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Re: [RFC v3 7/8] vhost-vdpa: introduce vhost-vdpa backend
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From: |
Cindy Lu |
|
Subject: |
Re: [RFC v3 7/8] vhost-vdpa: introduce vhost-vdpa backend |
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Date: |
Wed, 3 Jun 2020 13:23:16 +0800 |
Hi Jason,
On Wed, Jun 3, 2020 at 10:52 AM Jason Wang <jasowang@redhat.com> wrote:
>
>
> On 2020/5/29 下午10:06, Cindy Lu wrote:
> > From: Tiwei Bie <tiwei.bie@intel.com>
> >
> > Currently we have 2 types of vhost backends in QEMU: vhost kernel and
> > vhost-user. The above patch provides a generic device for vDPA purpose,
> > this vDPA device exposes to user space a non-vendor-specific configuration
> > interface for setting up a vhost HW accelerator, this patch set introduces
> > a third vhost backend called vhost-vdpa based on the vDPA interface.
> >
> > Vhost-vdpa usage:
> >
> > qemu-system-x86_64 -cpu host -enable-kvm \
> > ......
> > -netdev type=vhost-vdpa,vhostdev=/dev/vhost-vdpa-id,id=vhost-vdpa0 \
> > -device virtio-net-pci,netdev=vhost-vdpa0,page-per-vq=on \
> >
> > Co-Authored-By: Lingshan zhu <lingshan.zhu@intel.com>
> > Signed-off-by: Cindy Lu <lulu@redhat.com>
> > ---
> > configure | 21 ++
> > hw/net/vhost_net-stub.c | 5 +
> > hw/net/vhost_net.c | 47 +++-
> > hw/virtio/Makefile.objs | 1 +
> > hw/virtio/vhost-backend.c | 5 +
> > hw/virtio/vhost-vdpa.c | 399 ++++++++++++++++++++++++++++++
> > hw/virtio/vhost.c | 37 ++-
> > include/hw/virtio/vhost-backend.h | 10 +-
> > include/hw/virtio/vhost-vdpa.h | 26 ++
> > include/hw/virtio/vhost.h | 2 +
> > include/net/vhost_net.h | 4 +-
> > qemu-options.hx | 15 ++
> > 12 files changed, 566 insertions(+), 6 deletions(-)
> > create mode 100644 hw/virtio/vhost-vdpa.c
> > create mode 100644 include/hw/virtio/vhost-vdpa.h
> >
> > diff --git a/configure b/configure
> > index 23b5e93752..53679ee57f 100755
> > --- a/configure
> > +++ b/configure
> > @@ -1557,6 +1557,10 @@ for opt do
> > ;;
> > --enable-vhost-user) vhost_user="yes"
> > ;;
> > + --disable-vhost-vdpa) vhost_vdpa="no"
> > + ;;
> > + --enable-vhost-vdpa) vhost_vdpa="yes"
> > + ;;
> > --disable-vhost-kernel) vhost_kernel="no"
> > ;;
> > --enable-vhost-kernel) vhost_kernel="yes"
> > @@ -1846,6 +1850,7 @@ disabled with --disable-FEATURE, default is enabled
> > if available:
> > vhost-crypto vhost-user-crypto backend support
> > vhost-kernel vhost kernel backend support
> > vhost-user vhost-user backend support
> > + vhost-vdpa vhost-vdpa kernel backend support
> > spice spice
> > rbd rados block device (rbd)
> > libiscsi iscsi support
> > @@ -2336,6 +2341,10 @@ test "$vhost_user" = "" && vhost_user=yes
> > if test "$vhost_user" = "yes" && test "$mingw32" = "yes"; then
> > error_exit "vhost-user isn't available on win32"
> > fi
> > +test "$vhost_vdpa" = "" && vhost_vdpa=$linux
> > +if test "$vhost_vdpa" = "yes" && test "$linux" != "yes"; then
> > + error_exit "vhost-vdpa is only available on Linux"
> > +fi
> > test "$vhost_kernel" = "" && vhost_kernel=$linux
> > if test "$vhost_kernel" = "yes" && test "$linux" != "yes"; then
> > error_exit "vhost-kernel is only available on Linux"
> > @@ -2364,6 +2373,11 @@ test "$vhost_user_fs" = "" &&
> > vhost_user_fs=$vhost_user
> > if test "$vhost_user_fs" = "yes" && test "$vhost_user" = "no"; then
> > error_exit "--enable-vhost-user-fs requires --enable-vhost-user"
> > fi
> > +#vhost-vdpa backends
> > +test "$vhost_net_vdpa" = "" && vhost_net_vdpa=$vhost_vdpa
> > +if test "$vhost_net_vdpa" = "yes" && test "$vhost_vdpa" = "no"; then
> > + error_exit "--enable-vhost-net-vdpa requires --enable-vhost-vdpa"
> > +fi
> >
> > # OR the vhost-kernel and vhost-user values for simplicity
> > if test "$vhost_net" = ""; then
> > @@ -6673,6 +6687,7 @@ echo "vhost-scsi support $vhost_scsi"
> > echo "vhost-vsock support $vhost_vsock"
> > echo "vhost-user support $vhost_user"
> > echo "vhost-user-fs support $vhost_user_fs"
