFile
*f
)
83 VirtIOPCIProxy
*proxy
= to_virtio_pci_proxy(d
);
84 VirtIODevice
*vdev
= virtio_bus_get_device(&proxy
->bus
);
86 pci_device_save(&proxy
->pci_dev
, f
);
87 msix_save(&proxy
->pci_dev
, f
);
88 if (msix_present(&proxy
->pci_dev
))
89 qemu_put_be16(f
, vdev
->config_vector
);
92 static const VMStateDescription vmstate_virtio_pci_modern_queue_state
= {
93 .name
= "virtio_pci/modern_queue_state",
95 .minimum_version_id
= 1,
96 .fields
= (VMStateField
[]) {
97 VMSTATE_UINT16(num
, VirtIOPCIQueue
),
98 VMSTATE_UNUSED(1), /* enabled was stored as be16 */
99 VMSTATE_BOOL(enabled
, VirtIOPCIQueue
),
100 VMSTATE_UINT32_ARRAY(desc
, VirtIOPCIQueue
, 2),
101 VMSTATE_UINT32_ARRAY(avail
, VirtIOPCIQueue
, 2),
102 VMSTATE_UINT32_ARRAY(used
, VirtIOPCIQueue
, 2),
103 VMSTATE_END_OF_LIST()
107 static bool virtio_pci_modern_state_needed(void *opaque
)
109 VirtIOPCIProxy
*proxy
= opaque
;
111 return virtio_pci_modern(proxy
);
114 static const VMStateDescription vmstate_virtio_pci_modern_state_sub
= {
115 .name
= "virtio_pci/modern_state",
117 .minimum_version_id
= 1,
118 .needed
= &virtio_pci_modern_state_needed
,
119 .fields
= (VMStateField
[]) {
120 VMSTATE_UINT32(dfselect
, VirtIOPCIProxy
),
121 VMSTATE_UINT32(gfselect
, VirtIOPCIProxy
),
122 VMSTATE_UINT32_ARRAY(guest_features
, VirtIOPCIProxy
, 2),
123 VMSTATE_STRUCT_ARRAY(vqs
, VirtIOPCIProxy
, VIRTIO_QUEUE_MAX
, 0,
124 vmstate_virtio_pci_modern_queue_state
,
126 VMSTATE_END_OF_LIST()
130 static const VMStateDescription vmstate_virtio_pci
= {
131 .name
= "virtio_pci",
133 .minimum_version_id
= 1,
134 .minimum_version_id_old
= 1,
135 .fields
= (VMStateField
[]) {
136 VMSTATE_END_OF_LIST()
138 .subsections
= (const VMStateDescription
*[]) {
139 &vmstate_virtio_pci_modern_state_sub
,
144 static bool virtio_pci_has_extra_state(DeviceState
*d
)
146 VirtIOPCIProxy
*proxy
= to_virtio_pci_proxy(d
);
148 return proxy
->flags
& VIRTIO_PCI_FLAG_MIGRATE_EXTRA
;
151 static void virtio_pci_save_extra_state(DeviceState
*d
, QEMUFile
*f
)
153 VirtIOPCIProxy
*proxy
= to_virtio_pci_proxy(d
);
155 vmstate_save_state(f
, &vmstate_virtio_pci
, proxy
, NULL
);
158 static int virtio_pci_load_extra_state(DeviceState
*d
, QEMUFile
*f
)
160 VirtIOPCIProxy
*proxy
= to_virtio_pci_proxy(d
);
162 return vmstate_load_state(f
, &vmstate_virtio_pci
, proxy
, 1);
165 static void virtio_pci_save_queue(DeviceState
*d
, int n
, QEMUFile
*f
)
167 VirtIOPCIProxy
*proxy
= to_virtio_pci_proxy(d
);
168 VirtIODevice
*vdev
= virtio_bus_get_device(&proxy
->bus
);
170 if (msix_present(&proxy
->pci_dev
))
171 qemu_put_be16(f
, virtio_queue_vector(vdev
, n
));
174 static int virtio_pci_load_config(DeviceState
*d
, QEMUFile
*f
)
176 VirtIOPCIProxy
*proxy
= to_virtio_pci_proxy(d
);
177 VirtIODevice
*vdev
= virtio_bus_get_device(&proxy
->bus
);
180 ret
= pci_device_load(&proxy
->pci_dev
, f
);
184 msix_unuse_all_vectors(&proxy
->pci_dev
);
185 msix_load(&proxy
->pci_dev
, f
);
186 if (msix_present(&proxy
->pci_dev
)) {
187 qemu_get_be16s(f
, &vdev
->config_vector
);
189 vdev
->config_vector
= VIRTIO_NO_VECTOR
;
191 if (vdev
->config_vector
!= VIRTIO_NO_VECTOR
) {
192 return msix_vector_use(&proxy
->pci_dev
, vdev
->config_vector
);
197 static int virtio_pci_load_queue(DeviceState
*d
, int n
, QEMUFile
*f
)
199 VirtIOPCIProxy
*proxy
= to_virtio_pci_proxy(d
);
200 VirtIODevice
*vdev
= virtio_bus_get_device(&proxy
->bus
);
203 if (msix_present(&proxy
->pci_dev
)) {
204 qemu_get_be16s(f
, &vector
);
206 vector
= VIRTIO_NO_VECTOR
;
208 virtio_queue_set_vector(vdev
, n
, vector
);
209 if (vector
!= VIRTIO_NO_VECTOR
) {
210 return msix_vector_use(&proxy
->pci_dev
, vector
);
216 static bool virtio_pci_ioeventfd_enabled(DeviceState
*d
)
218 VirtIOPCIProxy
*proxy
= to_virtio_pci_proxy(d
);
220 return (proxy
->flags
& VIRTIO_PCI_FLAG_USE_IOEVENTFD
) != 0;
223 #define QEMU_VIRTIO_PCI_QUEUE_MEM_MULT 0x1000
225 static inline int virtio_pci_queue_mem_mult(struct VirtIOPCIProxy
*proxy
)
227 return (proxy
->flags
& VIRTIO_PCI_FLAG_PAGE_PER_VQ
) ?
228 QEMU_VIRTIO_PCI_QUEUE_MEM_MULT
: 4;
231 static int virtio_pci_ioeventfd_assign(DeviceState
*d
, EventNotifier
*notifier
,
234 VirtIOPCIProxy
*proxy
= to_virtio_pci_proxy(d
);
235 VirtIODevice
*vdev
= virtio_bus_get_device(&proxy
->bus
);
236 VirtQueue
*vq
= virtio_get_queue(vdev
, n
);
237 bool legacy
= virtio_pci_legacy(proxy
);
238 bool modern
= virtio_pci_modern(proxy
);
239 bool fast_mmio
= kvm_ioeventfd_any_length_enabled();
240 bool modern_pio
= proxy
->flags
& VIRTIO_PCI_FLAG_MODERN_PIO_NOTIFY
;
241 MemoryRegion
*modern_mr
= &proxy
->notify
.mr
;
242 MemoryRegion
*modern_notify_mr
= &proxy
->notify_pio
.mr
;
243 MemoryRegion
*legacy_mr
= &proxy
->bar
;
244 hwaddr modern_addr
= virtio_pci_queue_mem_mult(proxy
) *
245 virtio_get_queue_index(vq
);
246 hwaddr legacy_addr
= VIRTIO_PCI_QUEUE_NOTIFY
;
251 memory_region_add_eventfd(modern_mr
, modern_addr
, 0,
254 memory_region_add_eventfd(modern_mr
, modern_addr
, 2,
258 memory_region_add_eventfd(modern_notify_mr
, 0, 2,
263 memory_region_add_eventfd(legacy_mr
, legacy_addr
, 2,
269 memory_region_del_eventfd(modern_mr
, modern_addr
, 0,
272 memory_region_del_eventfd(modern_mr
, modern_addr
, 2,
276 memory_region_del_eventfd(modern_notify_mr
, 0, 2,
281 memory_region_del_eventfd(legacy_mr
, legacy_addr
, 2,
288 static void virtio_pci_start_ioeventfd(VirtIOPCIProxy
*proxy
)
290 virtio_bus_start_ioeventfd(&proxy
->bus
);
293 static void virtio_pci_stop_ioeventfd(VirtIOPCIProxy
*proxy
)
295 virtio_bus_stop_ioeventfd(&proxy
->bus
);
298 static void virtio_ioport_write(void *opaque
, uint32_t addr
, uint32_t val
)
300 VirtIOPCIProxy
*proxy
= opaque
;
301 VirtIODevice
*vdev
= virtio_bus_get_device(&proxy
->bus
);
305 case VIRTIO_PCI_GUEST_FEATURES
:
306 /* Guest does not negotiate properly? We have to assume nothing. */
307 if (val
& (1 << VIRTIO_F_BAD_FEATURE
)) {
308 val
= virtio_bus_get_vdev_bad_features(&proxy
->bus
);
310 virtio_set_features(vdev
, val
);
312 case VIRTIO_PCI_QUEUE_PFN
:
313 pa
= (hwaddr
)val
<< VIRTIO_PCI_QUEUE_ADDR_SHIFT
;
315 virtio_pci_reset(DEVICE(proxy
));
318 virtio_queue_set_addr(vdev
, vdev
->queue_sel
, pa
);
320 case VIRTIO_PCI_QUEUE_SEL
:
321 if (val
< VIRTIO_QUEUE_MAX
)
322 vdev
->queue_sel
= val
;
324 case VIRTIO_PCI_QUEUE_NOTIFY
:
325 if (val
< VIRTIO_QUEUE_MAX
) {
326 virtio_queue_notify(vdev
, val
);
329 case VIRTIO_PCI_STATUS
:
330 if (!(val
& VIRTIO_CONFIG_S_DRIVER_OK
)) {
331 virtio_pci_stop_ioeventfd(proxy
);
334 virtio_set_status(vdev
, val
& 0xFF);
336 if (val
& VIRTIO_CONFIG_S_DRIVER_OK
) {
337 virtio_pci_start_ioeventfd(proxy
);
340 if (vdev
->status
== 0) {
341 virtio_pci_reset(DEVICE(proxy
));
344 /* Linux before 2.6.34 drives the device without enabling
345 the PCI device bus master bit. Enable it automatically
346 for the guest. This is a PCI spec violation but so is
347 initiating DMA with bus master bit clear. */
348 if (val
== (VIRTIO_CONFIG_S_ACKNOWLEDGE
| VIRTIO_CONFIG_S_DRIVER
)) {
349 pci_default_write_config(&proxy
->pci_dev
, PCI_COMMAND
,
350 proxy
->pci_dev
.config
[PCI_COMMAND
] |
351 PCI_COMMAND_MASTER
, 1);
354 case VIRTIO_MSI_CONFIG_VECTOR
:
355 msix_vector_unuse(&proxy
->pci_dev
, vdev
->config_vector
);
356 /* Make it possible for guest to discover an error took place. */
357 if (msix_vector_use(&proxy
->pci_dev
, val
) < 0)
358 val
= VIRTIO_NO_VECTOR
;
359 vdev
->config_vector
= val
;
361 case VIRTIO_MSI_QUEUE_VECTOR
:
362 msix_vector_unuse(&proxy
->pci_dev
,
363 virtio_queue_vector(vdev
, vdev
->queue_sel
));
364 /* Make it possible for guest to discover an error took place. */
365 if (msix_vector_use(&proxy
->pci_dev
, val
) < 0)
366 val
= VIRTIO_NO_VECTOR
;
367 virtio_queue_set_vector(vdev
, vdev
->queue_sel
, val
);
370 qemu_log_mask(LOG_GUEST_ERROR
,
371 "%s: unexpected address 0x%x value 0x%x\n",
372 __func__
, addr
, val
);
377 static uint32_t virtio_ioport_read(VirtIOPCIProxy
*proxy
, uint32_t addr
)
379 VirtIODevice
*vdev
= virtio_bus_get_device(&proxy
->bus
);
380 uint32_t ret
= 0xFFFFFFFF;
