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qemu/hw/virtio/virtio-mmio.c
Sergio Lopez 44e687a4d9 virtio-mmio: implement modern (v2) personality (virtio-1) 
Implement the modern (v2) personality, according to the VirtIO 1.0
specification.

Support for v2 among guests is not as widespread as it'd be
desirable. While the Linux driver has had it for a while, support is
missing, at least, from Tianocore EDK II, NetBSD and FreeBSD.

For this reason, the v2 personality is disabled, keeping the legacy
behavior as default. Machine types willing to use v2, can enable it
using MachineClass's compat_props.

Signed-off-by: Sergio Lopez <slp@redhat.com>
Message-Id: <20190913120559.40835-1-slp@redhat.com>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
2019-09-16 11:17:06 -04:00

832 lines
26 KiB
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/*
* Virtio MMIO bindings
*
* Copyright (c) 2011 Linaro Limited
*
* Author:
* Peter Maydell <peter.maydell@linaro.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, see <http://www.gnu.org/licenses/>.
*/
#include "qemu/osdep.h"
#include "standard-headers/linux/virtio_mmio.h"
#include "hw/irq.h"
#include "hw/qdev-properties.h"
#include "hw/sysbus.h"
#include "hw/virtio/virtio.h"
#include "migration/qemu-file-types.h"
#include "qemu/host-utils.h"
#include "qemu/module.h"
#include "sysemu/kvm.h"
#include "hw/virtio/virtio-bus.h"
#include "qemu/error-report.h"
#include "qemu/log.h"
#include "trace.h"
/* QOM macros */
/* virtio-mmio-bus */
#define TYPE_VIRTIO_MMIO_BUS "virtio-mmio-bus"
#define VIRTIO_MMIO_BUS(obj) \
OBJECT_CHECK(VirtioBusState, (obj), TYPE_VIRTIO_MMIO_BUS)
#define VIRTIO_MMIO_BUS_GET_CLASS(obj) \
OBJECT_GET_CLASS(VirtioBusClass, (obj), TYPE_VIRTIO_MMIO_BUS)
#define VIRTIO_MMIO_BUS_CLASS(klass) \
OBJECT_CLASS_CHECK(VirtioBusClass, (klass), TYPE_VIRTIO_MMIO_BUS)
/* virtio-mmio */
#define TYPE_VIRTIO_MMIO "virtio-mmio"
#define VIRTIO_MMIO(obj) \
OBJECT_CHECK(VirtIOMMIOProxy, (obj), TYPE_VIRTIO_MMIO)
#define VIRT_MAGIC 0x74726976 /* 'virt' */
#define VIRT_VERSION 2
#define VIRT_VERSION_LEGACY 1
#define VIRT_VENDOR 0x554D4551 /* 'QEMU' */
typedef struct VirtIOMMIOQueue {
uint16_t num;
bool enabled;
uint32_t desc[2];
uint32_t avail[2];
uint32_t used[2];
} VirtIOMMIOQueue;
typedef struct {
/* Generic */
SysBusDevice parent_obj;
MemoryRegion iomem;
qemu_irq irq;
bool legacy;
/* Guest accessible state needing migration and reset */
uint32_t host_features_sel;
uint32_t guest_features_sel;
uint32_t guest_page_shift;
/* virtio-bus */
VirtioBusState bus;
bool format_transport_address;
/* Fields only used for non-legacy (v2) devices */
uint32_t guest_features[2];
VirtIOMMIOQueue vqs[VIRTIO_QUEUE_MAX];
} VirtIOMMIOProxy;
static bool virtio_mmio_ioeventfd_enabled(DeviceState *d)
{
return kvm_eventfds_enabled();
}
static int virtio_mmio_ioeventfd_assign(DeviceState *d,
EventNotifier *notifier,
int n, bool assign)
{
VirtIOMMIOProxy *proxy = VIRTIO_MMIO(d);
if (assign) {
memory_region_add_eventfd(&proxy->iomem, VIRTIO_MMIO_QUEUE_NOTIFY, 4,
true, n, notifier);
} else {
memory_region_del_eventfd(&proxy->iomem, VIRTIO_MMIO_QUEUE_NOTIFY, 4,
true, n, notifier);
}
return 0;
}
static void virtio_mmio_start_ioeventfd(VirtIOMMIOProxy *proxy)
{
virtio_bus_start_ioeventfd(&proxy->bus);
}
static void virtio_mmio_stop_ioeventfd(VirtIOMMIOProxy *proxy)
{
virtio_bus_stop_ioeventfd(&proxy->bus);
}
static uint64_t virtio_mmio_read(void *opaque, hwaddr offset, unsigned size)
{
VirtIOMMIOProxy *proxy = (VirtIOMMIOProxy *)opaque;
VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
trace_virtio_mmio_read(offset);
if (!vdev) {
/* If no backend is present, we treat most registers as
* read-as-zero, except for the magic number, version and
* vendor ID. This is not strictly sanctioned by the virtio
* spec, but it allows us to provide transports with no backend
* plugged in which don't confuse Linux's virtio code: the
* probe won't complain about the bad magic number, but the
* device ID of zero means no backend will claim it.