> > +echo "vhost-vdpa support $vhost_vdpa"
> > echo "Trace backends $trace_backends"
> > if have_backend "simple"; then
> > echo "Trace output file $trace_file-<pid>"
> > @@ -7170,6 +7185,9 @@ fi
> > if test "$vhost_net_user" = "yes" ; then
> > echo "CONFIG_VHOST_NET_USER=y" >> $config_host_mak
> > fi
> > +if test "$vhost_net_vdpa" = "yes" ; then
> > + echo "CONFIG_VHOST_NET_VDPA=y" >> $config_host_mak
> > +fi
> > if test "$vhost_crypto" = "yes" ; then
> > echo "CONFIG_VHOST_CRYPTO=y" >> $config_host_mak
> > fi
> > @@ -7182,6 +7200,9 @@ fi
> > if test "$vhost_user" = "yes" ; then
> > echo "CONFIG_VHOST_USER=y" >> $config_host_mak
> > fi
> > +if test "$vhost_vdpa" = "yes" ; then
> > + echo "CONFIG_VHOST_VDPA=y" >> $config_host_mak
> > +fi
> > if test "$vhost_user_fs" = "yes" ; then
> > echo "CONFIG_VHOST_USER_FS=y" >> $config_host_mak
> > fi
> > diff --git a/hw/net/vhost_net-stub.c b/hw/net/vhost_net-stub.c
> > index 43e93e1a9a..ab77a92a7d 100644
> > --- a/hw/net/vhost_net-stub.c
> > +++ b/hw/net/vhost_net-stub.c
> > @@ -94,3 +94,8 @@ int vhost_net_set_mtu(struct vhost_net *net, uint16_t mtu)
> > {
> > return 0;
> > }
> > +int vhost_net_get_device_id(struct vhost_net *net, uint32_t * device_id)
> > +{
> > + return 0;
> > +}
> > +
> > diff --git a/hw/net/vhost_net.c b/hw/net/vhost_net.c
> > index e2bc7de2eb..25045cff59 100644
> > --- a/hw/net/vhost_net.c
> > +++ b/hw/net/vhost_net.c
> > @@ -17,8 +17,10 @@
> > #include "net/net.h"
> > #include "net/tap.h"
> > #include "net/vhost-user.h"
> > +#include "net/vhost-vdpa.h"
> >
> > #include "standard-headers/linux/vhost_types.h"
> > +#include "linux-headers/linux/vhost.h"
> > #include "hw/virtio/virtio-net.h"
> > #include "net/vhost_net.h"
> > #include "qemu/error-report.h"
> > @@ -85,6 +87,30 @@ static const int user_feature_bits[] = {
> > VHOST_INVALID_FEATURE_BIT
> > };
> >
> > +static const int vdpa_feature_bits[] = {
> > + VIRTIO_F_NOTIFY_ON_EMPTY,
> > + VIRTIO_RING_F_INDIRECT_DESC,
> > + VIRTIO_RING_F_EVENT_IDX,
> > + VIRTIO_F_ANY_LAYOUT,
> > + VIRTIO_F_VERSION_1,
> > + VIRTIO_NET_F_CSUM,
> > + VIRTIO_NET_F_GUEST_CSUM,
> > + VIRTIO_NET_F_GSO,
> > + VIRTIO_NET_F_GUEST_TSO4,
> > + VIRTIO_NET_F_GUEST_TSO6,
> > + VIRTIO_NET_F_GUEST_ECN,
> > + VIRTIO_NET_F_GUEST_UFO,
> > + VIRTIO_NET_F_HOST_TSO4,
> > + VIRTIO_NET_F_HOST_TSO6,
> > + VIRTIO_NET_F_HOST_ECN,
> > + VIRTIO_NET_F_HOST_UFO,
> > + VIRTIO_NET_F_MRG_RXBUF,
> > + VIRTIO_NET_F_MTU,
> > + VIRTIO_F_IOMMU_PLATFORM,
> > + VIRTIO_F_RING_PACKED,
> > + VIRTIO_NET_F_GUEST_ANNOUNCE,
> > + VHOST_INVALID_FEATURE_BIT
> > +};
>
>
> I think those feature bits should belong to net/vhost-vdpa.c, since it
> contains bits that are net specific.
>
Sure will move these.
>
> > static const int *vhost_net_get_feature_bits(struct vhost_net *net)
> > {
> > const int *feature_bits = 0;
> > @@ -96,6 +122,9 @@ static const int *vhost_net_get_feature_bits(struct
> > vhost_net *net)
> > case NET_CLIENT_DRIVER_VHOST_USER:
> > feature_bits = user_feature_bits;
> > break;
> > + case NET_CLIENT_DRIVER_VHOST_VDPA:
> > + feature_bits = vdpa_feature_bits;
> > + break;
> > default:
> > error_report("Feature bits not defined for this type: %d",
> > net->nc->info->type);
> > @@ -110,7 +139,10 @@ uint64_t vhost_net_get_features(struct vhost_net *net,
> > uint64_t features)
> > return vhost_get_features(&net->dev, vhost_net_get_feature_bits(net),
> > features);
> > }
> > -
> > +int vhost_net_get_device_id(struct vhost_net *net, uint32_t * device_id)
> > +{
> > + return vhost_dev_get_device_id(&net->dev, device_id);
> > +}
> > void vhost_net_ack_features(struct vhost_net *net, uint64_t features)
> > {
> > net->dev.acked_features = net->dev.backend_features;
> > @@ -337,6 +369,11 @@ int vhost_net_start(VirtIODevice *dev, NetClientState
> > *ncs,
> > }
> >
> > for (i = 0; i < total_queues; i++) {
> > +
> > + if (virtio_queue_enabled(dev, i)) {
> > + vhost_set_vring_ready(peer);
> > + }
>
>
> So this may break vpda_sim since it call set_vq_ready() before
> set_vring_addr.
