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https://gitlab.com/qemu-project/qemu
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hw/virtio: Add support for VDPA network simulation devices
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>
This commit is contained in:
Hao Chen
Michael S. Tsirkin
parent
043e127a12
commit
cd341fd1ff
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@ -2372,6 +2372,11 @@ F: hw/virtio/vhost-user-scmi*
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F: include/hw/virtio/vhost-user-scmi.h
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F: tests/qtest/libqos/virtio-scmi.*
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vdpa-net
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M: Hao Chen <chenh@yusur.tech>
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S: Maintained
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F: docs/system/devices/vdpa-net.rst
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virtio-crypto
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M: Gonglei <arei.gonglei@huawei.com>
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S: Supported
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@ -99,3 +99,4 @@ Emulated Devices
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devices/canokey.rst
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devices/usb-u2f.rst
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devices/igb.rst
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devices/vdpa-net.rst
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121
docs/system/devices/vdpa-net.rst
Normal file
121
docs/system/devices/vdpa-net.rst
Normal file
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@ -0,0 +1,121 @@
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vdpa net
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============
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This document explains the setup and usage of the vdpa network device.
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The vdpa network device is a paravirtualized vdpa emulate device.
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Description
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-----------
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VDPA net devices support dirty page bitmap mark and vring state saving and recovery.
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Users can use this VDPA device for live migration simulation testing in a nested virtualization environment.
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Registers layout
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----------------
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The vdpa device add live migrate registers layout as follow::
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Offset Register Name Bitwidth Associated vq
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0x0 LM_LOGGING_CTRL 4bits
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0x10 LM_BASE_ADDR_LOW 32bits
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0x14 LM_BASE_ADDR_HIGH 32bits
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0x18 LM_END_ADDR_LOW 32bits
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0x1c LM_END_ADDR_HIGH 32bits
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0x20 LM_RING_STATE_OFFSET 32bits vq0
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0x24 LM_RING_STATE_OFFSET 32bits vq1
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0x28 LM_RING_STATE_OFFSET 32bits vq2
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......
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0x20+1023*4 LM_RING_STATE_OFFSET 32bits vq1023
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These registers are extended at the end of the notify bar space.
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Architecture diagram
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--------------------
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::
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|------------------------------------------------------------------------|
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| guest-L1-user-space |
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| |
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| |----------------------------------------|
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| | [virtio-net driver] |
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| | ^ guest-L2-src(iommu=on) |
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| |--------------|-------------------------|
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| | | qemu-L2-src(viommu) |
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| [dpdk-vdpa]<->[vhost socket]<-+->[vhost-user backend(iommu=on)] |
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--------------------------------------------------------------------------
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--------------------------------------------------------------------------
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| ^ guest-L1-kernel-space |
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| | |
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| [VFIO] |
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| ^ |
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| | guest-L1-src(iommu=on) |
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--------|-----------------------------------------------------------------
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--------|-----------------------------------------------------------------
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| [vdpa net device(iommu=on)] [manager nic device] |
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| | | |
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| | | |
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| [tap device] qemu-L1-src(viommu) | |
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------------------------------------------------+-------------------------
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--------------------- |
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| kernel net bridge |<-----
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| virbr0 |<----------------------------------
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--------------------- |
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-------------------------------------------------------------------------- |
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| guest-L1-user-space | |
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| | |
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| |----------------------------------------| |
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| | [virtio-net driver] | |
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| | ^ guest-L2-dst(iommu=on) | |
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| |--------------|-------------------------| |
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| | | qemu-L2-dst(viommu) | |
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| [dpdk-vdpa]<->[vhost socket]<-+->[vhost-user backend(iommu=on)] | |
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-------------------------------------------------------------------------- |
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-------------------------------------------------------------------------- |
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| ^ guest-L1-kernel-space | |
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| | | |
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| [VFIO] | |
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| ^ | |
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| | guest-L1-dst(iommu=on) | |
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--------|----------------------------------------------------------------- |
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--------|----------------------------------------------------------------- |
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| [vdpa net device(iommu=on)] [manager nic device]----------------+----
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| | |
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| | |
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| [tap device] qemu-L1-dst(viommu) |
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--------------------------------------------------------------------------
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Device properties
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-----------------
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The Virtio vdpa device can be configured with the following properties:
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* ``vdpa=on`` open vdpa device emulated.
