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Nov 2021 21:25:58 -0700 (PDT) Subject: Re: [RFC PATCH v5 00/26] vDPA shadow virtqueue To: =?UTF-8?Q?Eugenio_P=c3=a9rez?= , qemu-devel@nongnu.org References: <20211029183525.1776416-1-eperezma@redhat.com> From: Jason Wang Message-ID: <24da75d6-edcd-5cb9-f51e-c3e5ce55dcd4@redhat.com> Date: Tue, 2 Nov 2021 12:25:45 +0800 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:78.0) Gecko/20100101 Thunderbird/78.14.0 MIME-Version: 1.0 In-Reply-To: <20211029183525.1776416-1-eperezma@redhat.com> Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=jasowang@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 8bit Content-Language: en-US Received-SPF: pass client-ip=170.10.133.124; envelope-from=jasowang@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -46 X-Spam_score: -4.7 X-Spam_bar: ---- X-Spam_report: (-4.7 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.734, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, NICE_REPLY_A=-1.14, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H2=-0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Laurent Vivier , Parav Pandit , "Michael S. Tsirkin" , Juan Quintela , Richard Henderson , Stefan Hajnoczi , Peter Xu , Markus Armbruster , Harpreet Singh Anand , Xiao W Wang , Eli Cohen , Paolo Bonzini , Stefano Garzarella , Eric Blake , virtualization@lists.linux-foundation.org, Eduardo Habkost Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" 在 2021/10/30 上午2:34, Eugenio Pérez 写道: > This series enable shadow virtqueue (SVQ) for vhost-vdpa devices. This > is intended as a new method of tracking the memory the devices touch > during a migration process: Instead of relay on vhost device's dirty > logging capability, SVQ intercepts the VQ dataplane forwarding the > descriptors between VM and device. This way qemu is the effective > writer of guests memory, like in qemu's virtio device operation. > > When SVQ is enabled qemu offers a new virtual address space to the > device to read and write into, and it maps new vrings and the guest > memory in it. SVQ also intercepts kicks and calls between the device > and the guest. Used buffers relay would cause dirty memory being > tracked, but at this RFC SVQ is not enabled on migration automatically. > > Thanks of being a buffers relay system, SVQ can be used also to > communicate devices and drivers with different capabilities, like > devices that only supports packed vring and not split and old guest > with no driver packed support. > > It is based on the ideas of DPDK SW assisted LM, in the series of > DPDK's https://patchwork.dpdk.org/cover/48370/ . However, these does > not map the shadow vq in guest's VA, but in qemu's. > > For qemu to use shadow virtqueues the guest virtio driver must not use > features like event_idx. > > SVQ needs to be enabled with QMP command: > > { "execute": "x-vhost-set-shadow-vq", > "arguments": { "name": "vhost-vdpa0", "enable": true } } > > This series includes some patches to delete in the final version that > helps with its testing. The first two of the series have been sent > sepparately but they haven't been included in qemu main branch. > > The two after them adds the feature to stop the device and be able to > set and get its status. It's intended to be used with vp_vpda driver in > a nested environment, so they are also external to this series. The > vp_vdpa driver also need modifications to forward the new status bit, > they will be proposed sepparately > > Patches 5-12 prepares the SVQ and QMP command to support guest to host > notifications forwarding. If the SVQ is enabled with these ones > applied and the device supports it, that part can be tested in > isolation (for example, with networking), hopping through SVQ. > > Same thing is true with patches 13-17, but with device to guest > notifications. > > Based on them, patches from 18 to 22 implement the actual buffer > forwarding, using some features already introduced in previous. > However, they will need a host device with no iommu, something that > is not available at the moment. > > The last part of the series uses properly the host iommu, so the driver > can access this new virtual address space created. > > Comments are welcome. I think we need do some benchmark to see the performance impact. Thanks > > TODO: > * Event, indirect, packed, and others features of virtio. > * To sepparate buffers forwarding in its own AIO context, so we can > throw more threads to that task and we don't need to stop the main > event loop. > * Support multiqueue virtio-net vdpa. > * Proper documentation. > > Changes from v4 RFC: > * Support of allocating / freeing iova ranges in IOVA tree. Extending > already present iova-tree for that. > * Proper validation of guest features. Now SVQ can negotiate a > different set of features with the device when enabled. > * Support of host