>
> I think maybe it's better not introduce vhost_set_vring_ready() but
> enable virtqueue in vhost_vdpa_set_state() before setting DRIVER_OK.
>
>
will fix this
> > +
> > peer = qemu_get_peer(ncs, i);
> > r = vhost_net_start_one(get_vhost_net(peer), dev);
> >
> > @@ -433,6 +470,12 @@ VHostNetState *get_vhost_net(NetClientState *nc)
> > vhost_net = vhost_user_get_vhost_net(nc);
> > assert(vhost_net);
> > break;
> > +#endif
> > +#ifdef CONFIG_VHOST_NET_VDPA
> > + case NET_CLIENT_DRIVER_VHOST_VDPA:
> > + vhost_net = vhost_vdpa_get_vhost_net(nc);
> > + assert(vhost_net);
> > + break;
> > #endif
> > default:
> > break;
> > @@ -474,3 +517,5 @@ int vhost_net_set_mtu(struct vhost_net *net, uint16_t
> > mtu)
> >
> > return vhost_ops->vhost_net_set_mtu(&net->dev, mtu);
> > }
> > +
> > +
>
>
> One extra newline.
>
will fix this
>
> > diff --git a/hw/virtio/Makefile.objs b/hw/virtio/Makefile.objs
> > index 4e4d39a0a4..6b1b1a5fce 100644
> > --- a/hw/virtio/Makefile.objs
> > +++ b/hw/virtio/Makefile.objs
> > @@ -5,6 +5,7 @@ obj-y += virtio.o
> > obj-$(CONFIG_VHOST) += vhost.o vhost-backend.o
> > common-obj-$(call lnot,$(CONFIG_VHOST)) += vhost-stub.o
> > obj-$(CONFIG_VHOST_USER) += vhost-user.o
> > +obj-$(CONFIG_VHOST_VDPA) += vhost-vdpa.o
> >
> > common-obj-$(CONFIG_VIRTIO_RNG) += virtio-rng.o
> > common-obj-$(CONFIG_VIRTIO_PCI) += virtio-pci.o
> > diff --git a/hw/virtio/vhost-backend.c b/hw/virtio/vhost-backend.c
> > index 42efb4967b..420341e8c5 100644
> > --- a/hw/virtio/vhost-backend.c
> > +++ b/hw/virtio/vhost-backend.c
> > @@ -291,6 +291,11 @@ int vhost_set_backend_type(struct vhost_dev *dev,
> > VhostBackendType backend_type)
> > case VHOST_BACKEND_TYPE_USER:
> > dev->vhost_ops = &user_ops;
> > break;
> > +#endif
> > +#ifdef CONFIG_VHOST_VDPA
> > + case VHOST_BACKEND_TYPE_VDPA:
> > + dev->vhost_ops = &vdpa_ops;
> > + break;
> > #endif
> > default:
> > error_report("Unknown vhost backend type");
> > diff --git a/hw/virtio/vhost-vdpa.c b/hw/virtio/vhost-vdpa.c
> > new file mode 100644
> > index 0000000000..2d136a8565
> > --- /dev/null
> > +++ b/hw/virtio/vhost-vdpa.c
> > @@ -0,0 +1,399 @@
> > +/*
> > + * vhost-vdpa
> > + *
> > + * Copyright(c) 2017-2018 Intel Corporation.
> > + * Copyright(c) 2020 Red Hat, Inc.
> > + *
> > + * This work is licensed under the terms of the GNU GPL, version 2 or
> > later.
> > + * See the COPYING file in the top-level directory.
> > + *
> > + */
> > +
> > +#include "qemu/osdep.h"
> > +#include <linux/vhost.h>
> > +#include <linux/vfio.h>
> > +#include <sys/eventfd.h>
> > +#include <sys/ioctl.h>
> > +#include "hw/virtio/vhost.h"
> > +#include "hw/virtio/vhost-backend.h"
> > +#include "hw/virtio/virtio-net.h"
> > +#include "hw/virtio/vhost-vdpa.h"
> > +#include "qemu/main-loop.h"
> > +#include <linux/kvm.h>
> > +#include "sysemu/kvm.h"
> > +
> > +
> > +static bool vhost_vdpa_listener_skipped_section(MemoryRegionSection
> > *section)
> > +{
> > + return (!memory_region_is_ram(section->mr) &&
> > + !memory_region_is_iommu(section->mr)) ||
> > + /*
> > + * Sizing an enabled 64-bit BAR can cause spurious mappings to
> > + * addresses in the upper part of the 64-bit address space.
> > These
> > + * are never accessed by the CPU and beyond the address width of
> > + * some IOMMU hardware. TODO: VDPA should tell us the IOMMU
> > width.
