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2020-07-07vhost-vdpa: introduce vhost-vdpa backendCindy Lu
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 \ Signed-off-by: Lingshan zhu <lingshan.zhu@intel.com> Signed-off-by: Tiwei Bie <tiwei.bie@intel.com> Signed-off-by: Cindy Lu <lulu@redhat.com> Signed-off-by: Jason Wang <jasowang@redhat.com> Message-Id: <20200701145538.22333-14-lulu@redhat.com> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Acked-by: Jason Wang <jasowang@redhat.com>
2020-07-03vhost_net: introduce set_config & get_configCindy Lu
This patch introduces set_config & get_config method which allows vhost_net set/get the config to backend Signed-off-by: Cindy Lu <lulu@redhat.com> Message-Id: <20200701145538.22333-13-lulu@redhat.com> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Acked-by: Jason Wang <jasowang@redhat.com>
2020-07-03vhost_net: use the function qemu_get_peerCindy Lu
user the qemu_get_peer to replace the old process Signed-off-by: Cindy Lu <lulu@redhat.com> Reviewed-by: Laurent Vivier <lvivier@redhat.com> Message-Id: <20200701145538.22333-3-lulu@redhat.com> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Acked-by: Jason Wang <jasowang@redhat.com>
2019-10-25vhost_net: enable packed ring supportJason Wang
Signed-off-by: Jason Wang <jasowang@redhat.com> Signed-off-by: Eugenio Pérez <eperezma@redhat.com> Reviewed-by: Jens Freimann <jfreimann@redhat.com> Message-Id: <20191025083527.30803-8-eperezma@redhat.com> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
2019-08-16Include qemu/main-loop.h lessMarkus Armbruster
In my "build everything" tree, changing qemu/main-loop.h triggers a recompile of some 5600 out of 6600 objects (not counting tests and objects that don't depend on qemu/osdep.h). It includes block/aio.h, which in turn includes qemu/event_notifier.h, qemu/notify.h, qemu/processor.h, qemu/qsp.h, qemu/queue.h, qemu/thread-posix.h, qemu/thread.h, qemu/timer.h, and a few more. Include qemu/main-loop.h only where it's needed. Touching it now recompiles only some 1700 objects. For block/aio.h and qemu/event_notifier.h, these numbers drop from 5600 to 2800. For the others, they shrink only slightly. Signed-off-by: Markus Armbruster <armbru@redhat.com> Message-Id: <20190812052359.30071-21-armbru@redhat.com> Reviewed-by: Alex Bennée <alex.bennee@linaro.org> Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com> Tested-by: Philippe Mathieu-Daudé <philmd@redhat.com>
2019-05-17vhost_net: don't set backend for the uninitialized virtqueueJason Wang
We used to set backend unconditionally, this won't work for some guests (e.g windows driver) who may not initialize all virtqueues. For kernel backend, this will fail since it may try to validate the rings during setting backend. Fixing this by simply skipping the backend set when we find desc is not ready. Reviewed-by: Michael S. Tsirkin<mst@redhat.com> Signed-off-by: Jason Wang <jasowang@redhat.com>
2019-02-21vhost-net: compile it on all targets that have virtio-net.Paolo Bonzini
This shows a preexisting bug: if a KVM target did not have virtio-net enabled, it would fail with undefined symbols when vhost was enabled. This must now be fixed, lest targets that have no virtio-net fail to compile. Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Reviewed-by: Thomas Huth <thuth@redhat.com> Message-Id: <1543851204-41186-5-git-send-email-pbonzini@redhat.com> Message-Id: <1550165756-21617-6-git-send-email-pbonzini@redhat.com> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
2019-02-21vhost: restrict Linux dependency to kernel vhostPaolo Bonzini
vhost-user does not depend on Linux; it can run on any POSIX system. Restrict vhost-kernel to Linux in hw/virtio/vhost-backend.c, everything else can be compiled on all POSIX systems. Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com> Reviewed-by: Thomas Huth <thuth@redhat.com> Message-Id: <1543851204-41186-4-git-send-email-pbonzini@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Message-Id: <1550165756-21617-4-git-send-email-pbonzini@redhat.com> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
2019-02-21vhost-net-user: add stubs for when no virtio-net device is presentPaolo Bonzini
hw/net/vhost_net.c needs functions that are declared in net/vhost-user.c: the vhost-user code is always compiled into QEMU, only the constructor net_init_vhost_user is unreachable. Also, net/vhost-user.c needs functions declared in hw/virtio/vhost-stub.c even if no virtio device exists. Break this dependency. First, add a minimal version of net/vhost-user.c, with no functionality and no dependency on vhost code. Second, #ifdef out the calls back to net/vhost-user.c from hw/net/vhost_net.c. While at it, this patch fixes the CONFIG_VHOST_NET_USE*D* typo. Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com> Message-Id: <1543851204-41186-3-git-send-email-pbonzini@redhat.com> Reviewed-by: Thomas Huth <thuth@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Message-Id: <1550165756-21617-3-git-send-email-pbonzini@redhat.com> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