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Usages
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--------
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This patch add virtio sriov support and vdpa live migrate support.
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You can open vdpa by set xml file as follow::
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<qemu:commandline xmlns:qemu='http://libvirt.org/schemas/domain/qemu/1.0'>
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<qemu:arg value='-device'/>
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<qemu:arg value='intel-iommu,intremap=on,device-iotlb=on,aw-bits=48'/>
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<qemu:arg value='-netdev'/>
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<qemu:arg value='tap,id=hostnet1,script=no,downscript=no,vhost=off'/>
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<qemu:arg value='-device'/>
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<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'/>
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</qemu:commandline>
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Limitations
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-----------
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1. Dependent on tap device with param ``vhost=off``.
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2. Nested virtualization environment only supports ``q35`` machines.
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3. Current only support split vring live migrate.
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@ -1999,6 +1999,22 @@ static ssize_t virtio_net_receive_rcu(NetClientState *nc, const uint8_t *buf,
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goto err;
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}
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/* Mark dirty page's bitmap of guest memory */
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if (vdev->lm_logging_ctrl == LM_ENABLE) {
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uint64_t chunk = elem->in_addr[i] / VHOST_LOG_CHUNK;
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/* Get chunk index */
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BitmapMemoryRegionCaches *caches = qatomic_rcu_read(&vdev->caches);
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uint64_t index = chunk / 8;
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uint64_t shift = chunk % 8;
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uint8_t val = 0;
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address_space_read_cached(&caches->bitmap, index, &val,
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sizeof(val));
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val |= 1 << shift;
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address_space_write_cached(&caches->bitmap, index, &val,
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sizeof(val));
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address_space_cache_invalidate(&caches->bitmap, index, sizeof(val));
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}
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elems[i] = elem;
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lens[i] = total;
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i++;
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@ -1442,6 +1442,155 @@ int virtio_pci_add_shm_cap(VirtIOPCIProxy *proxy,
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return virtio_pci_add_mem_cap(proxy, &cap.cap);
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}
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/* Called within call_rcu(). */
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static void bitmap_free_region_cache(BitmapMemoryRegionCaches *caches)
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{
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assert(caches != NULL);
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address_space_cache_destroy(&caches->bitmap);
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g_free(caches);
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}
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static void lm_disable(VirtIODevice *vdev)
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{
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BitmapMemoryRegionCaches *caches;
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caches = qatomic_read(&vdev->caches);
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qatomic_rcu_set(&vdev->caches, NULL);
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if (caches) {
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call_rcu(caches, bitmap_free_region_cache, rcu);
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}
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}
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static void lm_enable(VirtIODevice *vdev)
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{
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BitmapMemoryRegionCaches *old = vdev->caches;
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BitmapMemoryRegionCaches *new = NULL;
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hwaddr addr, end, size;
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int64_t len;
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addr = vdev->lm_base_addr_low | ((hwaddr)(vdev->lm_base_addr_high) << 32);
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end = vdev->lm_end_addr_low | ((hwaddr)(vdev->lm_end_addr_high) << 32);
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size = end - addr;
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if (size <= 0) {
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error_report("Invalid lm size.");
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return;
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}
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new = g_new0(BitmapMemoryRegionCaches, 1);
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len = address_space_cache_init(&new->bitmap, vdev->dma_as, addr, size,
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true);
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if (len < size) {
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virtio_error(vdev, "Cannot map bitmap");
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goto err_bitmap;
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}
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qatomic_rcu_set(&vdev->caches, new);
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if (old) {
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call_rcu(old, bitmap_free_region_cache, rcu);
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}
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return;
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err_bitmap:
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address_space_cache_destroy(&new->bitmap);
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g_free(new);
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}
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static uint64_t virtio_pci_lm_read(void *opaque, hwaddr addr,
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unsigned size)
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{
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VirtIOPCIProxy *proxy = opaque;
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VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
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hwaddr offset_end = LM_VRING_STATE_OFFSET +
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virtio_pci_queue_mem_mult(proxy) * VIRTIO_QUEUE_MAX;