> > + */
> > + section->offset_within_address_space & (1ULL << 63);
> > +}
> > +
> > +static int vhost_vdpa_dma_map(struct vhost_vdpa *v, hwaddr iova, hwaddr
> > size,
> > + void *vaddr, bool readonly)
> > +{
> > + struct vhost_msg_v2 msg;
> > + int fd = v->device_fd;
> > + int ret = 0;
> > +
> > + msg.type = v->msg_type;
> > + msg.iotlb.iova = iova;
> > + msg.iotlb.size = size;
> > + msg.iotlb.uaddr = (uint64_t)vaddr;
> > + msg.iotlb.perm = readonly ? VHOST_ACCESS_RO : VHOST_ACCESS_RW;
> > + msg.iotlb.type = VHOST_IOTLB_UPDATE;
> > +
> > + if (write(fd, &msg, sizeof(msg)) != sizeof(msg)) {
> > + error_report("failed to write, fd=%d, errno=%d (%s)",
> > + fd, errno, strerror(errno));
> > + return -EIO ;
> > + }
> > +
> > + return ret;
> > +}
> > +
> > +static int vhost_vdpa_dma_unmap(struct vhost_vdpa *v, hwaddr iova,
> > + hwaddr size)
> > +{
> > + struct vhost_msg_v2 msg;
> > + int fd = v->device_fd;
> > + int ret = 0;
> > +
> > + msg.type = v->msg_type;
> > + msg.iotlb.iova = iova;
> > + msg.iotlb.size = size;
> > + msg.iotlb.type = VHOST_IOTLB_INVALIDATE;
> > +
> > + if (write(fd, &msg, sizeof(msg)) != sizeof(msg)) {
> > + error_report("failed to write, fd=%d, errno=%d (%s)",
> > + fd, errno, strerror(errno));
> > + return -EIO ;
> > + }
> > +
> > + return ret;
> > +}
> > +
> > +static void vhost_vdpa_listener_region_add(MemoryListener *listener,
> > + MemoryRegionSection *section)
> > +{
> > + struct vhost_vdpa *v = container_of(listener, struct vhost_vdpa,
> > listener);
> > + hwaddr iova;
> > + Int128 llend, llsize;
> > + void *vaddr;
> > + int ret;
> > +
> > + if (vhost_vdpa_listener_skipped_section(section)) {
> > + return;
> > + }
> > +
> > + if (unlikely((section->offset_within_address_space &
> > ~TARGET_PAGE_MASK) !=
> > + (section->offset_within_region & ~TARGET_PAGE_MASK))) {
> > + error_report("%s received unaligned region", __func__);
> > + return;
> > + }
> > +
> > + iova = TARGET_PAGE_ALIGN(section->offset_within_address_space);
> > + llend = int128_make64(section->offset_within_address_space);
> > + llend = int128_add(llend, section->size);
> > + llend = int128_and(llend, int128_exts64(TARGET_PAGE_MASK));
> > +
> > + if (int128_ge(int128_make64(iova), llend)) {
> > + return;
> > + }
> > +
> > + memory_region_ref(section->mr);
> > +
> > + /* Here we assume that memory_region_is_ram(section->mr)==true */
> > +
> > + vaddr = memory_region_get_ram_ptr(section->mr) +
> > + section->offset_within_region +
> > + (iova - section->offset_within_address_space);
> > +
> > + llsize = int128_sub(llend, int128_make64(iova));
> > +
> > + ret = vhost_vdpa_dma_map(v, iova, int128_get64(llsize),
> > + vaddr, section->readonly);
> > + if (ret) {
> > + error_report("vhost vdpa map fail!");
> > + if (memory_region_is_ram_device(section->mr)) {
> > + /* Allow unexpected mappings not to be fatal for RAM devices */
> > + error_report("map ram fail!");
> > + return ;
> > + }
> > + goto fail;
> > + }
> > +
> > + return;
> > +
> > +fail:
> > + if (memory_region_is_ram_device(section->mr)) {
> > + error_report("failed to vdpa_dma_map. pci p2p may not work");
> > + return;
> > +
> > + }
> > + /*
> > + * On the initfn path, store the first error in the container so we
> > + * can gracefully fail. Runtime, there's not much we can do other
> > + * than throw a hardware error.
> > + */
> > + error_report("vhost-vdpa: DMA mapping failed, unable to continue");
> > + return;
> > +
> > +}
> > +
> > +static void vhost_vdpa_listener_region_del(MemoryListener *listener,
> > + MemoryRegionSection *section)
> > +{
> > + struct vhost_vdpa *v = container_of(listener, struct vhost_vdpa,
> > listener);
> > + hwaddr iova;
> > + Int128 llend, llsize;
> > + int ret;
> > + bool try_unmap = true;
> > +
> > + if (vhost_vdpa_listener_skipped_section(section)) {
> > + return;
> > + }
> > +
> > + if (unlikely((section->offset_within_address_space &
> > ~TARGET_PAGE_MASK) !=
> > + (section->offset_within_region & ~TARGET_PAGE_MASK))) {
> > + error_report("%s received unaligned region", __func__);
> > + return;
> > + }
> > +
> > + iova = TARGET_PAGE_ALIGN(section->offset_within_address_space);
> > + llend = int128_make64(section->offset_within_address_space);
> > + llend = int128_add(llend, section->size);
> > + llend = int128_and(llend, int128_exts64(TARGET_PAGE_MASK));
> > +
> > + if (int128_ge(int128_make64(iova), llend)) {
> > + return;
> > + }
> > +
> > + llsize = int128_sub(llend, int128_make64(iova));
> > +
> > + if (try_unmap) {
> > + ret = vhost_vdpa_dma_unmap(v, iova, int128_get64(llsize));
> > + if (ret) {
> > + error_report("vhost_vdpa dma unmap error!");
> > + }
> > + }
> > +
> > + memory_region_unref(section->mr);
> > +}
>
>
> newline is needed here.
