virtio-pci.c - qemu - FORK: QEMU emulator

virtio-pci.c (74792B)
      1 /*
      2  * Virtio PCI Bindings
      3  *
      4  * Copyright IBM, Corp. 2007
      5  * Copyright (c) 2009 CodeSourcery
      6  *
      7  * Authors:
      8  *  Anthony Liguori   <aliguori@us.ibm.com>
      9  *  Paul Brook        <paul@codesourcery.com>
     10  *
     11  * This work is licensed under the terms of the GNU GPL, version 2.  See
     12  * the COPYING file in the top-level directory.
     13  *
     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.
     16  */
     17 
     18 #include "qemu/osdep.h"
     19 
     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"
     30 #include "qemu/log.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 "hw/virtio/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"
     41 #include "trace.h"
     42 
     43 #define VIRTIO_PCI_REGION_SIZE(dev)     VIRTIO_PCI_CONFIG_OFF(msix_present(dev))
     44 
     45 #undef VIRTIO_PCI_CONFIG
     46 
     47 /* The remaining space is defined by each driver as the per-driver
     48  * configuration space */
     49 #define VIRTIO_PCI_CONFIG_SIZE(dev)     VIRTIO_PCI_CONFIG_OFF(msix_enabled(dev))
     50 
     51 static void virtio_pci_bus_new(VirtioBusState *bus, size_t bus_size,
     52                                VirtIOPCIProxy *dev);
     53 static void virtio_pci_reset(DeviceState *qdev);
     54 
     55 /* virtio device */
     56 /* DeviceState to VirtIOPCIProxy. For use off data-path. TODO: use QOM. */
     57 static inline VirtIOPCIProxy *to_virtio_pci_proxy(DeviceState *d)
     58 {
     59     return container_of(d, VirtIOPCIProxy, pci_dev.qdev);
     60 }
     61 
     62 /* DeviceState to VirtIOPCIProxy. Note: used on datapath,
     63  * be careful and test performance if you change this.
     64  */
     65 static inline VirtIOPCIProxy *to_virtio_pci_proxy_fast(DeviceState *d)
     66 {
     67     return container_of(d, VirtIOPCIProxy, pci_dev.qdev);
     68 }
     69 
     70 static void virtio_pci_notify(DeviceState *d, uint16_t vector)
     71 {
     72     VirtIOPCIProxy *proxy = to_virtio_pci_proxy_fast(d);
     73 
     74     if (msix_enabled(&proxy->pci_dev)) {
     75         if (vector != VIRTIO_NO_VECTOR) {
     76             msix_notify(&proxy->pci_dev, vector);
     77         }
     78     } else {
     79         VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
     80         pci_set_irq(&proxy->pci_dev, qatomic_read(&vdev->isr) & 1);
     81     }
     82 }
     83 
     84 static void virtio_pci_save_config(DeviceState *d, QEMUFile *f)
     85 {
     86     VirtIOPCIProxy *proxy = to_virtio_pci_proxy(d);
     87     VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
     88 
     89     pci_device_save(&proxy->pci_dev, f);
     90     msix_save(&proxy->pci_dev, f);
     91     if (msix_present(&proxy->pci_dev))
     92         qemu_put_be16(f, vdev->config_vector);
     93 }
     94 
     95 static const VMStateDescription vmstate_virtio_pci_modern_queue_state = {
     96     .name = "virtio_pci/modern_queue_state",
     97     .version_id = 1,
     98     .minimum_version_id = 1,
     99     .fields = (VMStateField[]) {
    100         VMSTATE_UINT16(num, VirtIOPCIQueue),
    101         VMSTATE_UNUSED(1), /* enabled was stored as be16 */
    102         VMSTATE_BOOL(enabled, VirtIOPCIQueue),
    103         VMSTATE_UINT32_ARRAY(desc, VirtIOPCIQueue, 2),
    104         VMSTATE_UINT32_ARRAY(avail, VirtIOPCIQueue, 2),
    105         VMSTATE_UINT32_ARRAY(used, VirtIOPCIQueue, 2),
    106         VMSTATE_END_OF_LIST()
    107     }
    108 };
    109 
    110 static bool virtio_pci_modern_state_needed(void *opaque)
    111 {
    112     VirtIOPCIProxy *proxy = opaque;
    113 
    114     return virtio_pci_modern(proxy);
    115 }
    116 
    117 static const VMStateDescription vmstate_virtio_pci_modern_state_sub = {
    118     .name = "virtio_pci/modern_state",
    119     .version_id = 1,
    120     .minimum_version_id = 1,
    121     .needed = &virtio_pci_modern_state_needed,
    122     .fields = (VMStateField[]) {
    123         VMSTATE_UINT32(dfselect, VirtIOPCIProxy),
    124         VMSTATE_UINT32(gfselect, VirtIOPCIProxy),
    125         VMSTATE_UINT32_ARRAY(guest_features, VirtIOPCIProxy, 2),
    126         VMSTATE_STRUCT_ARRAY(vqs, VirtIOPCIProxy, VIRTIO_QUEUE_MAX, 0,
    127                              vmstate_virtio_pci_modern_queue_state,
    128                              VirtIOPCIQueue),
    129         VMSTATE_END_OF_LIST()
    130     }
    131 };
    132 
    133 static const VMStateDescription vmstate_virtio_pci = {
    134     .name = "virtio_pci",
    135     .version_id = 1,
    136     .minimum_version_id = 1,
    137     .fields = (VMStateField[]) {
    138         VMSTATE_END_OF_LIST()
    139     },
    140     .subsections = (const VMStateDescription*[]) {
    141         &vmstate_virtio_pci_modern_state_sub,
    142         NULL
    143     }
    144 };
    145 
    146 static bool virtio_pci_has_extra_state(DeviceState *d)
    147 {
    148     VirtIOPCIProxy *proxy = to_virtio_pci_proxy(d);
    149 
    150     return proxy->flags & VIRTIO_PCI_FLAG_MIGRATE_EXTRA;
    151 }
    152 
    153 static void virtio_pci_save_extra_state(DeviceState *d, QEMUFile *f)
    154 {
    155     VirtIOPCIProxy *proxy = to_virtio_pci_proxy(d);
    156 
    157     vmstate_save_state(f, &vmstate_virtio_pci, proxy, NULL);
    158 }
    159 
    160 static int virtio_pci_load_extra_state(DeviceState *d, QEMUFile *f)
    161 {
    162     VirtIOPCIProxy *proxy = to_virtio_pci_proxy(d);
    163 
    164     return vmstate_load_state(f, &vmstate_virtio_pci, proxy, 1);
    165 }
    166 
    167 static void virtio_pci_save_queue(DeviceState *d, int n, QEMUFile *f)
    168 {
    169     VirtIOPCIProxy *proxy = to_virtio_pci_proxy(d);
    170     VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
    171 
    172     if (msix_present(&proxy->pci_dev))
    173         qemu_put_be16(f, virtio_queue_vector(vdev, n));
    174 }
    175 
    176 static int virtio_pci_load_config(DeviceState *d, QEMUFile *f)
    177 {
    178     VirtIOPCIProxy *proxy = to_virtio_pci_proxy(d);
    179     VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
    180     uint16_t vector;
    181 
    182     int ret;
    183     ret = pci_device_load(&proxy->pci_dev, f);
    184     if (ret) {
    185         return ret;
    186     }
    187     msix_unuse_all_vectors(&proxy->pci_dev);
    188     msix_load(&proxy->pci_dev, f);
    189     if (msix_present(&proxy->pci_dev)) {
    190         qemu_get_be16s(f, &vector);
    191 
    192         if (vector != VIRTIO_NO_VECTOR && vector >= proxy->nvectors) {
    193             return -EINVAL;
    194         }
    195     } else {
    196         vector = VIRTIO_NO_VECTOR;
    197     }
    198     vdev->config_vector = vector;
    199     if (vector != VIRTIO_NO_VECTOR) {
    200         msix_vector_use(&proxy->pci_dev, vector);
    201     }
    202     return 0;
    203 }
    204 
    205 static int virtio_pci_load_queue(DeviceState *d, int n, QEMUFile *f)
    206 {
    207     VirtIOPCIProxy *proxy = to_virtio_pci_proxy(d);
    208     VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
    209 
    210     uint16_t vector;
    211     if (msix_present(&proxy->pci_dev)) {
    212         qemu_get_be16s(f, &vector);
    213         if (vector != VIRTIO_NO_VECTOR && vector >= proxy->nvectors) {
    214             return -EINVAL;
    215         }
    216     } else {
    217         vector = VIRTIO_NO_VECTOR;
    218     }
    219     virtio_queue_set_vector(vdev, n, vector);
    220     if (vector != VIRTIO_NO_VECTOR) {
    221         msix_vector_use(&proxy->pci_dev, vector);
    222     }
    223 
    224     return 0;
    225 }
    226 
    227 static bool virtio_pci_ioeventfd_enabled(DeviceState *d)
    228 {
    229     VirtIOPCIProxy *proxy = to_virtio_pci_proxy(d);
    230 
    231     return (proxy->flags & VIRTIO_PCI_FLAG_USE_IOEVENTFD) != 0;
    232 }
    233 
    234 #define QEMU_VIRTIO_PCI_QUEUE_MEM_MULT 0x1000
    235 
    236 static inline int virtio_pci_queue_mem_mult(struct VirtIOPCIProxy *proxy)
    237 {
    238     return (proxy->flags & VIRTIO_PCI_FLAG_PAGE_PER_VQ) ?
