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[PULL 32/68] hw/virtio: Add support for VDPA network simulation devices
|
From: |
Michael S. Tsirkin |
|
Subject: |
[PULL 32/68] hw/virtio: Add support for VDPA network simulation devices |
|
Date: |
Tue, 12 Mar 2024 18:27:09 -0400 |
From: Hao Chen <chenh@yusur.tech>
This patch adds support for VDPA network simulation devices.
The device is developed based on virtio-net and tap backend,
and supports hardware live migration function.
For more details, please refer to "docs/system/devices/vdpa-net.rst"
Signed-off-by: Hao Chen <chenh@yusur.tech>
Message-Id: <20240221073802.2888022-1-chenh@yusur.tech>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
---
include/hw/virtio/virtio-pci.h | 5 +
include/hw/virtio/virtio.h | 19 ++
include/standard-headers/linux/virtio_pci.h | 7 +
hw/net/virtio-net.c | 16 ++
hw/virtio/virtio-pci.c | 189 +++++++++++++++++++-
hw/virtio/virtio.c | 39 ++++
MAINTAINERS | 5 +
docs/system/device-emulation.rst | 1 +
docs/system/devices/vdpa-net.rst | 121 +++++++++++++
9 files changed, 399 insertions(+), 3 deletions(-)
create mode 100644 docs/system/devices/vdpa-net.rst
diff --git a/include/hw/virtio/virtio-pci.h b/include/hw/virtio/virtio-pci.h
index 59d88018c1..4d57a9c751 100644
--- a/include/hw/virtio/virtio-pci.h
+++ b/include/hw/virtio/virtio-pci.h
@@ -43,6 +43,7 @@ enum {
VIRTIO_PCI_FLAG_INIT_FLR_BIT,
VIRTIO_PCI_FLAG_AER_BIT,
VIRTIO_PCI_FLAG_ATS_PAGE_ALIGNED_BIT,
+ VIRTIO_PCI_FLAG_VDPA_BIT,
};
/* Need to activate work-arounds for buggy guests at vmstate load. */
@@ -89,6 +90,9 @@ enum {
#define VIRTIO_PCI_FLAG_ATS_PAGE_ALIGNED \
(1 << VIRTIO_PCI_FLAG_ATS_PAGE_ALIGNED_BIT)
+/* VDPA supported flags */
+#define VIRTIO_PCI_FLAG_VDPA (1 << VIRTIO_PCI_FLAG_VDPA_BIT)
+
typedef struct {
MSIMessage msg;
int virq;
@@ -140,6 +144,7 @@ struct VirtIOPCIProxy {
};
VirtIOPCIRegion regs[5];
};
+ VirtIOPCIRegion lm;
MemoryRegion modern_bar;
MemoryRegion io_bar;
uint32_t legacy_io_bar_idx;
diff --git a/include/hw/virtio/virtio.h b/include/hw/virtio/virtio.h
index c8f72850bc..b3c74a1bca 100644
--- a/include/hw/virtio/virtio.h
+++ b/include/hw/virtio/virtio.h
@@ -35,6 +35,9 @@
(0x1ULL << VIRTIO_F_NOTIFY_ON_EMPTY) | \
(0x1ULL << VIRTIO_F_ANY_LAYOUT))
+#define LM_DISABLE 0x00
+#define LM_ENABLE 0x01
+
struct VirtQueue;
static inline hwaddr vring_align(hwaddr addr,
@@ -95,6 +98,11 @@ enum virtio_device_endian {
VIRTIO_DEVICE_ENDIAN_BIG,
};
+typedef struct BitmapMemoryRegionCaches {
+ struct rcu_head rcu;
+ MemoryRegionCache bitmap;
+} BitmapMemoryRegionCaches;
+
/**
* struct VirtIODevice - common VirtIO structure
* @name: name of the device
@@ -128,6 +136,14 @@ struct VirtIODevice
uint32_t generation;
int nvectors;
VirtQueue *vq;
+ uint8_t lm_logging_ctrl;
+ uint32_t lm_base_addr_low;
+ uint32_t lm_base_addr_high;
+ uint32_t lm_end_addr_low;
+ uint32_t lm_end_addr_high;
+
+ BitmapMemoryRegionCaches *caches;
+
MemoryListener listener;
uint16_t device_id;