383 case VIRTIO_PCI_HOST_FEATURES
:
384 ret
= vdev
->host_features
;
386 case VIRTIO_PCI_GUEST_FEATURES
:
387 ret
= vdev
->guest_features
;
389 case VIRTIO_PCI_QUEUE_PFN
:
390 ret
= virtio_queue_get_addr(vdev
, vdev
->queue_sel
)
391 >> VIRTIO_PCI_QUEUE_ADDR_SHIFT
;
393 case VIRTIO_PCI_QUEUE_NUM
:
394 ret
= virtio_queue_get_num(vdev
, vdev
->queue_sel
);
396 case VIRTIO_PCI_QUEUE_SEL
:
397 ret
= vdev
->queue_sel
;
399 case VIRTIO_PCI_STATUS
:
403 /* reading from the ISR also clears it. */
404 ret
= qatomic_xchg(&vdev
->isr
, 0);
405 pci_irq_deassert(&proxy
->pci_dev
);
407 case VIRTIO_MSI_CONFIG_VECTOR
:
408 ret
= vdev
->config_vector
;
410 case VIRTIO_MSI_QUEUE_VECTOR
:
411 ret
= virtio_queue_vector(vdev
, vdev
->queue_sel
);
420 static uint64_t virtio_pci_config_read(void *opaque
, hwaddr addr
,
423 VirtIOPCIProxy
*proxy
= opaque
;
424 VirtIODevice
*vdev
= virtio_bus_get_device(&proxy
->bus
);
425 uint32_t config
= VIRTIO_PCI_CONFIG_SIZE(&proxy
->pci_dev
);
433 return virtio_ioport_read(proxy
, addr
);
439 val
= virtio_config_readb(vdev
, addr
);
442 val
= virtio_config_readw(vdev
, addr
);
443 if (virtio_is_big_endian(vdev
)) {
448 val
= virtio_config_readl(vdev
, addr
);
449 if (virtio_is_big_endian(vdev
)) {
457 static void virtio_pci_config_write(void *opaque
, hwaddr addr
,
458 uint64_t val
, unsigned size
)
460 VirtIOPCIProxy
*proxy
= opaque
;
461 uint32_t config
= VIRTIO_PCI_CONFIG_SIZE(&proxy
->pci_dev
);
462 VirtIODevice
*vdev
= virtio_bus_get_device(&proxy
->bus
);
469 virtio_ioport_write(proxy
, addr
, val
);
474 * Virtio-PCI is odd. Ioports are LE but config space is target native
479 virtio_config_writeb(vdev
, addr
, val
);
482 if (virtio_is_big_endian(vdev
)) {
485 virtio_config_writew(vdev
, addr
, val
);
488 if (virtio_is_big_endian(vdev
)) {
491 virtio_config_writel(vdev
, addr
, val
);
496 static const MemoryRegionOps virtio_pci_config_ops
= {
497 .read
= virtio_pci_config_read
,
498 .write
= virtio_pci_config_write
,
500 .min_access_size
= 1,
501 .max_access_size
= 4,
503 .endianness
= DEVICE_LITTLE_ENDIAN
,
506 static MemoryRegion
*virtio_address_space_lookup(VirtIOPCIProxy
*proxy
,
507 hwaddr
*off
, int len
)
510 VirtIOPCIRegion
*reg
;
512 for (i
= 0; i
< ARRAY_SIZE(proxy
->regs
); ++i
) {
513 reg
= &proxy
->regs
[i
];
514 if (*off
>= reg
->offset
&&
515 *off
+ len
<= reg
->offset
+ reg
->size
) {
524 /* Below are generic functions to do memcpy from/to an address space,
525 * without byteswaps, with input validation.
527 * As regular address_space_* APIs all do some kind of byteswap at least for
528 * some host/target combinations, we are forced to explicitly convert to a
529 * known-endianness integer value.
530 * It doesn't really matter which endian format to go through, so the code
531 * below selects the endian that causes the least amount of work on the given
534 * Note: host pointer must be aligned.
537 void virtio_address_space_write(VirtIOPCIProxy
*proxy
, hwaddr addr
,
538 const uint8_t *buf
, int len
)
543 /* address_space_* APIs assume an aligned address.
544 * As address is under guest control, handle illegal values.
548 mr
= virtio_address_space_lookup(proxy
, &addr
, len
);
553 /* Make sure caller aligned buf properly */
554 assert(!(((uintptr_t)buf
) & (len
- 1)));
558 val
= pci_get_byte(buf
);
561 val
= pci_get_word(buf
);
564 val
= pci_get_long(buf
);
567 /* As length is under guest control, handle illegal values. */
570 memory_region_dispatch_write(mr
, addr
, val
, size_memop(len
) | MO_LE
,
571 MEMTXATTRS_UNSPECIFIED
);
575 virtio_address_space_read(VirtIOPCIProxy
*proxy
, hwaddr addr
,
576 uint8_t *buf
, int len
)
581 /* address_space_* APIs assume an aligned address.
582 * As address is under guest control, handle illegal values.
586 mr
= virtio_address_space_lookup(proxy
, &addr
, len
);
591 /* Make sure caller aligned buf properly */
592 assert(!(((uintptr_t)buf
) & (len
- 1)));
594 memory_region_dispatch_read(mr
, addr
, &val
, size_memop(len
) | MO_LE
,
595 MEMTXATTRS_UNSPECIFIED
);
598 pci_set_byte(buf
, val
);
601 pci_set_word(buf
, val
);
604 pci_set_long(buf
, val
);
607 /* As length is under guest control, handle illegal values. */
612 static void virtio_write_config(PCIDevice
*pci_dev
, uint32_t address
,
613 uint32_t val
, int len
)
615 VirtIOPCIProxy
*proxy
= VIRTIO_PCI(pci_dev
);
616 VirtIODevice
*vdev
= virtio_bus_get_device(&proxy
->bus
);
617 struct virtio_pci_cfg_cap
*cfg
;
619 pci_default_write_config(pci_dev
, address
, val
, len
);
621 if (proxy
->flags
& VIRTIO_PCI_FLAG_INIT_FLR
) {
622 pcie_cap_flr_write_config(pci_dev
, address
, val
, len
);
625 if (range_covers_byte(address
, len
, PCI_COMMAND
)) {
626 if (!(pci_dev
->config
[PCI_COMMAND
] & PCI_COMMAND_MASTER
)) {
627 virtio_set_disabled(vdev
, true);
628 virtio_pci_stop_ioeventfd(proxy
);
629 virtio_set_status(vdev
, vdev
->status
& ~VIRTIO_CONFIG_S_DRIVER_OK
);
631 virtio_set_disabled(vdev
, false);
635 if (proxy
->config_cap
&&
636 ranges_overlap(address
, len
, proxy
->config_cap
+ offsetof(struct virtio_pci_cfg_cap
,
638 sizeof cfg
->pci_cfg_data
)) {
642 cfg
= (void *)(proxy
->pci_dev
.config
+ proxy
->config_cap
);
643 off
= le32_to_cpu(cfg
->cap
.offset
);
644 len
= le32_to_cpu(cfg
->cap
.length
);
646 if (len
== 1 || len
== 2 || len
== 4) {
647 assert(len
<= sizeof cfg
->pci_cfg_data
);
648 virtio_address_space_write(proxy
, off
, cfg
->pci_cfg_data
, len
);
653 static uint32_t virtio_read_config(PCIDevice
*pci_dev
,
654 uint32_t address
, int len
)
656 VirtIOPCIProxy
*proxy
= VIRTIO_PCI(pci_dev
);
657 struct virtio_pci_cfg_cap
*cfg
;
659 if (proxy
->config_cap
&&
660 ranges_overlap(address
, len
, proxy
->config_cap
+ offsetof(struct virtio_pci_cfg_cap
,
662 sizeof cfg
->pci_cfg_data
)) {
666 cfg
= (void *)(proxy
->pci_dev
.config
+ proxy
->config_cap
);
667 off
= le32_to_cpu(cfg
->cap
.offset
);
668 len
= le32_to_cpu(cfg
->cap
.length
);
670 if (len
== 1 || len
== 2 || len
== 4) {
671 assert(len
<= sizeof cfg
->pci_cfg_data
);
672 virtio_address_space_read(proxy
, off
, cfg
->pci_cfg_data
, len
);
676 return pci_default_read_config(pci_dev
, address
, len
);
679 static int kvm_virtio_pci_vq_vector_use(VirtIOPCIProxy
*proxy
,
680 unsigned int queue_no
,
683 VirtIOIRQFD
*irqfd
= &proxy
->vector_irqfd
[vector
];
686 if (irqfd
->users
== 0) {
687 ret
= kvm_irqchip_add_msi_route(kvm_state
, vector
, &proxy
->pci_dev
);
697 static void kvm_virtio_pci_vq_vector_release(VirtIOPCIProxy
*proxy
,
700 VirtIOIRQFD
*irqfd
= &proxy
->vector_irqfd
[vector
];
701 if (--irqfd
->users
== 0) {
702 kvm_irqchip_release_virq(kvm_state
, irqfd
->virq
);
706 static int kvm_virtio_pci_irqfd_use(VirtIOPCIProxy
*proxy
,
707 unsigned int queue_no
,
710 VirtIOIRQFD
*irqfd
= &proxy
->vector_irqfd
[vector
];
711 VirtIODevice
*vdev
= virtio_bus_get_device(&proxy
->bus
);
712 VirtQueue
*vq
= virtio_get_queue(vdev
, queue_no
);
713 EventNotifier
*n
= virtio_queue_get_guest_notifier(vq
);
714 return kvm_irqchip_add_irqfd_notifier_gsi(kvm_state
, n
, NULL
, irqfd
->virq
);
717 static void kvm_virtio_pci_irqfd_release(VirtIOPCIProxy
*proxy
,
718 unsigned int queue_no
,
721 VirtIODevice
*vdev
= virtio_bus_get_device(&proxy
->bus
);
722 VirtQueue
*vq
= virtio_get_queue(vdev
, queue_no
);
723 EventNotifier
*n
= virtio_queue_get_guest_notifier(vq
);
724 VirtIOIRQFD
*irqfd
= &proxy
->vector_irqfd
[vector
];
727 ret
= kvm_irqchip_remove_irqfd_notifier_gsi(kvm_state
, n
, irqfd
->virq
);
731 static int kvm_virtio_pci_vector_use(VirtIOPCIProxy
*proxy
, int nvqs
)
733 PCIDevice
*dev
= &proxy
->pci_dev
;
734 VirtIODevice
*vdev
= virtio_bus_get_device(&proxy
->bus
);
735 VirtioDeviceClass
*k
= VIRTIO_DEVICE_GET_CLASS(vdev
);
739 for (queue_no
= 0; queue_no
< nvqs
; queue_no
++) {
740 if (!virtio_queue_get_num(vdev
, queue_no
)) {
743 vector
= virtio_queue_vector(vdev
, queue_no
);
744 if (vector
>= msix_nr_vectors_allocated(dev
)) {
747 ret
= kvm_virtio_pci_vq_vector_use(proxy
, queue_no
, vector
);
751 /* If guest supports masking, set up irqfd now.