    239         QEMU_VIRTIO_PCI_QUEUE_MEM_MULT : 4;
    240 }
    241 
    242 static int virtio_pci_ioeventfd_assign(DeviceState *d, EventNotifier *notifier,
    243                                        int n, bool assign)
    244 {
    245     VirtIOPCIProxy *proxy = to_virtio_pci_proxy(d);
    246     VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
    247     VirtQueue *vq = virtio_get_queue(vdev, n);
    248     bool legacy = virtio_pci_legacy(proxy);
    249     bool modern = virtio_pci_modern(proxy);
    250     bool fast_mmio = kvm_ioeventfd_any_length_enabled();
    251     bool modern_pio = proxy->flags & VIRTIO_PCI_FLAG_MODERN_PIO_NOTIFY;
    252     MemoryRegion *modern_mr = &proxy->notify.mr;
    253     MemoryRegion *modern_notify_mr = &proxy->notify_pio.mr;
    254     MemoryRegion *legacy_mr = &proxy->bar;
    255     hwaddr modern_addr = virtio_pci_queue_mem_mult(proxy) *
    256                          virtio_get_queue_index(vq);
    257     hwaddr legacy_addr = VIRTIO_PCI_QUEUE_NOTIFY;
    258 
    259     if (assign) {
    260         if (modern) {
    261             if (fast_mmio) {
    262                 memory_region_add_eventfd(modern_mr, modern_addr, 0,
    263                                           false, n, notifier);
    264             } else {
    265                 memory_region_add_eventfd(modern_mr, modern_addr, 2,
    266                                           false, n, notifier);
    267             }
    268             if (modern_pio) {
    269                 memory_region_add_eventfd(modern_notify_mr, 0, 2,
    270                                               true, n, notifier);
    271             }
    272         }
    273         if (legacy) {
    274             memory_region_add_eventfd(legacy_mr, legacy_addr, 2,
    275                                       true, n, notifier);
    276         }
    277     } else {
    278         if (modern) {
    279             if (fast_mmio) {
    280                 memory_region_del_eventfd(modern_mr, modern_addr, 0,
    281                                           false, n, notifier);
    282             } else {
    283                 memory_region_del_eventfd(modern_mr, modern_addr, 2,
    284                                           false, n, notifier);
    285             }
    286             if (modern_pio) {
    287                 memory_region_del_eventfd(modern_notify_mr, 0, 2,
    288                                           true, n, notifier);
    289             }
    290         }
    291         if (legacy) {
    292             memory_region_del_eventfd(legacy_mr, legacy_addr, 2,
    293                                       true, n, notifier);
    294         }
    295     }
    296     return 0;
    297 }
    298 
    299 static void virtio_pci_start_ioeventfd(VirtIOPCIProxy *proxy)
    300 {
    301     virtio_bus_start_ioeventfd(&proxy->bus);
    302 }
    303 
    304 static void virtio_pci_stop_ioeventfd(VirtIOPCIProxy *proxy)
    305 {
    306     virtio_bus_stop_ioeventfd(&proxy->bus);
    307 }
    308 
    309 static void virtio_ioport_write(void *opaque, uint32_t addr, uint32_t val)
    310 {
    311     VirtIOPCIProxy *proxy = opaque;
    312     VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
    313     uint16_t vector;
    314     hwaddr pa;
    315 
    316     switch (addr) {
    317     case VIRTIO_PCI_GUEST_FEATURES:
    318         /* Guest does not negotiate properly?  We have to assume nothing. */
    319         if (val & (1 << VIRTIO_F_BAD_FEATURE)) {
    320             val = virtio_bus_get_vdev_bad_features(&proxy->bus);
    321         }
    322         virtio_set_features(vdev, val);
    323         break;
    324     case VIRTIO_PCI_QUEUE_PFN:
    325         pa = (hwaddr)val << VIRTIO_PCI_QUEUE_ADDR_SHIFT;
    326         if (pa == 0) {
    327             virtio_pci_reset(DEVICE(proxy));
    328         }
    329         else
    330             virtio_queue_set_addr(vdev, vdev->queue_sel, pa);
    331         break;
    332     case VIRTIO_PCI_QUEUE_SEL:
    333         if (val < VIRTIO_QUEUE_MAX)
    334             vdev->queue_sel = val;
    335         break;
    336     case VIRTIO_PCI_QUEUE_NOTIFY:
    337         if (val < VIRTIO_QUEUE_MAX) {
    338             virtio_queue_notify(vdev, val);
    339         }
    340         break;
    341     case VIRTIO_PCI_STATUS:
    342         if (!(val & VIRTIO_CONFIG_S_DRIVER_OK)) {
    343             virtio_pci_stop_ioeventfd(proxy);
    344         }
    345 
    346         virtio_set_status(vdev, val & 0xFF);
    347 
    348         if (val & VIRTIO_CONFIG_S_DRIVER_OK) {
    349             virtio_pci_start_ioeventfd(proxy);
    350         }
    351 
    352         if (vdev->status == 0) {
    353             virtio_pci_reset(DEVICE(proxy));
    354         }
    355 
    356         /* Linux before 2.6.34 drives the device without enabling
    357            the PCI device bus master bit. Enable it automatically
    358            for the guest. This is a PCI spec violation but so is
    359            initiating DMA with bus master bit clear. */
    360         if (val == (VIRTIO_CONFIG_S_ACKNOWLEDGE | VIRTIO_CONFIG_S_DRIVER)) {
    361             pci_default_write_config(&proxy->pci_dev, PCI_COMMAND,
    362                                      proxy->pci_dev.config[PCI_COMMAND] |
    363                                      PCI_COMMAND_MASTER, 1);
    364         }
    365         break;
    366     case VIRTIO_MSI_CONFIG_VECTOR:
    367         if (vdev->config_vector != VIRTIO_NO_VECTOR) {
    368             msix_vector_unuse(&proxy->pci_dev, vdev->config_vector);
    369         }
    370         /* Make it possible for guest to discover an error took place. */
    371         if (val < proxy->nvectors) {
    372             msix_vector_use(&proxy->pci_dev, val);
    373         } else {
    374             val = VIRTIO_NO_VECTOR;
    375         }
    376         vdev->config_vector = val;
    377         break;
    378     case VIRTIO_MSI_QUEUE_VECTOR:
    379         vector = virtio_queue_vector(vdev, vdev->queue_sel);
    380         if (vector != VIRTIO_NO_VECTOR) {
    381             msix_vector_unuse(&proxy->pci_dev, vector);
    382         }
    383         /* Make it possible for guest to discover an error took place. */
    384         if (val < proxy->nvectors) {
    385             msix_vector_use(&proxy->pci_dev, val);
    386         } else {
    387             val = VIRTIO_NO_VECTOR;
    388         }
    389         virtio_queue_set_vector(vdev, vdev->queue_sel, val);
    390         break;
    391     default:
    392         qemu_log_mask(LOG_GUEST_ERROR,
    393                       "%s: unexpected address 0x%x value 0x%x\n",
    394                       __func__, addr, val);
    395         break;
    396     }
    397 }
    398 
    399 static uint32_t virtio_ioport_read(VirtIOPCIProxy *proxy, uint32_t addr)
    400 {
    401     VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
    402     uint32_t ret = 0xFFFFFFFF;
    403 
    404     switch (addr) {
    405     case VIRTIO_PCI_HOST_FEATURES:
    406         ret = vdev->host_features;
    407         break;
    408     case VIRTIO_PCI_GUEST_FEATURES:
    409         ret = vdev->guest_features;
    410         break;
    411     case VIRTIO_PCI_QUEUE_PFN:
    412         ret = virtio_queue_get_addr(vdev, vdev->queue_sel)
    413               >> VIRTIO_PCI_QUEUE_ADDR_SHIFT;
    414         break;
    415     case VIRTIO_PCI_QUEUE_NUM:
    416         ret = virtio_queue_get_num(vdev, vdev->queue_sel);
    417         break;
    418     case VIRTIO_PCI_QUEUE_SEL:
    419         ret = vdev->queue_sel;
    420         break;
    421     case VIRTIO_PCI_STATUS:
    422         ret = vdev->status;
    423         break;
    424     case VIRTIO_PCI_ISR:
    425         /* reading from the ISR also clears it. */
    426         ret = qatomic_xchg(&vdev->isr, 0);
    427         pci_irq_deassert(&proxy->pci_dev);
    428         break;
    429     case VIRTIO_MSI_CONFIG_VECTOR:
    430         ret = vdev->config_vector;
    431         break;
    432     case VIRTIO_MSI_QUEUE_VECTOR:
    433         ret = virtio_queue_vector(vdev, vdev->queue_sel);
    434         break;
    435     default:
    436         break;
    437     }
    438 
    439     return ret;
    440 }
    441 
    442 static uint64_t virtio_pci_config_read(void *opaque, hwaddr addr,
    443                                        unsigned size)
    444 {
    445     VirtIOPCIProxy *proxy = opaque;
    446     VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
    447     uint32_t config = VIRTIO_PCI_CONFIG_SIZE(&proxy->pci_dev);
    448     uint64_t val = 0;
    449 
    450     if (vdev == NULL) {
    451         return UINT64_MAX;
    452     }
    453 
    454     if (addr < config) {
    455         return virtio_ioport_read(proxy, addr);
    456     }
    457     addr -= config;
    458 
    459     switch (size) {
    460     case 1:
    461         val = virtio_config_readb(vdev, addr);
    462         break;
    463     case 2:
    464         val = virtio_config_readw(vdev, addr);
    465         if (virtio_is_big_endian(vdev)) {
    466             val = bswap16(val);
    467         }
    468         break;
    469     case 4:
    470         val = virtio_config_readl(vdev, addr);
    471         if (virtio_is_big_endian(vdev)) {
    472             val = bswap32(val);
    473         }
    474         break;
    475     }
    476     return val;
    477 }
    478 
    479 static void virtio_pci_config_write(void *opaque, hwaddr addr,
    480                                     uint64_t val, unsigned size)
    481 {
    482     VirtIOPCIProxy *proxy = opaque;
    483     uint32_t config = VIRTIO_PCI_CONFIG_SIZE(&proxy->pci_dev);
    484     VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
    485 
    486     if (vdev == NULL) {
    487         return;
    488     }
    489 
    490     if (addr < config) {
    491         virtio_ioport_write(proxy, addr, val);
    492         return;
    493     }
    494     addr -= config;
    495     /*
    496      * Virtio-PCI is odd. Ioports are LE but config space is target native
    497      * endian.
    498      */
    499     switch (size) {
    500     case 1:
    501         virtio_config_writeb(vdev, addr, val);
    502         break;
    503     case 2:
    504         if (virtio_is_big_endian(vdev)) {
    505             val = bswap16(val);
    506         }
    507         virtio_config_writew(vdev, addr, val);
    508         break;
    509     case 4:
    510         if (virtio_is_big_endian(vdev)) {
    511             val = bswap32(val);
    512         }
    513         virtio_config_writel(vdev, addr, val);
    514         break;
    515     }
    516 }
    517 
    518 static const MemoryRegionOps virtio_pci_config_ops = {
    519     .read = virtio_pci_config_read,
    520     .write = virtio_pci_config_write,
    521     .impl = {
    522         .min_access_size = 1,
    523         .max_access_size = 4,
    524     },
    525     .endianness = DEVICE_LITTLE_ENDIAN,
    526 };
    527 
    528 static MemoryRegion *virtio_address_space_lookup(VirtIOPCIProxy *proxy,
    529                                                  hwaddr *off, int len)
    530 {
    531     int i;
    532     VirtIOPCIRegion *reg;
    533 
    534     for (i = 0; i < ARRAY_SIZE(proxy->regs); ++i) {
    535         reg = &proxy->regs[i];
    536         if (*off >= reg->offset &&
    537             *off + len <= reg->offset + reg->size) {
    538             *off -= reg->offset;
    539             return &reg->mr;
    540         }
    541     }
    542 
    543     return NULL;
    544 }
    545 
    546 /* Below are generic functions to do memcpy from/to an address space,
    547  * without byteswaps, with input validation.
    548  *
    549  * As regular address_space_* APIs all do some kind of byteswap at least for
    550  * some host/target combinations, we are forced to explicitly convert to a
    551  * known-endianness integer value.
    552  * It doesn't really matter which endian format to go through, so the code
    553  * below selects the endian that causes the least amount of work on the given
    554  * host.
    555  *
    556  * Note: host pointer must be aligned.
    557  */
    558 static
    559 void virtio_address_space_write(VirtIOPCIProxy *proxy, hwaddr addr,
    560                                 const uint8_t *buf, int len)
    561 {
    562     uint64_t val;
    563     MemoryRegion *mr;
    564 
    565     /* address_space_* APIs assume an aligned address.
    566      * As address is under guest control, handle illegal values.
    567      */
    568     addr &= ~(len - 1);
    569 
    570     mr = virtio_address_space_lookup(proxy, &addr, len);
    571     if (!mr) {
    572         return;
    573     }
    574 
    575     /* Make sure caller aligned buf properly */
    576     assert(!(((uintptr_t)buf) & (len - 1)));
    577 
    578     switch (len) {
    579     case 1:
    580         val = pci_get_byte(buf);
    581         break;
    582     case 2:
    583         val = pci_get_word(buf);
    584         break;
    585     case 4:
    586         val = pci_get_long(buf);
    587         break;
    588     default:
    589         /* As length is under guest control, handle illegal values. */
    590         return;
    591     }
    592     memory_region_dispatch_write(mr, addr, val, size_memop(len) | MO_LE,
    593                                  MEMTXATTRS_UNSPECIFIED);
    594 }
    595 
    596 static void
    597 virtio_address_space_read(VirtIOPCIProxy *proxy, hwaddr addr,
    598                           uint8_t *buf, int len)
    599 {
    600     uint64_t val;
    601     MemoryRegion *mr;
    602 
    603     /* address_space_* APIs assume an aligned address.
    604      * As address is under guest control, handle illegal values.
