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![Tejun Heo](/assets/img/avatar_default.png)
percpu.h is included by sched.h and module.h and thus ends up being included when building most .c files. percpu.h includes slab.h which in turn includes gfp.h making everything defined by the two files universally available and complicating inclusion dependencies. percpu.h -> slab.h dependency is about to be removed. Prepare for this change by updating users of gfp and slab facilities include those headers directly instead of assuming availability. As this conversion needs to touch large number of source files, the following script is used as the basis of conversion. http://userweb.kernel.org/~tj/misc/slabh-sweep.py The script does the followings. * Scan files for gfp and slab usages and update includes such that only the necessary includes are there. ie. if only gfp is used, gfp.h, if slab is used, slab.h. * When the script inserts a new include, it looks at the include blocks and try to put the new include such that its order conforms to its surrounding. It's put in the include block which contains core kernel includes, in the same order that the rest are ordered - alphabetical, Christmas tree, rev-Xmas-tree or at the end if there doesn't seem to be any matching order. * If the script can't find a place to put a new include (mostly because the file doesn't have fitting include block), it prints out an error message indicating which .h file needs to be added to the file. The conversion was done in the following steps. 1. The initial automatic conversion of all .c files updated slightly over 4000 files, deleting around 700 includes and adding ~480 gfp.h and ~3000 slab.h inclusions. The script emitted errors for ~400 files. 2. Each error was manually checked. Some didn't need the inclusion, some needed manual addition while adding it to implementation .h or embedding .c file was more appropriate for others. This step added inclusions to around 150 files. 3. The script was run again and the output was compared to the edits from #2 to make sure no file was left behind. 4. Several build tests were done and a couple of problems were fixed. e.g. lib/decompress_*.c used malloc/free() wrappers around slab APIs requiring slab.h to be added manually. 5. The script was run on all .h files but without automatically editing them as sprinkling gfp.h and slab.h inclusions around .h files could easily lead to inclusion dependency hell. Most gfp.h inclusion directives were ignored as stuff from gfp.h was usually wildly available and often used in preprocessor macros. Each slab.h inclusion directive was examined and added manually as necessary. 6. percpu.h was updated not to include slab.h. 7. Build test were done on the following configurations and failures were fixed. CONFIG_GCOV_KERNEL was turned off for all tests (as my distributed build env didn't work with gcov compiles) and a few more options had to be turned off depending on archs to make things build (like ipr on powerpc/64 which failed due to missing writeq). * x86 and x86_64 UP and SMP allmodconfig and a custom test config. * powerpc and powerpc64 SMP allmodconfig * sparc and sparc64 SMP allmodconfig * ia64 SMP allmodconfig * s390 SMP allmodconfig * alpha SMP allmodconfig * um on x86_64 SMP allmodconfig 8. percpu.h modifications were reverted so that it could be applied as a separate patch and serve as bisection point. Given the fact that I had only a couple of failures from tests on step 6, I'm fairly confident about the coverage of this conversion patch. If there is a breakage, it's likely to be something in one of the arch headers which should be easily discoverable easily on most builds of the specific arch. Signed-off-by: Tejun Heo <tj@kernel.org> Guess-its-ok-by: Christoph Lameter <cl@linux-foundation.org> Cc: Ingo Molnar <mingo@redhat.com> Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
586 lines
13 KiB
C
586 lines
13 KiB
C
/*
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* kvm eventfd support - use eventfd objects to signal various KVM events
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*
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* Copyright 2009 Novell. All Rights Reserved.
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*
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* Author:
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* Gregory Haskins <ghaskins@novell.com>
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*
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* This file is free software; you can redistribute it and/or modify
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* it under the terms of version 2 of the GNU General Public License
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* as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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#include <linux/kvm_host.h>
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#include <linux/kvm.h>
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#include <linux/workqueue.h>
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#include <linux/syscalls.h>
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#include <linux/wait.h>
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#include <linux/poll.h>
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#include <linux/file.h>
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#include <linux/list.h>
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#include <linux/eventfd.h>
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#include <linux/kernel.h>
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#include <linux/slab.h>
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#include "iodev.h"
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/*
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* --------------------------------------------------------------------
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* irqfd: Allows an fd to be used to inject an interrupt to the guest
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*
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* Credit goes to Avi Kivity for the original idea.
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* --------------------------------------------------------------------
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*/
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struct _irqfd {
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struct kvm *kvm;
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struct eventfd_ctx *eventfd;
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int gsi;
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struct list_head list;
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poll_table pt;
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wait_queue_t wait;
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struct work_struct inject;
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struct work_struct shutdown;
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};
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static struct workqueue_struct *irqfd_cleanup_wq;
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static void
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irqfd_inject(struct work_struct *work)
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{
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struct _irqfd *irqfd = container_of(work, struct _irqfd, inject);
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struct kvm *kvm = irqfd->kvm;
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kvm_set_irq(kvm, KVM_USERSPACE_IRQ_SOURCE_ID, irqfd->gsi, 1);
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kvm_set_irq(kvm, KVM_USERSPACE_IRQ_SOURCE_ID, irqfd->gsi, 0);
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}
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/*
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* Race-free decouple logic (ordering is critical)
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*/
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static void
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irqfd_shutdown(struct work_struct *work)
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{
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struct _irqfd *irqfd = container_of(work, struct _irqfd, shutdown);
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u64 cnt;
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/*
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* Synchronize with the wait-queue and unhook ourselves to prevent
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* further events.