>
will fix this
>
> > +/* Register a new memory listener, only to get diffs from qemu,
> > + * this help to reduce the tricky codes in vhost
> > + * (e.g generating diffs of two rbtree as usnic did).*/
>
>
> This comment needs some improvement. How about:
>
> /* IOTLB API is used by vhost-vpda which requires incremental updating
> of the mapping. So we can not use generic vhost memory listener which
> depends on the addnop(). */
>
>
> > +static const MemoryListener vhost_vdpa_memory_listener = {
> > + .region_add = vhost_vdpa_listener_region_add,
> > + .region_del = vhost_vdpa_listener_region_del,
> > +};
> > +
> > +static int vhost_vdpa_call(struct vhost_dev *dev, unsigned long int
> > request,
> > + void *arg)
> > +{
> > + struct vhost_vdpa *v = dev->opaque;
> > + int fd = v->device_fd;
> > +
> > + assert(dev->vhost_ops->backend_type == VHOST_BACKEND_TYPE_VDPA);
> > +
> > + return ioctl(fd, request, arg);
> > +}
> > +
> > +static void vhost_vdpa_add_status(struct vhost_dev *dev, uint8_t status)
> > +{
> > + uint8_t s;
> > +
> > + if (vhost_vdpa_call(dev, VHOST_VDPA_GET_STATUS, &s)) {
> > + return;
> > + }
> > +
> > + s |= status;
> > +
> > + vhost_vdpa_call(dev, VHOST_VDPA_SET_STATUS, &s);
> > +}
> > +
> > +static int vhost_vdpa_init(struct vhost_dev *dev, void *opaque)
> > +{
> > + struct vhost_vdpa *v;
> > +
> > + assert(dev->vhost_ops->backend_type == VHOST_BACKEND_TYPE_VDPA);
> > +
> > + v = opaque;
> > + dev->opaque = opaque ;
> > +
> > + v->listener = vhost_vdpa_memory_listener;
> > + v->msg_type = VHOST_IOTLB_MSG_V2;
> > + memory_listener_register(&v->listener, &address_space_memory);
>
>
> Let's move the memory listener register/unregister to
> vhost_vdpa_set_state(). Then we can avoid lots of unnecessary vhost
> IOTLB transactions before DRIVER_OK which vhost-vDPA doesn't care.
>
>
sure will move this
> > +
> > + vhost_vdpa_add_status(dev, VIRTIO_CONFIG_S_ACKNOWLEDGE |
> > + VIRTIO_CONFIG_S_DRIVER);
> > +
> > + return 0;
> > +}
> > +
> > +static int vhost_vdpa_cleanup(struct vhost_dev *dev)
> > +{
> > + struct vhost_vdpa *v;
> > + assert(dev->vhost_ops->backend_type == VHOST_BACKEND_TYPE_VDPA);
> > +
> > + v = dev->opaque;
> > + memory_listener_unregister(&v->listener);
> > +
> > + dev->opaque = NULL;
> > + return 0;
> > +}
> > +
> > +static int vhost_vdpa_memslots_limit(struct vhost_dev *dev)
> > +{
> > + return INT_MAX;
> > +}
> > +
> > +static int vhost_vdpa_set_mem_table(struct vhost_dev *dev,
> > + struct vhost_memory *mem)
> > +{
> > +
> > + if (mem->padding) {
> > + return -1;
> > + }
> > +
> > + return 0;
> > +}
> > +
> > +static int vhost_vdpa_set_features(struct vhost_dev *dev,
> > + uint64_t features)
> > +{
> > + int ret = vhost_vdpa_call(dev, VHOST_SET_FEATURES, &features);
> > + uint8_t status = 0;
> > +
> > + if (ret) {
> > + return ret;
> > + }
> > + vhost_vdpa_add_status(dev, VIRTIO_CONFIG_S_FEATURES_OK);
> > + vhost_vdpa_call(dev, VHOST_VDPA_GET_STATUS, &status);
> > +
> > + return !(status & VIRTIO_CONFIG_S_FEATURES_OK);
> > +}
> > +
> > +int vhost_vdpa_get_device_id(struct vhost_dev *dev,
> > + uint32_t *device_id)
> > +{
> > + return vhost_vdpa_call(dev, VHOST_VDPA_GET_DEVICE_ID, device_id);
> > +}
> > +
> > +static int vhost_vdpa_reset_device(struct vhost_dev *dev)
> > +{
> > + uint8_t status = 0;
> > +
> > + return vhost_vdpa_call(dev, VHOST_VDPA_SET_STATUS, &status);
> > +}
> > +
> > +static int vhost_vdpa_get_vq_index(struct vhost_dev *dev, int idx)
> > +{
> > + assert(idx >= dev->vq_index && idx < dev->vq_index + dev->nvqs);
> > +
> > + return idx - dev->vq_index;
> > +}
> > +
> > +static int vhost_vdpa_set_vring_ready(struct vhost_dev *dev)
> > +{
> > + int i;
> > + for (i = 0; i < dev->nvqs; ++i) {
> > + struct vhost_vring_state state = {
> > + .index = dev->vq_index + i,
> > + .num = 1,
> > + };
> > + vhost_vdpa_call(dev, VHOST_VDPA_SET_VRING_ENABLE, &state);
> > + }
> > + return 0;
> > +}
> > +
> > +static int vhost_vdpa_set_config(struct vhost_dev *dev, const uint8_t
> > *data,
> > + uint32_t offset, uint32_t size,
> > + uint32_t flags)
> > +{
> > + struct vhost_vdpa_config config;
> > + int ret;
> > + if ((size > VHOST_VDPA_MAX_CONFIG_SIZE) || (data == NULL)) {
> > + return -1;
> > + }
> > + memset(&config, 0, sizeof(struct vhost_vdpa_config));
> > + config.off = 0;
> > + config.len = size;
> > + memcpy(&config.buf, data, size);
> > + ret = vhost_vdpa_call(dev, VHOST_VDPA_SET_CONFIG, &config);
> > + return ret;
> > +}
> > +
> > +static int vhost_vdpa_get_config(struct vhost_dev *dev, uint8_t *config,
> > + uint32_t config_len)
> > +{
> > + struct vhost_vdpa_config v_config;
> > + int ret;
> > +
> > + memset(&v_config, 0, sizeof(struct vhost_vdpa_config));
> > + if (config == NULL) {
> > + return -1;
> > + }
> > + ret = vhost_vdpa_call(dev, VHOST_VDPA_GET_CONFIG, &v_config);
> > + if ((v_config.len > config_len) || (v_config.len == 0)) {
> > + return -EINVAL;
> > + }
> > + memcpy(config, &v_config.buf, config_len);
> > + return ret;
> > + }
> > +
> > +static int vhost_vdpa_set_state(struct vhost_dev *dev, bool started)
>
>
> We probably need a better name, e.g vhost_vdpa_start()?
