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2023-03-23vhost_task: Allow vhost layer to use copy_processMike Christie
Qemu will create vhost devices in the kernel which perform network, SCSI, etc IO and management operations from worker threads created by the kthread API. Because the kthread API does a copy_process on the kthreadd thread, the vhost layer has to use kthread_use_mm to access the Qemu thread's memory and cgroup_attach_task_all to add itself to the Qemu thread's cgroups, and it bypasses the RLIMIT_NPROC limit which can result in VMs creating more threads than the admin expected. This patch adds a new struct vhost_task which can be used instead of kthreads. They allow the vhost layer to use copy_process and inherit the userspace process's mm and cgroups, the task is accounted for under the userspace's nproc count and can be seen in its process tree, and other features like namespaces work and are inherited by default. Signed-off-by: Mike Christie <michael.christie@oracle.com> Acked-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Christian Brauner (Microsoft) <brauner@kernel.org> Signed-off-by: Christian Brauner <brauner@kernel.org>
2020-08-05vhost_vdpa: implement IRQ offloading in vhost_vdpaZhu Lingshan
This patch introduce a set of functions for setup/unsetup and update irq offloading respectively by register/unregister and re-register the irq_bypass_producer. With these functions, this commit can setup/unsetup irq offloading through setting DRIVER_OK/!DRIVER_OK, and update irq offloading through SET_VRING_CALL. Signed-off-by: Zhu Lingshan <lingshan.zhu@intel.com> Suggested-by: Jason Wang <jasowang@redhat.com> Link: https://lore.kernel.org/r/20200731065533.4144-5-lingshan.zhu@intel.com Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
2020-06-14treewide: replace '---help---' in Kconfig files with 'help'Masahiro Yamada
Since commit 84af7a6194e4 ("checkpatch: kconfig: prefer 'help' over '---help---'"), the number of '---help---' has been gradually decreasing, but there are still more than 2400 instances. This commit finishes the conversion. While I touched the lines, I also fixed the indentation. There are a variety of indentation styles found. a) 4 spaces + '---help---' b) 7 spaces + '---help---' c) 8 spaces + '---help---' d) 1 space + 1 tab + '---help---' e) 1 tab + '---help---' (correct indentation) f) 1 tab + 1 space + '---help---' g) 1 tab + 2 spaces + '---help---' In order to convert all of them to 1 tab + 'help', I ran the following commend: $ find . -name 'Kconfig*' | xargs sed -i 's/^[[:space:]]*---help---/\thelp/' Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
2020-06-02vhost: revert "vhost: disable for OABI"Michael S. Tsirkin
This reverts commit d085eb8ce727 ("vhost: disable for OABI") With commit "virtio: force spec specified alignment on types" in place, we force proper alignment for all structures, so there's no longer a reason to blacklist OABI. Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
2020-04-20vhost: disable for OABIMichael S. Tsirkin
vhost is currently broken on the some ARM configs. The reason is that the ring element addresses are passed between components with different alignments assumptions. Thus, if guest selects a pointer and host then gets and dereferences it, then alignment assumed by the host's compiler might be greater than the actual alignment of the pointer. compiler on the host from assuming pointer is aligned. This actually triggers on ARM with -mabi=apcs-gnu - which is a deprecated configuration. With this OABI, compiler assumes that all structures are 4 byte aligned - which is stronger than virtio guarantees for available and used rings, which are merely 2 bytes. Thus a guest without -mabi=apcs-gnu running on top of host with -mabi=apcs-gnu will be broken. The correct fix is to force alignment of structures - however that is an intrusive fix that's best deferred until the next release. We didn't previously support such ancient systems at all - this surfaced after vdpa support prompted removing dependency of vhost on VIRTULIZATION. So for now, let's just add something along the lines of depends on !ARM || AEABI to the virtio Kconfig declaration, and add a comment that it has to do with struct member alignment. Note: we can't make VHOST and VHOST_RING themselves have a dependency since these are selected. Add a new symbol for that. We should be able to drop this dependency down the road. Fixes: 20c384f1ea1a0bc7 ("vhost: refine vhost and vringh kconfig") Suggested-by: Ard Biesheuvel <ardb@kernel.org> Suggested-by: Richard Earnshaw <Richard.Earnshaw@arm.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