    605      */
    606     addr &= ~(len - 1);
    607 
    608     mr = virtio_address_space_lookup(proxy, &addr, len);
    609     if (!mr) {
    610         return;
    611     }
    612 
    613     /* Make sure caller aligned buf properly */
    614     assert(!(((uintptr_t)buf) & (len - 1)));
    615 
    616     memory_region_dispatch_read(mr, addr, &val, size_memop(len) | MO_LE,
    617                                 MEMTXATTRS_UNSPECIFIED);
    618     switch (len) {
    619     case 1:
    620         pci_set_byte(buf, val);
    621         break;
    622     case 2:
    623         pci_set_word(buf, val);
    624         break;
    625     case 4:
    626         pci_set_long(buf, val);
    627         break;
    628     default:
    629         /* As length is under guest control, handle illegal values. */
    630         break;
    631     }
    632 }
    633 
    634 static void virtio_write_config(PCIDevice *pci_dev, uint32_t address,
    635                                 uint32_t val, int len)
    636 {
    637     VirtIOPCIProxy *proxy = VIRTIO_PCI(pci_dev);
    638     VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
    639     struct virtio_pci_cfg_cap *cfg;
    640 
    641     pci_default_write_config(pci_dev, address, val, len);
    642 
    643     if (proxy->flags & VIRTIO_PCI_FLAG_INIT_FLR) {
    644         pcie_cap_flr_write_config(pci_dev, address, val, len);
    645     }
    646 
    647     if (range_covers_byte(address, len, PCI_COMMAND)) {
    648         if (!(pci_dev->config[PCI_COMMAND] & PCI_COMMAND_MASTER)) {
    649             virtio_set_disabled(vdev, true);
    650             virtio_pci_stop_ioeventfd(proxy);
    651             virtio_set_status(vdev, vdev->status & ~VIRTIO_CONFIG_S_DRIVER_OK);
    652         } else {
    653             virtio_set_disabled(vdev, false);
    654         }
    655     }
    656 
    657     if (proxy->config_cap &&
    658         ranges_overlap(address, len, proxy->config_cap + offsetof(struct virtio_pci_cfg_cap,
    659                                                                   pci_cfg_data),
    660                        sizeof cfg->pci_cfg_data)) {
    661         uint32_t off;
    662         uint32_t len;
    663 
    664         cfg = (void *)(proxy->pci_dev.config + proxy->config_cap);
    665         off = le32_to_cpu(cfg->cap.offset);
    666         len = le32_to_cpu(cfg->cap.length);
    667 
    668         if (len == 1 || len == 2 || len == 4) {
    669             assert(len <= sizeof cfg->pci_cfg_data);
    670             virtio_address_space_write(proxy, off, cfg->pci_cfg_data, len);
    671         }
    672     }
    673 }
    674 
    675 static uint32_t virtio_read_config(PCIDevice *pci_dev,
    676                                    uint32_t address, int len)
    677 {
    678     VirtIOPCIProxy *proxy = VIRTIO_PCI(pci_dev);
    679     struct virtio_pci_cfg_cap *cfg;
    680 
    681     if (proxy->config_cap &&
    682         ranges_overlap(address, len, proxy->config_cap + offsetof(struct virtio_pci_cfg_cap,
    683                                                                   pci_cfg_data),
    684                        sizeof cfg->pci_cfg_data)) {
    685         uint32_t off;
    686         uint32_t len;
    687 
    688         cfg = (void *)(proxy->pci_dev.config + proxy->config_cap);
    689         off = le32_to_cpu(cfg->cap.offset);
    690         len = le32_to_cpu(cfg->cap.length);
    691 
    692         if (len == 1 || len == 2 || len == 4) {
    693             assert(len <= sizeof cfg->pci_cfg_data);
    694             virtio_address_space_read(proxy, off, cfg->pci_cfg_data, len);
    695         }
    696     }
    697 
    698     return pci_default_read_config(pci_dev, address, len);
    699 }
    700 
    701 static int kvm_virtio_pci_vq_vector_use(VirtIOPCIProxy *proxy,
    702                                         unsigned int queue_no,
    703                                         unsigned int vector)
    704 {
    705     VirtIOIRQFD *irqfd = &proxy->vector_irqfd[vector];
    706     int ret;
    707 
    708     if (irqfd->users == 0) {
    709         KVMRouteChange c = kvm_irqchip_begin_route_changes(kvm_state);
    710         ret = kvm_irqchip_add_msi_route(&c, vector, &proxy->pci_dev);
    711         if (ret < 0) {
    712             return ret;
    713         }
    714         kvm_irqchip_commit_route_changes(&c);
    715         irqfd->virq = ret;
    716     }
    717     irqfd->users++;
    718     return 0;
    719 }
    720 
    721 static void kvm_virtio_pci_vq_vector_release(VirtIOPCIProxy *proxy,
    722                                              unsigned int vector)
    723 {
    724     VirtIOIRQFD *irqfd = &proxy->vector_irqfd[vector];
    725     if (--irqfd->users == 0) {
    726         kvm_irqchip_release_virq(kvm_state, irqfd->virq);
    727     }
    728 }
    729 
    730 static int kvm_virtio_pci_irqfd_use(VirtIOPCIProxy *proxy,
    731                                  unsigned int queue_no,
    732                                  unsigned int vector)
    733 {
    734     VirtIOIRQFD *irqfd = &proxy->vector_irqfd[vector];
    735     VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
    736     VirtQueue *vq = virtio_get_queue(vdev, queue_no);
    737     EventNotifier *n = virtio_queue_get_guest_notifier(vq);
    738     return kvm_irqchip_add_irqfd_notifier_gsi(kvm_state, n, NULL, irqfd->virq);
    739 }
    740 
    741 static void kvm_virtio_pci_irqfd_release(VirtIOPCIProxy *proxy,
    742                                       unsigned int queue_no,
    743                                       unsigned int vector)
    744 {
    745     VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
    746     VirtQueue *vq = virtio_get_queue(vdev, queue_no);
    747     EventNotifier *n = virtio_queue_get_guest_notifier(vq);
    748     VirtIOIRQFD *irqfd = &proxy->vector_irqfd[vector];
    749     int ret;
    750 
    751     ret = kvm_irqchip_remove_irqfd_notifier_gsi(kvm_state, n, irqfd->virq);
    752     assert(ret == 0);
    753 }
    754 
    755 static int kvm_virtio_pci_vector_use(VirtIOPCIProxy *proxy, int nvqs)
    756 {
    757     PCIDevice *dev = &proxy->pci_dev;
    758     VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
    759     VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev);
    760     unsigned int vector;
    761     int ret, queue_no;
    762 
    763     for (queue_no = 0; queue_no < nvqs; queue_no++) {
    764         if (!virtio_queue_get_num(vdev, queue_no)) {
    765             break;
    766         }
    767         vector = virtio_queue_vector(vdev, queue_no);
    768         if (vector >= msix_nr_vectors_allocated(dev)) {
    769             continue;
    770         }
    771         ret = kvm_virtio_pci_vq_vector_use(proxy, queue_no, vector);
    772         if (ret < 0) {
    773             goto undo;
    774         }
    775         /* If guest supports masking, set up irqfd now.
    776          * Otherwise, delay until unmasked in the frontend.
    777          */
    778         if (vdev->use_guest_notifier_mask && k->guest_notifier_mask) {
    779             ret = kvm_virtio_pci_irqfd_use(proxy, queue_no, vector);
    780             if (ret < 0) {
    781                 kvm_virtio_pci_vq_vector_release(proxy, vector);
    782                 goto undo;
    783             }
    784         }
    785     }
    786     return 0;
    787 
    788 undo:
    789     while (--queue_no >= 0) {
    790         vector = virtio_queue_vector(vdev, queue_no);
    791         if (vector >= msix_nr_vectors_allocated(dev)) {
    792             continue;
    793         }
    794         if (vdev->use_guest_notifier_mask && k->guest_notifier_mask) {
    795             kvm_virtio_pci_irqfd_release(proxy, queue_no, vector);
    796         }
    797         kvm_virtio_pci_vq_vector_release(proxy, vector);
    798     }
    799     return ret;
    800 }
    801 
    802 static void kvm_virtio_pci_vector_release(VirtIOPCIProxy *proxy, int nvqs)
    803 {
    804     PCIDevice *dev = &proxy->pci_dev;
    805     VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
    806     unsigned int vector;
    807     int queue_no;
    808     VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev);
    809 
    810     for (queue_no = 0; queue_no < nvqs; queue_no++) {
    811         if (!virtio_queue_get_num(vdev, queue_no)) {
    812             break;
    813         }
    814         vector = virtio_queue_vector(vdev, queue_no);
    815         if (vector >= msix_nr_vectors_allocated(dev)) {
    816             continue;
    817         }
    818         /* If guest supports masking, clean up irqfd now.
    819          * Otherwise, it was cleaned when masked in the frontend.
    820          */
    821         if (vdev->use_guest_notifier_mask && k->guest_notifier_mask) {
    822             kvm_virtio_pci_irqfd_release(proxy, queue_no, vector);
    823         }
    824         kvm_virtio_pci_vq_vector_release(proxy, vector);
    825     }
    826 }
    827 
    828 static int virtio_pci_vq_vector_unmask(VirtIOPCIProxy *proxy,
    829                                        unsigned int queue_no,
    830                                        unsigned int vector,
    831                                        MSIMessage msg)
    832 {
    833     VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
    834     VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev);
    835     VirtQueue *vq = virtio_get_queue(vdev, queue_no);
    836     EventNotifier *n = virtio_queue_get_guest_notifier(vq);
    837     VirtIOIRQFD *irqfd;
    838     int ret = 0;
    839 
    840     if (proxy->vector_irqfd) {
    841         irqfd = &proxy->vector_irqfd[vector];
    842         if (irqfd->msg.data != msg.data || irqfd->msg.address != msg.address) {
    843             ret = kvm_irqchip_update_msi_route(kvm_state, irqfd->virq, msg,
    844                                                &proxy->pci_dev);
    845             if (ret < 0) {
    846                 return ret;
    847             }
    848             kvm_irqchip_commit_routes(kvm_state);
    849         }
    850     }
    851 
    852     /* If guest supports masking, irqfd is already setup, unmask it.
    853      * Otherwise, set it up now.
    854      */
    855     if (vdev->use_guest_notifier_mask && k->guest_notifier_mask) {
    856         k->guest_notifier_mask(vdev, queue_no, false);
    857         /* Test after unmasking to avoid losing events. */
    858         if (k->guest_notifier_pending &&
    859             k->guest_notifier_pending(vdev, queue_no)) {
    860             event_notifier_set(n);
    861         }
    862     } else {
    863         ret = kvm_virtio_pci_irqfd_use(proxy, queue_no, vector);
    864     }
    865     return ret;
    866 }
    867 
    868 static void virtio_pci_vq_vector_mask(VirtIOPCIProxy *proxy,
    869                                              unsigned int queue_no,
    870                                              unsigned int vector)
    871 {
    872     VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
    873     VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev);
    874 
    875     /* If guest supports masking, keep irqfd but mask it.
    876      * Otherwise, clean it up now.