2019-02-21vhost-net: move stubs to a separate filePaolo Bonzini
There is no reason for CONFIG_VHOST_NET to be specific to a single target; it is a host feature that can be add to all targets, as long as they support the virtio-net device. Currently CONFIG_VHOST_NET depends on CONFIG_KVM, but ioeventfd support is present in the core memory API and works with other accelerators as well. As a first step, move the vhost-net stubs to a separate file. Later, they will become conditional on CONFIG_VIRTIO_NET, which is not available in .c files. Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com> Reviewed-by: Thomas Huth <thuth@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Message-Id: <1543851204-41186-2-git-send-email-pbonzini@redhat.com> Message-Id: <1550165756-21617-2-git-send-email-pbonzini@redhat.com> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
2017-06-02spec/vhost-user spec: Add IOMMU supportMaxime Coquelin
This patch specifies and implements the master/slave communication to support device IOTLB in slave. The vhost_iotlb_msg structure introduced for kernel backends is re-used, making the design close between the two backends. An exception is the use of the secondary channel to enable the slave to send IOTLB miss requests to the master. Signed-off-by: Maxime Coquelin <maxime.coquelin@redhat.com> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
2017-01-18vhost_net: device IOTLB supportJason Wang
This patches implements Device IOTLB support for vhost kernel. This is done through: 1) switch to use dma helpers when map/unmap vrings from vhost codes 2) introduce a set of VhostOps to: - setting up device IOTLB request callback - processing device IOTLB request - processing device IOTLB invalidation 2) kernel support for Device IOTLB API: - allow vhost-net to query the IOMMU IOTLB entry through eventfd - enable the ability for qemu to update a specified mapping of vhost - through ioctl. - enable the ability to invalidate a specified range of iova for the device IOTLB of vhost through ioctl. In x86/intel_iommu case this is triggered through iommu memory region notifier from device IOTLB invalidation descriptor processing routine. With all the above, kernel vhost_net can co-operate with userspace IOMMU. For vhost-user, the support could be easily done on top by implementing the VhostOps. Cc: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Jason Wang <jasowang@redhat.com> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
2017-01-10vhost-net: Notify the backend about the host MTUMaxime Coquelin
This patch provides a way for virtio-net to notify the backend about the host MTU set by the user. Cc: Michael S. Tsirkin <mst@redhat.com> Cc: Aaron Conole <aconole@redhat.com> Signed-off-by: Maxime Coquelin <maxime.coquelin@redhat.com> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
2016-08-10vhost: check for vhost_ops before using.Ilya Maximets
'vhost_set_vring_enable()' tries to call function using pointer to 'vhost_ops' which can be already zeroized in 'vhost_dev_cleanup()' while vhost disconnection. Fix that by checking 'vhost_ops' before using. This fixes QEMU crash on calling 'ethtool -L eth0 combined 2' if vhost disconnected. Signed-off-by: Ilya Maximets <i.maximets@samsung.com> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
2016-07-29vhost: add vhost_net_set_backend()Marc-André Lureau
Not all vhost-user backends support ops->vhost_net_set_backend(). It is a nicer to provide an assert/error than to crash trying to call. Furthermore, it improves a bit the code by hiding vhost_ops details. Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
2016-07-29vhost-net: vhost_migration_done is vhost-user specificMarc-André Lureau
Either the callback is mandatory to implement, in which case an assert() is more appropriate, or it's not and we can't tell much whether the function should fail or not (given it's name, I guess it should silently success by default). Instead, make the implementation mandatory and vhost-user specific to be more clear about its usage. Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
2016-07-29Revert "vhost-net: do not crash if backend is not present"Marc-André Lureau
Now that get_vhost_net() returns non-null after a successful vhost_net_init(), we no longer need to check this case. This reverts commit ecd34898596c60f79886061618dd7e01001113ad. Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