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uint32_t val;
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int qid;
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if (vdev == NULL) {
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return UINT64_MAX;
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}
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switch (addr) {
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case LM_LOGGING_CTRL:
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val = vdev->lm_logging_ctrl;
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break;
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case LM_BASE_ADDR_LOW:
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val = vdev->lm_base_addr_low;
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break;
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case LM_BASE_ADDR_HIGH:
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val = vdev->lm_base_addr_high;
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break;
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case LM_END_ADDR_LOW:
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val = vdev->lm_end_addr_low;
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break;
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case LM_END_ADDR_HIGH:
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val = vdev->lm_end_addr_high;
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break;
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default:
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if (addr >= LM_VRING_STATE_OFFSET && addr <= offset_end) {
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qid = (addr - LM_VRING_STATE_OFFSET) /
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virtio_pci_queue_mem_mult(proxy);
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val = virtio_queue_get_vring_states(vdev, qid);
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} else
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val = 0;
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break;
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}
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return val;
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}
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static void virtio_pci_lm_write(void *opaque, hwaddr addr,
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uint64_t val, unsigned size)
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{
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VirtIOPCIProxy *proxy = opaque;
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VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
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hwaddr offset_end = LM_VRING_STATE_OFFSET +
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virtio_pci_queue_mem_mult(proxy) * VIRTIO_QUEUE_MAX;
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int qid;
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if (vdev == NULL) {
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return;
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}
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switch (addr) {
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case LM_LOGGING_CTRL:
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vdev->lm_logging_ctrl = val;
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switch (val) {
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case LM_DISABLE:
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lm_disable(vdev);
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break;
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case LM_ENABLE:
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lm_enable(vdev);
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break;
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default:
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virtio_error(vdev, "Unsupport LM_LOGGING_CTRL value: %"PRIx64,
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val);
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break;
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};
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break;
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case LM_BASE_ADDR_LOW:
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vdev->lm_base_addr_low = val;
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break;
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case LM_BASE_ADDR_HIGH:
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vdev->lm_base_addr_high = val;
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break;
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case LM_END_ADDR_LOW:
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vdev->lm_end_addr_low = val;
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break;
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case LM_END_ADDR_HIGH:
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vdev->lm_end_addr_high = val;
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break;
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default:
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if (addr >= LM_VRING_STATE_OFFSET && addr <= offset_end) {
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qid = (addr - LM_VRING_STATE_OFFSET) /
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virtio_pci_queue_mem_mult(proxy);
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virtio_queue_set_vring_states(vdev, qid, val);
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} else
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virtio_error(vdev, "Unsupport addr: %"PRIx64, addr);
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break;
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}
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}
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static uint64_t virtio_pci_common_read(void *opaque, hwaddr addr,
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unsigned size)
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{
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@ -1823,6 +1972,15 @@ static void virtio_pci_modern_regions_init(VirtIOPCIProxy *proxy,
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},
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.endianness = DEVICE_LITTLE_ENDIAN,
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};
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static const MemoryRegionOps lm_ops = {
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.read = virtio_pci_lm_read,
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.write = virtio_pci_lm_write,
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.impl = {
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.min_access_size = 1,
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.max_access_size = 4,
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},
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.endianness = DEVICE_LITTLE_ENDIAN,
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};
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g_autoptr(GString) name = g_string_new(NULL);
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g_string_printf(name, "virtio-pci-common-%s", vdev_name);
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@ -1859,6 +2017,14 @@ static void virtio_pci_modern_regions_init(VirtIOPCIProxy *proxy,
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proxy,
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name->str,
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proxy->notify_pio.size);
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if (proxy->flags & VIRTIO_PCI_FLAG_VDPA) {