2020-04-17vdpa: make vhost, virtio depend on menuMichael S. Tsirkin
If user did not configure any vdpa drivers, neither vhost nor virtio vdpa are going to be useful. So there's no point in prompting for these and selecting vdpa core automatically. Simplify configuration by making virtio and vhost vdpa drivers depend on vdpa menu entry. Once done, we no longer need a separate menu entry, so also get rid of this. While at it, fix up the IFC entry: VDPA->vDPA for consistency with other places. Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Acked-by: Jason Wang <jasowang@redhat.com>
2020-04-16virtio/test: fix up after IOTLB changesMichael S. Tsirkin
Allow building vringh without IOTLB (that's the case for userspace builds, will be useful for CAIF/VOD down the road too). Update for API tweaks. Don't include vringh with userspace builds. Cc: Jason Wang <jasowang@redhat.com> Cc: Eugenio Pérez <eperezma@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Acked-by: Jason Wang <jasowang@redhat.com>
2020-04-02vhost: introduce vDPA-based backendTiwei Bie
This patch introduces a vDPA-based vhost backend. This backend is built on top of the same interface defined in virtio-vDPA and provides a generic vhost interface for userspace to accelerate the virtio devices in guest. This backend is implemented as a vDPA device driver on top of the same ops used in virtio-vDPA. It will create char device entry named vhost-vdpa-$index for userspace to use. Userspace can use vhost ioctls on top of this char device to setup the backend. Vhost ioctls are extended to make it type agnostic and behave like a virtio device, this help to eliminate type specific API like what vhost_net/scsi/vsock did: - VHOST_VDPA_GET_DEVICE_ID: get the virtio device ID which is defined by virtio specification to differ from different type of devices - VHOST_VDPA_GET_VRING_NUM: get the maximum size of virtqueue supported by the vDPA device - VHSOT_VDPA_SET/GET_STATUS: set and get virtio status of vDPA device - VHOST_VDPA_SET/GET_CONFIG: access virtio config space - VHOST_VDPA_SET_VRING_ENABLE: enable a specific virtqueue For memory mapping, IOTLB API is mandated for vhost-vDPA which means userspace drivers are required to use VHOST_IOTLB_UPDATE/VHOST_IOTLB_INVALIDATE to add or remove mapping for a specific userspace memory region. The vhost-vDPA API is designed to be type agnostic, but it allows net device only in current stage. Due to the lacking of control virtqueue support, some features were filter out by vhost-vdpa. We will enable more features and devices in the near future. Signed-off-by: Tiwei Bie <tiwei.bie@intel.com> Signed-off-by: Eugenio Pérez <eperezma@redhat.com> Signed-off-by: Jason Wang <jasowang@redhat.com> Link: https://lore.kernel.org/r/20200326140125.19794-8-jasowang@redhat.com Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
2020-04-01vringh: IOTLB supportJason Wang
This patch implements the third memory accessor for vringh besides current kernel and userspace accessors. This idea is to allow vringh to do the address translation through an IOTLB which is implemented via vhost_map interval tree. Users should setup and IOVA to PA mapping in this IOTLB. This allows us to: - Use vringh to access virtqueues with vIOMMU - Use vringh to implement software virtqueues for vDPA devices Signed-off-by: Jason Wang <jasowang@redhat.com> Link: https://lore.kernel.org/r/20200326140125.19794-5-jasowang@redhat.com Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
2020-04-01vhost: factor out IOTLBJason Wang
This patch factors out IOTLB into a dedicated module in order to be reused by other modules like vringh. User may choose to enable the automatic retiring by specifying VHOST_IOTLB_FLAG_RETIRE flag to fit for the case of vhost device IOTLB implementation. Signed-off-by: Jason Wang <jasowang@redhat.com> Link: https://lore.kernel.org/r/20200326140125.19794-4-jasowang@redhat.com Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
2020-04-01vhost: refine vhost and vringh kconfigJason Wang
Currently, CONFIG_VHOST depends on CONFIG_VIRTUALIZATION. But vhost is not necessarily for VM since it's a generic userspace and kernel communication protocol. Such dependency may prevent archs without virtualization support from using vhost. To solve this, a dedicated vhost menu is created under drivers so CONIFG_VHOST can be decoupled out of CONFIG_VIRTUALIZATION. While at it, also squash Kconfig.vringh into vhost Kconfig file. This avoids the trick of conditional inclusion from VOP or CAIF. Then it will be easier to introduce new vringh users and common dependency for both vringh and vhost. Signed-off-by: Jason Wang <jasowang@redhat.com> Link: https://lore.kernel.org/r/20200326140125.19794-2-jasowang@redhat.com Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