752 * Otherwise, delay until unmasked in the frontend.
754 if (vdev
->use_guest_notifier_mask
&& k
->guest_notifier_mask
) {
755 ret
= kvm_virtio_pci_irqfd_use(proxy
, queue_no
, vector
);
757 kvm_virtio_pci_vq_vector_release(proxy
, vector
);
765 while (--queue_no
>= 0) {
766 vector
= virtio_queue_vector(vdev
, queue_no
);
767 if (vector
>= msix_nr_vectors_allocated(dev
)) {
770 if (vdev
->use_guest_notifier_mask
&& k
->guest_notifier_mask
) {
771 kvm_virtio_pci_irqfd_release(proxy
, queue_no
, vector
);
773 kvm_virtio_pci_vq_vector_release(proxy
, vector
);
778 static void kvm_virtio_pci_vector_release(VirtIOPCIProxy
*proxy
, int nvqs
)
780 PCIDevice
*dev
= &proxy
->pci_dev
;
781 VirtIODevice
*vdev
= virtio_bus_get_device(&proxy
->bus
);
784 VirtioDeviceClass
*k
= VIRTIO_DEVICE_GET_CLASS(vdev
);
786 for (queue_no
= 0; queue_no
< nvqs
; queue_no
++) {
787 if (!virtio_queue_get_num(vdev
, queue_no
)) {
790 vector
= virtio_queue_vector(vdev
, queue_no
);
791 if (vector
>= msix_nr_vectors_allocated(dev
)) {
794 /* If guest supports masking, clean up irqfd now.
795 * Otherwise, it was cleaned when masked in the frontend.
797 if (vdev
->use_guest_notifier_mask
&& k
->guest_notifier_mask
) {
798 kvm_virtio_pci_irqfd_release(proxy
, queue_no
, vector
);
800 kvm_virtio_pci_vq_vector_release(proxy
, vector
);
804 static int virtio_pci_vq_vector_unmask(VirtIOPCIProxy
*proxy
,
805 unsigned int queue_no
,
809 VirtIODevice
*vdev
= virtio_bus_get_device(&proxy
->bus
);
810 VirtioDeviceClass
*k
= VIRTIO_DEVICE_GET_CLASS(vdev
);
811 VirtQueue
*vq
= virtio_get_queue(vdev
, queue_no
);
812 EventNotifier
*n
= virtio_queue_get_guest_notifier(vq
);
816 if (proxy
->vector_irqfd
) {
817 irqfd
= &proxy
->vector_irqfd
[vector
];
818 if (irqfd
->msg
.data
!= msg
.data
|| irqfd
->msg
.address
!= msg
.address
) {
819 ret
= kvm_irqchip_update_msi_route(kvm_state
, irqfd
->virq
, msg
,
824 kvm_irqchip_commit_routes(kvm_state
);
828 /* If guest supports masking, irqfd is already setup, unmask it.
829 * Otherwise, set it up now.
831 if (vdev
->use_guest_notifier_mask
&& k
->guest_notifier_mask
) {
832 k
->guest_notifier_mask(vdev
, queue_no
, false);
833 /* Test after unmasking to avoid losing events. */
834 if (k
->guest_notifier_pending
&&
835 k
->guest_notifier_pending(vdev
, queue_no
)) {
836 event_notifier_set(n
);
839 ret
= kvm_virtio_pci_irqfd_use(proxy
, queue_no
, vector
);
844 static void virtio_pci_vq_vector_mask(VirtIOPCIProxy
*proxy
,
845 unsigned int queue_no
,
848 VirtIODevice
*vdev
= virtio_bus_get_device(&proxy
->bus
);
849 VirtioDeviceClass
*k
= VIRTIO_DEVICE_GET_CLASS(vdev
);
851 /* If guest supports masking, keep irqfd but mask it.
852 * Otherwise, clean it up now.
854 if (vdev
->use_guest_notifier_mask
&& k
->guest_notifier_mask
) {
855 k
->guest_notifier_mask(vdev
, queue_no
, true);
857 kvm_virtio_pci_irqfd_release(proxy
, queue_no
, vector
);
861 static int virtio_pci_vector_unmask(PCIDevice
*dev
, unsigned vector
,
864 VirtIOPCIProxy
*proxy
= container_of(dev
, VirtIOPCIProxy
, pci_dev
);
865 VirtIODevice
*vdev
= virtio_bus_get_device(&proxy
->bus
);
866 VirtQueue
*vq
= virtio_vector_first_queue(vdev
, vector
);
867 int ret
, index
, unmasked
= 0;
870 index
= virtio_get_queue_index(vq
);
871 if (!virtio_queue_get_num(vdev
, index
)) {
874 if (index
< proxy
->nvqs_with_notifiers
) {
875 ret
= virtio_pci_vq_vector_unmask(proxy
, index
, vector
, msg
);
881 vq
= virtio_vector_next_queue(vq
);
887 vq
= virtio_vector_first_queue(vdev
, vector
);
888 while (vq
&& unmasked
>= 0) {
889 index
= virtio_get_queue_index(vq
);
890 if (index
< proxy
->nvqs_with_notifiers
) {
891 virtio_pci_vq_vector_mask(proxy
, index
, vector
);
894 vq
= virtio_vector_next_queue(vq
);
899 static void virtio_pci_vector_mask(PCIDevice
*dev
, unsigned vector
)
901 VirtIOPCIProxy
*proxy
= container_of(dev
, VirtIOPCIProxy
, pci_dev
);
902 VirtIODevice
*vdev
= virtio_bus_get_device(&proxy
->bus
);
903 VirtQueue
*vq
= virtio_vector_first_queue(vdev
, vector
);
907 index
= virtio_get_queue_index(vq
);
908 if (!virtio_queue_get_num(vdev
, index
)) {
911 if (index
< proxy
->nvqs_with_notifiers
) {
912 virtio_pci_vq_vector_mask(proxy
, index
, vector
);
914 vq
= virtio_vector_next_queue(vq
);
918 static void virtio_pci_vector_poll(PCIDevice
*dev
,
919 unsigned int vector_start
,
920 unsigned int vector_end
)
922 VirtIOPCIProxy
*proxy
= container_of(dev
, VirtIOPCIProxy
, pci_dev
);
923 VirtIODevice
*vdev
= virtio_bus_get_device(&proxy
->bus
);
924 VirtioDeviceClass
*k
= VIRTIO_DEVICE_GET_CLASS(vdev
);
927 EventNotifier
*notifier
;
930 for (queue_no
= 0; queue_no
< proxy
->nvqs_with_notifiers
; queue_no
++) {
931 if (!virtio_queue_get_num(vdev
, queue_no
)) {
934 vector
= virtio_queue_vector(vdev
, queue_no
);
935 if (vector
< vector_start
|| vector
>= vector_end
||
936 !msix_is_masked(dev
, vector
)) {
939 vq
= virtio_get_queue(vdev
, queue_no
);
940 notifier
= virtio_queue_get_guest_notifier(vq
);
941 if (k
->guest_notifier_pending
) {
942 if (k
->guest_notifier_pending(vdev
, queue_no
)) {
943 msix_set_pending(dev
, vector
);
945 } else if (event_notifier_test_and_clear(notifier
)) {
946 msix_set_pending(dev
, vector
);
951 static int virtio_pci_set_guest_notifier(DeviceState
*d
, int n
, bool assign
,
954 VirtIOPCIProxy
*proxy
= to_virtio_pci_proxy(d
);
955 VirtIODevice
*vdev
= virtio_bus_get_device(&proxy
->bus
);
956 VirtioDeviceClass
*vdc
= VIRTIO_DEVICE_GET_CLASS(vdev
);
957 VirtQueue
*vq
= virtio_get_queue(vdev
, n
);
958 EventNotifier
*notifier
= virtio_queue_get_guest_notifier(vq
);
961 int r
= event_notifier_init(notifier
, 0);
965 virtio_queue_set_guest_notifier_fd_handler(vq
, true, with_irqfd
);
967 virtio_queue_set_guest_notifier_fd_handler(vq
, false, with_irqfd
);
968 event_notifier_cleanup(notifier
);
971 if (!msix_enabled(&proxy
->pci_dev
) &&
972 vdev
->use_guest_notifier_mask
&&
973 vdc
->guest_notifier_mask
) {
974 vdc
->guest_notifier_mask(vdev
, n
, !assign
);
980 static bool virtio_pci_query_guest_notifiers(DeviceState
*d
)
982 VirtIOPCIProxy
*proxy
= to_virtio_pci_proxy(d
);
983 return msix_enabled(&proxy
->pci_dev
);
986 static int virtio_pci_set_guest_notifiers(DeviceState
*d
, int nvqs
, bool assign
)
988 VirtIOPCIProxy
*proxy
= to_virtio_pci_proxy(d
);
989 VirtIODevice
*vdev
= virtio_bus_get_device(&proxy
->bus
);
990 VirtioDeviceClass
*k
= VIRTIO_DEVICE_GET_CLASS(vdev
);
992 bool with_irqfd
= msix_enabled(&proxy
->pci_dev
) &&
993 kvm_msi_via_irqfd_enabled();
995 nvqs
= MIN(nvqs
, VIRTIO_QUEUE_MAX
);
997 /* When deassigning, pass a consistent nvqs value
998 * to avoid leaking notifiers.