/* @vm_running: current VM running state via virtio_vmstate_change() */
@@ -379,8 +395,11 @@ hwaddr virtio_queue_get_desc_size(VirtIODevice *vdev, int
n);
hwaddr virtio_queue_get_avail_size(VirtIODevice *vdev, int n);
hwaddr virtio_queue_get_used_size(VirtIODevice *vdev, int n);
unsigned int virtio_queue_get_last_avail_idx(VirtIODevice *vdev, int n);
+unsigned int virtio_queue_get_vring_states(VirtIODevice *vdev, int n);
void virtio_queue_set_last_avail_idx(VirtIODevice *vdev, int n,
unsigned int idx);
+void virtio_queue_set_vring_states(VirtIODevice *vdev, int n,
+ unsigned int idx);
void virtio_queue_restore_last_avail_idx(VirtIODevice *vdev, int n);
void virtio_queue_invalidate_signalled_used(VirtIODevice *vdev, int n);
void virtio_queue_update_used_idx(VirtIODevice *vdev, int n);
diff --git a/include/standard-headers/linux/virtio_pci.h
b/include/standard-headers/linux/virtio_pci.h
index 3e2bc2c97e..86733278ba 100644
--- a/include/standard-headers/linux/virtio_pci.h
+++ b/include/standard-headers/linux/virtio_pci.h
@@ -221,6 +221,13 @@ struct virtio_pci_cfg_cap {
#define VIRTIO_PCI_COMMON_ADM_Q_IDX 60
#define VIRTIO_PCI_COMMON_ADM_Q_NUM 62
+#define LM_LOGGING_CTRL 0
+#define LM_BASE_ADDR_LOW 4
+#define LM_BASE_ADDR_HIGH 8
+#define LM_END_ADDR_LOW 12
+#define LM_END_ADDR_HIGH 16
+#define LM_VRING_STATE_OFFSET 0x20
+
#endif /* VIRTIO_PCI_NO_MODERN */
/* Admin command status. */
diff --git a/hw/net/virtio-net.c b/hw/net/virtio-net.c
index a3c711b56d..27055a4b8e 100644
--- a/hw/net/virtio-net.c
+++ b/hw/net/virtio-net.c
@@ -1999,6 +1999,22 @@ static ssize_t virtio_net_receive_rcu(NetClientState
*nc, const uint8_t *buf,
goto err;
}
+ /* Mark dirty page's bitmap of guest memory */
+ if (vdev->lm_logging_ctrl == LM_ENABLE) {
+ uint64_t chunk = elem->in_addr[i] / VHOST_LOG_CHUNK;
+ /* Get chunk index */
+ BitmapMemoryRegionCaches *caches = qatomic_rcu_read(&vdev->caches);
+ uint64_t index = chunk / 8;
+ uint64_t shift = chunk % 8;
+ uint8_t val = 0;
+ address_space_read_cached(&caches->bitmap, index, &val,
+ sizeof(val));
+ val |= 1 << shift;
+ address_space_write_cached(&caches->bitmap, index, &val,
+ sizeof(val));
+ address_space_cache_invalidate(&caches->bitmap, index,
sizeof(val));
+ }
+
elems[i] = elem;
lens[i] = total;
i++;
diff --git a/hw/virtio/virtio-pci.c b/hw/virtio/virtio-pci.c
index 1a7039fb0c..e42ac6e7f9 100644
--- a/hw/virtio/virtio-pci.c
+++ b/hw/virtio/virtio-pci.c
@@ -1442,6 +1442,155 @@ int virtio_pci_add_shm_cap(VirtIOPCIProxy *proxy,
return virtio_pci_add_mem_cap(proxy, &cap.cap);
}
+/* Called within call_rcu(). */
+static void bitmap_free_region_cache(BitmapMemoryRegionCaches *caches)
+{
+ assert(caches != NULL);
+ address_space_cache_destroy(&caches->bitmap);
+ g_free(caches);
+}
+
+static void lm_disable(VirtIODevice *vdev)
+{
+ BitmapMemoryRegionCaches *caches;
+ caches = qatomic_read(&vdev->caches);
+ qatomic_rcu_set(&vdev->caches, NULL);
+ if (caches) {
+ call_rcu(caches, bitmap_free_region_cache, rcu);
+ }