>
>
will fix this
> > +{
> > + if (started) {
> > + uint8_t status = 0;
> > +
> > + vhost_vdpa_add_status(dev, VIRTIO_CONFIG_S_DRIVER_OK);
> > + vhost_vdpa_call(dev, VHOST_VDPA_GET_STATUS, &status);
> > +
> > + return !(status & VIRTIO_CONFIG_S_DRIVER_OK);
> > + } else {
> > + vhost_vdpa_reset_device(dev);
> > + vhost_vdpa_add_status(dev, VIRTIO_CONFIG_S_ACKNOWLEDGE |
> > + VIRTIO_CONFIG_S_DRIVER);
> > + return 0;
> > + }
> > +}
> > +
> > +const VhostOps vdpa_ops = {
> > + .backend_type = VHOST_BACKEND_TYPE_VDPA,
> > + .vhost_backend_init = vhost_vdpa_init,
> > + .vhost_backend_cleanup = vhost_vdpa_cleanup,
> > + .vhost_set_log_base = vhost_kernel_set_log_base,
> > + .vhost_set_vring_addr = vhost_kernel_set_vring_addr,
> > + .vhost_set_vring_num = vhost_kernel_set_vring_num,
> > + .vhost_set_vring_base = vhost_kernel_set_vring_base,
> > + .vhost_get_vring_base = vhost_kernel_get_vring_base,
> > + .vhost_set_vring_kick = vhost_kernel_set_vring_kick,
> > + .vhost_set_vring_call = vhost_kernel_set_vring_call,
> > + .vhost_get_features = vhost_kernel_get_features,
> > + .vhost_set_owner = vhost_kernel_set_owner,
> > + .vhost_set_vring_endian = NULL,
> > + .vhost_backend_memslots_limit = vhost_vdpa_memslots_limit,
> > + .vhost_set_mem_table = vhost_vdpa_set_mem_table,
> > + .vhost_set_features = vhost_vdpa_set_features,
> > + .vhost_reset_device = vhost_vdpa_reset_device,
> > + .vhost_get_vq_index = vhost_vdpa_get_vq_index,
> > + .vhost_set_vring_ready = vhost_vdpa_set_vring_ready,
> > + .vhost_get_config = vhost_vdpa_get_config,
> > + .vhost_set_config = vhost_vdpa_set_config,
> > + .vhost_requires_shm_log = NULL,
> > + .vhost_migration_done = NULL,
> > + .vhost_backend_can_merge = NULL,
> > + .vhost_net_set_mtu = NULL,
> > + .vhost_set_iotlb_callback = NULL,
> > + .vhost_send_device_iotlb_msg = NULL,
> > + .vhost_set_state = vhost_vdpa_set_state,
>
>
> Since it only accept boolean parameter I guess vhost_dev_start() is better?
>
will fix this
>
> > + .vhost_get_device_id = vhost_vdpa_get_device_id,
> > +};
> > diff --git a/hw/virtio/vhost.c b/hw/virtio/vhost.c
> > index 01ebe12f28..b97aa02a4c 100644
> > --- a/hw/virtio/vhost.c
> > +++ b/hw/virtio/vhost.c
> > @@ -756,6 +756,12 @@ static int vhost_virtqueue_set_addr(struct vhost_dev
> > *dev,
> > .log_guest_addr = vq->used_phys,
> > .flags = enable_log ? (1 << VHOST_VRING_F_LOG) : 0,
> > };
> > + /*vDPA need to use the phys address here to set to hardware*/
>
>
> Actually it's "IOVA" instead of "phys address".
>
>
> > + if (dev->vhost_ops->backend_type == VHOST_BACKEND_TYPE_VDPA) {
> > + addr.desc_user_addr = (uint64_t)(unsigned long)vq->desc_phys;
> > + addr.avail_user_addr = (uint64_t)(unsigned long)vq->avail_phys;
> > + addr.used_user_addr = (uint64_t)(unsigned long)vq->used_phys;
> > + }
>
>
> Let's introduce a callback here instead of such hard-coded ones.
>
will fix this
>
> > int r = dev->vhost_ops->vhost_set_vring_addr(dev, &addr);
> > if (r < 0) {
> > VHOST_OPS_DEBUG("vhost_set_vring_addr failed");
> > @@ -1506,6 +1512,14 @@ int vhost_dev_set_config(struct vhost_dev *hdev,
> > const uint8_t *data,
> > return -1;
> > }
> >
> > +int vhost_dev_get_device_id(struct vhost_dev *hdev, uint32_t *device_id)
> > +{
> > + assert(hdev->vhost_ops);
> > + if (hdev->vhost_ops->vhost_get_device_id) {
> > + return hdev->vhost_ops->vhost_get_device_id(hdev, device_id);
> > + }
> > + return -1;
> > +}
> > void vhost_dev_set_config_notifier(struct vhost_dev *hdev,
> > const VhostDevConfigOps *ops)
> > {
> > @@ -1661,7 +1675,13 @@ int vhost_dev_start(struct vhost_dev *hdev,
> > VirtIODevice *vdev)
> > }
> > }
> >
> > - if (vhost_dev_has_iommu(hdev)) {
> > + r = vhost_set_state(hdev, true);
> > + if (r) {
> > + goto fail_log;
> > + }
>
>
> Please use a separate patch for introducing vhost_set_state().