1000 assert(assign
|| nvqs
== proxy
->nvqs_with_notifiers
);
1002 proxy
->nvqs_with_notifiers
= nvqs
;
1004 /* Must unset vector notifier while guest notifier is still assigned */
1005 if ((proxy
->vector_irqfd
|| k
->guest_notifier_mask
) && !assign
) {
1006 msix_unset_vector_notifiers(&proxy
->pci_dev
);
1007 if (proxy
->vector_irqfd
) {
1008 kvm_virtio_pci_vector_release(proxy
, nvqs
);
1009 g_free(proxy
->vector_irqfd
);
1010 proxy
->vector_irqfd
= NULL
;
1014 for (n
= 0; n
< nvqs
; n
++) {
1015 if (!virtio_queue_get_num(vdev
, n
)) {
1019 r
= virtio_pci_set_guest_notifier(d
, n
, assign
, with_irqfd
);
1025 /* Must set vector notifier after guest notifier has been assigned */
1026 if ((with_irqfd
|| k
->guest_notifier_mask
) && assign
) {
1028 proxy
->vector_irqfd
=
1029 g_malloc0(sizeof(*proxy
->vector_irqfd
) *
1030 msix_nr_vectors_allocated(&proxy
->pci_dev
));
1031 r
= kvm_virtio_pci_vector_use(proxy
, nvqs
);
1036 r
= msix_set_vector_notifiers(&proxy
->pci_dev
,
1037 virtio_pci_vector_unmask
,
1038 virtio_pci_vector_mask
,
1039 virtio_pci_vector_poll
);
1041 goto notifiers_error
;
1050 kvm_virtio_pci_vector_release(proxy
, nvqs
);
1054 /* We get here on assignment failure. Recover by undoing for VQs 0 .. n. */
1057 virtio_pci_set_guest_notifier(d
, n
, !assign
, with_irqfd
);
1062 static int virtio_pci_set_host_notifier_mr(DeviceState
*d
, int n
,
1063 MemoryRegion
*mr
, bool assign
)
1065 VirtIOPCIProxy
*proxy
= to_virtio_pci_proxy(d
);
1068 if (n
>= VIRTIO_QUEUE_MAX
|| !virtio_pci_modern(proxy
) ||
1069 virtio_pci_queue_mem_mult(proxy
) != memory_region_size(mr
)) {
1074 offset
= virtio_pci_queue_mem_mult(proxy
) * n
;
1075 memory_region_add_subregion_overlap(&proxy
->notify
.mr
, offset
, mr
, 1);
1077 memory_region_del_subregion(&proxy
->notify
.mr
, mr
);
1083 static void virtio_pci_vmstate_change(DeviceState
*d
, bool running
)
1085 VirtIOPCIProxy
*proxy
= to_virtio_pci_proxy(d
);
1086 VirtIODevice
*vdev
= virtio_bus_get_device(&proxy
->bus
);
1089 /* Old QEMU versions did not set bus master enable on status write.
1090 * Detect DRIVER set and enable it.
1092 if ((proxy
->flags
& VIRTIO_PCI_FLAG_BUS_MASTER_BUG_MIGRATION
) &&
1093 (vdev
->status
& VIRTIO_CONFIG_S_DRIVER
) &&
1094 !(proxy
->pci_dev
.config
[PCI_COMMAND
] & PCI_COMMAND_MASTER
)) {
1095 pci_default_write_config(&proxy
->pci_dev
, PCI_COMMAND
,
1096 proxy
->pci_dev
.config
[PCI_COMMAND
] |
1097 PCI_COMMAND_MASTER
, 1);
1099 virtio_pci_start_ioeventfd(proxy
);
1101 virtio_pci_stop_ioeventfd(proxy
);
1106 * virtio-pci: This is the PCIDevice which has a virtio-pci-bus.
1109 static int virtio_pci_query_nvectors(DeviceState
*d
)
1111 VirtIOPCIProxy
*proxy
= VIRTIO_PCI(d
);
1113 return proxy
->nvectors
;
1116 static AddressSpace
*virtio_pci_get_dma_as(DeviceState
*d
)
1118 VirtIOPCIProxy
*proxy
= VIRTIO_PCI(d
);
1119 PCIDevice
*dev
= &proxy
->pci_dev
;
1121 return pci_get_address_space(dev
);
1124 static bool virtio_pci_iommu_enabled(DeviceState
*d
)
1126 VirtIOPCIProxy
*proxy
= VIRTIO_PCI(d
);
1127 PCIDevice
*dev
= &proxy
->pci_dev
;
1128 AddressSpace
*dma_as
= pci_device_iommu_address_space(dev
);
1130 if (dma_as
== &address_space_memory
) {
1137 static bool virtio_pci_queue_enabled(DeviceState
*d
, int n
)
1139 VirtIOPCIProxy
*proxy
= VIRTIO_PCI(d
);
1140 VirtIODevice
*vdev
= virtio_bus_get_device(&proxy
->bus
);
1142 if (virtio_vdev_has_feature(vdev
, VIRTIO_F_VERSION_1
)) {
1143 return proxy
->vqs
[n
].enabled
;
1146 return virtio_queue_enabled_legacy(vdev
, n
);
1149 static int virtio_pci_add_mem_cap(VirtIOPCIProxy
*proxy
,
1150 struct virtio_pci_cap
*cap
)
1152 PCIDevice
*dev
= &proxy
->pci_dev
;
1155 offset
= pci_add_capability(dev
, PCI_CAP_ID_VNDR
, 0,
1156 cap
->cap_len
, &error_abort
);
1158 assert(cap
->cap_len
>= sizeof *cap
);
1159 memcpy(dev
->config
+ offset
+ PCI_CAP_FLAGS
, &cap
->cap_len
,
1160 cap
->cap_len
- PCI_CAP_FLAGS
);
1165 static uint64_t virtio_pci_common_read(void *opaque
, hwaddr addr
,
1168 VirtIOPCIProxy
*proxy
= opaque
;
1169 VirtIODevice
*vdev
= virtio_bus_get_device(&proxy
->bus
);
1178 case VIRTIO_PCI_COMMON_DFSELECT
:
1179 val
= proxy
->dfselect
;
1181 case VIRTIO_PCI_COMMON_DF
:
1182 if (proxy
->dfselect
<= 1) {
1183 VirtioDeviceClass
*vdc
= VIRTIO_DEVICE_GET_CLASS(vdev
);
1185 val
= (vdev
->host_features
& ~vdc
->legacy_features
) >>
1186 (32 * proxy
->dfselect
);
1189 case VIRTIO_PCI_COMMON_GFSELECT
:
1190 val
= proxy
->gfselect
;
1192 case VIRTIO_PCI_COMMON_GF
:
1193 if (proxy
->gfselect
< ARRAY_SIZE(proxy
->guest_features
)) {
1194 val
= proxy
->guest_features
[proxy
->gfselect
];
1197 case VIRTIO_PCI_COMMON_MSIX
:
1198 val
= vdev
->config_vector
;
1200 case VIRTIO_PCI_COMMON_NUMQ
:
1201 for (i
= 0; i
< VIRTIO_QUEUE_MAX
; ++i
) {
1202 if (virtio_queue_get_num(vdev
, i
)) {
1207 case VIRTIO_PCI_COMMON_STATUS
:
1210 case VIRTIO_PCI_COMMON_CFGGENERATION
:
1211 val
= vdev
->generation
;
1213 case VIRTIO_PCI_COMMON_Q_SELECT
:
1214 val
= vdev
->queue_sel
;
1216 case VIRTIO_PCI_COMMON_Q_SIZE
:
1217 val
= virtio_queue_get_num(vdev
, vdev
->queue_sel
);
1219 case VIRTIO_PCI_COMMON_Q_MSIX
:
1220 val
= virtio_queue_vector(vdev
, vdev
->queue_sel
);
1222 case VIRTIO_PCI_COMMON_Q_ENABLE
:
1223 val
= proxy
->vqs
[vdev
->queue_sel
].enabled
;
1225 case VIRTIO_PCI_COMMON_Q_NOFF
:
1226 /* Simply map queues in order */
1227 val
= vdev
->queue_sel
;
1229 case VIRTIO_PCI_COMMON_Q_DESCLO
:
1230 val
= proxy
->vqs
[vdev
->queue_sel
].desc
[0];
1232 case VIRTIO_PCI_COMMON_Q_DESCHI
:
1233 val
= proxy
->vqs
[vdev
->queue_sel
].desc
[1];
1235 case VIRTIO_PCI_COMMON_Q_AVAILLO
:
1236 val
= proxy
->vqs
[vdev
->queue_sel
].avail
[0];
1238 case VIRTIO_PCI_COMMON_Q_AVAILHI
:
1239 val
= proxy
->vqs
[vdev
->queue_sel
].avail
[1];
1241 case VIRTIO_PCI_COMMON_Q_USEDLO
:
1242 val
= proxy
->vqs
[vdev
->queue_sel
].used
[0];
1244 case VIRTIO_PCI_COMMON_Q_USEDHI
:
1245 val
= proxy
->vqs
[vdev
->queue_sel
].used
[1];
1254 static void virtio_pci_common_write(void *opaque
, hwaddr addr
,
1255 uint64_t val
, unsigned size
)
1257 VirtIOPCIProxy
*proxy
= opaque
;
1258 VirtIODevice
*vdev
= virtio_bus_get_device(&proxy
->bus
);
1265 case VIRTIO_PCI_COMMON_DFSELECT
:
1266 proxy
->dfselect
= val
;
1268 case VIRTIO_PCI_COMMON_GFSELECT
:
1269 proxy
->gfselect
= val
;
1271 case VIRTIO_PCI_COMMON_GF
:
1272 if (proxy
->gfselect
< ARRAY_SIZE(proxy
->guest_features
)) {
1273 proxy
->guest_features
[proxy
->gfselect
] = val
;
1274 virtio_set_features(vdev
,
1275 (((uint64_t)proxy
->guest_features
[1]) << 32) |
1276 proxy
->guest_features
[0]);
1279 case VIRTIO_PCI_COMMON_MSIX
:
1280 msix_vector_unuse(&proxy
->pci_dev
, vdev
->config_vector
);
1281 /* Make it possible for guest to discover an error took place. */
1282 if (msix_vector_use(&proxy
->pci_dev
, val
) < 0) {
1283 val
= VIRTIO_NO_VECTOR
;
1285 vdev
