From 9cc63f8bcd560c760d0b12e15bba8f81c86237cf Mon Sep 17 00:00:00 2001 From: "Paul E. McKenney" Date: Fri, 14 Aug 2026 15:43:51 -0700 Subject: Merge branches 'expcb.2026.07.24a', 'misc.2026.07.30a', 'rcu-tasks.2026.07.30a', 'srcu.2026.08.11a' and 'torture.2026.08.14a' into HEAD Changes: Make expedited grace periods expedite normal RCU callbacks Miscellaneous fixes: * Improve diagnostic output with character task states. * Mark accesses to inform KCSAN of concurrency design. * Move from kmalloc() to kmalloc_obj(). * Documentation updates. * Improve handling of RCU deferred quiescent states. * Clean up unused function arguments and structure fields. * Reduce show_rcu_gp_kthreads() stack space. Tasks RCU updates: * Clean up after SRCU re-implementation of Tasks Trace RCU. * Mark accesses to inform KCSAN of concurrency design. * Add ->lazy_timer status to diagnostic output. * Remove an unnecessary memory barrier. * Fix a data race, courtesy of KCSAN. * Documentation updates. * Convert cond_resched_tasks_rcu_qs() from macro to static inline function. SRCU updates: * Add Rust helpers for SRCU. * Avoid losing queued work at cleanup_srcu_struct() time. Torture-test updates: * Preparation work for immediate RCU priority deboosting. * Test RCU readers from real interrupt handlers (as opposed to softirq). * Simplify code through use of cpumask_next_wrap(). * Improve diagnostic output with character task states. * Add rcutorture.nwriters parameter to allow lightweight stall testing, and rcutorture.stall_only to make doing so easier. * Test an RCU Tasks Trace grace period implying an RCU grace period. * Make RCU Tasks Trace torturing track reader batches. * Fix a data race, courtesy of KCSAN. * Plug a shuffle_tmp_mask memory leak on kthread spawn failure. --- drivers/vhost/Kconfig | 116 ++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 116 insertions(+) create mode 100644 drivers/vhost/Kconfig (limited to 'drivers/vhost/Kconfig') diff --git a/drivers/vhost/Kconfig b/drivers/vhost/Kconfig new file mode 100644 index 000000000..bc0f38574 --- /dev/null +++ b/drivers/vhost/Kconfig @@ -0,0 +1,116 @@ +# SPDX-License-Identifier: GPL-2.0-only +config VHOST_IOTLB + tristate + help + Generic IOTLB implementation for vhost and vringh. + This option is selected by any driver which needs to support + an IOMMU in software. + +config VHOST_RING + tristate + select VHOST_IOTLB + help + This option is selected by any driver which needs to access + the host side of a virtio ring. + +config VHOST_TASK + bool + default n + +config VHOST + tristate + select VHOST_IOTLB + select VHOST_TASK + help + This option is selected by any driver which needs to access + the core of vhost. + +menuconfig VHOST_MENU + bool "VHOST drivers" + default y + +if VHOST_MENU + +config VHOST_NET + tristate "Host kernel accelerator for virtio net" + depends on NET && EVENTFD && (TUN || !TUN) && (TAP || !TAP) + select VHOST + help + This kernel module can be loaded in host kernel to accelerate + guest networking with virtio_net. Not to be confused with virtio_net + module itself which needs to be loaded in guest kernel. + + To compile this driver as a module, choose M here: the module will + be called vhost_net. + +config VHOST_SCSI + tristate "VHOST_SCSI TCM fabric driver" + depends on TARGET_CORE && EVENTFD + select VHOST + select SG_POOL + default n + help + Say M here to enable the vhost_scsi TCM fabric module + for use with virtio-scsi guests + +config VHOST_VSOCK + tristate "vhost virtio-vsock driver" + depends on VSOCKETS && EVENTFD + select VHOST + select VIRTIO_VSOCKETS_COMMON + default n + help + This kernel module can be loaded in the host kernel to provide AF_VSOCK + sockets for communicating with guests. The guests must have the + virtio_transport.ko driver loaded to use the virtio-vsock device. + + To compile this driver as a module, choose M here: the module will be called + vhost_vsock. + +config VHOST_VDPA + tristate "Vhost driver for vDPA-based backend" + depends on EVENTFD + select VHOST + select IRQ_BYPASS_MANAGER + depends on VDPA + help + This kernel module can be loaded in host kernel to accelerate + guest virtio devices with the vDPA-based backends. + + To compile this driver as a module, choose M here: the module + will be called vhost_vdpa. + +config VHOST_CROSS_ENDIAN_LEGACY + bool "Cross-endian support for vhost" + default n + help + This option allows vhost to support guests with a different byte + ordering from host while using legacy virtio. + + Userspace programs can control the feature using the + VHOST_SET_VRING_ENDIAN and VHOST_GET_VRING_ENDIAN ioctls. + + This is only useful on a few platforms (ppc64 and arm64). Since it + adds some overhead, it is disabled by default. + + If unsure, say "N". + +config VHOST_ENABLE_FORK_OWNER_CONTROL + bool "Enable VHOST_ENABLE_FORK_OWNER_CONTROL" + default y + help + This option enables two IOCTLs: VHOST_SET_FORK_FROM_OWNER and + VHOST_GET_FORK_FROM_OWNER. These allow userspace applications + to modify the vhost worker mode for vhost devices. + + Also expose module parameter 'fork_from_owner_default' to allow users + to configure the default mode for vhost workers. + + By default, `VHOST_ENABLE_FORK_OWNER_CONTROL` is set to `y`, + users can change the worker thread mode as needed. + If this config is disabled (n),the related IOCTLs and parameters will + be unavailable. + + If unsure, say "Y". + +endif -- cgit v1.3.1