>
will fix this
>
> > +
> > + if (vhost_dev_has_iommu(hdev) &&
> > + hdev->vhost_ops->vhost_set_iotlb_callback) {
>
>
> A new patch for checking vhost_set_iotlb_callback(), or just implement
> it for vhost-vpda that just warn about IOTLB miss.
>
>
> > hdev->vhost_ops->vhost_set_iotlb_callback(hdev, true);
> >
> > /* Update used ring information for IOTLB to work correctly,
> > @@ -1697,6 +1717,8 @@ void vhost_dev_stop(struct vhost_dev *hdev,
> > VirtIODevice *vdev)
> > /* should only be called after backend is connected */
> > assert(hdev->vhost_ops);
> >
> > + vhost_set_state(hdev, false);
> > +
> > for (i = 0; i < hdev->nvqs; ++i) {
> > vhost_virtqueue_stop(hdev,
> > vdev,
> > @@ -1705,7 +1727,9 @@ void vhost_dev_stop(struct vhost_dev *hdev,
> > VirtIODevice *vdev)
> > }
> >
> > if (vhost_dev_has_iommu(hdev)) {
> > - hdev->vhost_ops->vhost_set_iotlb_callback(hdev, false);
> > + if (hdev->vhost_ops->vhost_set_iotlb_callback) {
> > + hdev->vhost_ops->vhost_set_iotlb_callback(hdev, false);
> > + }
> > memory_listener_unregister(&hdev->iommu_listener);
> > }
> > vhost_log_put(hdev, true);
> > @@ -1722,3 +1746,12 @@ int vhost_net_set_backend(struct vhost_dev *hdev,
> >
> > return -1;
> > }
> > +
> > +int vhost_set_state(struct vhost_dev *hdev, bool started)
> > +{
> > + if (hdev->vhost_ops->vhost_set_state) {
> > + return hdev->vhost_ops->vhost_set_state(hdev, started);
> > + }
> > +
> > + return 0;
> > +}
> > diff --git a/include/hw/virtio/vhost-backend.h
> > b/include/hw/virtio/vhost-backend.h
> > index 300b59c172..1ebe3785cf 100644
> > --- a/include/hw/virtio/vhost-backend.h
> > +++ b/include/hw/virtio/vhost-backend.h
> > @@ -17,7 +17,8 @@ typedef enum VhostBackendType {
> > VHOST_BACKEND_TYPE_NONE = 0,
> > VHOST_BACKEND_TYPE_KERNEL = 1,
> > VHOST_BACKEND_TYPE_USER = 2,
> > - VHOST_BACKEND_TYPE_MAX = 3,
> > + VHOST_BACKEND_TYPE_VDPA = 3,
> > + VHOST_BACKEND_TYPE_MAX = 4,
> > } VhostBackendType;
> >
> > typedef enum VhostSetConfigType {
> > @@ -77,6 +78,7 @@ typedef int (*vhost_reset_device_op)(struct vhost_dev
> > *dev);
> > typedef int (*vhost_get_vq_index_op)(struct vhost_dev *dev, int idx);
> > typedef int (*vhost_set_vring_enable_op)(struct vhost_dev *dev,
> > int enable);
> > +typedef int (*vhost_set_vring_ready_op)(struct vhost_dev *dev);
> > typedef bool (*vhost_requires_shm_log_op)(struct vhost_dev *dev);
> > typedef int (*vhost_migration_done_op)(struct vhost_dev *dev,
> > char *mac_addr);
> > @@ -112,6 +114,8 @@ typedef int (*vhost_get_inflight_fd_op)(struct
> > vhost_dev *dev,
> > typedef int (*vhost_set_inflight_fd_op)(struct vhost_dev *dev,
> > struct vhost_inflight *inflight);
> >
> > +typedef int (*vhost_set_state_op)(struct vhost_dev *dev, bool started);
> > +typedef int (*vhost_get_device_id_op)(struct vhost_dev *dev, uint32_t
> > *dev_id);
> > typedef struct VhostOps {
> > VhostBackendType backend_type;
> > vhost_backend_init vhost_backend_init;
> > @@ -138,6 +142,7 @@ typedef struct VhostOps {
> > vhost_reset_device_op vhost_reset_device;
> > vhost_get_vq_index_op vhost_get_vq_index;
> > vhost_set_vring_enable_op vhost_set_vring_enable;
> > + vhost_set_vring_ready_op vhost_set_vring_ready;
> > vhost_requires_shm_log_op vhost_requires_shm_log;
> > vhost_migration_done_op vhost_migration_done;
> > vhost_backend_can_merge_op vhost_backend_can_merge;
> > @@ -152,9 +157,12 @@ typedef struct VhostOps {
> > vhost_backend_mem_section_filter_op vhost_backend_mem_section_filter;
> > vhost_get_inflight_fd_op vhost_get_inflight_fd;
> > vhost_set_inflight_fd_op vhost_set_inflight_fd;
> > + vhost_set_state_op vhost_set_state;
> > + vhost_get_device_id_op vhost_get_device_id;
> > } VhostOps;
> >
> > extern const VhostOps user_ops;
> > +extern const VhostOps vdpa_ops;
> >
> > int vhost_set_backend_type(struct vhost_dev *dev,
> > VhostBackendType backend_type);
> > diff --git a/include/hw/virtio/vhost-vdpa.h b/include/hw/virtio/vhost-vdpa.h
> > new file mode 100644
> > index 0000000000..6455663388
> > --- /dev/null
> > +++ b/include/hw/virtio/vhost-vdpa.h
> > @@ -0,0 +1,26 @@
> > +/*
> > + * vhost-vdpa.h
> > + *
> > + * Copyright(c) 2017-2018 Intel Corporation.