2019-05-21treewide: Add SPDX license identifier - Makefile/KconfigThomas Gleixner
Add SPDX license identifiers to all Make/Kconfig files which: - Have no license information of any form These files fall under the project license, GPL v2 only. The resulting SPDX license identifier is: GPL-2.0-only Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2018-08-22vhost: allow vhost-scsi driver to be built-inGreg Edwards
It's useful to allow vhost-scsi to be built-in when testing vhost in L1 + L2 VMs and booting L1 VM with QEMU '-kernel' option. Signed-off-by: Greg Edwards <gedwards@ddn.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
2017-02-11tap: tap as an independent moduleSainath Grandhi
This patch makes tap a separate module for other types of virtual interfaces, for example, ipvlan to use. Signed-off-by: Sainath Grandhi <sainath.grandhi@intel.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2016-08-02vhost: split out vringh KconfigMichael S. Tsirkin
vringh is pulled in by caif and mic, but the other vhost config does not need to be there. In particular, it makes no sense to have vhost net/scsi/sock under caif/mic. Create a separate Kconfig file and put vringh bits there. Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
2016-08-02VSOCK: Add Makefile and KconfigAsias He
Enable virtio-vsock and vhost-vsock. Signed-off-by: Asias He <asias@redhat.com> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
2016-08-02vhost: drop vringh dependencyMichael S. Tsirkin
vringh isn't used by vhost net or scsi - it's used by CAIF only at the moment. Drop the dependency. Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
2015-06-01vhost: cross-endian support for legacy devicesGreg Kurz
This patch brings cross-endian support to vhost when used to implement legacy virtio devices. Since it is a relatively rare situation, the feature availability is controlled by a kernel config option (not set by default). The vq->is_le boolean field is added to cache the endianness to be used for ring accesses. It defaults to native endian, as expected by legacy virtio devices. When the ring gets active, we force little endian if the device is modern. When the ring is deactivated, we revert to the native endian default. If cross-endian was compiled in, a vq->user_be boolean field is added so that userspace may request a specific endianness. This field is used to override the default when activating the ring of a legacy device. It has no effect on modern devices. Signed-off-by: Greg Kurz <gkurz@linux.vnet.ibm.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com> Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
2013-07-07vhost: Make vhost a separate moduleAsias He
Currently, vhost-net and vhost-scsi are sharing the vhost core code. However, vhost-scsi shares the code by including the vhost.c file directly. Making vhost a separate module makes it is easier to share code with other vhost devices. Signed-off-by: Asias He <asias@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
2013-05-02Merge tag 'virtio-next-for-linus' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux Pull virtio & lguest updates from Rusty Russell: "Lots of virtio work which wasn't quite ready for last merge window. Plus I dived into lguest again, reworking the pagetable code so we can move the switcher page: our fixmaps sometimes take more than 2MB now..." Ugh. Annoying conflicts with the tcm_vhost -> vhost_scsi rename. Hopefully correctly resolved. * tag 'virtio-next-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux: (57 commits) caif_virtio: Remove bouncing email addresses lguest: improve code readability in lg_cpu_start. virtio-net: fill only rx queues which are being used lguest: map Switcher below fixmap. lguest: cache last cpu we ran on. lguest: map Switcher text whenever we allocate a new pagetable. lguest: don't share Switcher PTE pages between guests. lguest: expost switcher_pages array (as lg_switcher_pages). lguest: extract shadow PTE walking / allocating. lguest: make check_gpte et. al return bool. lguest: assume Switcher text is a single page. lguest: rename switcher_page to switcher_pages. lguest: remove RESERVE_MEM constant. lguest: check vaddr not pgd for Switcher protection. lguest: prepare to make SWITCHER_ADDR a variable. virtio: console: replace EMFILE with EBUSY for already-open port virtio-scsi: reset virtqueue affinity when doing cpu hotplug virtio-scsi: introduce multiqueue support virtio-scsi: push vq lock/unlock into virtscsi_vq_done virtio-scsi: pass struct virtio_scsi to virtqueue completion function ...