    877      */ 
    878     if (vdev->use_guest_notifier_mask && k->guest_notifier_mask) {
    879         k->guest_notifier_mask(vdev, queue_no, true);
    880     } else {
    881         kvm_virtio_pci_irqfd_release(proxy, queue_no, vector);
    882     }
    883 }
    884 
    885 static int virtio_pci_vector_unmask(PCIDevice *dev, unsigned vector,
    886                                     MSIMessage msg)
    887 {
    888     VirtIOPCIProxy *proxy = container_of(dev, VirtIOPCIProxy, pci_dev);
    889     VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
    890     VirtQueue *vq = virtio_vector_first_queue(vdev, vector);
    891     int ret, index, unmasked = 0;
    892 
    893     while (vq) {
    894         index = virtio_get_queue_index(vq);
    895         if (!virtio_queue_get_num(vdev, index)) {
    896             break;
    897         }
    898         if (index < proxy->nvqs_with_notifiers) {
    899             ret = virtio_pci_vq_vector_unmask(proxy, index, vector, msg);
    900             if (ret < 0) {
    901                 goto undo;
    902             }
    903             ++unmasked;
    904         }
    905         vq = virtio_vector_next_queue(vq);
    906     }
    907 
    908     return 0;
    909 
    910 undo:
    911     vq = virtio_vector_first_queue(vdev, vector);
    912     while (vq && unmasked >= 0) {
    913         index = virtio_get_queue_index(vq);
    914         if (index < proxy->nvqs_with_notifiers) {
    915             virtio_pci_vq_vector_mask(proxy, index, vector);
    916             --unmasked;
    917         }
    918         vq = virtio_vector_next_queue(vq);
    919     }
    920     return ret;
    921 }
    922 
    923 static void virtio_pci_vector_mask(PCIDevice *dev, unsigned vector)
    924 {
    925     VirtIOPCIProxy *proxy = container_of(dev, VirtIOPCIProxy, pci_dev);
    926     VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
    927     VirtQueue *vq = virtio_vector_first_queue(vdev, vector);
    928     int index;
    929 
    930     while (vq) {
    931         index = virtio_get_queue_index(vq);
    932         if (!virtio_queue_get_num(vdev, index)) {
    933             break;
    934         }
    935         if (index < proxy->nvqs_with_notifiers) {
    936             virtio_pci_vq_vector_mask(proxy, index, vector);
    937         }
    938         vq = virtio_vector_next_queue(vq);
    939     }
    940 }
    941 
    942 static void virtio_pci_vector_poll(PCIDevice *dev,
    943                                    unsigned int vector_start,
    944                                    unsigned int vector_end)
    945 {
    946     VirtIOPCIProxy *proxy = container_of(dev, VirtIOPCIProxy, pci_dev);
    947     VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
    948     VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev);
    949     int queue_no;
    950     unsigned int vector;
    951     EventNotifier *notifier;
    952     VirtQueue *vq;
    953 
    954     for (queue_no = 0; queue_no < proxy->nvqs_with_notifiers; queue_no++) {
    955         if (!virtio_queue_get_num(vdev, queue_no)) {
    956             break;
    957         }
    958         vector = virtio_queue_vector(vdev, queue_no);
    959         if (vector < vector_start || vector >= vector_end ||
    960             !msix_is_masked(dev, vector)) {
    961             continue;
    962         }
    963         vq = virtio_get_queue(vdev, queue_no);
    964         notifier = virtio_queue_get_guest_notifier(vq);
    965         if (k->guest_notifier_pending) {
    966             if (k->guest_notifier_pending(vdev, queue_no)) {
    967                 msix_set_pending(dev, vector);
    968             }
    969         } else if (event_notifier_test_and_clear(notifier)) {
    970             msix_set_pending(dev, vector);
    971         }
    972     }
    973 }
    974 
    975 static int virtio_pci_set_guest_notifier(DeviceState *d, int n, bool assign,
    976                                          bool with_irqfd)
    977 {
    978     VirtIOPCIProxy *proxy = to_virtio_pci_proxy(d);
    979     VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
    980     VirtioDeviceClass *vdc = VIRTIO_DEVICE_GET_CLASS(vdev);
    981     VirtQueue *vq = virtio_get_queue(vdev, n);
    982     EventNotifier *notifier = virtio_queue_get_guest_notifier(vq);
    983 
    984     if (assign) {
    985         int r = event_notifier_init(notifier, 0);
    986         if (r < 0) {
    987             return r;
    988         }
    989         virtio_queue_set_guest_notifier_fd_handler(vq, true, with_irqfd);
    990     } else {
    991         virtio_queue_set_guest_notifier_fd_handler(vq, false, with_irqfd);
    992         event_notifier_cleanup(notifier);
    993     }
    994 
    995     if (!msix_enabled(&proxy->pci_dev) &&
    996         vdev->use_guest_notifier_mask &&
    997         vdc->guest_notifier_mask) {
    998         vdc->guest_notifier_mask(vdev, n, !assign);
    999     }
   1000 
   1001     return 0;
   1002 }
   1003 
   1004 static bool virtio_pci_query_guest_notifiers(DeviceState *d)
   1005 {
   1006     VirtIOPCIProxy *proxy = to_virtio_pci_proxy(d);
   1007     return msix_enabled(&proxy->pci_dev);
   1008 }
   1009 
   1010 static int virtio_pci_set_guest_notifiers(DeviceState *d, int nvqs, bool assign)
   1011 {
   1012     VirtIOPCIProxy *proxy = to_virtio_pci_proxy(d);
   1013     VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
   1014     VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev);
   1015     int r, n;
   1016     bool with_irqfd = msix_enabled(&proxy->pci_dev) &&
   1017         kvm_msi_via_irqfd_enabled();
   1018 
   1019     nvqs = MIN(nvqs, VIRTIO_QUEUE_MAX);
   1020 
   1021     /*
   1022      * When deassigning, pass a consistent nvqs value to avoid leaking
   1023      * notifiers. But first check we've actually been configured, exit
   1024      * early if we haven't.
   1025      */
   1026     if (!assign && !proxy->nvqs_with_notifiers) {
   1027         return 0;
   1028     }
   1029     assert(assign || nvqs == proxy->nvqs_with_notifiers);
   1030 
   1031     proxy->nvqs_with_notifiers = nvqs;
   1032 
   1033     /* Must unset vector notifier while guest notifier is still assigned */
   1034     if ((proxy->vector_irqfd || k->guest_notifier_mask) && !assign) {
   1035         msix_unset_vector_notifiers(&proxy->pci_dev);
   1036         if (proxy->vector_irqfd) {
   1037             kvm_virtio_pci_vector_release(proxy, nvqs);
   1038             g_free(proxy->vector_irqfd);
   1039             proxy->vector_irqfd = NULL;
   1040         }
   1041     }
   1042 
   1043     for (n = 0; n < nvqs; n++) {
   1044         if (!virtio_queue_get_num(vdev, n)) {
   1045             break;
   1046         }
   1047 
   1048         r = virtio_pci_set_guest_notifier(d, n, assign, with_irqfd);
   1049         if (r < 0) {
   1050             goto assign_error;
   1051         }
   1052     }
   1053 
   1054     /* Must set vector notifier after guest notifier has been assigned */
   1055     if ((with_irqfd || k->guest_notifier_mask) && assign) {
   1056         if (with_irqfd) {
   1057             proxy->vector_irqfd =
   1058                 g_malloc0(sizeof(*proxy->vector_irqfd) *
   1059                           msix_nr_vectors_allocated(&proxy->pci_dev));
   1060             r = kvm_virtio_pci_vector_use(proxy, nvqs);
   1061             if (r < 0) {
   1062                 goto assign_error;
   1063             }
   1064         }
   1065         r = msix_set_vector_notifiers(&proxy->pci_dev,
   1066                                       virtio_pci_vector_unmask,
   1067                                       virtio_pci_vector_mask,
   1068                                       virtio_pci_vector_poll);
   1069         if (r < 0) {
   1070             goto notifiers_error;
   1071         }
   1072     }
   1073 
   1074     return 0;
   1075 
   1076 notifiers_error:
   1077     if (with_irqfd) {
   1078         assert(assign);
   1079         kvm_virtio_pci_vector_release(proxy, nvqs);
   1080     }
   1081 
   1082 assign_error:
   1083     /* We get here on assignment failure. Recover by undoing for VQs 0 .. n. */
   1084     assert(assign);
   1085     while (--n >= 0) {
   1086         virtio_pci_set_guest_notifier(d, n, !assign, with_irqfd);
   1087     }
   1088     return r;
   1089 }
   1090 
   1091 static int virtio_pci_set_host_notifier_mr(DeviceState *d, int n,
   1092                                            MemoryRegion *mr, bool assign)
   1093 {
   1094     VirtIOPCIProxy *proxy = to_virtio_pci_proxy(d);
   1095     int offset;
   1096 
   1097     if (n >= VIRTIO_QUEUE_MAX || !virtio_pci_modern(proxy) ||
   1098         virtio_pci_queue_mem_mult(proxy) != memory_region_size(mr)) {
   1099         return -1;
   1100     }
   1101 
   1102     if (assign) {
   1103         offset = virtio_pci_queue_mem_mult(proxy) * n;
   1104         memory_region_add_subregion_overlap(&proxy->notify.mr, offset, mr, 1);
   1105     } else {
   1106         memory_region_del_subregion(&proxy->notify.mr, mr);
   1107     }
   1108 
   1109     return 0;
   1110 }
   1111 
   1112 static void virtio_pci_vmstate_change(DeviceState *d, bool running)
   1113 {
   1114     VirtIOPCIProxy *proxy = to_virtio_pci_proxy(d);
   1115     VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
   1116 
   1117     if (running) {
   1118         /* Old QEMU versions did not set bus master enable on status write.
   1119          * Detect DRIVER set and enable it.
   1120          */
   1121         if ((proxy->flags & VIRTIO_PCI_FLAG_BUS_MASTER_BUG_MIGRATION) &&
   1122             (vdev->status & VIRTIO_CONFIG_S_DRIVER) &&
   1123             !(proxy->pci_dev.config[PCI_COMMAND] & PCI_COMMAND_MASTER)) {
   1124             pci_default_write_config(&proxy->pci_dev, PCI_COMMAND,
   1125                                      proxy->pci_dev.config[PCI_COMMAND] |
   1126                                      PCI_COMMAND_MASTER, 1);
   1127         }
   1128         virtio_pci_start_ioeventfd(proxy);
   1129     } else {
   1130         virtio_pci_stop_ioeventfd(proxy);
   1131     }
   1132 }
   1133 
   1134 /*
   1135  * virtio-pci: This is the PCIDevice which has a virtio-pci-bus.
   1136  */
   1137 
   1138 static int virtio_pci_query_nvectors(DeviceState *d)
   1139 {
   1140     VirtIOPCIProxy *proxy = VIRTIO_PCI(d);
   1141 
   1142     return proxy->nvectors;
   1143 }
   1144 
   1145 static AddressSpace *virtio_pci_get_dma_as(DeviceState *d)
   1146 {
   1147     VirtIOPCIProxy *proxy = VIRTIO_PCI(d);
   1148     PCIDevice *dev = &proxy->pci_dev;
   1149 
   1150     return pci_get_address_space(dev);
   1151 }
   1152 
   1153 static bool virtio_pci_iommu_enabled(DeviceState *d)
   1154 {
   1155     VirtIOPCIProxy *proxy = VIRTIO_PCI(d);
   1156     PCIDevice *dev = &proxy->pci_dev;
   1157     AddressSpace *dma_as = pci_device_iommu_address_space(dev);
   1158 
   1159     if (dma_as == &address_space_memory) {
   1160         return false;
   1161     }
   1162 
   1163     return true;
   1164 }
   1165 
   1166 static bool virtio_pci_queue_enabled(DeviceState *d, int n)
   1167 {
   1168     VirtIOPCIProxy *proxy = VIRTIO_PCI(d);
   1169     VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
   1170 
   1171     if (virtio_vdev_has_feature(vdev, VIRTIO_F_VERSION_1)) {
   1172         return proxy->vqs[n].enabled;
   1173     }
   1174 
   1175     return virtio_queue_enabled_legacy(vdev, n);
   1176 }
   1177 
   1178 static int virtio_pci_add_mem_cap(VirtIOPCIProxy *proxy,
   1179                                    struct virtio_pci_cap *cap)
   1180 {
   1181     PCIDevice *dev = &proxy->pci_dev;
   1182     int offset;
   1183 
   1184     offset = pci_add_capability(dev, PCI_CAP_ID_VNDR, 0,
   1185                                 cap->cap_len, &error_abort);
   1186 
   1187     assert(cap->cap_len >= sizeof *cap);
   1188     memcpy(dev->config + offset + PCI_CAP_FLAGS, &cap->cap_len,
   1189            cap->cap_len - PCI_CAP_FLAGS);
   1190 
   1191     return offset;
   1192 }
   1193 
   1194 static uint64_t virtio_pci_common_read(void *opaque, hwaddr addr,
   1195                                        unsigned size)
   1196 {
   1197     VirtIOPCIProxy *proxy = opaque;
   1198     VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
   1199     uint32_t val = 0;
   1200     int i;
   1201 
   1202     if (vdev == NULL) {
   1203         return UINT64_MAX;
   1204     }
   1205 
   1206     switch (addr) {
   1207     case VIRTIO_PCI_COMMON_DFSELECT:
   1208         val = proxy->dfselect;
   1209         break;
   1210     case VIRTIO_PCI_COMMON_DF:
   1211         if (proxy->dfselect <= 1) {
   1212             VirtioDeviceClass *vdc = VIRTIO_DEVICE_GET_CLASS(vdev);
   1213 
   1214             val = (vdev->host_features & ~vdc->legacy_features) >>
   1215                 (32 * proxy->dfselect);
   1216         }
   1217         break;
   1218     case VIRTIO_PCI_COMMON_GFSELECT:
   1219         val = proxy->gfselect;
   1220         break;