*/
switch (offset) {
case VIRTIO_MMIO_MAGIC_VALUE:
return VIRT_MAGIC;
case VIRTIO_MMIO_VERSION:
if (proxy->legacy) {
return VIRT_VERSION_LEGACY;
} else {
return VIRT_VERSION;
}
case VIRTIO_MMIO_VENDOR_ID:
return VIRT_VENDOR;
default:
return 0;
}
}
if (offset >= VIRTIO_MMIO_CONFIG) {
offset -= VIRTIO_MMIO_CONFIG;
switch (size) {
case 1:
return virtio_config_readb(vdev, offset);
case 2:
return virtio_config_readw(vdev, offset);
case 4:
return virtio_config_readl(vdev, offset);
default:
abort();
}
}
if (size != 4) {
qemu_log_mask(LOG_GUEST_ERROR,
"%s: wrong size access to register!\n",
__func__);
return 0;
}
switch (offset) {
case VIRTIO_MMIO_MAGIC_VALUE:
return VIRT_MAGIC;
case VIRTIO_MMIO_VERSION:
if (proxy->legacy) {
return VIRT_VERSION_LEGACY;
} else {
return VIRT_VERSION;
}
case VIRTIO_MMIO_DEVICE_ID:
return vdev->device_id;
case VIRTIO_MMIO_VENDOR_ID:
return VIRT_VENDOR;
case VIRTIO_MMIO_DEVICE_FEATURES:
if (proxy->legacy) {
if (proxy->host_features_sel) {
return 0;
} else {
return vdev->host_features;
}
} else {
VirtioDeviceClass *vdc = VIRTIO_DEVICE_GET_CLASS(vdev);
return (vdev->host_features & ~vdc->legacy_features)
>> (32 * proxy->host_features_sel);
}
case VIRTIO_MMIO_QUEUE_NUM_MAX:
if (!virtio_queue_get_num(vdev, vdev->queue_sel)) {
return 0;
}
return VIRTQUEUE_MAX_SIZE;
case VIRTIO_MMIO_QUEUE_PFN:
if (!proxy->legacy) {
qemu_log_mask(LOG_GUEST_ERROR,
"%s: read from legacy register (0x%"
HWADDR_PRIx ") in non-legacy mode\n",
__func__, offset);
return 0;
}
return virtio_queue_get_addr(vdev, vdev->queue_sel)
>> proxy->guest_page_shift;
case VIRTIO_MMIO_QUEUE_READY:
if (proxy->legacy) {
qemu_log_mask(LOG_GUEST_ERROR,
"%s: read from non-legacy register (0x%"
HWADDR_PRIx ") in legacy mode\n",
__func__, offset);
return 0;
}
return proxy->vqs[vdev->queue_sel].enabled;
case VIRTIO_MMIO_INTERRUPT_STATUS:
return atomic_read(&vdev->isr);
case VIRTIO_MMIO_STATUS:
return vdev->status;
case VIRTIO_MMIO_CONFIG_GENERATION:
if (proxy->legacy) {
qemu_log_mask(LOG_GUEST_ERROR,
"%s: read from non-legacy register (0x%"
HWADDR_PRIx ") in legacy mode\n",
__func__, offset);
return 0;
}
return vdev->generation;
case VIRTIO_MMIO_DEVICE_FEATURES_SEL:
case VIRTIO_MMIO_DRIVER_FEATURES:
case VIRTIO_MMIO_DRIVER_FEATURES_SEL:
case VIRTIO_MMIO_GUEST_PAGE_SIZE:
case VIRTIO_MMIO_QUEUE_SEL:
case VIRTIO_MMIO_QUEUE_NUM:
case VIRTIO_MMIO_QUEUE_ALIGN:
case VIRTIO_MMIO_QUEUE_NOTIFY:
case VIRTIO_MMIO_INTERRUPT_ACK:
case VIRTIO_MMIO_QUEUE_DESC_LOW:
case VIRTIO_MMIO_QUEUE_DESC_HIGH:
case VIRTIO_MMIO_QUEUE_AVAIL_LOW:
case VIRTIO_MMIO_QUEUE_AVAIL_HIGH:
case VIRTIO_MMIO_QUEUE_USED_LOW:
case VIRTIO_MMIO_QUEUE_USED_HIGH:
qemu_log_mask(LOG_GUEST_ERROR,
"%s: read of write-only register (0x%" HWADDR_PRIx ")\n",
__func__, offset);
return 0;
default:
qemu_log_mask(LOG_GUEST_ERROR,
"%s: bad register offset (0x%" HWADDR_PRIx ")\n",
__func__, offset);
return 0;
}
return 0;
}