->config_vector
= val
;
1287 case VIRTIO_PCI_COMMON_STATUS
:
1288 if (!(val
& VIRTIO_CONFIG_S_DRIVER_OK
)) {
1289 virtio_pci_stop_ioeventfd(proxy
);
1292 virtio_set_status(vdev
, val
& 0xFF);
1294 if (val
& VIRTIO_CONFIG_S_DRIVER_OK
) {
1295 virtio_pci_start_ioeventfd(proxy
);
1298 if (vdev
->status
== 0) {
1299 virtio_pci_reset(DEVICE(proxy
));
1303 case VIRTIO_PCI_COMMON_Q_SELECT
:
1304 if (val
< VIRTIO_QUEUE_MAX
) {
1305 vdev
->queue_sel
= val
;
1308 case VIRTIO_PCI_COMMON_Q_SIZE
:
1309 proxy
->vqs
[vdev
->queue_sel
].num
= val
;
1310 virtio_queue_set_num(vdev
, vdev
->queue_sel
,
1311 proxy
->vqs
[vdev
->queue_sel
].num
);
1313 case VIRTIO_PCI_COMMON_Q_MSIX
:
1314 msix_vector_unuse(&proxy
->pci_dev
,
1315 virtio_queue_vector(vdev
, vdev
->queue_sel
));
1316 /* Make it possible for guest to discover an error took place. */
1317 if (msix_vector_use(&proxy
->pci_dev
, val
) < 0) {
1318 val
= VIRTIO_NO_VECTOR
;
1320 virtio_queue_set_vector(vdev
, vdev
->queue_sel
, val
);
1322 case VIRTIO_PCI_COMMON_Q_ENABLE
:
1324 virtio_queue_set_num(vdev
, vdev
->queue_sel
,
1325 proxy
->vqs
[vdev
->queue_sel
].num
);
1326 virtio_queue_set_rings(vdev
, vdev
->queue_sel
,
1327 ((uint64_t)proxy
->vqs
[vdev
->queue_sel
].desc
[1]) << 32 |
1328 proxy
->vqs
[vdev
->queue_sel
].desc
[0],
1329 ((uint64_t)proxy
->vqs
[vdev
->queue_sel
].avail
[1]) << 32 |
1330 proxy
->vqs
[vdev
->queue_sel
].avail
[0],
1331 ((uint64_t)proxy
->vqs
[vdev
->queue_sel
].used
[1]) << 32 |
1332 proxy
->vqs
[vdev
->queue_sel
].used
[0]);
1333 proxy
->vqs
[vdev
->queue_sel
].enabled
= 1;
1335 virtio_error(vdev
, "wrong value for queue_enable %"PRIx64
, val
);
1338 case VIRTIO_PCI_COMMON_Q_DESCLO
:
1339 proxy
->vqs
[vdev
->queue_sel
].desc
[0] = val
;
1341 case VIRTIO_PCI_COMMON_Q_DESCHI
:
1342 proxy
->vqs
[vdev
->queue_sel
].desc
[1] = val
;
1344 case VIRTIO_PCI_COMMON_Q_AVAILLO
:
1345 proxy
->vqs
[vdev
->queue_sel
].avail
[0] = val
;
1347 case VIRTIO_PCI_COMMON_Q_AVAILHI
:
1348 proxy
->vqs
[vdev
->queue_sel
].avail
[1] = val
;
1350 case VIRTIO_PCI_COMMON_Q_USEDLO
:
1351 proxy
->vqs
[vdev
->queue_sel
].used
[0] = val
;
1353 case VIRTIO_PCI_COMMON_Q_USEDHI
:
1354 proxy
->vqs
[vdev
->queue_sel
].used
[1] = val
;
1362 static uint64_t virtio_pci_notify_read(void *opaque
, hwaddr addr
,
1365 VirtIOPCIProxy
*proxy
= opaque
;
1366 if (virtio_bus_get_device(&proxy
->bus
) == NULL
) {
1373 static void virtio_pci_notify_write(void *opaque
, hwaddr addr
,
1374 uint64_t val
, unsigned size
)
1376 VirtIOPCIProxy
*proxy
= opaque
;
1377 VirtIODevice
*vdev
= virtio_bus_get_device(&proxy
->bus
);
1379 unsigned queue
= addr
/ virtio_pci_queue_mem_mult(proxy
);
1381 if (vdev
!= NULL
&& queue
< VIRTIO_QUEUE_MAX
) {
1382 virtio_queue_notify(vdev
, queue
);
1386 static void virtio_pci_notify_write_pio(void *opaque
, hwaddr addr
,
1387 uint64_t val
, unsigned size
)
1389 VirtIOPCIProxy
*proxy
= opaque
;
1390 VirtIODevice
*vdev
= virtio_bus_get_device(&proxy
->bus
);
1392 unsigned queue
= val
;
1394 if (vdev
!= NULL
&& queue
< VIRTIO_QUEUE_MAX
) {
1395 virtio_queue_notify(vdev
, queue
);
1399 static uint64_t virtio_pci_isr_read(void *opaque
, hwaddr addr
,
1402 VirtIOPCIProxy
*proxy
= opaque
;
1403 VirtIODevice
*vdev
= virtio_bus_get_device(&proxy
->bus
);
1410 val
= qatomic_xchg(&vdev
->isr
, 0);
1411 pci_irq_deassert(&proxy
->pci_dev
);
1415 static void virtio_pci_isr_write(void *opaque
, hwaddr addr
,
1416 uint64_t val
, unsigned size
)
1420 static uint64_t virtio_pci_device_read(void *opaque
, hwaddr addr
,
1423 VirtIOPCIProxy
*proxy
= opaque
;
1424 VirtIODevice
*vdev
= virtio_bus_get_device(&proxy
->bus
);
1433 val
= virtio_config_modern_readb(vdev
, addr
);
1436 val
= virtio_config_modern_readw(vdev
, addr
);
1439 val
= virtio_config_modern_readl(vdev
, addr
);
1448 static void virtio_pci_device_write(void *opaque
, hwaddr addr
,
1449 uint64_t val
, unsigned size
)
1451 VirtIOPCIProxy
*proxy
= opaque
;
1452 VirtIODevice
*vdev
= virtio_bus_get_device(&proxy
->bus
);
1460 virtio_config_modern_writeb(vdev
, addr
, val
);
1463 virtio_config_modern_writew(vdev
, addr
, val
);
1466 virtio_config_modern_writel(vdev
, addr
, val
);
1471 static void virtio_pci_modern_regions_init(VirtIOPCIProxy
*proxy
,
1472 const char *vdev_name
)
1474 static const MemoryRegionOps common_ops
= {
1475 .read
= virtio_pci_common_read
,
1476 .write
= virtio_pci_common_write
,
1478 .min_access_size
= 1,
1479 .max_access_size
= 4,
1481 .endianness
= DEVICE_LITTLE_ENDIAN
,
1483 static const MemoryRegionOps isr_ops
= {
1484 .read
= virtio_pci_isr_read
,
1485 .write
= virtio_pci_isr_write
,
1487 .min_access_size
= 1,
1488 .max_access_size
= 4,
1490 .endianness
= DEVICE_LITTLE_ENDIAN
,
1492 static const MemoryRegionOps device_ops
= {
1493 .read
= virtio_pci_device_read
,
1494 .write
= virtio_pci_device_write
,
1496 .min_access_size
= 1,
1497 .max_access_size
= 4,
1499 .endianness
= DEVICE_LITTLE_ENDIAN
,
1501 static const MemoryRegionOps notify_ops
= {
1502 .read
= virtio_pci_notify_read
,
1503 .write
= virtio_pci_notify_write
,
1505 .min_access_size
= 1,
1506 .max_access_size
= 4,
1508 .endianness
= DEVICE_LITTLE_ENDIAN
,
1510 static const MemoryRegionOps notify_pio_ops
= {
1511 .read
= virtio_pci_notify_read
,
1512 .write
= virtio_pci_notify_write_pio
,
1514 .min_access_size
= 1,
1515 .max_access_size
= 4,
1517 .endianness
= DEVICE_LITTLE_ENDIAN
,
1519 g_autoptr(GString
) name
= g_string_new(NULL
);
1521 g_string_printf(name
, "virtio-pci-common-%s", vdev_name
);
1522 memory_region_init_io(&proxy
->common
.mr
, OBJECT(proxy
),
1526 proxy
->common
.size
);
1528 g_string_printf(name
, "virtio-pci-isr-%s", vdev_name
);
1529 memory_region_init_io(&proxy
->isr
.mr
, OBJECT(proxy
),
1535 g_string_printf(name
, "virtio-pci-device-%s", vdev_name
);
1536 memory_region_init_io(&proxy
->device
.mr
, OBJECT(proxy
),
1540 proxy
->device
.size
);
1542 g_string_printf(name
, "virtio-pci-notify-%s", vdev_name
);
1543 memory_region_init_io(&proxy
->notify
.mr
, OBJECT(proxy
),
1547 proxy
->notify
.size
);
1549 g_string_printf(name
, "virtio-pci-notify-pio-%s", vdev_name
);
1550 memory_region_init_io(&proxy
->notify_pio
.mr
, OBJECT(proxy
),
1554 proxy
->notify_pio
.size
);
1557 static void virtio_pci_modern_region_map(VirtIOPCIProxy
*proxy
,
1558 VirtIOPCIRegion
*region
,
1559 struct virtio_pci_cap
*cap
,
1563 memory_region_add_subregion(mr
, region
->offset
, ®ion
->mr
);
1565 cap
->cfg_type
= region
->type
;
1567 cap
->offset
= cpu_to_le32(region
->offset
);
1568 cap
->length
= cpu_to_le32(region
->size
);
1569 virtio_pci_add_mem_cap(proxy
, cap
);
1573 static void virtio_pci_modern_mem_region_map(VirtIOPCIProxy
*proxy
,
1574 VirtIOPCIRegion
*region
,
1575 struct virtio_pci_cap
*cap
)
1577 virtio_pci_modern_region_map(proxy
, region
, cap
,
1578 &proxy
->modern_bar
, proxy
->modern_mem_bar_idx