   1221     case VIRTIO_PCI_COMMON_GF:
   1222         if (proxy->gfselect < ARRAY_SIZE(proxy->guest_features)) {
   1223             val = proxy->guest_features[proxy->gfselect];
   1224         }
   1225         break;
   1226     case VIRTIO_PCI_COMMON_MSIX:
   1227         val = vdev->config_vector;
   1228         break;
   1229     case VIRTIO_PCI_COMMON_NUMQ:
   1230         for (i = 0; i < VIRTIO_QUEUE_MAX; ++i) {
   1231             if (virtio_queue_get_num(vdev, i)) {
   1232                 val = i + 1;
   1233             }
   1234         }
   1235         break;
   1236     case VIRTIO_PCI_COMMON_STATUS:
   1237         val = vdev->status;
   1238         break;
   1239     case VIRTIO_PCI_COMMON_CFGGENERATION:
   1240         val = vdev->generation;
   1241         break;
   1242     case VIRTIO_PCI_COMMON_Q_SELECT:
   1243         val = vdev->queue_sel;
   1244         break;
   1245     case VIRTIO_PCI_COMMON_Q_SIZE:
   1246         val = virtio_queue_get_num(vdev, vdev->queue_sel);
   1247         break;
   1248     case VIRTIO_PCI_COMMON_Q_MSIX:
   1249         val = virtio_queue_vector(vdev, vdev->queue_sel);
   1250         break;
   1251     case VIRTIO_PCI_COMMON_Q_ENABLE:
   1252         val = proxy->vqs[vdev->queue_sel].enabled;
   1253         break;
   1254     case VIRTIO_PCI_COMMON_Q_NOFF:
   1255         /* Simply map queues in order */
   1256         val = vdev->queue_sel;
   1257         break;
   1258     case VIRTIO_PCI_COMMON_Q_DESCLO:
   1259         val = proxy->vqs[vdev->queue_sel].desc[0];
   1260         break;
   1261     case VIRTIO_PCI_COMMON_Q_DESCHI:
   1262         val = proxy->vqs[vdev->queue_sel].desc[1];
   1263         break;
   1264     case VIRTIO_PCI_COMMON_Q_AVAILLO:
   1265         val = proxy->vqs[vdev->queue_sel].avail[0];
   1266         break;
   1267     case VIRTIO_PCI_COMMON_Q_AVAILHI:
   1268         val = proxy->vqs[vdev->queue_sel].avail[1];
   1269         break;
   1270     case VIRTIO_PCI_COMMON_Q_USEDLO:
   1271         val = proxy->vqs[vdev->queue_sel].used[0];
   1272         break;
   1273     case VIRTIO_PCI_COMMON_Q_USEDHI:
   1274         val = proxy->vqs[vdev->queue_sel].used[1];
   1275         break;
   1276     case VIRTIO_PCI_COMMON_Q_RESET:
   1277         val = proxy->vqs[vdev->queue_sel].reset;
   1278         break;
   1279     default:
   1280         val = 0;
   1281     }
   1282 
   1283     return val;
   1284 }
   1285 
   1286 static void virtio_pci_common_write(void *opaque, hwaddr addr,
   1287                                     uint64_t val, unsigned size)
   1288 {
   1289     VirtIOPCIProxy *proxy = opaque;
   1290     VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
   1291     uint16_t vector;
   1292 
   1293     if (vdev == NULL) {
   1294         return;
   1295     }
   1296 
   1297     switch (addr) {
   1298     case VIRTIO_PCI_COMMON_DFSELECT:
   1299         proxy->dfselect = val;
   1300         break;
   1301     case VIRTIO_PCI_COMMON_GFSELECT:
   1302         proxy->gfselect = val;
   1303         break;
   1304     case VIRTIO_PCI_COMMON_GF:
   1305         if (proxy->gfselect < ARRAY_SIZE(proxy->guest_features)) {
   1306             proxy->guest_features[proxy->gfselect] = val;
   1307             virtio_set_features(vdev,
   1308                                 (((uint64_t)proxy->guest_features[1]) << 32) |
   1309                                 proxy->guest_features[0]);
   1310         }
   1311         break;
   1312     case VIRTIO_PCI_COMMON_MSIX:
   1313         if (vdev->config_vector != VIRTIO_NO_VECTOR) {
   1314             msix_vector_unuse(&proxy->pci_dev, vdev->config_vector);
   1315         }
   1316         /* Make it possible for guest to discover an error took place. */
   1317         if (val < proxy->nvectors) {
   1318             msix_vector_use(&proxy->pci_dev, val);
   1319         } else {
   1320             val = VIRTIO_NO_VECTOR;
   1321         }
   1322         vdev->config_vector = val;
   1323         break;
   1324     case VIRTIO_PCI_COMMON_STATUS:
   1325         if (!(val & VIRTIO_CONFIG_S_DRIVER_OK)) {
   1326             virtio_pci_stop_ioeventfd(proxy);
   1327         }
   1328 
   1329         virtio_set_status(vdev, val & 0xFF);
   1330 
   1331         if (val & VIRTIO_CONFIG_S_DRIVER_OK) {
   1332             virtio_pci_start_ioeventfd(proxy);
   1333         }
   1334 
   1335         if (vdev->status == 0) {
   1336             virtio_pci_reset(DEVICE(proxy));
   1337         }
   1338 
   1339         break;
   1340     case VIRTIO_PCI_COMMON_Q_SELECT:
   1341         if (val < VIRTIO_QUEUE_MAX) {
   1342             vdev->queue_sel = val;
   1343         }
   1344         break;
   1345     case VIRTIO_PCI_COMMON_Q_SIZE:
   1346         proxy->vqs[vdev->queue_sel].num = val;
   1347         virtio_queue_set_num(vdev, vdev->queue_sel,
   1348                              proxy->vqs[vdev->queue_sel].num);
   1349         break;
   1350     case VIRTIO_PCI_COMMON_Q_MSIX:
   1351         vector = virtio_queue_vector(vdev, vdev->queue_sel);
   1352         if (vector != VIRTIO_NO_VECTOR) {
   1353             msix_vector_unuse(&proxy->pci_dev, vector);
   1354         }
   1355         /* Make it possible for guest to discover an error took place. */
   1356         if (val < proxy->nvectors) {
   1357             msix_vector_use(&proxy->pci_dev, val);
   1358         } else {
   1359             val = VIRTIO_NO_VECTOR;
   1360         }
   1361         virtio_queue_set_vector(vdev, vdev->queue_sel, val);
   1362         break;
   1363     case VIRTIO_PCI_COMMON_Q_ENABLE:
   1364         if (val == 1) {
   1365             virtio_queue_set_num(vdev, vdev->queue_sel,
   1366                                  proxy->vqs[vdev->queue_sel].num);
   1367             virtio_queue_set_rings(vdev, vdev->queue_sel,
   1368                        ((uint64_t)proxy->vqs[vdev->queue_sel].desc[1]) << 32 |
   1369                        proxy->vqs[vdev->queue_sel].desc[0],
   1370                        ((uint64_t)proxy->vqs[vdev->queue_sel].avail[1]) << 32 |
   1371                        proxy->vqs[vdev->queue_sel].avail[0],
   1372                        ((uint64_t)proxy->vqs[vdev->queue_sel].used[1]) << 32 |
   1373                        proxy->vqs[vdev->queue_sel].used[0]);
   1374             proxy->vqs[vdev->queue_sel].enabled = 1;
   1375             proxy->vqs[vdev->queue_sel].reset = 0;
   1376             virtio_queue_enable(vdev, vdev->queue_sel);
   1377         } else {
   1378             virtio_error(vdev, "wrong value for queue_enable %"PRIx64, val);
   1379         }
   1380         break;
   1381     case VIRTIO_PCI_COMMON_Q_DESCLO:
   1382         proxy->vqs[vdev->queue_sel].desc[0] = val;
   1383         break;
   1384     case VIRTIO_PCI_COMMON_Q_DESCHI:
   1385         proxy->vqs[vdev->queue_sel].desc[1] = val;
   1386         break;
   1387     case VIRTIO_PCI_COMMON_Q_AVAILLO:
   1388         proxy->vqs[vdev->queue_sel].avail[0] = val;
   1389         break;
   1390     case VIRTIO_PCI_COMMON_Q_AVAILHI:
   1391         proxy->vqs[vdev->queue_sel].avail[1] = val;
   1392         break;
   1393     case VIRTIO_PCI_COMMON_Q_USEDLO:
   1394         proxy->vqs[vdev->queue_sel].used[0] = val;
   1395         break;
   1396     case VIRTIO_PCI_COMMON_Q_USEDHI:
   1397         proxy->vqs[vdev->queue_sel].used[1] = val;
   1398         break;
   1399     case VIRTIO_PCI_COMMON_Q_RESET:
   1400         if (val == 1) {
   1401             proxy->vqs[vdev->queue_sel].reset = 1;
   1402 
   1403             virtio_queue_reset(vdev, vdev->queue_sel);
   1404 
   1405             proxy->vqs[vdev->queue_sel].reset = 0;
   1406             proxy->vqs[vdev->queue_sel].enabled = 0;
   1407         }
   1408         break;
   1409     default:
   1410         break;
   1411     }
   1412 }
   1413 
   1414 
   1415 static uint64_t virtio_pci_notify_read(void *opaque, hwaddr addr,
   1416                                        unsigned size)
   1417 {
   1418     VirtIOPCIProxy *proxy = opaque;
   1419     if (virtio_bus_get_device(&proxy->bus) == NULL) {
   1420         return UINT64_MAX;
   1421     }
   1422 
   1423     return 0;
   1424 }
   1425 
   1426 static void virtio_pci_notify_write(void *opaque, hwaddr addr,
   1427                                     uint64_t val, unsigned size)
   1428 {
   1429     VirtIOPCIProxy *proxy = opaque;
   1430     VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
   1431 
   1432     unsigned queue = addr / virtio_pci_queue_mem_mult(proxy);
   1433 
   1434     if (vdev != NULL && queue < VIRTIO_QUEUE_MAX) {
   1435         trace_virtio_pci_notify_write(addr, val, size);
   1436         virtio_queue_notify(vdev, queue);
   1437     }
   1438 }
   1439 
   1440 static void virtio_pci_notify_write_pio(void *opaque, hwaddr addr,
   1441                                         uint64_t val, unsigned size)
   1442 {
   1443     VirtIOPCIProxy *proxy = opaque;
   1444     VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
   1445 
   1446     unsigned queue = val;
   1447 
   1448     if (vdev != NULL && queue < VIRTIO_QUEUE_MAX) {
   1449         trace_virtio_pci_notify_write_pio(addr, val, size);
   1450         virtio_queue_notify(vdev, queue);
   1451     }
   1452 }
   1453 
   1454 static uint64_t virtio_pci_isr_read(void *opaque, hwaddr addr,
   1455                                     unsigned size)
   1456 {
   1457     VirtIOPCIProxy *proxy = opaque;
   1458     VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
   1459     uint64_t val;
   1460 
   1461     if (vdev == NULL) {
   1462         return UINT64_MAX;
   1463     }
   1464 
   1465     val = qatomic_xchg(&vdev->isr, 0);
   1466     pci_irq_deassert(&proxy->pci_dev);
   1467     return val;
   1468 }
   1469 
   1470 static void virtio_pci_isr_write(void *opaque, hwaddr addr,
   1471                                  uint64_t val, unsigned size)
   1472 {
   1473 }
   1474 
   1475 static uint64_t virtio_pci_device_read(void *opaque, hwaddr addr,
   1476                                        unsigned size)
   1477 {
   1478     VirtIOPCIProxy *proxy = opaque;
   1479     VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
   1480     uint64_t val;
   1481 
   1482     if (vdev == NULL) {
   1483         return UINT64_MAX;
   1484     }
   1485 
   1486     switch (size) {
   1487     case 1:
   1488         val = virtio_config_modern_readb(vdev, addr);
   1489         break;
   1490     case 2:
   1491         val = virtio_config_modern_readw(vdev, addr);
   1492         break;
   1493     case 4:
   1494         val = virtio_config_modern_readl(vdev, addr);
   1495         break;
   1496     default:
   1497         val = 0;
   1498         break;
   1499     }
   1500     return val;
   1501 }
   1502 
   1503 static void virtio_pci_device_write(void *opaque, hwaddr addr,
   1504                                     uint64_t val, unsigned size)
   1505 {
   1506     VirtIOPCIProxy *proxy = opaque;
   1507     VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
   1508 
   1509     if (vdev == NULL) {
   1510         return;
   1511     }
   1512 
   1513     switch (size) {
   1514     case 1:
   1515         virtio_config_modern_writeb(vdev, addr, val);
   1516         break;
   1517     case 2:
   1518         virtio_config_modern_writew(vdev, addr, val);
   1519         break;
   1520     case 4:
   1521         virtio_config_modern_writel(vdev, addr, val);
   1522         break;
   1523     }
   1524 }
   1525 
   1526 static void virtio_pci_modern_regions_init(VirtIOPCIProxy *proxy,
   1527                                            const char *vdev_name)
   1528 {
   1529     static const MemoryRegionOps common_ops = {
   1530         .read = virtio_pci_common_read,
   1531         .write = virtio_pci_common_write,
   1532         .impl = {
   1533             .min_access_size = 1,
   1534             .max_access_size = 4,
   1535         },
   1536         .endianness = DEVICE_LITTLE_ENDIAN,
   1537     };
   1538     static const MemoryRegionOps isr_ops = {
   1539         .read = virtio_pci_isr_read,
   1540         .write = virtio_pci_isr_write,
   1541         .impl = {
   1542             .min_access_size = 1,
   1543             .max_access_size = 4,
   1544         },
   1545         .endianness = DEVICE_LITTLE_ENDIAN,
   1546     };
   1547     static const MemoryRegionOps device_ops = {
   1548         .read = virtio_pci_device_read,
   1549         .write = virtio_pci_device_write,
   1550         .impl = {
   1551             .min_access_size = 1,
   1552             .max_access_size = 4,
   1553         },
   1554         .endianness = DEVICE_LITTLE_ENDIAN,
   1555     };
   1556     static const MemoryRegionOps notify_ops = {
   1557         .read = virtio_pci_notify_read,
   1558         .write = virtio_pci_notify_write,
   1559         .impl = {
   1560             .min_access_size = 1,
   1561             .max_access_size = 4,
   1562         },
   1563         .endianness = DEVICE_LITTLE_ENDIAN,
   1564     };
   1565     static const MemoryRegionOps notify_pio_ops = {
