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qemu/hw/virtio/virtio-mmio.c
Laurent Vivier 2d9e7d4cdd virtio-mmio: fix guest kernel crash with SHM regions 
In the kernel, virtio_gpu_init() uses virtio_get_shm_region()
since
commit 6076a9711dc5 ("drm/virtio: implement blob resources: probe for host visible region")
but vm_get_shm_region() unconditionally uses VIRTIO_MMIO_SHM_SEL to
get the address and the length of the region.

commit 38e895487afc ("virtio: Implement get_shm_region for MMIO transport"

As this is not implemented in QEMU, address and length are 0 and passed
as is to devm_request_mem_region() that triggers a crash:

  [drm:virtio_gpu_init] *ERROR* Could not reserve host visible region
  Unable to handle kernel NULL pointer dereference at virtual address (ptrval)

According to the comments in the kernel, a non existent shared region
has a length of (u64)-1.

This is what we return now with this patch to disable the region.

Signed-off-by: Laurent Vivier <laurent@vivier.eu>
Message-Id: <20201220163539.2255963-1-laurent@vivier.eu>
Acked-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Stefano Garzarella <sgarzare@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
2021-02-05 08:52:58 -05:00

809 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-mmio.h"
#include "qemu/error-report.h"
#include "qemu/log.h"
#include "trace.h"
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 void virtio_mmio_soft_reset(VirtIOMMIOProxy *proxy)
{
int i;
if (proxy->legacy) {
return;
}
for (i = 0; i < VIRTIO_QUEUE_MAX; i++) {
proxy->vqs[i].enabled = 0;
}
}
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 qatomic_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_SHM_LEN_LOW:
case VIRTIO_MMIO_SHM_LEN_HIGH:
/*
* VIRTIO_MMIO_SHM_SEL is unimplemented
* according to the linux driver, if region length is -1
* the shared memory doesn't exist
*/
return -1;
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);
virtio_queue_set_num(vdev, vdev->queue_sel, value);
if (proxy->legacy) {
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:
qatomic_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);
virtio_mmio_soft_reset(proxy);
}
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 = (qatomic_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);
device_class_set_props(dc, 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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