notifiers memory regions > * Handling of SVQ full queue in case guest's descriptors span to > different memory regions (qemu's VA chunks). > * Flush pending used buffers at end of SVQ operation. > * QMP command now looks by NetClientState name. Other devices will need > to implement it's way to enable vdpa. > * Rename QMP command to set, so it looks more like a way of working > * Better use of qemu error system > * Make a few assertions proper error-handling paths. > * Add more documentation > * Less coupling of virtio / vhost, that could cause friction on changes > * Addressed many other small comments and small fixes. > > Changes from v3 RFC: > * Move everything to vhost-vdpa backend. A big change, this allowed > some cleanup but more code has been added in other places. > * More use of glib utilities, especially to manage memory. > v3 link: > https://lists.nongnu.org/archive/html/qemu-devel/2021-05/msg06032.html > > Changes from v2 RFC: > * Adding vhost-vdpa devices support > * Fixed some memory leaks pointed by different comments > v2 link: > https://lists.nongnu.org/archive/html/qemu-devel/2021-03/msg05600.html > > Changes from v1 RFC: > * Use QMP instead of migration to start SVQ mode. > * Only accepting IOMMU devices, closer behavior with target devices > (vDPA) > * Fix invalid masking/unmasking of vhost call fd. > * Use of proper methods for synchronization. > * No need to modify VirtIO device code, all of the changes are > contained in vhost code. > * Delete superfluous code. > * An intermediate RFC was sent with only the notifications forwarding > changes. It can be seen in > https://patchew.org/QEMU/20210129205415.876290-1-eperezma@redhat.com/ > v1 link: > https://lists.gnu.org/archive/html/qemu-devel/2020-11/msg05372.html > > Eugenio Pérez (20): > virtio: Add VIRTIO_F_QUEUE_STATE > virtio-net: Honor VIRTIO_CONFIG_S_DEVICE_STOPPED > virtio: Add virtio_queue_is_host_notifier_enabled > vhost: Make vhost_virtqueue_{start,stop} public > vhost: Add x-vhost-enable-shadow-vq qmp > vhost: Add VhostShadowVirtqueue > vdpa: Register vdpa devices in a list > vhost: Route guest->host notification through shadow virtqueue > Add vhost_svq_get_svq_call_notifier > Add vhost_svq_set_guest_call_notifier > vdpa: Save call_fd in vhost-vdpa > vhost-vdpa: Take into account SVQ in vhost_vdpa_set_vring_call > vhost: Route host->guest notification through shadow virtqueue > virtio: Add vhost_shadow_vq_get_vring_addr > vdpa: Save host and guest features > vhost: Add vhost_svq_valid_device_features to shadow vq > vhost: Shadow virtqueue buffers forwarding > vhost: Add VhostIOVATree > vhost: Use a tree to store memory mappings > vdpa: Add custom IOTLB translations to SVQ > > Eugenio Pérez (26): > util: Make some iova_tree parameters const > vhost: Fix last queue index of devices with no cvq > virtio: Add VIRTIO_F_QUEUE_STATE > virtio-net: Honor VIRTIO_CONFIG_S_DEVICE_STOPPED > vhost: Add x-vhost-set-shadow-vq qmp > vhost: Add VhostShadowVirtqueue > vdpa: Save kick_fd in vhost-vdpa > vdpa: Add vhost_svq_get_dev_kick_notifier > vdpa: Add vhost_svq_set_svq_kick_fd > vhost: Add Shadow VirtQueue kick forwarding capabilities > vhost: Handle host notifiers in SVQ > vhost: Route guest->host notification through shadow virtqueue > Add vhost_svq_get_svq_call_notifier > Add vhost_svq_set_guest_call_notifier > vdpa: Save call_fd in vhost-vdpa > vhost-vdpa: Take into account SVQ in vhost_vdpa_set_vring_call > vhost: Route host->guest notification through shadow virtqueue > virtio: Add vhost_shadow_vq_get_vring_addr > vdpa: ack VIRTIO_F_QUEUE_STATE if device supports it > vhost: Add vhost_svq_valid_device_features to shadow vq > vhost: Add vhost_svq_valid_guest_features to shadow vq > vhost: Shadow virtqueue buffers forwarding > util: Add iova_tree_alloc > vhost: Add VhostIOVATree > vhost: Use a tree to store memory mappings > vdpa: Add custom IOTLB translations to SVQ > > qapi/net.json | 20 + > hw/virtio/vhost-iova-tree.h | 27 + > hw/virtio/vhost-shadow-virtqueue.h | 44 ++ > hw/virtio/virtio-pci.h | 1 + > include/hw/virtio/vhost-vdpa.h | 12 + > include/hw/virtio/virtio.h | 4 +- > include/qemu/iova-tree.h | 25 +- > .../standard-headers/linux/virtio_config.h | 5 + > include/standard-headers/linux/virtio_pci.h | 2 + > hw/i386/intel_iommu.c | 2 +- > hw/net/vhost_net.c | 2 +- > hw/net/virtio-net.c | 6 +- > hw/virtio/vhost-iova-tree.c | 157 ++++ > hw/virtio/vhost-shadow-virtqueue.c | 746 ++++++++++++++++++ > hw/virtio/vhost-vdpa.c | 437 +++++++++- > hw/virtio/virtio-pci.c | 16 +- > net/vhost-vdpa.c | 28 + > util/iova-tree.c | 151 +++- > hw/virtio/meson.build | 2 +- > 19 files changed, 1664 insertions(+), 23 deletions(-) > create mode 100644 hw/virtio/vhost-iova-tree.h > create mode 100644 hw/virtio/vhost-shadow-virtqueue.h > create mode 100644 hw/virtio/vhost-iova-tree.c > create mode 100644 hw/virtio/vhost-shadow-virtqueue.c >