   1566         .read = virtio_pci_notify_read,
   1567         .write = virtio_pci_notify_write_pio,
   1568         .impl = {
   1569             .min_access_size = 1,
   1570             .max_access_size = 4,
   1571         },
   1572         .endianness = DEVICE_LITTLE_ENDIAN,
   1573     };
   1574     g_autoptr(GString) name = g_string_new(NULL);
   1575 
   1576     g_string_printf(name, "virtio-pci-common-%s", vdev_name);
   1577     memory_region_init_io(&proxy->common.mr, OBJECT(proxy),
   1578                           &common_ops,
   1579                           proxy,
   1580                           name->str,
   1581                           proxy->common.size);
   1582 
   1583     g_string_printf(name, "virtio-pci-isr-%s", vdev_name);
   1584     memory_region_init_io(&proxy->isr.mr, OBJECT(proxy),
   1585                           &isr_ops,
   1586                           proxy,
   1587                           name->str,
   1588                           proxy->isr.size);
   1589 
   1590     g_string_printf(name, "virtio-pci-device-%s", vdev_name);
   1591     memory_region_init_io(&proxy->device.mr, OBJECT(proxy),
   1592                           &device_ops,
   1593                           proxy,
   1594                           name->str,
   1595                           proxy->device.size);
   1596 
   1597     g_string_printf(name, "virtio-pci-notify-%s", vdev_name);
   1598     memory_region_init_io(&proxy->notify.mr, OBJECT(proxy),
   1599                           &notify_ops,
   1600                           proxy,
   1601                           name->str,
   1602                           proxy->notify.size);
   1603 
   1604     g_string_printf(name, "virtio-pci-notify-pio-%s", vdev_name);
   1605     memory_region_init_io(&proxy->notify_pio.mr, OBJECT(proxy),
   1606                           &notify_pio_ops,
   1607                           proxy,
   1608                           name->str,
   1609                           proxy->notify_pio.size);
   1610 }
   1611 
   1612 static void virtio_pci_modern_region_map(VirtIOPCIProxy *proxy,
   1613                                          VirtIOPCIRegion *region,
   1614                                          struct virtio_pci_cap *cap,
   1615                                          MemoryRegion *mr,
   1616                                          uint8_t bar)
   1617 {
   1618     memory_region_add_subregion(mr, region->offset, &region->mr);
   1619 
   1620     cap->cfg_type = region->type;
   1621     cap->bar = bar;
   1622     cap->offset = cpu_to_le32(region->offset);
   1623     cap->length = cpu_to_le32(region->size);
   1624     virtio_pci_add_mem_cap(proxy, cap);
   1625 
   1626 }
   1627 
   1628 static void virtio_pci_modern_mem_region_map(VirtIOPCIProxy *proxy,
   1629                                              VirtIOPCIRegion *region,
   1630                                              struct virtio_pci_cap *cap)
   1631 {
   1632     virtio_pci_modern_region_map(proxy, region, cap,
   1633                                  &proxy->modern_bar, proxy->modern_mem_bar_idx);
   1634 }
   1635 
   1636 static void virtio_pci_modern_io_region_map(VirtIOPCIProxy *proxy,
   1637                                             VirtIOPCIRegion *region,
   1638                                             struct virtio_pci_cap *cap)
   1639 {
   1640     virtio_pci_modern_region_map(proxy, region, cap,
   1641                                  &proxy->io_bar, proxy->modern_io_bar_idx);
   1642 }
   1643 
   1644 static void virtio_pci_modern_mem_region_unmap(VirtIOPCIProxy *proxy,
   1645                                                VirtIOPCIRegion *region)
   1646 {
   1647     memory_region_del_subregion(&proxy->modern_bar,
   1648                                 &region->mr);
   1649 }
   1650 
   1651 static void virtio_pci_modern_io_region_unmap(VirtIOPCIProxy *proxy,
   1652                                               VirtIOPCIRegion *region)
   1653 {
   1654     memory_region_del_subregion(&proxy->io_bar,
   1655                                 &region->mr);
   1656 }
   1657 
   1658 static void virtio_pci_pre_plugged(DeviceState *d, Error **errp)
   1659 {
   1660     VirtIOPCIProxy *proxy = VIRTIO_PCI(d);
   1661     VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
   1662 
   1663     if (virtio_pci_modern(proxy)) {
   1664         virtio_add_feature(&vdev->host_features, VIRTIO_F_VERSION_1);
   1665     }
   1666 
   1667     virtio_add_feature(&vdev->host_features, VIRTIO_F_BAD_FEATURE);
   1668 }
   1669 
   1670 /* This is called by virtio-bus just after the device is plugged. */
   1671 static void virtio_pci_device_plugged(DeviceState *d, Error **errp)
   1672 {
   1673     VirtIOPCIProxy *proxy = VIRTIO_PCI(d);
   1674     VirtioBusState *bus = &proxy->bus;
   1675     bool legacy = virtio_pci_legacy(proxy);
   1676     bool modern;
   1677     bool modern_pio = proxy->flags & VIRTIO_PCI_FLAG_MODERN_PIO_NOTIFY;
   1678     uint8_t *config;
   1679     uint32_t size;
   1680     VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
   1681 
   1682     /*
   1683      * Virtio capabilities present without
   1684      * VIRTIO_F_VERSION_1 confuses guests
   1685      */
   1686     if (!proxy->ignore_backend_features &&
   1687             !virtio_has_feature(vdev->host_features, VIRTIO_F_VERSION_1)) {
   1688         virtio_pci_disable_modern(proxy);
   1689 
   1690         if (!legacy) {
   1691             error_setg(errp, "Device doesn't support modern mode, and legacy"
   1692                              " mode is disabled");
   1693             error_append_hint(errp, "Set disable-legacy to off\n");
   1694 
   1695             return;
   1696         }
   1697     }
   1698 
   1699     modern = virtio_pci_modern(proxy);
   1700 
   1701     config = proxy->pci_dev.config;
   1702     if (proxy->class_code) {
   1703         pci_config_set_class(config, proxy->class_code);
   1704     }
   1705 
   1706     if (legacy) {
   1707         if (!virtio_legacy_allowed(vdev)) {
   1708             /*
   1709              * To avoid migration issues, we allow legacy mode when legacy
   1710              * check is disabled in the old machine types (< 5.1).
   1711              */
   1712             if (virtio_legacy_check_disabled(vdev)) {
   1713                 warn_report("device is modern-only, but for backward "
   1714                             "compatibility legacy is allowed");
   1715             } else {
   1716                 error_setg(errp,
   1717                            "device is modern-only, use disable-legacy=on");
   1718                 return;
   1719             }
   1720         }
   1721         if (virtio_host_has_feature(vdev, VIRTIO_F_IOMMU_PLATFORM)) {
   1722             error_setg(errp, "VIRTIO_F_IOMMU_PLATFORM was supported by"
   1723                        " neither legacy nor transitional device");
   1724             return;
   1725         }
   1726         /*
   1727          * Legacy and transitional devices use specific subsystem IDs.
   1728          * Note that the subsystem vendor ID (config + PCI_SUBSYSTEM_VENDOR_ID)
   1729          * is set to PCI_SUBVENDOR_ID_REDHAT_QUMRANET by default.
   1730          */
   1731         pci_set_word(config + PCI_SUBSYSTEM_ID, virtio_bus_get_vdev_id(bus));
   1732     } else {
   1733         /* pure virtio-1.0 */
   1734         pci_set_word(config + PCI_VENDOR_ID,
   1735                      PCI_VENDOR_ID_REDHAT_QUMRANET);
   1736         pci_set_word(config + PCI_DEVICE_ID,
   1737                      PCI_DEVICE_ID_VIRTIO_10_BASE + virtio_bus_get_vdev_id(bus));
   1738         pci_config_set_revision(config, 1);
   1739     }
   1740     config[PCI_INTERRUPT_PIN] = 1;
   1741 
   1742 
   1743     if (modern) {
   1744         struct virtio_pci_cap cap = {
   1745             .cap_len = sizeof cap,
   1746         };
   1747         struct virtio_pci_notify_cap notify = {
   1748             .cap.cap_len = sizeof notify,
   1749             .notify_off_multiplier =
   1750                 cpu_to_le32(virtio_pci_queue_mem_mult(proxy)),
   1751         };
   1752         struct virtio_pci_cfg_cap cfg = {
   1753             .cap.cap_len = sizeof cfg,
   1754             .cap.cfg_type = VIRTIO_PCI_CAP_PCI_CFG,
   1755         };
   1756         struct virtio_pci_notify_cap notify_pio = {
   1757             .cap.cap_len = sizeof notify,
   1758             .notify_off_multiplier = cpu_to_le32(0x0),
   1759         };
   1760 
   1761         struct virtio_pci_cfg_cap *cfg_mask;
   1762 
   1763         virtio_pci_modern_regions_init(proxy, vdev->name);
   1764 
   1765         virtio_pci_modern_mem_region_map(proxy, &proxy->common, &cap);
   1766         virtio_pci_modern_mem_region_map(proxy, &proxy->isr, &cap);
   1767         virtio_pci_modern_mem_region_map(proxy, &proxy->device, &cap);
   1768         virtio_pci_modern_mem_region_map(proxy, &proxy->notify, &notify.cap);
   1769 
   1770         if (modern_pio) {
   1771             memory_region_init(&proxy->io_bar, OBJECT(proxy),
   1772                                "virtio-pci-io", 0x4);
   1773 
   1774             pci_register_bar(&proxy->pci_dev, proxy->modern_io_bar_idx,
   1775                              PCI_BASE_ADDRESS_SPACE_IO, &proxy->io_bar);
   1776 
   1777             virtio_pci_modern_io_region_map(proxy, &proxy->notify_pio,
   1778                                             &notify_pio.cap);
   1779         }
   1780 
   1781         pci_register_bar(&proxy->pci_dev, proxy->modern_mem_bar_idx,
   1782                          PCI_BASE_ADDRESS_SPACE_MEMORY |
   1783                          PCI_BASE_ADDRESS_MEM_PREFETCH |
   1784                          PCI_BASE_ADDRESS_MEM_TYPE_64,
   1785                          &proxy->modern_bar);
   1786 
   1787         proxy->config_cap = virtio_pci_add_mem_cap(proxy, &cfg.cap);
   1788         cfg_mask = (void *)(proxy->pci_dev.wmask + proxy->config_cap);
   1789         pci_set_byte(&cfg_mask->cap.bar, ~0x0);
   1790         pci_set_long((uint8_t *)&cfg_mask->cap.offset, ~0x0);
   1791         pci_set_long((uint8_t *)&cfg_mask->cap.length, ~0x0);
   1792         pci_set_long(cfg_mask->pci_cfg_data, ~0x0);
   1793     }
   1794 
   1795     if (proxy->nvectors) {
   1796         int err = msix_init_exclusive_bar(&proxy->pci_dev, proxy->nvectors,
   1797                                           proxy->msix_bar_idx, NULL);
   1798         if (err) {
   1799             /* Notice when a system that supports MSIx can't initialize it */
   1800             if (err != -ENOTSUP) {
   1801                 warn_report("unable to init msix vectors to %" PRIu32,
   1802                             proxy->nvectors);
   1803             }
   1804             proxy->nvectors = 0;
   1805         }
   1806     }
   1807 
   1808     proxy->pci_dev.config_write = virtio_write_config;
   1809     proxy->pci_dev.config_read = virtio_read_config;
   1810 
   1811     if (legacy) {
   1812         size = VIRTIO_PCI_REGION_SIZE(&proxy->pci_dev)
   1813             + virtio_bus_get_vdev_config_len(bus);
   1814         size = pow2ceil(size);
   1815 
   1816         memory_region_init_io(&proxy->bar, OBJECT(proxy),
   1817                               &virtio_pci_config_ops,
   1818                               proxy, "virtio-pci", size);
   1819 
   1820         pci_register_bar(&proxy->pci_dev, proxy->legacy_io_bar_idx,
   1821                          PCI_BASE_ADDRESS_SPACE_IO, &proxy->bar);
   1822     }
   1823 }
   1824 
   1825 static void virtio_pci_device_unplugged(DeviceState *d)
   1826 {
   1827     VirtIOPCIProxy *proxy = VIRTIO_PCI(d);
   1828     bool modern = virtio_pci_modern(proxy);
   1829     bool modern_pio = proxy->flags & VIRTIO_PCI_FLAG_MODERN_PIO_NOTIFY;
   1830 
   1831     virtio_pci_stop_ioeventfd(proxy);
   1832 
   1833     if (modern) {
   1834         virtio_pci_modern_mem_region_unmap(proxy, &proxy->common);
   1835         virtio_pci_modern_mem_region_unmap(proxy, &proxy->isr);
   1836         virtio_pci_modern_mem_region_unmap(proxy, &proxy->device);
   1837         virtio_pci_modern_mem_region_unmap(proxy, &proxy->notify);
   1838         if (modern_pio) {
   1839             virtio_pci_modern_io_region_unmap(proxy, &proxy->notify_pio);
   1840         }
   1841     }
   1842 }
   1843 
   1844 static void virtio_pci_realize(PCIDevice *pci_dev, Error **errp)
   1845 {
   1846     VirtIOPCIProxy *proxy = VIRTIO_PCI(pci_dev);
   1847     VirtioPCIClass *k = VIRTIO_PCI_GET_CLASS(pci_dev);
   1848     bool pcie_port = pci_bus_is_express(pci_get_bus(pci_dev)) &&
   1849                      !pci_bus_is_root(pci_get_bus(pci_dev));
   1850 
   1851     if (kvm_enabled() && !kvm_has_many_ioeventfds()) {
   1852         proxy->flags &= ~VIRTIO_PCI_FLAG_USE_IOEVENTFD;
   1853     }
   1854 
   1855     /* fd-based ioevents can't be synchronized in record/replay */
   1856     if (replay_mode != REPLAY_MODE_NONE) {
   1857         proxy->flags &= ~VIRTIO_PCI_FLAG_USE_IOEVENTFD;
   1858     }
   1859 
   1860     /*
   1861      * virtio pci bar layout used by default.