+}
+
+static void lm_enable(VirtIODevice *vdev)
+{
+ BitmapMemoryRegionCaches *old = vdev->caches;
+ BitmapMemoryRegionCaches *new = NULL;
+ hwaddr addr, end, size;
+ int64_t len;
+
+ addr = vdev->lm_base_addr_low | ((hwaddr)(vdev->lm_base_addr_high) << 32);
+ end = vdev->lm_end_addr_low | ((hwaddr)(vdev->lm_end_addr_high) << 32);
+ size = end - addr;
+ if (size <= 0) {
+ error_report("Invalid lm size.");
+ return;
+ }
+
+ new = g_new0(BitmapMemoryRegionCaches, 1);
+ len = address_space_cache_init(&new->bitmap, vdev->dma_as, addr, size,
+ true);
+ if (len < size) {
+ virtio_error(vdev, "Cannot map bitmap");
+ goto err_bitmap;
+ }
+ qatomic_rcu_set(&vdev->caches, new);
+
+ if (old) {
+ call_rcu(old, bitmap_free_region_cache, rcu);
+ }
+
+ return;
+
+err_bitmap:
+ address_space_cache_destroy(&new->bitmap);
+ g_free(new);
+}
+
+static uint64_t virtio_pci_lm_read(void *opaque, hwaddr addr,
+ unsigned size)
+{
+ VirtIOPCIProxy *proxy = opaque;
+ VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
+ hwaddr offset_end = LM_VRING_STATE_OFFSET +
+ virtio_pci_queue_mem_mult(proxy) * VIRTIO_QUEUE_MAX;
+ uint32_t val;
+ int qid;
+
+ if (vdev == NULL) {
+ return UINT64_MAX;
+ }
+ switch (addr) {
+ case LM_LOGGING_CTRL:
+ val = vdev->lm_logging_ctrl;
+ break;
+ case LM_BASE_ADDR_LOW:
+ val = vdev->lm_base_addr_low;
+ break;
+ case LM_BASE_ADDR_HIGH:
+ val = vdev->lm_base_addr_high;
+ break;
+ case LM_END_ADDR_LOW:
+ val = vdev->lm_end_addr_low;
+ break;
+ case LM_END_ADDR_HIGH:
+ val = vdev->lm_end_addr_high;
+ break;
+ default:
+ if (addr >= LM_VRING_STATE_OFFSET && addr <= offset_end) {
+ qid = (addr - LM_VRING_STATE_OFFSET) /
+ virtio_pci_queue_mem_mult(proxy);
+ val = virtio_queue_get_vring_states(vdev, qid);
+ } else
+ val = 0;
+
+ break;
+ }
+
+ return val;
+}
+
+static void virtio_pci_lm_write(void *opaque, hwaddr addr,
+ uint64_t val, unsigned size)
+{
+ VirtIOPCIProxy *proxy = opaque;
+ VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
+ hwaddr offset_end = LM_VRING_STATE_OFFSET +
+ virtio_pci_queue_mem_mult(proxy) * VIRTIO_QUEUE_MAX;
+ int qid;
+
+ if (vdev == NULL) {
+ return;
+ }
+
+ switch (addr) {
+ case LM_LOGGING_CTRL:
+ vdev->lm_logging_ctrl = val;
+ switch (val) {
+ case LM_DISABLE:
+ lm_disable(vdev);
+ break;
+ case LM_ENABLE:
+ lm_enable(vdev);
+ break;
+ default:
+ virtio_error(vdev, "Unsupport LM_LOGGING_CTRL value: %"PRIx64,
+ val);
+ break;
+ };
+
+ break;
+ case LM_BASE_ADDR_LOW:
+ vdev->lm_base_addr_low = val;
+ break;
+ case LM_BASE_ADDR_HIGH:
+ vdev->lm_base_addr_high = val;
+ break;
+ case LM_END_ADDR_LOW:
+ vdev->lm_end_addr_low = val;
+ break;
+ case LM_END_ADDR_HIGH:
+ vdev->lm_end_addr_high = val;
+ break;
+ default:
+ if (addr >= LM_VRING_STATE_OFFSET && addr <= offset_end) {
+ qid = (addr - LM_VRING_STATE_OFFSET) /
+ virtio_pci_queue_mem_mult(proxy);
+ virtio_queue_set_vring_states(vdev, qid, val);
+ } else
+ virtio_error(vdev, "Unsupport addr: %"PRIx64, addr);
+ break;
+ }
+}
+