static void virtio_mmio_write(void *opaque, hwaddr offset, uint64_t value,
unsigned size)
{
VirtIOMMIOProxy *proxy = (VirtIOMMIOProxy *)opaque;
VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
trace_virtio_mmio_write_offset(offset, value);
if (!vdev) {
/* If no backend is present, we just make all registers
* write-ignored. This allows us to provide transports with
* no backend plugged in.
*/
return;
}
if (offset >= VIRTIO_MMIO_CONFIG) {
offset -= VIRTIO_MMIO_CONFIG;
switch (size) {
case 1:
virtio_config_writeb(vdev, offset, value);
break;
case 2:
virtio_config_writew(vdev, offset, value);
break;
case 4:
virtio_config_writel(vdev, offset, value);
break;
default:
abort();
}
return;
}
if (size != 4) {
qemu_log_mask(LOG_GUEST_ERROR,
"%s: wrong size access to register!\n",
__func__);
return;
}
switch (offset) {
case VIRTIO_MMIO_DEVICE_FEATURES_SEL:
if (value) {
proxy->host_features_sel = 1;
} else {
proxy->host_features_sel = 0;
}
break;
case VIRTIO_MMIO_DRIVER_FEATURES:
if (proxy->legacy) {
if (proxy->guest_features_sel) {
qemu_log_mask(LOG_GUEST_ERROR,
"%s: attempt to write guest features with "
"guest_features_sel > 0 in legacy mode\n",
__func__);
} else {
virtio_set_features(vdev, value);
}
} else {
proxy->guest_features[proxy->guest_features_sel] = value;
}
break;
case VIRTIO_MMIO_DRIVER_FEATURES_SEL:
if (value) {
proxy->guest_features_sel = 1;
} else {
proxy->guest_features_sel = 0;
}
break;
case VIRTIO_MMIO_GUEST_PAGE_SIZE:
if (!proxy->legacy) {
qemu_log_mask(LOG_GUEST_ERROR,
"%s: write to legacy register (0x%"
HWADDR_PRIx ") in non-legacy mode\n",
__func__, offset);
return;
}
proxy->guest_page_shift = ctz32(value);
if (proxy->guest_page_shift > 31) {
proxy->guest_page_shift = 0;
}
trace_virtio_mmio_guest_page(value, proxy->guest_page_shift);
break;
case VIRTIO_MMIO_QUEUE_SEL:
if (value < VIRTIO_QUEUE_MAX) {
vdev->queue_sel = value;
}
break;
case VIRTIO_MMIO_QUEUE_NUM:
trace_virtio_mmio_queue_write(value, VIRTQUEUE_MAX_SIZE);
if (proxy->legacy) {
virtio_queue_set_num(vdev, vdev->queue_sel, value);
virtio_queue_update_rings(vdev, vdev->queue_sel);
} else {
proxy->vqs[vdev->queue_sel].num = value;
}
break;
case VIRTIO_MMIO_QUEUE_ALIGN:
if (!proxy->legacy) {
qemu_log_mask(LOG_GUEST_ERROR,
"%s: write to legacy register (0x%"
HWADDR_PRIx ") in non-legacy mode\n",
__func__, offset);
return;
}
virtio_queue_set_align(vdev, vdev->queue_sel, value);
break;
case VIRTIO_MMIO_QUEUE_PFN:
if (!proxy->legacy) {
qemu_log_mask(LOG_GUEST_ERROR,
"%s: write to legacy register (0x%"
HWADDR_PRIx ") in non-legacy mode\n",
__func__, offset);
return;
}
if (value == 0) {
virtio_reset(vdev);
} else {
virtio_queue_set_addr(vdev, vdev->queue_sel,
value << proxy->guest_page_shift);
}
break;
case VIRTIO_MMIO_QUEUE_READY:
if (proxy->legacy) {
qemu_log_mask(LOG_GUEST_ERROR,
"%s: write to non-legacy register (0x%"
HWADDR_PRIx ") in legacy mode\n",
__func__, offset);
return;
}
if (value) {
virtio_queue_set_num(vdev, vdev->queue_sel,