   1862      * subclasses can re-arrange things if needed.
   1863      *
   1864      *   region 0   --  virtio legacy io bar
   1865      *   region 1   --  msi-x bar
   1866      *   region 2   --  virtio modern io bar (off by default)
   1867      *   region 4+5 --  virtio modern memory (64bit) bar
   1868      *
   1869      */
   1870     proxy->legacy_io_bar_idx  = 0;
   1871     proxy->msix_bar_idx       = 1;
   1872     proxy->modern_io_bar_idx  = 2;
   1873     proxy->modern_mem_bar_idx = 4;
   1874 
   1875     proxy->common.offset = 0x0;
   1876     proxy->common.size = 0x1000;
   1877     proxy->common.type = VIRTIO_PCI_CAP_COMMON_CFG;
   1878 
   1879     proxy->isr.offset = 0x1000;
   1880     proxy->isr.size = 0x1000;
   1881     proxy->isr.type = VIRTIO_PCI_CAP_ISR_CFG;
   1882 
   1883     proxy->device.offset = 0x2000;
   1884     proxy->device.size = 0x1000;
   1885     proxy->device.type = VIRTIO_PCI_CAP_DEVICE_CFG;
   1886 
   1887     proxy->notify.offset = 0x3000;
   1888     proxy->notify.size = virtio_pci_queue_mem_mult(proxy) * VIRTIO_QUEUE_MAX;
   1889     proxy->notify.type = VIRTIO_PCI_CAP_NOTIFY_CFG;
   1890 
   1891     proxy->notify_pio.offset = 0x0;
   1892     proxy->notify_pio.size = 0x4;
   1893     proxy->notify_pio.type = VIRTIO_PCI_CAP_NOTIFY_CFG;
   1894 
   1895     /* subclasses can enforce modern, so do this unconditionally */
   1896     memory_region_init(&proxy->modern_bar, OBJECT(proxy), "virtio-pci",
   1897                        /* PCI BAR regions must be powers of 2 */
   1898                        pow2ceil(proxy->notify.offset + proxy->notify.size));
   1899 
   1900     if (proxy->disable_legacy == ON_OFF_AUTO_AUTO) {
   1901         proxy->disable_legacy = pcie_port ? ON_OFF_AUTO_ON : ON_OFF_AUTO_OFF;
   1902     }
   1903 
   1904     if (!virtio_pci_modern(proxy) && !virtio_pci_legacy(proxy)) {
   1905         error_setg(errp, "device cannot work as neither modern nor legacy mode"
   1906                    " is enabled");
   1907         error_append_hint(errp, "Set either disable-modern or disable-legacy"
   1908                           " to off\n");
   1909         return;
   1910     }
   1911 
   1912     if (pcie_port && pci_is_express(pci_dev)) {
   1913         int pos;
   1914         uint16_t last_pcie_cap_offset = PCI_CONFIG_SPACE_SIZE;
   1915 
   1916         pos = pcie_endpoint_cap_init(pci_dev, 0);
   1917         assert(pos > 0);
   1918 
   1919         pos = pci_add_capability(pci_dev, PCI_CAP_ID_PM, 0,
   1920                                  PCI_PM_SIZEOF, errp);
   1921         if (pos < 0) {
   1922             return;
   1923         }
   1924 
   1925         pci_dev->exp.pm_cap = pos;
   1926 
   1927         /*
   1928          * Indicates that this function complies with revision 1.2 of the
   1929          * PCI Power Management Interface Specification.
   1930          */
   1931         pci_set_word(pci_dev->config + pos + PCI_PM_PMC, 0x3);
   1932 
   1933         if (proxy->flags & VIRTIO_PCI_FLAG_AER) {
   1934             pcie_aer_init(pci_dev, PCI_ERR_VER, last_pcie_cap_offset,
   1935                           PCI_ERR_SIZEOF, NULL);
   1936             last_pcie_cap_offset += PCI_ERR_SIZEOF;
   1937         }
   1938 
   1939         if (proxy->flags & VIRTIO_PCI_FLAG_INIT_DEVERR) {
   1940             /* Init error enabling flags */
   1941             pcie_cap_deverr_init(pci_dev);
   1942         }
   1943 
   1944         if (proxy->flags & VIRTIO_PCI_FLAG_INIT_LNKCTL) {
   1945             /* Init Link Control Register */
   1946             pcie_cap_lnkctl_init(pci_dev);
   1947         }
   1948 
   1949         if (proxy->flags & VIRTIO_PCI_FLAG_INIT_PM) {
   1950             /* Init Power Management Control Register */
   1951             pci_set_word(pci_dev->wmask + pos + PCI_PM_CTRL,
   1952                          PCI_PM_CTRL_STATE_MASK);
   1953         }
   1954 
   1955         if (proxy->flags & VIRTIO_PCI_FLAG_ATS) {
   1956             pcie_ats_init(pci_dev, last_pcie_cap_offset,
   1957                           proxy->flags & VIRTIO_PCI_FLAG_ATS_PAGE_ALIGNED);
   1958             last_pcie_cap_offset += PCI_EXT_CAP_ATS_SIZEOF;
   1959         }
   1960 
   1961         if (proxy->flags & VIRTIO_PCI_FLAG_INIT_FLR) {
   1962             /* Set Function Level Reset capability bit */
   1963             pcie_cap_flr_init(pci_dev);
   1964         }
   1965     } else {
   1966         /*
   1967          * make future invocations of pci_is_express() return false
   1968          * and pci_config_size() return PCI_CONFIG_SPACE_SIZE.
   1969          */
   1970         pci_dev->cap_present &= ~QEMU_PCI_CAP_EXPRESS;
   1971     }
   1972 
   1973     virtio_pci_bus_new(&proxy->bus, sizeof(proxy->bus), proxy);
   1974     if (k->realize) {
   1975         k->realize(proxy, errp);
   1976     }
   1977 }
   1978 
   1979 static void virtio_pci_exit(PCIDevice *pci_dev)
   1980 {
   1981     VirtIOPCIProxy *proxy = VIRTIO_PCI(pci_dev);
   1982     bool pcie_port = pci_bus_is_express(pci_get_bus(pci_dev)) &&
   1983                      !pci_bus_is_root(pci_get_bus(pci_dev));
   1984 
   1985     msix_uninit_exclusive_bar(pci_dev);
   1986     if (proxy->flags & VIRTIO_PCI_FLAG_AER && pcie_port &&
   1987         pci_is_express(pci_dev)) {
   1988         pcie_aer_exit(pci_dev);
   1989     }
   1990 }
   1991 
   1992 static void virtio_pci_reset(DeviceState *qdev)
   1993 {
   1994     VirtIOPCIProxy *proxy = VIRTIO_PCI(qdev);
   1995     VirtioBusState *bus = VIRTIO_BUS(&proxy->bus);
   1996     int i;
   1997 
   1998     virtio_bus_reset(bus);
   1999     msix_unuse_all_vectors(&proxy->pci_dev);
   2000 
   2001     for (i = 0; i < VIRTIO_QUEUE_MAX; i++) {
   2002         proxy->vqs[i].enabled = 0;
   2003         proxy->vqs[i].reset = 0;
   2004         proxy->vqs[i].num = 0;
   2005         proxy->vqs[i].desc[0] = proxy->vqs[i].desc[1] = 0;
   2006         proxy->vqs[i].avail[0] = proxy->vqs[i].avail[1] = 0;
   2007         proxy->vqs[i].used[0] = proxy->vqs[i].used[1] = 0;
   2008     }
   2009 }
   2010 
   2011 static void virtio_pci_bus_reset(DeviceState *qdev)
   2012 {
   2013     PCIDevice *dev = PCI_DEVICE(qdev);
   2014 
   2015     virtio_pci_reset(qdev);
   2016 
   2017     if (pci_is_express(dev)) {
   2018         pcie_cap_deverr_reset(dev);
   2019         pcie_cap_lnkctl_reset(dev);
   2020 
   2021         pci_set_word(dev->config + dev->exp.pm_cap + PCI_PM_CTRL, 0);
   2022     }
   2023 }
   2024 
   2025 static Property virtio_pci_properties[] = {
   2026     DEFINE_PROP_BIT("virtio-pci-bus-master-bug-migration", VirtIOPCIProxy, flags,
   2027                     VIRTIO_PCI_FLAG_BUS_MASTER_BUG_MIGRATION_BIT, false),
   2028     DEFINE_PROP_BIT("migrate-extra", VirtIOPCIProxy, flags,
   2029                     VIRTIO_PCI_FLAG_MIGRATE_EXTRA_BIT, true),
   2030     DEFINE_PROP_BIT("modern-pio-notify", VirtIOPCIProxy, flags,
   2031                     VIRTIO_PCI_FLAG_MODERN_PIO_NOTIFY_BIT, false),
   2032     DEFINE_PROP_BIT("x-disable-pcie", VirtIOPCIProxy, flags,
   2033                     VIRTIO_PCI_FLAG_DISABLE_PCIE_BIT, false),
   2034     DEFINE_PROP_BIT("page-per-vq", VirtIOPCIProxy, flags,
   2035                     VIRTIO_PCI_FLAG_PAGE_PER_VQ_BIT, false),
   2036     DEFINE_PROP_BOOL("x-ignore-backend-features", VirtIOPCIProxy,
   2037                      ignore_backend_features, false),
   2038     DEFINE_PROP_BIT("ats", VirtIOPCIProxy, flags,
   2039                     VIRTIO_PCI_FLAG_ATS_BIT, false),
   2040     DEFINE_PROP_BIT("x-ats-page-aligned", VirtIOPCIProxy, flags,
   2041                     VIRTIO_PCI_FLAG_ATS_PAGE_ALIGNED_BIT, true),
   2042     DEFINE_PROP_BIT("x-pcie-deverr-init", VirtIOPCIProxy, flags,
   2043                     VIRTIO_PCI_FLAG_INIT_DEVERR_BIT, true),
   2044     DEFINE_PROP_BIT("x-pcie-lnkctl-init", VirtIOPCIProxy, flags,
   2045                     VIRTIO_PCI_FLAG_INIT_LNKCTL_BIT, true),
   2046     DEFINE_PROP_BIT("x-pcie-pm-init", VirtIOPCIProxy, flags,
   2047                     VIRTIO_PCI_FLAG_INIT_PM_BIT, true),
   2048     DEFINE_PROP_BIT("x-pcie-flr-init", VirtIOPCIProxy, flags,
   2049                     VIRTIO_PCI_FLAG_INIT_FLR_BIT, true),
   2050     DEFINE_PROP_BIT("aer", VirtIOPCIProxy, flags,
   2051                     VIRTIO_PCI_FLAG_AER_BIT, false),
   2052     DEFINE_PROP_END_OF_LIST(),
   2053 };
   2054 
   2055 static void virtio_pci_dc_realize(DeviceState *qdev, Error **errp)
   2056 {
   2057     VirtioPCIClass *vpciklass = VIRTIO_PCI_GET_CLASS(qdev);
   2058     VirtIOPCIProxy *proxy = VIRTIO_PCI(qdev);
   2059     PCIDevice *pci_dev = &proxy->pci_dev;
   2060 
   2061     if (!(proxy->flags & VIRTIO_PCI_FLAG_DISABLE_PCIE) &&
   2062         virtio_pci_modern(proxy)) {
   2063         pci_dev->cap_present |= QEMU_PCI_CAP_EXPRESS;
   2064     }
   2065 
   2066     vpciklass->parent_dc_realize(qdev, errp);
   2067 }
   2068 
   2069 static void virtio_pci_class_init(ObjectClass *klass, void *data)
   2070 {
   2071     DeviceClass *dc = DEVICE_CLASS(klass);
   2072     PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
   2073     VirtioPCIClass *vpciklass = VIRTIO_PCI_CLASS(klass);
   2074 
   2075     device_class_set_props(dc, virtio_pci_properties);
   2076     k->realize = virtio_pci_realize;
   2077     k->exit = virtio_pci_exit;
   2078     k->vendor_id = PCI_VENDOR_ID_REDHAT_QUMRANET;
   2079     k->revision = VIRTIO_PCI_ABI_VERSION;