static uint64_t virtio_pci_common_read(void *opaque, hwaddr addr,
unsigned size)
{
@@ -1823,6 +1972,15 @@ static void
virtio_pci_modern_regions_init(VirtIOPCIProxy *proxy,
},
.endianness = DEVICE_LITTLE_ENDIAN,
};
+ static const MemoryRegionOps lm_ops = {
+ .read = virtio_pci_lm_read,
+ .write = virtio_pci_lm_write,
+ .impl = {
+ .min_access_size = 1,
+ .max_access_size = 4,
+ },
+ .endianness = DEVICE_LITTLE_ENDIAN,
+ };
g_autoptr(GString) name = g_string_new(NULL);
g_string_printf(name, "virtio-pci-common-%s", vdev_name);
@@ -1859,6 +2017,14 @@ static void
virtio_pci_modern_regions_init(VirtIOPCIProxy *proxy,
proxy,
name->str,
proxy->notify_pio.size);
+ if (proxy->flags & VIRTIO_PCI_FLAG_VDPA) {
+ g_string_printf(name, "virtio-pci-lm-%s", vdev_name);
+ memory_region_init_io(&proxy->lm.mr, OBJECT(proxy),
+ &lm_ops,
+ proxy,
+ name->str,
+ proxy->lm.size);
+ }
}
static void virtio_pci_modern_region_map(VirtIOPCIProxy *proxy,
@@ -2021,6 +2187,10 @@ static void virtio_pci_device_plugged(DeviceState *d,
Error **errp)
virtio_pci_modern_mem_region_map(proxy, &proxy->isr, &cap);
virtio_pci_modern_mem_region_map(proxy, &proxy->device, &cap);
virtio_pci_modern_mem_region_map(proxy, &proxy->notify, ¬ify.cap);
+ if (proxy->flags & VIRTIO_PCI_FLAG_VDPA) {
+ memory_region_add_subregion(&proxy->modern_bar,
+ proxy->lm.offset, &proxy->lm.mr);
+ }
if (modern_pio) {
memory_region_init(&proxy->io_bar, OBJECT(proxy),
@@ -2090,6 +2260,9 @@ static void virtio_pci_device_unplugged(DeviceState *d)
virtio_pci_modern_mem_region_unmap(proxy, &proxy->isr);
virtio_pci_modern_mem_region_unmap(proxy, &proxy->device);
virtio_pci_modern_mem_region_unmap(proxy, &proxy->notify);
+ if (proxy->flags & VIRTIO_PCI_FLAG_VDPA) {
+ memory_region_del_subregion(&proxy->modern_bar, &proxy->lm.mr);
+ }
if (modern_pio) {
virtio_pci_modern_io_region_unmap(proxy, &proxy->notify_pio);
}
@@ -2144,9 +2317,17 @@ static void virtio_pci_realize(PCIDevice *pci_dev, Error
**errp)
proxy->notify_pio.type = VIRTIO_PCI_CAP_NOTIFY_CFG;
/* subclasses can enforce modern, so do this unconditionally */
- memory_region_init(&proxy->modern_bar, OBJECT(proxy), "virtio-pci",
- /* PCI BAR regions must be powers of 2 */
- pow2ceil(proxy->notify.offset + proxy->notify.size));
+ if (!(proxy->flags & VIRTIO_PCI_FLAG_VDPA)) {
+ memory_region_init(&proxy->modern_bar, OBJECT(proxy), "virtio-pci",
+ /* PCI BAR regions must be powers of 2 */
+ pow2ceil(proxy->notify.offset +
proxy->notify.size));
+ } else {
+ proxy->lm.offset = proxy->notify.offset + proxy->notify.size;
+ proxy->lm.size = 0x20 + VIRTIO_QUEUE_MAX * 4;
+ memory_region_init(&proxy->modern_bar, OBJECT(proxy), "virtio-pci",
+ /* PCI BAR regions must be powers of 2 */
+ pow2ceil(proxy->lm.offset + proxy->lm.size));
+ }
if (proxy->disable_legacy == ON_OFF_AUTO_AUTO) {
proxy->disable_legacy = pcie_port ? ON_OFF_AUTO_ON : ON_OFF_AUTO_OFF;
@@ -2301,6 +2482,8 @@ static Property virtio_pci_properties[] = {
VIRTIO_PCI_FLAG_INIT_FLR_BIT, true),