proxy->vqs[vdev->queue_sel].num);
virtio_queue_set_rings(vdev, vdev->queue_sel,
((uint64_t)proxy->vqs[vdev->queue_sel].desc[1]) << 32 |
proxy->vqs[vdev->queue_sel].desc[0],
((uint64_t)proxy->vqs[vdev->queue_sel].avail[1]) << 32 |
proxy->vqs[vdev->queue_sel].avail[0],
((uint64_t)proxy->vqs[vdev->queue_sel].used[1]) << 32 |
proxy->vqs[vdev->queue_sel].used[0]);
proxy->vqs[vdev->queue_sel].enabled = 1;
} else {
proxy->vqs[vdev->queue_sel].enabled = 0;
}
break;
case VIRTIO_MMIO_QUEUE_NOTIFY:
if (value < VIRTIO_QUEUE_MAX) {
virtio_queue_notify(vdev, value);
}
break;
case VIRTIO_MMIO_INTERRUPT_ACK:
atomic_and(&vdev->isr, ~value);
virtio_update_irq(vdev);
break;
case VIRTIO_MMIO_STATUS:
if (!(value & VIRTIO_CONFIG_S_DRIVER_OK)) {
virtio_mmio_stop_ioeventfd(proxy);
}
if (!proxy->legacy && (value & VIRTIO_CONFIG_S_FEATURES_OK)) {
virtio_set_features(vdev,
((uint64_t)proxy->guest_features[1]) << 32 |
proxy->guest_features[0]);
}
virtio_set_status(vdev, value & 0xff);
if (value & VIRTIO_CONFIG_S_DRIVER_OK) {
virtio_mmio_start_ioeventfd(proxy);
}
if (vdev->status == 0) {
virtio_reset(vdev);
}
break;
case VIRTIO_MMIO_QUEUE_DESC_LOW:
if (proxy->legacy) {
qemu_log_mask(LOG_GUEST_ERROR,
"%s: write to non-legacy register (0x%"
HWADDR_PRIx ") in legacy mode\n",
__func__, offset);
return;
}
proxy->vqs[vdev->queue_sel].desc[0] = value;
break;
case VIRTIO_MMIO_QUEUE_DESC_HIGH:
if (proxy->legacy) {
qemu_log_mask(LOG_GUEST_ERROR,
"%s: write to non-legacy register (0x%"
HWADDR_PRIx ") in legacy mode\n",
__func__, offset);
return;
}
proxy->vqs[vdev->queue_sel].desc[1] = value;
break;
case VIRTIO_MMIO_QUEUE_AVAIL_LOW:
if (proxy->legacy) {
qemu_log_mask(LOG_GUEST_ERROR,
"%s: write to non-legacy register (0x%"
HWADDR_PRIx ") in legacy mode\n",
__func__, offset);
return;
}
proxy->vqs[vdev->queue_sel].avail[0] = value;
break;
case VIRTIO_MMIO_QUEUE_AVAIL_HIGH:
if (proxy->legacy) {
qemu_log_mask(LOG_GUEST_ERROR,
"%s: write to non-legacy register (0x%"
HWADDR_PRIx ") in legacy mode\n",
__func__, offset);
return;
}
proxy->vqs[vdev->queue_sel].avail[1] = value;
break;
case VIRTIO_MMIO_QUEUE_USED_LOW:
if (proxy->legacy) {
qemu_log_mask(LOG_GUEST_ERROR,
"%s: write to non-legacy register (0x%"
HWADDR_PRIx ") in legacy mode\n",
__func__, offset);
return;
}
proxy->vqs[vdev->queue_sel].used[0] = value;
break;
case VIRTIO_MMIO_QUEUE_USED_HIGH:
if (proxy->legacy) {
qemu_log_mask(LOG_GUEST_ERROR,
"%s: write to non-legacy register (0x%"
HWADDR_PRIx ") in legacy mode\n",
__func__, offset);
return;
}
proxy->vqs[vdev->queue_sel].used[1] = value;
break;
case VIRTIO_MMIO_MAGIC_VALUE:
case VIRTIO_MMIO_VERSION:
case VIRTIO_MMIO_DEVICE_ID:
case VIRTIO_MMIO_VENDOR_ID:
case VIRTIO_MMIO_DEVICE_FEATURES:
case VIRTIO_MMIO_QUEUE_NUM_MAX:
case VIRTIO_MMIO_INTERRUPT_STATUS:
case VIRTIO_MMIO_CONFIG_GENERATION:
qemu_log_mask(LOG_GUEST_ERROR,
"%s: write to read-only register (0x%" HWADDR_PRIx ")\n",