   2080     k->class_id = PCI_CLASS_OTHERS;
   2081     device_class_set_parent_realize(dc, virtio_pci_dc_realize,
   2082                                     &vpciklass->parent_dc_realize);
   2083     dc->reset = virtio_pci_bus_reset;
   2084 }
   2085 
   2086 static const TypeInfo virtio_pci_info = {
   2087     .name          = TYPE_VIRTIO_PCI,
   2088     .parent        = TYPE_PCI_DEVICE,
   2089     .instance_size = sizeof(VirtIOPCIProxy),
   2090     .class_init    = virtio_pci_class_init,
   2091     .class_size    = sizeof(VirtioPCIClass),
   2092     .abstract      = true,
   2093 };
   2094 
   2095 static Property virtio_pci_generic_properties[] = {
   2096     DEFINE_PROP_ON_OFF_AUTO("disable-legacy", VirtIOPCIProxy, disable_legacy,
   2097                             ON_OFF_AUTO_AUTO),
   2098     DEFINE_PROP_BOOL("disable-modern", VirtIOPCIProxy, disable_modern, false),
   2099     DEFINE_PROP_END_OF_LIST(),
   2100 };
   2101 
   2102 static void virtio_pci_base_class_init(ObjectClass *klass, void *data)
   2103 {
   2104     const VirtioPCIDeviceTypeInfo *t = data;
   2105     if (t->class_init) {
   2106         t->class_init(klass, NULL);
   2107     }
   2108 }
   2109 
   2110 static void virtio_pci_generic_class_init(ObjectClass *klass, void *data)
   2111 {
   2112     DeviceClass *dc = DEVICE_CLASS(klass);
   2113 
   2114     device_class_set_props(dc, virtio_pci_generic_properties);
   2115 }
   2116 
   2117 static void virtio_pci_transitional_instance_init(Object *obj)
   2118 {
   2119     VirtIOPCIProxy *proxy = VIRTIO_PCI(obj);
   2120 
   2121     proxy->disable_legacy = ON_OFF_AUTO_OFF;
   2122     proxy->disable_modern = false;
   2123 }
   2124 
   2125 static void virtio_pci_non_transitional_instance_init(Object *obj)
   2126 {
   2127     VirtIOPCIProxy *proxy = VIRTIO_PCI(obj);
   2128 
   2129     proxy->disable_legacy = ON_OFF_AUTO_ON;
   2130     proxy->disable_modern = false;
   2131 }
   2132 
   2133 void virtio_pci_types_register(const VirtioPCIDeviceTypeInfo *t)
   2134 {
   2135     char *base_name = NULL;
   2136     TypeInfo base_type_info = {
   2137         .name          = t->base_name,
   2138         .parent        = t->parent ? t->parent : TYPE_VIRTIO_PCI,
   2139         .instance_size = t->instance_size,
   2140         .instance_init = t->instance_init,
   2141         .class_size    = t->class_size,
   2142         .abstract      = true,
   2143         .interfaces    = t->interfaces,
   2144     };
   2145     TypeInfo generic_type_info = {
   2146         .name = t->generic_name,
   2147         .parent = base_type_info.name,
   2148         .class_init = virtio_pci_generic_class_init,
   2149         .interfaces = (InterfaceInfo[]) {
   2150             { INTERFACE_PCIE_DEVICE },
   2151             { INTERFACE_CONVENTIONAL_PCI_DEVICE },
   2152             { }
   2153         },
   2154     };
   2155 
   2156     if (!base_type_info.name) {
   2157         /* No base type -> register a single generic device type */
   2158         /* use intermediate %s-base-type to add generic device props */
   2159         base_name = g_strdup_printf("%s-base-type", t->generic_name);
   2160         base_type_info.name = base_name;
   2161         base_type_info.class_init = virtio_pci_generic_class_init;
   2162 
   2163         generic_type_info.parent = base_name;
   2164         generic_type_info.class_init = virtio_pci_base_class_init;
   2165         generic_type_info.class_data = (void *)t;
   2166 
   2167         assert(!t->non_transitional_name);
   2168         assert(!t->transitional_name);
   2169     } else {
   2170         base_type_info.class_init = virtio_pci_base_class_init;
   2171         base_type_info.class_data = (void *)t;
   2172     }
   2173 
   2174     type_register(&base_type_info);
   2175     if (generic_type_info.name) {
   2176         type_register(&generic_type_info);
   2177     }
   2178 
   2179     if (t->non_transitional_name) {
   2180         const TypeInfo non_transitional_type_info = {
   2181             .name          = t->non_transitional_name,
   2182             .parent        = base_type_info.name,
   2183             .instance_init = virtio_pci_non_transitional_instance_init,
   2184             .interfaces = (InterfaceInfo[]) {
   2185                 { INTERFACE_PCIE_DEVICE },
   2186                 { INTERFACE_CONVENTIONAL_PCI_DEVICE },
   2187                 { }
   2188             },
   2189         };
   2190         type_register(&non_transitional_type_info);
   2191     }
   2192 
   2193     if (t->transitional_name) {
   2194         const TypeInfo transitional_type_info = {
   2195             .name          = t->transitional_name,
   2196             .parent        = base_type_info.name,
   2197             .instance_init = virtio_pci_transitional_instance_init,
   2198             .interfaces = (InterfaceInfo[]) {
   2199                 /*
   2200                  * Transitional virtio devices work only as Conventional PCI
   2201                  * devices because they require PIO ports.
   2202                  */
   2203                 { INTERFACE_CONVENTIONAL_PCI_DEVICE },
   2204                 { }
   2205             },
   2206         };
   2207         type_register(&transitional_type_info);
   2208     }
   2209     g_free(base_name);
   2210 }
   2211 
   2212 unsigned virtio_pci_optimal_num_queues(unsigned fixed_queues)
   2213 {
   2214     /*
   2215      * 1:1 vq to vCPU mapping is ideal because the same vCPU that submitted
   2216      * virtqueue buffers can handle their completion. When a different vCPU
   2217      * handles completion it may need to IPI the vCPU that submitted the
   2218      * request and this adds overhead.
   2219      *
   2220      * Virtqueues consume guest RAM and MSI-X vectors. This is wasteful in
   2221      * guests with very many vCPUs and a device that is only used by a few
   2222      * vCPUs. Unfortunately optimizing that case requires manual pinning inside
   2223      * the guest, so those users might as well manually set the number of
   2224      * queues. There is no upper limit that can be applied automatically and
   2225      * doing so arbitrarily would result in a sudden performance drop once the
   2226      * threshold number of vCPUs is exceeded.
   2227      */
   2228     unsigned num_queues = current_machine->smp.cpus;
   2229 
   2230     /*
   2231      * The maximum number of MSI-X vectors is PCI_MSIX_FLAGS_QSIZE + 1, but the
   2232      * config change interrupt and the fixed virtqueues must be taken into
   2233      * account too.
   2234      */
   2235     num_queues = MIN(num_queues, PCI_MSIX_FLAGS_QSIZE - fixed_queues);
   2236 
   2237     /*
   2238      * There is a limit to how many virtqueues a device can have.
   2239      */
   2240     return MIN(num_queues, VIRTIO_QUEUE_MAX - fixed_queues);
   2241 }
   2242 
   2243 /* virtio-pci-bus */
   2244 
   2245 static void virtio_pci_bus_new(VirtioBusState *bus, size_t bus_size,
   2246                                VirtIOPCIProxy *dev)
   2247 {
   2248     DeviceState *qdev = DEVICE(dev);
   2249     char virtio_bus_name[] = "virtio-bus";
   2250 
   2251     qbus_init(bus, bus_size, TYPE_VIRTIO_PCI_BUS, qdev, virtio_bus_name);
   2252 }
   2253 
   2254 static void virtio_pci_bus_class_init(ObjectClass *klass, void *data)
   2255 {
   2256     BusClass *bus_class = BUS_CLASS(klass);
   2257     VirtioBusClass *k = VIRTIO_BUS_CLASS(klass);
   2258     bus_class->max_dev = 1;
   2259     k->notify = virtio_pci_notify;
   2260     k->save_config = virtio_pci_save_config;
   2261     k->load_config = virtio_pci_load_config;
   2262     k->save_queue = virtio_pci_save_queue;
   2263     k->load_queue = virtio_pci_load_queue;
   2264     k->save_extra_state = virtio_pci_save_extra_state;
   2265     k->load_extra_state = virtio_pci_load_extra_state;
   2266     k->has_extra_state = virtio_pci_has_extra_state;
   2267     k->query_guest_notifiers = virtio_pci_query_guest_notifiers;
   2268     k->set_guest_notifiers = virtio_pci_set_guest_notifiers;
   2269     k->set_host_notifier_mr = virtio_pci_set_host_notifier_mr;
   2270     k->vmstate_change = virtio_pci_vmstate_change;
   2271     k->pre_plugged = virtio_pci_pre_plugged;
   2272     k->device_plugged = virtio_pci_device_plugged;
   2273     k->device_unplugged = virtio_pci_device_unplugged;
   2274     k->query_nvectors = virtio_pci_query_nvectors;
   2275     k->ioeventfd_enabled = virtio_pci_ioeventfd_enabled;
   2276     k->ioeventfd_assign = virtio_pci_ioeventfd_assign;
   2277     k->get_dma_as = virtio_pci_get_dma_as;
   2278     k->iommu_enabled = virtio_pci_iommu_enabled;
   2279     k->queue_enabled = virtio_pci_queue_enabled;
   2280 }
   2281 
   2282 static const TypeInfo virtio_pci_bus_info = {
   2283     .name          = TYPE_VIRTIO_PCI_BUS,
   2284     .parent        = TYPE_VIRTIO_BUS,
   2285     .instance_size = sizeof(VirtioPCIBusState),
   2286     .class_size    = sizeof(VirtioPCIBusClass),
   2287     .class_init    = virtio_pci_bus_class_init,
   2288 };
   2289 
   2290 static void virtio_pci_register_types(void)
   2291 {
   2292     /* Base types: */
   2293     type_register_static(&virtio_pci_bus_info);
   2294     type_register_static(&virtio_pci_info);
   2295 }
   2296 
   2297 type_init(virtio_pci_register_types)
   2298
	qemu FORK: QEMU emulator
	git clone https://git.neptards.moe/neptards/qemu.git
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