);
1581 static void virtio_pci_modern_io_region_map(VirtIOPCIProxy
*proxy
,
1582 VirtIOPCIRegion
*region
,
1583 struct virtio_pci_cap
*cap
)
1585 virtio_pci_modern_region_map(proxy
, region
, cap
,
1586 &proxy
->io_bar
, proxy
->modern_io_bar_idx
);
1589 static void virtio_pci_modern_mem_region_unmap(VirtIOPCIProxy
*proxy
,
1590 VirtIOPCIRegion
*region
)
1592 memory_region_del_subregion(&proxy
->modern_bar
,
1596 static void virtio_pci_modern_io_region_unmap(VirtIOPCIProxy
*proxy
,
1597 VirtIOPCIRegion
*region
)
1599 memory_region_del_subregion(&proxy
->io_bar
,
1603 static void virtio_pci_pre_plugged(DeviceState
*d
, Error
**errp
)
1605 VirtIOPCIProxy
*proxy
= VIRTIO_PCI(d
);
1606 VirtIODevice
*vdev
= virtio_bus_get_device(&proxy
->bus
);
1608 if (virtio_pci_modern(proxy
)) {
1609 virtio_add_feature(&vdev
->host_features
, VIRTIO_F_VERSION_1
);
1612 virtio_add_feature(&vdev
->host_features
, VIRTIO_F_BAD_FEATURE
);
1615 /* This is called by virtio-bus just after the device is plugged. */
1616 static void virtio_pci_device_plugged(DeviceState
*d
, Error
**errp
)
1618 VirtIOPCIProxy
*proxy
= VIRTIO_PCI(d
);
1619 VirtioBusState
*bus
= &proxy
->bus
;
1620 bool legacy
= virtio_pci_legacy(proxy
);
1622 bool modern_pio
= proxy
->flags
& VIRTIO_PCI_FLAG_MODERN_PIO_NOTIFY
;
1625 VirtIODevice
*vdev
= virtio_bus_get_device(&proxy
->bus
);
1628 * Virtio capabilities present without
1629 * VIRTIO_F_VERSION_1 confuses guests
1631 if (!proxy
->ignore_backend_features
&&
1632 !virtio_has_feature(vdev
->host_features
, VIRTIO_F_VERSION_1
)) {
1633 virtio_pci_disable_modern(proxy
);
1636 error_setg(errp
, "Device doesn't support modern mode, and legacy"
1637 " mode is disabled");
1638 error_append_hint(errp
, "Set disable-legacy to off\n");
1644 modern
= virtio_pci_modern(proxy
);
1646 config
= proxy
->pci_dev
.config
;
1647 if (proxy
->class_code
) {
1648 pci_config_set_class(config
, proxy
->class_code
);
1652 if (!virtio_legacy_allowed(vdev
)) {
1654 * To avoid migration issues, we allow legacy mode when legacy
1655 * check is disabled in the old machine types (< 5.1).
1657 if (virtio_legacy_check_disabled(vdev
)) {
1658 warn_report("device is modern-only, but for backward "
1659 "compatibility legacy is allowed");
1662 "device is modern-only, use disable-legacy=on");
1666 if (virtio_host_has_feature(vdev
, VIRTIO_F_IOMMU_PLATFORM
)) {
1667 error_setg(errp
, "VIRTIO_F_IOMMU_PLATFORM was supported by"
1668 " neither legacy nor transitional device");
1672 * Legacy and transitional devices use specific subsystem IDs.
1673 * Note that the subsystem vendor ID (config + PCI_SUBSYSTEM_VENDOR_ID)
1674 * is set to PCI_SUBVENDOR_ID_REDHAT_QUMRANET by default.
1676 pci_set_word(config
+ PCI_SUBSYSTEM_ID
, virtio_bus_get_vdev_id(bus
));
1678 /* pure virtio-1.0 */
1679 pci_set_word(config
+ PCI_VENDOR_ID
,
1680 PCI_VENDOR_ID_REDHAT_QUMRANET
);
1681 pci_set_word(config
+ PCI_DEVICE_ID
,
1682 0x1040 + virtio_bus_get_vdev_id(bus
));
1683 pci_config_set_revision(config
, 1);
1685 config
[PCI_INTERRUPT_PIN
] = 1;
1689 struct virtio_pci_cap cap
= {
1690 .cap_len
= sizeof cap
,
1692 struct virtio_pci_notify_cap notify
= {
1693 .cap
.cap_len
= sizeof notify
,
1694 .notify_off_multiplier
=
1695 cpu_to_le32(virtio_pci_queue_mem_mult(proxy
)),
1697 struct virtio_pci_cfg_cap cfg
= {
1698 .cap
.cap_len
= sizeof cfg
,
1699 .cap
.cfg_type
= VIRTIO_PCI_CAP_PCI_CFG
,
1701 struct virtio_pci_notify_cap notify_pio
= {
1702 .cap
.cap_len
= sizeof notify
,
1703 .notify_off_multiplier
= cpu_to_le32(0x0),
1706 struct virtio_pci_cfg_cap
*cfg_mask
;
1708 virtio_pci_modern_regions_init(proxy
, vdev
->name
);
1710 virtio_pci_modern_mem_region_map(proxy
, &proxy
->common
, &cap
);
1711 virtio_pci_modern_mem_region_map(proxy
, &proxy
->isr
, &cap
);
1712 virtio_pci_modern_mem_region_map(proxy
, &proxy
->device
, &cap
);
1713 virtio_pci_modern_mem_region_map(proxy
, &proxy
->notify
, ¬ify
.cap
);
1716 memory_region_init(&proxy
->io_bar
, OBJECT(proxy
),
1717 "virtio-pci-io", 0x4);
1719 pci_register_bar(&proxy
->pci_dev
, proxy
->modern_io_bar_idx
,
1720 PCI_BASE_ADDRESS_SPACE_IO
, &proxy
->io_bar
);
1722 virtio_pci_modern_io_region_map(proxy
, &proxy
->notify_pio
,
1726 pci_register_bar(&proxy
->pci_dev
, proxy
->modern_mem_bar_idx
,
1727 PCI_BASE_ADDRESS_SPACE_MEMORY
|
1728 PCI_BASE_ADDRESS_MEM_PREFETCH
|
1729 PCI_BASE_ADDRESS_MEM_TYPE_64
,
1730 &proxy
->modern_bar
);
1732 proxy
->config_cap
= virtio_pci_add_mem_cap(proxy
, &cfg
.cap
);
1733 cfg_mask
= (void *)(proxy
->pci_dev
.wmask
+ proxy
->config_cap
);
1734 pci_set_byte(&cfg_mask
->cap
.bar
, ~0x0);
1735 pci_set_long((uint8_t *)&cfg_mask
->cap
.offset
, ~0x0);
1736 pci_set_long((uint8_t *)&cfg_mask
->cap
.length
, ~0x0);
1737 pci_set_long(cfg_mask
->pci_cfg_data
, ~0x0);
1740 if (proxy
->nvectors
) {
1741 int err
= msix_init_exclusive_bar(&proxy
->pci_dev
, proxy
->nvectors
,
1742 proxy
->msix_bar_idx
, NULL
);
1744 /* Notice when a system that supports MSIx can't initialize it */
1745 if (err
!= -ENOTSUP
) {
1746 warn_report("unable to init msix vectors to %" PRIu32
,
1749 proxy
->nvectors
= 0;
1753 proxy
->pci_dev
.config_write
= virtio_write_config
;
1754 proxy
->pci_dev
.config_read
= virtio_read_config
;
1757 size
= VIRTIO_PCI_REGION_SIZE(&proxy
->pci_dev
)
1758 + virtio_bus_get_vdev_config_len(bus
);
1759 size
= pow2ceil(size
);
1761 memory_region_init_io(&proxy
->bar
, OBJECT(proxy
),
1762 &virtio_pci_config_ops
,
1763 proxy
, "virtio-pci", size
);
1765 pci_register_bar(&proxy
->pci_dev
, proxy
->legacy_io_bar_idx
,
1766 PCI_BASE_ADDRESS_SPACE_IO
, &proxy
->bar
);
1770 static void virtio_pci_device_unplugged(DeviceState
*d
)
1772 VirtIOPCIProxy
*proxy
= VIRTIO_PCI(d
);
1773 bool modern
= virtio_pci_modern(proxy
);
1774 bool modern_pio
= proxy
->flags
& VIRTIO_PCI_FLAG_MODERN_PIO_NOTIFY
;
1776 virtio_pci_stop_ioeventfd(proxy
);
1779 virtio_pci_modern_mem_region_unmap(proxy
, &proxy
->common
);
1780 virtio_pci_modern_mem_region_unmap(proxy
, &proxy
->isr
);
1781 virtio_pci_modern_mem_region_unmap(proxy
, &proxy
->device
);
1782 virtio_pci_modern_mem_region_unmap(proxy
, &proxy
->notify
);
1784 virtio_pci_modern_io_region_unmap(proxy
, &proxy
->notify_pio
);
1789 static void virtio_pci_realize(PCIDevice
*pci_dev
, Error
**errp
)
1791 VirtIOPCIProxy
*proxy
= VIRTIO_PCI(pci_dev
);
1792 VirtioPCIClass
*k
= VIRTIO_PCI_GET_CLASS(pci_dev
);
1793 bool pcie_port
= pci_bus_is_express(pci_get_bus(pci_dev
)) &&
1794 !pci_bus_is_root(pci_get_bus(pci_dev
));
1796 if (kvm_enabled() && !kvm_has_many_ioeventfds()) {
1797 proxy
->flags
&= ~VIRTIO_PCI_FLAG_USE_IOEVENTFD
;
1800 /* fd-based ioevents can't be synchronized in record/replay */
1801 if (replay_mode
!= REPLAY_MODE_NONE
) {
1802 proxy
->flags
&= ~VIRTIO_PCI_FLAG_USE_IOEVENTFD
;
1806 * virtio pci bar layout used by default.