2013-05-02vhost_scsi: module renameMichael S. Tsirkin
Rename module and update Kconfig and Makefile. Add alias for compatibility with old userspace scripts if any. Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Reviewed-by: Asias He <asias@redhat.com> Acked-by: Nicholas Bellinger <nab@linux-iscsi.org>
2013-03-20vringh: host-side implementation of virtio rings.Rusty Russell
Getting use of virtio rings correct is tricky, and a recent patch saw an implementation of in-kernel rings (as separate from userspace). This abstracts the business of dealing with the virtio ring layout from the access (userspace or direct); to do this, we use function pointers, which gcc inlines correctly. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> Acked-by: Michael S. Tsirkin <mst@redhat.com>
2013-01-21drivers/vhost: remove depends on CONFIG_EXPERIMENTALKees Cook
The CONFIG_EXPERIMENTAL config item has not carried much meaning for a while now and is almost always enabled by default. As agreed during the Linux kernel summit, remove it from any "depends on" lines in Kconfigs. Acked-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Kees Cook <keescook@chromium.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2012-07-29tcm_vhost: Initial merge for vhost level target fabric driverNicholas Bellinger
This patch adds the initial code for tcm_vhost, a Vhost level TCM fabric driver for virtio SCSI initiators into KVM guest. This code is currently up and running on v3.5-rc2 host+guest from target-pending/for-next-merge. Using tcm_vhost requires Zhi's -> Stefan -> nab's qemu vhost-scsi tree here: http://git.kernel.org/?p=virt/kvm/nab/qemu-kvm.git;a=shortlog;h=refs/heads/vhost-scsi -- Changelog v4 -> v5: Expose ABI version via VHOST_SCSI_GET_ABI_VERSION + use Rev 0 as starting point for v3.6-rc code (Stefan + ALiguori + nab) Convert vhost_scsi_handle_vq() to vq_err() (nab + MST) Minor style fixes from checkpatch (nab) Changelog v3 -> v4: Rename vhost_vring_target -> vhost_scsi_target (mst + nab) Use TRANSPORT_IQN_LEN in vhost_scsi_target->vhost_wwpn[] def (nab) Move back to drivers/vhost/, and just use drivers/vhost/Kconfig.tcm (mst) Move TCM_VHOST related ioctl defines from include/linux/vhost.h -> drivers/vhost/tcm_vhost.h as requested by MST (nab) Move Kbuild.tcm include from drivers/staging -> drivers/vhost/, and just use 'if STAGING' around 'source drivers/vhost/Kbuild.tcm' Changelog v2 -> v3: Unlock on error in tcm_vhost_drop_nexus() (DanC) Fix strlen() doesn't count the terminator (DanC) Call kfree() on an error path (DanC) Convert tcm_vhost_write_pending to use target_execute_cmd (hch + nab) Fix another strlen() off by one in tcm_vhost_make_tport (DanC) Add option under drivers/staging/Kconfig, and move to drivers/vhost/tcm/ as requested by MST (nab) Changelog v1 -> v2: Fix tv_cmd completion -> release SGL memory leak (nab) Fix sparse warnings for static variable usage ((Fengguang Wu) Fix sparse warnings for min() typing + printk format specs (Fengguang Wu) Convert to cmwq submission for I/O dispatch (nab + hch) Changelog v0 -> v1: Merge into single source + header file, and move to drivers/vhost/ Acked-by: Michael S. Tsirkin <mst@redhat.com> Cc: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com> Cc: Anthony Liguori <aliguori@us.ibm.com> Cc: Zhi Yong Wu <wuzhy@cn.ibm.com> Cc: Paolo Bonzini <pbonzini@redhat.com> Cc: Christoph Hellwig <hch@lst.de> Cc: Hannes Reinecke <hare@suse.de> Cc: Jens Axboe <axboe@kernel.dk> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