2016-07-29vhost-user: add get_vhost_net() assertionsMarc-André Lureau
Add a few assertions to be more explicit about the runtime behaviour after the previous patch: get_vhost_net() is non-null after net_vhost_user_init(). Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
2016-07-29vhost-user: keep vhost_net after a disconnectionMarc-André Lureau
Many code paths assume get_vhost_net() returns non-null. Keep VhostUserState.vhost_net after a successful vhost_net_init(), instead of freeing it in vhost_net_cleanup(). VhostUserState.vhost_net is thus freed before after being recreated or on final vhost_user_cleanup() and there is no need to save the acked features. Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
2016-07-29vhost-net: always call vhost_dev_cleanup() on failureMarc-André Lureau
vhost_dev_init(), calling vhost backend initialization, should be cleaned up after failure too. Call vhost_dev_cleanup() in all failure cases. First, it needs to zero-alloc the struct to avoid the initial garbage. Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
2016-07-29misc: indentationMarc-André Lureau
Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
2016-07-19qapi: Change Netdev into a flat unionEric Blake
This is a mostly-mechanical conversion that creates a new flat union 'Netdev' QAPI type that covers all the branches of the former 'NetClientOptions' simple union, where the branches are now listed in a new 'NetClientDriver' enum rather than generated from the simple union. The existence of a flat union has no change to the command line syntax accepted for new code, and will make it possible for a future patch to switch the QMP command to parse a boxed union for no change to valid QMP; but it does have some ripple effect on the C code when dealing with the new types. While making the conversion, note that the 'NetLegacy' type remains unchanged: it applies only to legacy command line options, and will not be ported to QMP, so it should remain a wrapper around a simple union; to avoid confusion, the type named 'NetClientOptions' is now gone, and we introduce 'NetLegacyOptions' in its place. Then, in the C code, we convert from NetLegacy to Netdev as soon as possible, so that the bulk of the net stack only has to deal with one QAPI type, not two. Note that since the old legacy code always rejected 'hubport', we can just omit that branch from the new 'NetLegacyOptions' simple union. Based on an idea originally by Zoltán Kővágó <DirtY.iCE.hu@gmail.com>: Message-Id: <01a527fbf1a5de880091f98cf011616a78adeeee.1441627176.git.DirtY.iCE.hu@gmail.com> although the sed script in that patch no longer applies due to other changes in the tree since then, and I also did some manual cleanups (such as fixing whitespace to keep checkpatch happy). Signed-off-by: Eric Blake <eblake@redhat.com> Message-Id: <1468468228-27827-13-git-send-email-eblake@redhat.com> Reviewed-by: Markus Armbruster <armbru@redhat.com> [Fixup from Eric squashed in] Signed-off-by: Markus Armbruster <armbru@redhat.com>
2016-07-07tap: vhost busy polling supportJason Wang
This patch add the capability of basic vhost net busy polling which is supported by recent kernel. User could configure the maximum number of us that could be spent on busy polling through a new property of tap "poll-us". Cc: Greg Kurz <groug@kaod.org> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Jason Wang <jasowang@redhat.com>
2016-06-17vhost-net: save & restore vring enable stateMarc-André Lureau
A driver may change the vring enable state at run time but vhost-user backend may not be present (a contrived example is when the backend is disconnected and the device is reconfigured after driver rebinding) Restore the vring state when the vhost-user backend is started, so it can process the ring. Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com> Tested-by: Yuanhan Liu <yuanhan.liu@linux.intel.com> Reviewed-by: Yuanhan Liu <yuanhan.liu@linux.intel.com> Reviewed-by: Victor Kaplansky <victork@redhat.com> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
2016-06-17vhost-net: save & restore vhost-user acked featuresMarc-André Lureau
The initial vhost-user connection sets the features to be negotiated with the driver. Renegotiation isn't possible without device reset. To handle reconnection of vhost-user backend, ensure the same set of features are provided, and reuse already acked features. Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com> Tested-by: Yuanhan Liu <yuanhan.liu@linux.intel.com> Reviewed-by: Yuanhan Liu <yuanhan.liu@linux.intel.com> Reviewed-by: Victor Kaplansky <victork@redhat.com> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
2016-06-17vhost-net: do not crash if backend is not presentMarc-André Lureau