1807 * subclasses can re-arrange things if needed.
1809 * region 0 -- virtio legacy io bar
1810 * region 1 -- msi-x bar
1811 * region 2 -- virtio modern io bar (off by default)
1812 * region 4+5 -- virtio modern memory (64bit) bar
1815 proxy
->legacy_io_bar_idx
= 0;
1816 proxy
->msix_bar_idx
= 1;
1817 proxy
->modern_io_bar_idx
= 2;
1818 proxy
->modern_mem_bar_idx
= 4;
1820 proxy
->common
.offset
= 0x0;
1821 proxy
->common
.size
= 0x1000;
1822 proxy
->common
.type
= VIRTIO_PCI_CAP_COMMON_CFG
;
1824 proxy
->isr
.offset
= 0x1000;
1825 proxy
->isr
.size
= 0x1000;
1826 proxy
->isr
.type
= VIRTIO_PCI_CAP_ISR_CFG
;
1828 proxy
->device
.offset
= 0x2000;
1829 proxy
->device
.size
= 0x1000;
1830 proxy
->device
.type
= VIRTIO_PCI_CAP_DEVICE_CFG
;
1832 proxy
->notify
.offset
= 0x3000;
1833 proxy
->notify
.size
= virtio_pci_queue_mem_mult(proxy
) * VIRTIO_QUEUE_MAX
;
1834 proxy
->notify
.type
= VIRTIO_PCI_CAP_NOTIFY_CFG
;
1836 proxy
->notify_pio
.offset
= 0x0;
1837 proxy
->notify_pio
.size
= 0x4;
1838 proxy
->notify_pio
.type
= VIRTIO_PCI_CAP_NOTIFY_CFG
;
1840 /* subclasses can enforce modern, so do this unconditionally */
1841 memory_region_init(&proxy
->modern_bar
, OBJECT(proxy
), "virtio-pci",
1842 /* PCI BAR regions must be powers of 2 */
1843 pow2ceil(proxy
->notify
.offset
+ proxy
->notify
.size
));
1845 if (proxy
->disable_legacy
== ON_OFF_AUTO_AUTO
) {
1846 proxy
->disable_legacy
= pcie_port
? ON_OFF_AUTO_ON
: ON_OFF_AUTO_OFF
;
1849 if (!virtio_pci_modern(proxy
) && !virtio_pci_legacy(proxy
)) {
1850 error_setg(errp
, "device cannot work as neither modern nor legacy mode"
1852 error_append_hint(errp
, "Set either disable-modern or disable-legacy"
1857 if (pcie_port
&& pci_is_express(pci_dev
)) {
1859 uint16_t last_pcie_cap_offset
= PCI_CONFIG_SPACE_SIZE
;
1861 pos
= pcie_endpoint_cap_init(pci_dev
, 0);
1864 pos
= pci_add_capability(pci_dev
, PCI_CAP_ID_PM
, 0,
1865 PCI_PM_SIZEOF
, errp
);
1870 pci_dev
->exp
.pm_cap
= pos
;
1873 * Indicates that this function complies with revision 1.2 of the
1874 * PCI Power Management Interface Specification.
1876 pci_set_word(pci_dev
->config
+ pos
+ PCI_PM_PMC
, 0x3);
1878 if (proxy
->flags
& VIRTIO_PCI_FLAG_AER
) {
1879 pcie_aer_init(pci_dev
, PCI_ERR_VER
, last_pcie_cap_offset
,
1880 PCI_ERR_SIZEOF
, NULL
);
1881 last_pcie_cap_offset
+= PCI_ERR_SIZEOF
;
1884 if (proxy
->flags
& VIRTIO_PCI_FLAG_INIT_DEVERR
) {
1885 /* Init error enabling flags */
1886 pcie_cap_deverr_init(pci_dev
);
1889 if (proxy
->flags
& VIRTIO_PCI_FLAG_INIT_LNKCTL
) {
1890 /* Init Link Control Register */
1891 pcie_cap_lnkctl_init(pci_dev
);
1894 if (proxy
->flags
& VIRTIO_PCI_FLAG_INIT_PM
) {
1895 /* Init Power Management Control Register */
1896 pci_set_word(pci_dev
->wmask
+ pos
+ PCI_PM_CTRL
,
1897 PCI_PM_CTRL_STATE_MASK
);
1900 if (proxy
->flags
& VIRTIO_PCI_FLAG_ATS
) {
1901 pcie_ats_init(pci_dev
, last_pcie_cap_offset
,
1902 proxy
->flags
& VIRTIO_PCI_FLAG_ATS_PAGE_ALIGNED
);
1903 last_pcie_cap_offset
+= PCI_EXT_CAP_ATS_SIZEOF
;
1906 if (proxy
->flags
& VIRTIO_PCI_FLAG_INIT_FLR
) {
1907 /* Set Function Level Reset capability bit */
1908 pcie_cap_flr_init(pci_dev
);
1912 * make future invocations of pci_is_express() return false
1913 * and pci_config_size() return PCI_CONFIG_SPACE_SIZE.
1915 pci_dev
->cap_present
&= ~QEMU_PCI_CAP_EXPRESS
;
1918 virtio_pci_bus_new(&proxy
->bus
, sizeof(proxy
->bus
), proxy
);
1920 k
->realize(proxy
, errp
);
1924 static void virtio_pci_exit(PCIDevice
*pci_dev
)
1926 VirtIOPCIProxy
*proxy
= VIRTIO_PCI(pci_dev
);
1927 bool pcie_port
= pci_bus_is_express(pci_get_bus(pci_dev
)) &&
1928 !pci_bus_is_root(pci_get_bus(pci_dev
));
1930 msix_uninit_exclusive_bar(pci_dev
);
1931 if (proxy
->flags
& VIRTIO_PCI_FLAG_AER
&& pcie_port
&&
1932 pci_is_express(pci_dev
)) {
1933 pcie_aer_exit(pci_dev
);
1937 static void virtio_pci_reset(DeviceState
*qdev
)
1939 VirtIOPCIProxy
*proxy
= VIRTIO_PCI(qdev
);
1940 VirtioBusState
*bus
= VIRTIO_BUS(&proxy
->bus
);
1941 PCIDevice
*dev
= PCI_DEVICE(qdev
);
1944 virtio_pci_stop_ioeventfd(proxy
);
1945 virtio_bus_reset(bus
);
1946 msix_unuse_all_vectors(&proxy
->pci_dev
);
1948 for (i
= 0; i
< VIRTIO_QUEUE_MAX
; i
++) {
1949 proxy
->vqs
[i
].enabled
= 0;
1950 proxy
->vqs
[i
].num
= 0;
1951 proxy
->vqs
[i
].desc
[0] = proxy
->vqs
[i
].desc
[1] = 0;
1952 proxy
->vqs
[i
].avail
[0] = proxy
->vqs
[i
].avail
[1] = 0;
1953 proxy
->vqs
[i
].used
[0] = proxy
->vqs
[i
].used
[1] = 0;
1956 if (pci_is_express(dev
)) {
1957 pcie_cap_deverr_reset(dev
);
1958 pcie_cap_lnkctl_reset(dev
);
1960 pci_set_word(dev
->config
+ dev
->exp
.pm_cap
+ PCI_PM_CTRL
, 0);
1964 static Property virtio_pci_properties
[] = {
1965 DEFINE_PROP_BIT("virtio-pci-bus-master-bug-migration", VirtIOPCIProxy
, flags
,
1966 VIRTIO_PCI_FLAG_BUS_MASTER_BUG_MIGRATION_BIT
, false),
1967 DEFINE_PROP_BIT("migrate-extra", VirtIOPCIProxy
, flags
,
1968 VIRTIO_PCI_FLAG_MIGRATE_EXTRA_BIT
, true),
1969 DEFINE_PROP_BIT("modern-pio-notify", VirtIOPCIProxy
, flags
,
1970 VIRTIO_PCI_FLAG_MODERN_PIO_NOTIFY_BIT
, false),
1971 DEFINE_PROP_BIT("x-disable-pcie", VirtIOPCIProxy
, flags
,
1972 VIRTIO_PCI_FLAG_DISABLE_PCIE_BIT
, false),
1973 DEFINE_PROP_BIT("page-per-vq", VirtIOPCIProxy
, flags
,
1974 VIRTIO_PCI_FLAG_PAGE_PER_VQ_BIT
, false),
1975 DEFINE_PROP_BOOL("x-ignore-backend-features", VirtIOPCIProxy
,
1976 ignore_backend_features
, false),
1977 DEFINE_PROP_BIT("ats", VirtIOPCIProxy
, flags
,
1978 VIRTIO_PCI_FLAG_ATS_BIT
, false),
1979 DEFINE_PROP_BIT("x-ats-page-aligned", VirtIOPCIProxy
, flags
,
1980 VIRTIO_PCI_FLAG_ATS_PAGE_ALIGNED_BIT
, true),
1981 DEFINE_PROP_BIT("x-pcie-deverr-init", VirtIOPCIProxy
, flags
,
1982 VIRTIO_PCI_FLAG_INIT_DEVERR_BIT
, true),
1983 DEFINE_PROP_BIT("x-pcie-lnkctl-init", VirtIOPCIProxy
, flags
,
1984 VIRTIO_PCI_FLAG_INIT_LNKCTL_BIT
, true),
1985 DEFINE_PROP_BIT("x-pcie-pm-init", VirtIOPCIProxy
, flags
,
1986 VIRTIO_PCI_FLAG_INIT_PM_BIT
, true),
1987 DEFINE_PROP_BIT("x-pcie-flr-init", VirtIOPCIProxy
, flags
,
1988 VIRTIO_PCI_FLAG_INIT_FLR_BIT
, true),
1989 DEFINE_PROP_BIT("aer", VirtIOPCIProxy
, flags
,
1990 VIRTIO_PCI_FLAG_AER_BIT
, false),
1991 DEFINE_PROP_END_OF_LIST(),
1994 static void virtio_pci_dc_realize(DeviceState
*qdev
, Error
**errp
)
1996 VirtioPCIClass
*vpciklass
= VIRTIO_PCI_GET_CLASS(qdev
);
1997 VirtIOPCIProxy
*proxy
= VIRTIO_PCI(qdev
);
1998 PCIDevice
*pci_dev
= &proxy
->pci_dev
;
2000 if (!(proxy
->flags
& VIRTIO_PCI_FLAG_DISABLE_PCIE
) &&
2001 virtio_pci_modern(proxy
)) {
2002 pci_dev
->cap_present
|= QEMU_PCI_CAP_EXPRESS
;
2005 vpciklass
->parent_dc_realize(qdev
, errp
);
2008 static void virtio_pci_class_init(ObjectClass
*klass
, void *data
)
2010 DeviceClass
*dc
= DEVICE_CLASS(klass
);
2011 PCIDeviceClass
*k
= PCI_DEVICE_CLASS(klass
);
2012 VirtioPCIClass
*vpciklass
= VIRTIO_PCI_CLASS(klass
);
2014 device_class_set_props(dc
, virtio_pci_properties
);
2015 k
->realize
= virtio_pci_realize
;
2016 k
->exit
= virtio_pci_exit
;
2017 k
->vendor_id
= PCI_VENDOR_ID_REDHAT_QUMRANET
;
2018 k
->revision
= VIRTIO_PCI_ABI_VERSION
;
2019 k
->class_id
= PCI_CLASS_OTHERS
;