2010-02-18net/macvtap: add vhost supportArnd Bergmann
This adds support for passing a macvtap file descriptor into vhost-net, much like we already do for tun/tap. Most of the new code is taken from the respective patch in the tun driver and may get consolidated in the future. Signed-off-by: Arnd Bergmann <arnd@arndb.de> Acked-by: Sridhar Samudrala <sri@us.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2010-01-21vhost: fix TUN=m VHOST_NET=yMichael S. Tsirkin
drivers/built-in.o: In function `get_tun_socket': net.c:(.text+0x15436e): undefined reference to `tun_get_socket' If tun is a module, vhost must be a module, too. If tun is built-in or disabled, vhost can be built-in. Note: TUN || !TUN might look a bit strange until you realize that boolean logic rules do not apply for tristate variables. Reported-by: Randy Dunlap <randy.dunlap@oracle.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Acked-by: Randy Dunlap <randy.dunlap@oracle.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2010-01-15vhost_net: a kernel-level virtio serverMichael S. Tsirkin
What it is: vhost net is a character device that can be used to reduce the number of system calls involved in virtio networking. Existing virtio net code is used in the guest without modification. There's similarity with vringfd, with some differences and reduced scope - uses eventfd for signalling - structures can be moved around in memory at any time (good for migration, bug work-arounds in userspace) - write logging is supported (good for migration) - support memory table and not just an offset (needed for kvm) common virtio related code has been put in a separate file vhost.c and can be made into a separate module if/when more backends appear. I used Rusty's lguest.c as the source for developing this part : this supplied me with witty comments I wouldn't be able to write myself. What it is not: vhost net is not a bus, and not a generic new system call. No assumptions are made on how guest performs hypercalls. Userspace hypervisors are supported as well as kvm. How it works: Basically, we connect virtio frontend (configured by userspace) to a backend. The backend could be a network device, or a tap device. Backend is also configured by userspace, including vlan/mac etc. Status: This works for me, and I haven't see any crashes. Compared to userspace, people reported improved latency (as I save up to 4 system calls per packet), as well as better bandwidth and CPU utilization. Features that I plan to look at in the future: - mergeable buffers - zero copy - scalability tuning: figure out the best threading model to use Note on RCU usage (this is also documented in vhost.h, near private_pointer which is the value protected by this variant of RCU): what is happening is that the rcu_dereference() is being used in a workqueue item. The role of rcu_read_lock() is taken on by the start of execution of the workqueue item, of rcu_read_unlock() by the end of execution of the workqueue item, and of synchronize_rcu() by flush_workqueue()/flush_work(). In the future we might need to apply some gcc attribute or sparse annotation to the function passed to INIT_WORK(). Paul's ack below is for this RCU usage. (Includes fixes by Alan Cox <alan@linux.intel.com>, David L Stevens <dlstevens@us.ibm.com>, Chris Wright <chrisw@redhat.com>) Acked-by: Rusty Russell <rusty@rustcorp.com.au> Acked-by: Arnd Bergmann <arnd@arndb.de> Acked-by: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>