Do not crash when backend is not present while enabling the ring. A following patch will save the enabled state so it can be restored once the backend is started. Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com> Tested-by: Yuanhan Liu <yuanhan.liu@linux.intel.com> Reviewed-by: Yuanhan Liu <yuanhan.liu@linux.intel.com> Reviewed-by: Victor Kaplansky <victork@redhat.com> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
2016-02-18vhost-user interrupt management fixesVictor Kaplansky
Since guest_mask_notifier can not be used in vhost-user mode due to buffering implied by unix control socket, force use_mask_notifier on virtio devices of vhost-user interfaces, and send correct callfd to the guest at vhost start. Using guest_notifier_mask function in vhost-user case may break interrupt mask paradigm, because mask/unmask is not really done when returning from guest_notifier_mask call, instead message is posted in a unix socket, and processed later. Add an option boolean flag 'use_mask_notifier' to disable the use of guest_notifier_mask in virtio pci. Signed-off-by: Didier Pallard <didier.pallard@6wind.com> Signed-off-by: Victor Kaplansky <victork@redhat.com> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
2016-02-16vhost-net: revert support of cross-endian vnet headersGreg Kurz
Cross-endian is now handled by the core virtio-net code. This patch reverts: commit 5be7d9f1b1452613b95c6ba70b8d7ad3d0797991 vhost-net: tell tap backend about the vnet endianness and commit cf0a628f6e81bfc9b7a944fa0b80c3594836df56 net: set endianness on all backend devices Reviewed-by: Laurent Vivier <lvivier@redhat.com> Signed-off-by: Greg Kurz <gkurz@linux.vnet.ibm.com> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Reviewed-by: Laurent Vivier <lvivier@redhat.com>
2016-02-06net: set endianness on all backend devicesLaurent Vivier
commit 5be7d9f1b1452613b95c6ba70b8d7ad3d0797991 vhost-net: tell tap backend about the vnet endianness makes vhost net to set the endianness of the device, but only for the first device. In case of multiqueue, we have multiple devices... This patch sets the endianness for all the devices of the interface. Signed-off-by: Laurent Vivier <lvivier@redhat.com> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Reviewed-by: Greg Kurz <gkurz@linux.vnet.ibm.com> Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com> Reviewed-by: Jason Wang <jasowang@redhat.com>
2016-01-29hw/net: Clean up includesPeter Maydell
Clean up includes so that osdep.h is included first and headers which it implies are not included manually. This commit was created with scripts/clean-includes. Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Message-id: 1453832250-766-19-git-send-email-peter.maydell@linaro.org
2015-11-18vhost-user: ignore qemu-only featuresMichael S. Tsirkin
Some features (such as ctrl vq) are supported by qemu without need to communicate with the backend. Drop them from the feature mask so we set them unconditionally. Reported-by: Victor Kaplansky <vkaplans@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
2015-11-16vhost: don't send RESET_OWNER at stopYuanhan Liu
First of all, RESET_OWNER message is sent incorrectly, as it's sent before GET_VRING_BASE. And the reset message would let the later call get nothing correct. And, sending SET_VRING_ENABLE at stop, which has already been done, makes more sense than RESET_OWNER. Signed-off-by: Yuanhan Liu <yuanhan.liu@linux.intel.com> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
2015-10-22vhost user: add rarp sending after live migration for legacy guestThibaut Collet
A new vhost user message is added to allow QEMU to ask to vhost user backend to broadcast a fake RARP after live migration for guest without GUEST_ANNOUNCE capability. This new message is sent only if the backend supports the new VHOST_USER_PROTOCOL_F_RARP protocol feature. The payload of this new message is the MAC address of the guest (not known by the backend). The MAC address is copied in the first 6 bytes of a u64 to avoid to create a new payload message type. This new message has no equivalent ioctl so a new callback is added in the userOps structure to send the request. Upon reception of this new message the vhost user backend must generate and broadcast a fake RARP request to notify the migration is terminated. Signed-off-by: Thibaut Collet <thibaut.collet@6wind.com> [Rebased and fixed checkpatch errors - Marc-André] Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Tested-by: Thibaut Collet <thibaut.collet@6wind.com>
2015-10-22vhost user: add support of live migrationThibaut Collet