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g_string_printf(name, "virtio-pci-lm-%s", vdev_name);
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memory_region_init_io(&proxy->lm.mr, OBJECT(proxy),
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&lm_ops,
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proxy,
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name->str,
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proxy->lm.size);
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}
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}
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static void virtio_pci_modern_region_map(VirtIOPCIProxy *proxy,
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@ -2021,6 +2187,10 @@ static void virtio_pci_device_plugged(DeviceState *d, Error **errp)
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virtio_pci_modern_mem_region_map(proxy, &proxy->isr, &cap);
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virtio_pci_modern_mem_region_map(proxy, &proxy->device, &cap);
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virtio_pci_modern_mem_region_map(proxy, &proxy->notify, ¬ify.cap);
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if (proxy->flags & VIRTIO_PCI_FLAG_VDPA) {
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memory_region_add_subregion(&proxy->modern_bar,
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proxy->lm.offset, &proxy->lm.mr);
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}
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if (modern_pio) {
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memory_region_init(&proxy->io_bar, OBJECT(proxy),
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@ -2090,6 +2260,9 @@ static void virtio_pci_device_unplugged(DeviceState *d)
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virtio_pci_modern_mem_region_unmap(proxy, &proxy->isr);
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virtio_pci_modern_mem_region_unmap(proxy, &proxy->device);
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virtio_pci_modern_mem_region_unmap(proxy, &proxy->notify);
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if (proxy->flags & VIRTIO_PCI_FLAG_VDPA) {
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memory_region_del_subregion(&proxy->modern_bar, &proxy->lm.mr);
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}
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if (modern_pio) {
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virtio_pci_modern_io_region_unmap(proxy, &proxy->notify_pio);
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}
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@ -2144,9 +2317,17 @@ static void virtio_pci_realize(PCIDevice *pci_dev, Error **errp)
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proxy->notify_pio.type = VIRTIO_PCI_CAP_NOTIFY_CFG;
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/* subclasses can enforce modern, so do this unconditionally */
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memory_region_init(&proxy->modern_bar, OBJECT(proxy), "virtio-pci",
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/* PCI BAR regions must be powers of 2 */
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pow2ceil(proxy->notify.offset + proxy->notify.size));
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if (!(proxy->flags & VIRTIO_PCI_FLAG_VDPA)) {
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memory_region_init(&proxy->modern_bar, OBJECT(proxy), "virtio-pci",
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/* PCI BAR regions must be powers of 2 */
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pow2ceil(proxy->notify.offset + proxy->notify.size));
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} else {
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proxy->lm.offset = proxy->notify.offset + proxy->notify.size;
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proxy->lm.size = 0x20 + VIRTIO_QUEUE_MAX * 4;
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memory_region_init(&proxy->modern_bar, OBJECT(proxy), "virtio-pci",
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/* PCI BAR regions must be powers of 2 */
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pow2ceil(proxy->lm.offset + proxy->lm.size));
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}
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if (proxy->disable_legacy == ON_OFF_AUTO_AUTO) {
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proxy->disable_legacy = pcie_port ? ON_OFF_AUTO_ON : ON_OFF_AUTO_OFF;
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@ -2301,6 +2482,8 @@ static Property virtio_pci_properties[] = {
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VIRTIO_PCI_FLAG_INIT_FLR_BIT, true),
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DEFINE_PROP_BIT("aer", VirtIOPCIProxy, flags,
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VIRTIO_PCI_FLAG_AER_BIT, false),
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DEFINE_PROP_BIT("vdpa", VirtIOPCIProxy, flags,
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VIRTIO_PCI_FLAG_VDPA_BIT, false),
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DEFINE_PROP_END_OF_LIST(),
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};
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|
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@ -3368,6 +3368,18 @@ static uint16_t virtio_queue_split_get_last_avail_idx(VirtIODevice *vdev,
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return vdev->vq[n].last_avail_idx;
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}
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static uint32_t virtio_queue_split_get_vring_states(VirtIODevice *vdev,
|
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int n)
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{
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struct VirtQueue *vq = &vdev->vq[n];
|
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uint16_t avail, used;
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|
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avail = vq->last_avail_idx;
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used = vq->used_idx;
|
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|
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return avail | (uint32_t)used << 16;
|
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}
|
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|
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unsigned int virtio_queue_get_last_avail_idx(VirtIODevice *vdev, int n)
|
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{
|
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if (virtio_vdev_has_feature(vdev, VIRTIO_F_RING_PACKED)) {
|
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|
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@ -3377,6 +3389,33 @@ unsigned int virtio_queue_get_last_avail_idx(VirtIODevice *vdev, int n)
|
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}
|
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}
|
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|
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unsigned int virtio_queue_get_vring_states(VirtIODevice *vdev, int n)
|
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{
|
||||
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)
|
||||
{
|
||||
|
|
|
|||
|
|
@ -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;
|
||||
|
|
|
|||
|
|
@ -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);
|
||||
|
|
|
|||
|
|
@ -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. */
|
||||
|
|
|
|||
Loading…
Reference in New Issue
Block a user