DEFINE_PROP_BIT("aer", VirtIOPCIProxy, flags,
VIRTIO_PCI_FLAG_AER_BIT, false),
+ DEFINE_PROP_BIT("vdpa", VirtIOPCIProxy, flags,
+ VIRTIO_PCI_FLAG_VDPA_BIT, false),
DEFINE_PROP_END_OF_LIST(),
};
diff --git a/hw/virtio/virtio.c b/hw/virtio/virtio.c
index d229755eae..fb6b4ccd83 100644
--- a/hw/virtio/virtio.c
+++ b/hw/virtio/virtio.c
@@ -3368,6 +3368,18 @@ static uint16_t
virtio_queue_split_get_last_avail_idx(VirtIODevice *vdev,
return vdev->vq[n].last_avail_idx;
}
+static uint32_t virtio_queue_split_get_vring_states(VirtIODevice *vdev,
+ int n)
+{
+ struct VirtQueue *vq = &vdev->vq[n];
+ uint16_t avail, used;
+
+ avail = vq->last_avail_idx;
+ used = vq->used_idx;
+
+ return avail | (uint32_t)used << 16;
+}
+
unsigned int virtio_queue_get_last_avail_idx(VirtIODevice *vdev, int n)
{
if (virtio_vdev_has_feature(vdev, VIRTIO_F_RING_PACKED)) {
@@ -3377,6 +3389,33 @@ unsigned int
virtio_queue_get_last_avail_idx(VirtIODevice *vdev, int n)
}
}
+unsigned int virtio_queue_get_vring_states(VirtIODevice *vdev, int n)
+{
+ if (virtio_vdev_has_feature(vdev, VIRTIO_F_RING_PACKED)) {
+ return -1;
+ } else {
+ return virtio_queue_split_get_vring_states(vdev, n);
+ }
+}
+
+static void virtio_queue_split_set_vring_states(VirtIODevice *vdev,
+ int n, uint32_t idx)
+{
+ struct VirtQueue *vq = &vdev->vq[n];
+ vq->last_avail_idx = (uint16_t)(idx & 0xffff);
+ vq->shadow_avail_idx = (uint16_t)(idx & 0xffff);
+ vq->used_idx = (uint16_t)(idx >> 16);
+}
+
+void virtio_queue_set_vring_states(VirtIODevice *vdev, int n, uint32_t idx)
+{
+ if (virtio_vdev_has_feature(vdev, VIRTIO_F_RING_PACKED)) {
+ return;
+ } else {
+ virtio_queue_split_set_vring_states(vdev, n, idx);
+ }
+}
+
static void virtio_queue_packed_set_last_avail_idx(VirtIODevice *vdev,
int n, unsigned int idx)
{
diff --git a/MAINTAINERS b/MAINTAINERS
index 4d96f855de..5abf6f54c4 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -2372,6 +2372,11 @@ F: hw/virtio/vhost-user-scmi*
F: include/hw/virtio/vhost-user-scmi.h
F: tests/qtest/libqos/virtio-scmi.*
+vdpa-net
+M: Hao Chen <chenh@yusur.tech>
+S: Maintained
+F: docs/system/devices/vdpa-net.rst
+
virtio-crypto
M: Gonglei <arei.gonglei@huawei.com>
S: Supported
diff --git a/docs/system/device-emulation.rst b/docs/system/device-emulation.rst
index f19777411c..e4a27f53c8 100644
--- a/docs/system/device-emulation.rst
+++ b/docs/system/device-emulation.rst
@@ -99,3 +99,4 @@ Emulated Devices
devices/canokey.rst
devices/usb-u2f.rst
devices/igb.rst
+ devices/vdpa-net.rst
diff --git a/docs/system/devices/vdpa-net.rst b/docs/system/devices/vdpa-net.rst
new file mode 100644
index 0000000000..323d8c926a
--- /dev/null
+++ b/docs/system/devices/vdpa-net.rst
@@ -0,0 +1,121 @@
+vdpa net
+============
+
+This document explains the setup and usage of the vdpa network device.
+The vdpa network device is a paravirtualized vdpa emulate device.
+
+Description
+-----------
+
+VDPA net devices support dirty page bitmap mark and vring state saving and
recovery.
+