Some vhost user backends are able to support live migration. To provide this service the following features must be added: 1. Add the VIRTIO_NET_F_GUEST_ANNOUNCE capability to vhost-net when netdev backend is vhost-user. 2. Provide a nop receive callback to vhost-user. This callback is called by: * qemu_announce_self after a migration to send fake RARP to avoid network outage for peers talking to the migrated guest. - For guest with GUEST_ANNOUNCE capabilities, guest already sends GARP when the bit VIRTIO_NET_S_ANNOUNCE is set. => These packets must be discarded. - For guest without GUEST_ANNOUNCE capabilities, migration termination is notified when the guest sends packets. => These packets can be discarded. * virtio_net_tx_bh with a dummy boot to send fake bootp/dhcp request. BIOS guest manages virtio driver to send 4 bootp/dhcp request in case of dummy boot. => These packets must be discarded. Signed-off-by: Thibaut Collet <thibaut.collet@6wind.com> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Tested-by: Thibaut Collet <thibaut.collet@6wind.com>
2015-10-22vhost: use a function for each callMarc-André Lureau
Replace the generic vhost_call() by specific functions for each function call to help with type safety and changing arguments. While doing this, I found that "unsigned long long" and "uint64_t" were used interchangeably and causing compilation warnings, using uint64_t instead, as the vhost & protocol specifies. Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com> [Fix enum usage and MQ - Thibaut Collet] Signed-off-by: Thibaut Collet <thibaut.collet@6wind.com> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Tested-by: Thibaut Collet <thibaut.collet@6wind.com>
2015-09-24vhost-user: add a new message to disable/enable a specific virt queue.Changchun Ouyang
Add a new message, VHOST_USER_SET_VRING_ENABLE, to enable or disable a specific virt queue, which is similar to attach/detach queue for tap device. virtio driver on guest doesn't have to use max virt queue pair, it could enable any number of virt queue ranging from 1 to max virt queue pair. Signed-off-by: Changchun Ouyang <changchun.ouyang@intel.com> Signed-off-by: Yuanhan Liu <yuanhan.liu@linux.intel.com> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Yuanhan Liu <yuanhan.liu@linux.intel.com> Reviewed-by: Jason Wang <jasowang@redhat.com> Tested-by: Marcel Apfelbaum <marcel@redhat.com>
2015-09-24vhost-user: add multiple queue supportChangchun Ouyang
This patch is initially based a patch from Nikolay Nikolaev. This patch adds vhost-user multiple queue support, by creating a nc and vhost_net pair for each queue. Qemu exits if find that the backend can't support the number of requested queues (by providing queues=# option). The max number is queried by a new message, VHOST_USER_GET_QUEUE_NUM, and is sent only when protocol feature VHOST_USER_PROTOCOL_F_MQ is present first. The max queue check is done at vhost-user initiation stage. We initiate one queue first, which, in the meantime, also gets the max_queues the backend supports. In older version, it was reported that some messages are sent more times than necessary. Here we came an agreement with Michael that we could categorize vhost user messages to 2 types: non-vring specific messages, which should be sent only once, and vring specific messages, which should be sent per queue. Here I introduced a helper function vhost_user_one_time_request(), which lists following messages as non-vring specific messages: VHOST_USER_SET_OWNER VHOST_USER_RESET_DEVICE VHOST_USER_SET_MEM_TABLE VHOST_USER_GET_QUEUE_NUM For above messages, we simply ignore them when they are not sent the first time. Signed-off-by: Nikolay Nikolaev <n.nikolaev@virtualopensystems.com> Signed-off-by: Changchun Ouyang <changchun.ouyang@intel.com> Signed-off-by: Yuanhan Liu <yuanhan.liu@linux.intel.com> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Yuanhan Liu <yuanhan.liu@linux.intel.com> Reviewed-by: Jason Wang <jasowang@redhat.com> Tested-by: Marcel Apfelbaum <marcel@redhat.com>
2015-09-24vhost-user: add VHOST_USER_GET_QUEUE_NUM messageYuanhan Liu
This is for querying how many queues the backend supports if it has mq support(when VHOST_USER_PROTOCOL_F_MQ flag is set from the quried protocol features). vhost_net_get_max_queues() is the interface to export that value, and to tell if the backend supports # of queues user requested, which is done in the following patch. Signed-off-by: Yuanhan Liu <yuanhan.liu@linux.intel.com> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Yuanhan Liu <yuanhan.liu@linux.intel.com> Tested-by: Marcel Apfelbaum <marcel@redhat.com>
2015-09-24vhost: rename VHOST_RESET_OWNER to VHOST_RESET_DEVICEYuanhan Liu