2020 device_class_set_parent_realize(dc
, virtio_pci_dc_realize
,
2021 &vpciklass
->parent_dc_realize
);
2022 dc
->reset
= virtio_pci_reset
;
2025 static const TypeInfo virtio_pci_info
= {
2026 .name
= TYPE_VIRTIO_PCI
,
2027 .parent
= TYPE_PCI_DEVICE
,
2028 .instance_size
= sizeof(VirtIOPCIProxy
),
2029 .class_init
= virtio_pci_class_init
,
2030 .class_size
= sizeof(VirtioPCIClass
),
2034 static Property virtio_pci_generic_properties
[] = {
2035 DEFINE_PROP_ON_OFF_AUTO("disable-legacy", VirtIOPCIProxy
, disable_legacy
,
2037 DEFINE_PROP_BOOL("disable-modern", VirtIOPCIProxy
, disable_modern
, false),
2038 DEFINE_PROP_END_OF_LIST(),
2041 static void virtio_pci_base_class_init(ObjectClass
*klass
, void *data
)
2043 const VirtioPCIDeviceTypeInfo
*t
= data
;
2044 if (t
->class_init
) {
2045 t
->class_init(klass
, NULL
);
2049 static void virtio_pci_generic_class_init(ObjectClass
*klass
, void *data
)
2051 DeviceClass
*dc
= DEVICE_CLASS(klass
);
2053 device_class_set_props(dc
, virtio_pci_generic_properties
);
2056 static void virtio_pci_transitional_instance_init(Object
*obj
)
2058 VirtIOPCIProxy
*proxy
= VIRTIO_PCI(obj
);
2060 proxy
->disable_legacy
= ON_OFF_AUTO_OFF
;
2061 proxy
->disable_modern
= false;
2064 static void virtio_pci_non_transitional_instance_init(Object
*obj
)
2066 VirtIOPCIProxy
*proxy
= VIRTIO_PCI(obj
);
2068 proxy
->disable_legacy
= ON_OFF_AUTO_ON
;
2069 proxy
->disable_modern
= false;
2072 void virtio_pci_types_register(const VirtioPCIDeviceTypeInfo
*t
)
2074 char *base_name
= NULL
;
2075 TypeInfo base_type_info
= {
2076 .name
= t
->base_name
,
2077 .parent
= t
->parent
? t
->parent
: TYPE_VIRTIO_PCI
,
2078 .instance_size
= t
->instance_size
,
2079 .instance_init
= t
->instance_init
,
2080 .class_size
= t
->class_size
,
2082 .interfaces
= t
->interfaces
,
2084 TypeInfo generic_type_info
= {
2085 .name
= t
->generic_name
,
2086 .parent
= base_type_info
.name
,
2087 .class_init
= virtio_pci_generic_class_init
,
2088 .interfaces
= (InterfaceInfo
[]) {
2089 { INTERFACE_PCIE_DEVICE
},
2090 { INTERFACE_CONVENTIONAL_PCI_DEVICE
},
2095 if (!base_type_info
.name
) {
2096 /* No base type -> register a single generic device type */
2097 /* use intermediate %s-base-type to add generic device props */
2098 base_name
= g_strdup_printf("%s-base-type", t
->generic_name
);
2099 base_type_info
.name
= base_name
;
2100 base_type_info
.class_init
= virtio_pci_generic_class_init
;
2102 generic_type_info
.parent
= base_name
;
2103 generic_type_info
.class_init
= virtio_pci_base_class_init
;
2104 generic_type_info
.class_data
= (void *)t
;
2106 assert(!t
->non_transitional_name
);
2107 assert(!t
->transitional_name
);
2109 base_type_info
.class_init
= virtio_pci_base_class_init
;
2110 base_type_info
.class_data
= (void *)t
;
2113 type_register(&base_type_info
);
2114 if (generic_type_info
.name
) {
2115 type_register(&generic_type_info
);
2118 if (t
->non_transitional_name
) {
2119 const TypeInfo non_transitional_type_info
= {
2120 .name
= t
->non_transitional_name
,
2121 .parent
= base_type_info
.name
,
2122 .instance_init
= virtio_pci_non_transitional_instance_init
,
2123 .interfaces
= (InterfaceInfo
[]) {
2124 { INTERFACE_PCIE_DEVICE
},
2125 { INTERFACE_CONVENTIONAL_PCI_DEVICE
},
2129 type_register(&non_transitional_type_info
);
2132 if (t
->transitional_name
) {
2133 const TypeInfo transitional_type_info
= {
2134 .name
= t
->transitional_name
,
2135 .parent
= base_type_info
.name
,
2136 .instance_init
= virtio_pci_transitional_instance_init
,
2137 .interfaces
= (InterfaceInfo
[]) {
2139 * Transitional virtio devices work only as Conventional PCI
2140 * devices because they require PIO ports.
2142 { INTERFACE_CONVENTIONAL_PCI_DEVICE
},
2146 type_register(&transitional_type_info
);
2151 unsigned virtio_pci_optimal_num_queues(unsigned fixed_queues
)
2154 * 1:1 vq to vCPU mapping is ideal because the same vCPU that submitted
2155 * virtqueue buffers can handle their completion. When a different vCPU
2156 * handles completion it may need to IPI the vCPU that submitted the
2157 * request and this adds overhead.
2159 * Virtqueues consume guest RAM and MSI-X vectors. This is wasteful in
2160 * guests with very many vCPUs and a device that is only used by a few
2161 * vCPUs. Unfortunately optimizing that case requires manual pinning inside
2162 * the guest, so those users might as well manually set the number of
2163 * queues. There is no upper limit that can be applied automatically and
2164 * doing so arbitrarily would result in a sudden performance drop once the
2165 * threshold number of vCPUs is exceeded.
2167 unsigned num_queues
= current_machine
->smp
.cpus
;
2170 * The maximum number of MSI-X vectors is PCI_MSIX_FLAGS_QSIZE + 1, but the
2171 * config change interrupt and the fixed virtqueues must be taken into
2174 num_queues
= MIN(num_queues
, PCI_MSIX_FLAGS_QSIZE
- fixed_queues
);
2177 * There is a limit to how many virtqueues a device can have.
2179 return MIN(num_queues
, VIRTIO_QUEUE_MAX
- fixed_queues
);
2182 /* virtio-pci-bus */
2184 static void virtio_pci_bus_new(VirtioBusState
*bus
, size_t bus_size
,
2185 VirtIOPCIProxy
*dev
)
2187 DeviceState
*qdev
= DEVICE(dev
);
2188 char virtio_bus_name
[] = "virtio-bus";
2190 qbus_create_inplace(bus
, bus_size
, TYPE_VIRTIO_PCI_BUS
, qdev
,
2194 static void virtio_pci_bus_class_init(ObjectClass
*klass
, void *data
)
2196 BusClass
*bus_class
= BUS_CLASS(klass
);
2197 VirtioBusClass
*k
= VIRTIO_BUS_CLASS(klass
);
2198 bus_class
->max_dev
= 1;
2199 k
->notify
= virtio_pci_notify
;
2200 k
->save_config
= virtio_pci_save_config
;
2201 k
->load_config
= virtio_pci_load_config
;
2202 k
->save_queue
= virtio_pci_save_queue
;
2203 k
->load_queue
= virtio_pci_load_queue
;
2204 k
->save_extra_state
= virtio_pci_save_extra_state
;
2205 k
->load_extra_state
= virtio_pci_load_extra_state
;
2206 k
->has_extra_state
= virtio_pci_has_extra_state
;
2207 k
->query_guest_notifiers
= virtio_pci_query_guest_notifiers
;
2208 k
->set_guest_notifiers
= virtio_pci_set_guest_notifiers
;
2209 k
->set_host_notifier_mr
= virtio_pci_set_host_notifier_mr
;
2210 k
->vmstate_change
= virtio_pci_vmstate_change
;
2211 k
->pre_plugged
= virtio_pci_pre_plugged
;
2212 k
->device_plugged
= virtio_pci_device_plugged
;
2213 k
->device_unplugged
= virtio_pci_device_unplugged
;
2214 k
->query_nvectors
= virtio_pci_query_nvectors
;
2215 k
->ioeventfd_enabled
= virtio_pci_ioeventfd_enabled
;
2216 k
->ioeventfd_assign
= virtio_pci_ioeventfd_assign
;
2217 k
->get_dma_as
= virtio_pci_get_dma_as
;
2218 k
->iommu_enabled
= virtio_pci_iommu_enabled
;
2219 k
->queue_enabled
= virtio_pci_queue_enabled
;
2222 static const TypeInfo virtio_pci_bus_info
= {
2223 .name
= TYPE_VIRTIO_PCI_BUS
,
2224 .parent
= TYPE_VIRTIO_BUS
,
2225 .instance_size
= sizeof(VirtioPCIBusState
),
2226 .class_size
= sizeof(VirtioPCIBusClass
),
2227 .class_init
= virtio_pci_bus_class_init
,
2230 static void virtio_pci_register_types(void)
2233 type_register_static(&virtio_pci_bus_info
);
2234 type_register_static(&virtio_pci_info
);
2237 type_init(virtio_pci_register_types
)