+Users can use this VDPA device for live migration simulation testing in a
nested virtualization environment.
+
+Registers layout
+----------------
+
+The vdpa device add live migrate registers layout as follow::
+
+ Offset Register Name Bitwidth Associated vq
+ 0x0 LM_LOGGING_CTRL 4bits
+ 0x10 LM_BASE_ADDR_LOW 32bits
+ 0x14 LM_BASE_ADDR_HIGH 32bits
+ 0x18 LM_END_ADDR_LOW 32bits
+ 0x1c LM_END_ADDR_HIGH 32bits
+ 0x20 LM_RING_STATE_OFFSET 32bits vq0
+ 0x24 LM_RING_STATE_OFFSET 32bits vq1
+ 0x28 LM_RING_STATE_OFFSET 32bits vq2
+ ......
+ 0x20+1023*4 LM_RING_STATE_OFFSET 32bits vq1023
+
+These registers are extended at the end of the notify bar space.
+
+Architecture diagram
+--------------------
+::
+
+ |------------------------------------------------------------------------|
+ | guest-L1-user-space |
+ | |
+ | |----------------------------------------|
+ | | [virtio-net driver] |
+ | | ^ guest-L2-src(iommu=on) |
+ | |--------------|-------------------------|
+ | | | qemu-L2-src(viommu) |
+ | [dpdk-vdpa]<->[vhost socket]<-+->[vhost-user backend(iommu=on)] |
+ --------------------------------------------------------------------------
+ --------------------------------------------------------------------------
+ | ^ guest-L1-kernel-space |
+ | | |
+ | [VFIO] |
+ | ^ |
+ | | guest-L1-src(iommu=on) |
+ --------|-----------------------------------------------------------------
+ --------|-----------------------------------------------------------------
+ | [vdpa net device(iommu=on)] [manager nic device] |
+ | | | |
+ | | | |
+ | [tap device] qemu-L1-src(viommu) | |
+ ------------------------------------------------+-------------------------
+ |
+ |
+ --------------------- |
+ | kernel net bridge |<-----
+ | virbr0
|<----------------------------------
+ ---------------------
|
+
|
+
|
+ --------------------------------------------------------------------------
|
+ | guest-L1-user-space |
|
+ | |
|
+ | |----------------------------------------|
|
+ | | [virtio-net driver] |
|
+ | | ^ guest-L2-dst(iommu=on) |
|
+ | |--------------|-------------------------|
|
+ | | | qemu-L2-dst(viommu) |
|
+ | [dpdk-vdpa]<->[vhost socket]<-+->[vhost-user backend(iommu=on)] |
|
+ --------------------------------------------------------------------------
|
+ --------------------------------------------------------------------------
|
+ | ^ guest-L1-kernel-space |
|
+ | | |
|
+ | [VFIO] |
|
+ | ^ |
|
+ | | guest-L1-dst(iommu=on) |
|
+ --------|-----------------------------------------------------------------
|
+ --------|-----------------------------------------------------------------
|
+ | [vdpa net device(iommu=on)] [manager nic
device]----------------+----
+ | | |
+ | | |
+ | [tap device] qemu-L1-dst(viommu) |
+ --------------------------------------------------------------------------
+
+
+Device properties
+-----------------
+
+The Virtio vdpa device can be configured with the following properties:
+
+ * ``vdpa=on`` open vdpa device emulated.