Quote from Michael: We really should rename VHOST_RESET_OWNER to VHOST_RESET_DEVICE. Suggested-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Yuanhan Liu <yuanhan.liu@linux.intel.com> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Yuanhan Liu <yuanhan.liu@linux.intel.com> Reviewed-by: Marcel Apfelbaum <marcel@redhat.com> Tested-by: Marcel Apfelbaum <marcel@redhat.com>
2015-09-24vhost-user: add protocol feature negotiationMichael S. Tsirkin
Support a separate bitmask for vhost-user protocol features, and messages to get/set protocol features. Invoke them at init. No features are defined yet. [ leverage vhost_user_call for request handling -- Yuanhan Liu ] Signed-off-by: Michael S. Tsirkin <address@hidden> Signed-off-by: Yuanhan Liu <yuanhan.liu@linux.intel.com> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Yuanhan Liu <yuanhan.liu@linux.intel.com> Reviewed-by: Marcel Apfelbaum <marcel@redhat.com> Tested-by: Marcel Apfelbaum <marcel@redhat.com>
2015-09-10virtio: avoid leading underscores for helpersCornelia Huck
Commit ef546f1275f6563e8934dd5e338d29d9f9909ca6 ("virtio: add feature checking helpers") introduced a helper __virtio_has_feature. We don't want to use reserved identifiers, though, so let's rename __virtio_has_feature to virtio_has_feature and virtio_has_feature to virtio_vdev_has_feature. Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
2015-07-20Revert "vhost-user: add multi queue support"Michael S. Tsirkin
This reverts commit 830d70db692e374b55555f4407f96a1ceefdcc97. The interface isn't fully backwards-compatible, which is bad. Let's redo this properly after 2.4. Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
2015-06-19vhost: enable vhost without without MSI-XPankaj Gupta
We use vhostforce to enable vhost even if Guests don't have MSI-X support and we fall back to QEMU virtio-net. This gives a very small performance gain, but the disadvantage is that guest now controls which virtio code is running (qemu or vhost) so our attack surface is doubled. This patch will enable vhost unconditionally whenever it's requested. For compatibility, enable vhost when vhostforce is set, as well. Signed-off-by: Pankaj Gupta <pagupta@redhat.com> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Reviewed-by: Jason Wang <jasowang@redhat.com>
2015-06-19vhost_net: re-enable when cross endianCédric Le Goater
Cross-endianness is now checked by the core vhost code. revert 371df9f5e0f1 "vhost-net: disable when cross-endian" Signed-off-by: Cédric Le Goater <clg@fr.ibm.com> [ added commit message, Greg Kurz <gkurz@linux.vnet.ibm.com> ] Signed-off-by: Greg Kurz <gkurz@linux.vnet.ibm.com> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
2015-06-19vhost-net: tell tap backend about the vnet endiannessGreg Kurz
The default behaviour for TAP/MACVTAP is to consider vnet as native endian. This patch handles the cases when this is not true: - virtio 1.0: always little-endian - legacy cross-endian Signed-off-by: Greg Kurz <gkurz@linux.vnet.ibm.com> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
2015-06-10vhost: 64 bit featuresCornelia Huck
Make sure that all vhost interfaces use 64 bit features, as the virtio core does, and make sure to use ULL everywhere possible to be on the safe side. Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
2015-06-10vhost_net: add version_1 featureMichael S. Tsirkin
Add VERSION_1 to list of features that we should test at the backend. Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
2015-06-01vhost-user: add multi queue supportOuyang Changchun
Based on patch by Nikolay Nikolaev: Vhost-user will implement the multi queue support in a similar way to what vhost already has - a separate thread for each queue. To enable the multi queue functionality - a new command line parameter "queues" is introduced for the vhost-user netdev. Signed-off-by: Nikolay Nikolaev <n.nikolaev@virtualopensystems.com> Signed-off-by: Changchun Ouyang <changchun.ouyang@intel.com> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
2015-04-27vhost-user: Send VHOST_RESET_OWNER on vhost stopLuke Gorrie
Ensure that the vhost-user slave knows when the vrings are valid and when they are invalid, for example during a guest reboot. The vhost-user protocol says this of VHOST_RESET_OWNER: Issued when a new connection is about to be closed. The Master will no longer own this connection (and will usually close it). Send this message to tell the vhost-user slave that the vhost session has ended and that session state (e.g. vrings) is no longer valid. Signed-off-by: Luke Gorrie <luke@snabb.co> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
2015-03-10vhost_net: Add missing 'static' attributeStefan Weil
This fixes a warning from smatch. Signed-off-by: Stefan Weil <sw@weilnetz.de> Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
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