From cd341fd1ffded978b2aa0b5309b00be7c42e347c Mon Sep 17 00:00:00 2001 From: Hao Chen Date: Wed, 21 Feb 2024 15:38:02 +0800 Subject: [PATCH] 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 Message-Id: <20240221073802.2888022-1-chenh@yusur.tech> Reviewed-by: Michael S. Tsirkin Signed-off-by: Michael S. Tsirkin --- MAINTAINERS | 5 + docs/system/device-emulation.rst | 1 + docs/system/devices/vdpa-net.rst | 121 +++++++++++++ hw/net/virtio-net.c | 16 ++ hw/virtio/virtio-pci.c | 189 +++++++++++++++++++- hw/virtio/virtio.c | 39 ++++ include/hw/virtio/virtio-pci.h | 5 + include/hw/virtio/virtio.h | 19 ++ include/standard-headers/linux/virtio_pci.h | 7 + 9 files changed, 399 insertions(+), 3 deletions(-) create mode 100644 docs/system/devices/vdpa-net.rst 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 +S: Maintained +F: docs/system/devices/vdpa-net.rst + virtio-crypto M: Gonglei 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:: + + + + + + + + + + +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. + + + 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/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. */