+
+Usages
+--------
+This patch add virtio sriov support and vdpa live migrate support.
+You can open vdpa by set xml file as follow::
+
+ <qemu:commandline xmlns:qemu='http://libvirt.org/schemas/domain/qemu/1.0'>
+ <qemu:arg value='-device'/>
+ <qemu:arg value='intel-iommu,intremap=on,device-iotlb=on,aw-bits=48'/>
+ <qemu:arg value='-netdev'/>
+ <qemu:arg value='tap,id=hostnet1,script=no,downscript=no,vhost=off'/>
+ <qemu:arg value='-device'/>
+ <qemu:arg
value='virtio-net-pci,netdev=hostnet1,id=net1,mac=56:4a:b7:4f:4d:a9,bus=pci.6,addr=0x0,iommu_platform=on,ats=on,vdpa=on'/>
+ </qemu:commandline>
+
+Limitations
+-----------
+1. Dependent on tap device with param ``vhost=off``.
+2. Nested virtualization environment only supports ``q35`` machines.
+3. Current only support split vring live migrate.
+
+
+
--
MST
- [PULL 27/68] vdpa: stash memory region properties in vars, (continued)
- [PULL 27/68] vdpa: stash memory region properties in vars, Michael S. Tsirkin, 2024/03/12
- [PULL 20/68] libvhost-user: Factor out search for memory region by GPA and simplify, Michael S. Tsirkin, 2024/03/12
- [PULL 24/68] libvhost-user: Dynamically remap rings after (temporarily?) removing memory regions, Michael S. Tsirkin, 2024/03/12
- [PULL 28/68] vdpa: trace skipped memory sections, Michael S. Tsirkin, 2024/03/12
- [PULL 29/68] hw/pci-bridge/pxb-cxl: Drop RAS capability from host bridge., Michael S. Tsirkin, 2024/03/12
- [PULL 30/68] hw/audio/virtio-sound: return correct command response size, Michael S. Tsirkin, 2024/03/12
- [PULL 31/68] hw/virtio: check owner for removing objects, Michael S. Tsirkin, 2024/03/12
- [PULL 33/68] hw/cxl/cxl-host: Fix missing ERRP_GUARD() in cxl_fixed_memory_window_config(), Michael S. Tsirkin, 2024/03/12
- [PULL 25/68] libvhost-user: Mark mmap'ed region memory as MADV_DONTDUMP, Michael S. Tsirkin, 2024/03/12
- [PULL 32/68] hw/virtio: Add support for VDPA network simulation devices,
Michael S. Tsirkin <=
- [PULL 34/68] hw/display/macfb: Fix missing ERRP_GUARD() in macfb_nubus_realize(), Michael S. Tsirkin, 2024/03/12
- [PULL 35/68] hw/mem/cxl_type3: Fix missing ERRP_GUARD() in ct3_realize(), Michael S. Tsirkin, 2024/03/12
- [PULL 37/68] hw/pci-bridge/cxl_upstream: Fix missing ERRP_GUARD() in cxl_usp_realize(), Michael S. Tsirkin, 2024/03/12
- [PULL 42/68] hw/nvme: Use pcie_sriov_num_vfs(), Michael S. Tsirkin, 2024/03/12