> > + * Copyright(c) 2020 Red Hat, Inc.
> > + *
> > + * This work is licensed under the terms of the GNU GPL, version 2 or
> > later.
> > + * See the COPYING file in the top-level directory.
> > + *
> > + */
> > +
> > +#ifndef HW_VIRTIO_VHOST_VDPA_H
> > +#define HW_VIRTIO_VHOST_VDPA_H
> > +
> > +#include "hw/virtio/virtio.h"
> > +
> > +typedef struct vhost_vdpa {
> > + int device_fd;
> > + uint32_t msg_type;
> > + MemoryListener listener;
> > +} VhostVDPA;
> > +
> > +extern AddressSpace address_space_memory;
> > +extern int vhost_vdpa_get_device_id(struct vhost_dev *dev,
> > + uint32_t *device_id);
> > +#endif
> > diff --git a/include/hw/virtio/vhost.h b/include/hw/virtio/vhost.h
> > index 085450c6f8..b682545f51 100644
> > --- a/include/hw/virtio/vhost.h
> > +++ b/include/hw/virtio/vhost.h
> > @@ -124,6 +124,7 @@ int vhost_dev_get_config(struct vhost_dev *dev, uint8_t
> > *config,
> > uint32_t config_len);
> > int vhost_dev_set_config(struct vhost_dev *dev, const uint8_t *data,
> > uint32_t offset, uint32_t size, uint32_t flags);
> > +int vhost_dev_get_device_id(struct vhost_dev *hdev, uint32_t *device_id);
> > /* notifier callback in case vhost device config space changed
> > */
> > void vhost_dev_set_config_notifier(struct vhost_dev *dev,
> > @@ -137,4 +138,5 @@ int vhost_dev_set_inflight(struct vhost_dev *dev,
> > struct vhost_inflight *inflight);
> > int vhost_dev_get_inflight(struct vhost_dev *dev, uint16_t queue_size,
> > struct vhost_inflight *inflight);
> > +int vhost_set_state(struct vhost_dev *dev, bool started);
> > #endif
> > diff --git a/include/net/vhost_net.h b/include/net/vhost_net.h
> > index 8a6f208189..56e67fe164 100644
> > --- a/include/net/vhost_net.h
> > +++ b/include/net/vhost_net.h
> > @@ -40,5 +40,5 @@ int vhost_set_vring_ready(NetClientState *nc);
> > uint64_t vhost_net_get_acked_features(VHostNetState *net);
> >
> > int vhost_net_set_mtu(struct vhost_net *net, uint16_t mtu);
> > -
> > -#endif
> > +int vhost_net_get_device_id(struct vhost_net *net, uint32_t *device_id);
>
>
> This should belong to vhost-vdpa header.
>
> Thanks
>
will fix this
>
> > +endif
> > diff --git a/qemu-options.hx b/qemu-options.hx
> > index 292d4e7c0c..c19e10ce9c 100644
> > --- a/qemu-options.hx
> > +++ b/qemu-options.hx
> > @@ -2409,6 +2409,10 @@ DEF("netdev", HAS_ARG, QEMU_OPTION_netdev,
> > #ifdef CONFIG_POSIX
> > "-netdev vhost-user,id=str,chardev=dev[,vhostforce=on|off]\n"
> > " configure a vhost-user network, backed by a chardev
> > 'dev'\n"
> > +#endif
> > +#ifdef CONFIG_POSIX
> > + "-netdev vhost-vdpa,id=str,vhostdev=/path/to/dev\n"
> > + " configure a vhost-vdpa network,Establish a vhost-vdpa
> > netdev\n"
> > #endif
> > "-netdev hubport,id=str,hubid=n[,netdev=nd]\n"
> > " configure a hub port on the hub with ID 'n'\n",
> > QEMU_ARCH_ALL)
> > @@ -2428,6 +2432,9 @@ DEF("nic", HAS_ARG, QEMU_OPTION_nic,
> > #endif
> > #ifdef CONFIG_POSIX
> > "vhost-user|"
> > +#endif
> > +#ifdef CONFIG_POSIX
> > + "vhost-vdpa|"
> > #endif
> > "socket][,option][,...][mac=macaddr]\n"
> > " initialize an on-board / default host NIC (using MAC
> > address\n"
> > @@ -2896,6 +2903,14 @@ SRST
> > hubport to another netdev with ID nd by using the ``netdev=nd``
> > option.
> >
> > +``-netdev vhost-vdpa,vhostdev=/path/to/dev ``
> > + Establish a vhost-vdpa netdev.
> > +
> > + vDPA device is a device that uses a datapath which complies with
> > + the virtio specifications with a vendor specific control path.
> > + vDPA devices can be both physically located on the hardware or
> > + emulated by software.
> > +
> > ``-net nic[,netdev=nd][,macaddr=mac][,model=type]
> > [,name=name][,addr=addr][,vectors=v]``
> > Legacy option to configure or create an on-board (or machine
> > default) Network Interface Card(NIC) and connect it either to the
>