__func__, offset);
break;
default:
qemu_log_mask(LOG_GUEST_ERROR,
"%s: bad register offset (0x%" HWADDR_PRIx ")\n",
__func__, offset);
}
}
static const MemoryRegionOps virtio_legacy_mem_ops = {
.read = virtio_mmio_read,
.write = virtio_mmio_write,
.endianness = DEVICE_NATIVE_ENDIAN,
};
static const MemoryRegionOps virtio_mem_ops = {
.read = virtio_mmio_read,
.write = virtio_mmio_write,
.endianness = DEVICE_LITTLE_ENDIAN,
};
static void virtio_mmio_update_irq(DeviceState *opaque, uint16_t vector)
{
VirtIOMMIOProxy *proxy = VIRTIO_MMIO(opaque);
VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
int level;
if (!vdev) {
return;
}
level = (atomic_read(&vdev->isr) != 0);
trace_virtio_mmio_setting_irq(level);
qemu_set_irq(proxy->irq, level);
}
static int virtio_mmio_load_config(DeviceState *opaque, QEMUFile *f)
{
VirtIOMMIOProxy *proxy = VIRTIO_MMIO(opaque);
proxy->host_features_sel = qemu_get_be32(f);
proxy->guest_features_sel = qemu_get_be32(f);
proxy->guest_page_shift = qemu_get_be32(f);
return 0;
}
static void virtio_mmio_save_config(DeviceState *opaque, QEMUFile *f)
{
VirtIOMMIOProxy *proxy = VIRTIO_MMIO(opaque);
qemu_put_be32(f, proxy->host_features_sel);
qemu_put_be32(f, proxy->guest_features_sel);
qemu_put_be32(f, proxy->guest_page_shift);
}
static const VMStateDescription vmstate_virtio_mmio_queue_state = {
.name = "virtio_mmio/queue_state",
.version_id = 1,
.minimum_version_id = 1,
.fields = (VMStateField[]) {
VMSTATE_UINT16(num, VirtIOMMIOQueue),
VMSTATE_BOOL(enabled, VirtIOMMIOQueue),
VMSTATE_UINT32_ARRAY(desc, VirtIOMMIOQueue, 2),
VMSTATE_UINT32_ARRAY(avail, VirtIOMMIOQueue, 2),
VMSTATE_UINT32_ARRAY(used, VirtIOMMIOQueue, 2),
VMSTATE_END_OF_LIST()
}
};
static const VMStateDescription vmstate_virtio_mmio_state_sub = {
.name = "virtio_mmio/state",
.version_id = 1,
.minimum_version_id = 1,
.fields = (VMStateField[]) {
VMSTATE_UINT32_ARRAY(guest_features, VirtIOMMIOProxy, 2),
VMSTATE_STRUCT_ARRAY(vqs, VirtIOMMIOProxy, VIRTIO_QUEUE_MAX, 0,
vmstate_virtio_mmio_queue_state,
VirtIOMMIOQueue),
VMSTATE_END_OF_LIST()
}
};
static const VMStateDescription vmstate_virtio_mmio = {
.name = "virtio_mmio",
.version_id = 1,
.minimum_version_id = 1,
.minimum_version_id_old = 1,
.fields = (VMStateField[]) {
VMSTATE_END_OF_LIST()
},
.subsections = (const VMStateDescription * []) {
&vmstate_virtio_mmio_state_sub,
NULL
}
};
static void virtio_mmio_save_extra_state(DeviceState *opaque, QEMUFile *f)
{
VirtIOMMIOProxy *proxy = VIRTIO_MMIO(opaque);
vmstate_save_state(f, &vmstate_virtio_mmio, proxy, NULL);
}
static int virtio_mmio_load_extra_state(DeviceState *opaque, QEMUFile *f)
{
VirtIOMMIOProxy *proxy = VIRTIO_MMIO(opaque);
return vmstate_load_state(f, &vmstate_virtio_mmio, proxy, 1);
}
static bool virtio_mmio_has_extra_state(DeviceState *opaque)
{
VirtIOMMIOProxy *proxy = VIRTIO_MMIO(opaque);
return !proxy->legacy;
}
static void virtio_mmio_reset(DeviceState *d)
{
VirtIOMMIOProxy *proxy = VIRTIO_MMIO(d);
int i;
virtio_mmio_stop_ioeventfd(proxy);
virtio_bus_reset(&proxy->bus);
proxy->host_features_sel = 0;
proxy->guest_features_sel = 0;
proxy->guest_page_shift = 0;
if (!proxy->legacy) {
proxy->guest_features[0] = proxy->guest_features[1] = 0;
for (i = 0; i < VIRTIO_QUEUE_MAX; i++) {
proxy->vqs[i].enabled = 0;
proxy->vqs[i].num = 0;
proxy->vqs[i].desc[0] = proxy->vqs[i].desc[1] = 0;
proxy->vqs[i].avail[0] = proxy->vqs[i].avail[1] = 0;
proxy->vqs[i].used[0] = proxy->vqs[i].used[1] = 0;
}
}
}
static int virtio_mmio_set_guest_notifier(DeviceState *d, int n, bool assign,
bool with_irqfd)
{
VirtIOMMIOProxy *proxy = VIRTIO_MMIO(d);
VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
VirtioDeviceClass *vdc = VIRTIO_DEVICE_GET_CLASS(vdev);
VirtQueue *vq = virtio_get_queue(vdev, n);
EventNotifier *notifier = virtio_queue_get_guest_notifier(vq);
if (assign) {
int r = event_notifier_init(notifier, 0);
if (r < 0) {
return r;
}
virtio_queue_set_guest_notifier_fd_handler(vq, true, with_irqfd);
} else {
virtio_queue_set_guest_notifier_fd_handler(vq, false, with_irqfd);
event_notifier_cleanup(notifier);
}
if (vdc->guest_notifier_mask && vdev->use_guest_notifier_mask) {
vdc->guest_notifier_mask(vdev, n, !assign);
}
return 0;
}
static int virtio_mmio_set_guest_notifiers(DeviceState *d, int nvqs,
bool assign)
{
VirtIOMMIOProxy *proxy = VIRTIO_MMIO(d);
VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
/* TODO: need to check if kvm-arm supports irqfd */
bool with_irqfd = false;
int r, n;
nvqs = MIN(nvqs, VIRTIO_QUEUE_MAX);
for (n = 0; n < nvqs; n++) {
if (!virtio_queue_get_num(vdev, n)) {
break;
}
r = virtio_mmio_set_guest_notifier(d, n, assign, with_irqfd);
if (r < 0) {
goto assign_error;
}
}
return 0;
assign_error:
/* We get here on assignment failure. Recover by undoing for VQs 0 .. n. */
assert(assign);
while (--n >= 0) {
virtio_mmio_set_guest_notifier(d, n, !assign, false);
}
return r;
}
static void virtio_mmio_pre_plugged(DeviceState *d, Error **errp)
{
VirtIOMMIOProxy *proxy = VIRTIO_MMIO(d);
VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
if (!proxy->legacy) {
virtio_add_feature(&vdev->host_features, VIRTIO_F_VERSION_1);
}
}
/* virtio-mmio device */
static Property virtio_mmio_properties[] = {
DEFINE_PROP_BOOL("format_transport_address", VirtIOMMIOProxy,
format_transport_address, true),
DEFINE_PROP_BOOL("force-legacy", VirtIOMMIOProxy, legacy, true),
DEFINE_PROP_END_OF_LIST(),
};
static void virtio_mmio_realizefn(DeviceState *d, Error **errp)
{
VirtIOMMIOProxy *proxy = VIRTIO_MMIO(d);
SysBusDevice *sbd = SYS_BUS_DEVICE(d);
qbus_create_inplace(&proxy->bus, sizeof(proxy->bus), TYPE_VIRTIO_MMIO_BUS,
d, NULL);
sysbus_init_irq(sbd, &proxy->irq);
if (proxy->legacy) {
memory_region_init_io(&proxy->iomem, OBJECT(d),
&virtio_legacy_mem_ops, proxy,
TYPE_VIRTIO_MMIO, 0x200);
} else {
memory_region_init_io(&proxy->iomem, OBJECT(d),
&virtio_mem_ops, proxy,
TYPE_VIRTIO_MMIO, 0x200);
}
sysbus_init_mmio(sbd, &proxy->iomem);
}
static void virtio_mmio_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
dc->realize = virtio_mmio_realizefn;
dc->reset = virtio_mmio_reset;
set_bit(DEVICE_CATEGORY_MISC, dc->categories);
dc->props = virtio_mmio_properties;
}
static const TypeInfo virtio_mmio_info = {
.name = TYPE_VIRTIO_MMIO,
.parent = TYPE_SYS_BUS_DEVICE,
.instance_size = sizeof(VirtIOMMIOProxy),
.class_init = virtio_mmio_class_init,
};
/* virtio-mmio-bus. */
static char *virtio_mmio_bus_get_dev_path(DeviceState *dev)
{
BusState *virtio_mmio_bus;
VirtIOMMIOProxy *virtio_mmio_proxy;
char *proxy_path;
SysBusDevice *proxy_sbd;
char *path;
virtio_mmio_bus = qdev_get_parent_bus(dev);
virtio_mmio_proxy = VIRTIO_MMIO(virtio_mmio_bus->parent);
proxy_path = qdev_get_dev_path(DEVICE(virtio_mmio_proxy));
/*
* If @format_transport_address is false, then we just perform the same as
* virtio_bus_get_dev_path(): we delegate the address formatting for the
* device on the virtio-mmio bus to the bus that the virtio-mmio proxy
* (i.e., the device that implements the virtio-mmio bus) resides on. In
* this case the base address of the virtio-mmio transport will be
* invisible.
*/
if (!virtio_mmio_proxy->format_transport_address) {
return proxy_path;
}
/* Otherwise, we append the base address of the transport. */
proxy_sbd = SYS_BUS_DEVICE(virtio_mmio_proxy);
assert(proxy_sbd->num_mmio == 1);
assert(proxy_sbd->mmio[0].memory == &virtio_mmio_proxy->iomem);
if (proxy_path) {
path = g_strdup_printf("%s/virtio-mmio@" TARGET_FMT_plx, proxy_path,
proxy_sbd->mmio[0].addr);
} else {
path = g_strdup_printf("virtio-mmio@" TARGET_FMT_plx,
proxy_sbd->mmio[0].addr);
}
g_free(proxy_path);
return path;
}
static void virtio_mmio_bus_class_init(ObjectClass *klass, void *data)
{
BusClass *bus_class = BUS_CLASS(klass);
VirtioBusClass *k = VIRTIO_BUS_CLASS(klass);
k->notify = virtio_mmio_update_irq;
k->save_config = virtio_mmio_save_config;
k->load_config = virtio_mmio_load_config;
k->save_extra_state = virtio_mmio_save_extra_state;
k->load_extra_state = virtio_mmio_load_extra_state;
k->has_extra_state = virtio_mmio_has_extra_state;
k->set_guest_notifiers = virtio_mmio_set_guest_notifiers;
k->ioeventfd_enabled = virtio_mmio_ioeventfd_enabled;
k->ioeventfd_assign = virtio_mmio_ioeventfd_assign;
k->pre_plugged = virtio_mmio_pre_plugged;
k->has_variable_vring_alignment = true;
bus_class->max_dev = 1;
bus_class->get_dev_path = virtio_mmio_bus_get_dev_path;
}
static const TypeInfo virtio_mmio_bus_info = {
.name = TYPE_VIRTIO_MMIO_BUS,
.parent = TYPE_VIRTIO_BUS,
.instance_size = sizeof(VirtioBusState),
.class_init = virtio_mmio_bus_class_init,
};
static void virtio_mmio_register_types(void)
{
type_register_static(&virtio_mmio_bus_info);
type_register_static(&virtio_mmio_info);
}
type_init(virtio_mmio_register_types)
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