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*/
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eventfd_ctx_remove_wait_queue(irqfd->eventfd, &irqfd->wait, &cnt);
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/*
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* We know no new events will be scheduled at this point, so block
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* until all previously outstanding events have completed
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*/
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flush_work(&irqfd->inject);
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/*
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* It is now safe to release the object's resources
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*/
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eventfd_ctx_put(irqfd->eventfd);
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kfree(irqfd);
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}
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/* assumes kvm->irqfds.lock is held */
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static bool
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irqfd_is_active(struct _irqfd *irqfd)
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{
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return list_empty(&irqfd->list) ? false : true;
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}
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/*
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* Mark the irqfd as inactive and schedule it for removal
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*
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* assumes kvm->irqfds.lock is held
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*/
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static void
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irqfd_deactivate(struct _irqfd *irqfd)
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{
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BUG_ON(!irqfd_is_active(irqfd));
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list_del_init(&irqfd->list);
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queue_work(irqfd_cleanup_wq, &irqfd->shutdown);
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}
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/*
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* Called with wqh->lock held and interrupts disabled
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*/
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static int
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irqfd_wakeup(wait_queue_t *wait, unsigned mode, int sync, void *key)
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{
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struct _irqfd *irqfd = container_of(wait, struct _irqfd, wait);
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unsigned long flags = (unsigned long)key;
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if (flags & POLLIN)
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/* An event has been signaled, inject an interrupt */
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schedule_work(&irqfd->inject);
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if (flags & POLLHUP) {
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/* The eventfd is closing, detach from KVM */
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struct kvm *kvm = irqfd->kvm;
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unsigned long flags;
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spin_lock_irqsave(&kvm->irqfds.lock, flags);
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/*
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* We must check if someone deactivated the irqfd before
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* we could acquire the irqfds.lock since the item is
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* deactivated from the KVM side before it is unhooked from
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* the wait-queue. If it is already deactivated, we can
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* simply return knowing the other side will cleanup for us.
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* We cannot race against the irqfd going away since the
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* other side is required to acquire wqh->lock, which we hold
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*/
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if (irqfd_is_active(irqfd))
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irqfd_deactivate(irqfd);
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spin_unlock_irqrestore(&kvm->irqfds.lock, flags);
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}
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return 0;
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}
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static void
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irqfd_ptable_queue_proc(struct file *file, wait_queue_head_t *wqh,
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poll_table *pt)
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{
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struct _irqfd *irqfd = container_of(pt, struct _irqfd, pt);
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add_wait_queue(wqh, &irqfd->wait);
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}
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static int
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kvm_irqfd_assign(struct kvm *kvm, int fd, int gsi)
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{
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struct _irqfd *irqfd, *tmp;
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struct file *file = NULL;
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struct eventfd_ctx *eventfd = NULL;
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int ret;
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unsigned int events;
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irqfd = kzalloc(sizeof(*irqfd), GFP_KERNEL);
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if (!irqfd)
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return -ENOMEM;
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irqfd->kvm = kvm;
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irqfd->gsi = gsi;
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INIT_LIST_HEAD(&irqfd->list);
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INIT_WORK(&irqfd->inject, irqfd_inject);
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INIT_WORK(&irqfd->shutdown, irqfd_shutdown);
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file = eventfd_fget(fd);
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if (IS_ERR(file)) {
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ret = PTR_ERR(file);
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goto fail;
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}
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eventfd = eventfd_ctx_fileget(file);
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if (IS_ERR(eventfd)) {
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ret = PTR_ERR(eventfd);
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goto fail;
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}
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irqfd->eventfd = eventfd;
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/*
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* Install our own custom wake-up handling so we are notified via
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* a callback whenever someone signals the underlying eventfd
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*/
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init_waitqueue_func_entry(&irqfd->wait, irqfd_wakeup);
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init_poll_funcptr(&irqfd->pt, irqfd_ptable_queue_proc);
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spin_lock_irq(&kvm->irqfds.lock);
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ret = 0;
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list_for_each_entry(tmp, &kvm->irqfds.items, list) {
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if (irqfd->eventfd != tmp->eventfd)
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continue;
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/* This fd is used for another irq already. */
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ret = -EBUSY;
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spin_unlock_irq(&kvm->irqfds.lock);
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goto fail;
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}
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events = file->f_op->poll(file, &irqfd->pt);
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list_add_tail(&irqfd->list, &kvm->irqfds.items);
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spin_unlock_irq(&kvm->irqfds.lock);
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/*
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* Check if there was an event already pending on the eventfd
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* before we registered, and trigger it as if we didn't miss it.
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*/
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if (events & POLLIN)
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schedule_work(&irqfd->inject);
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/*
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* do not drop the file until the irqfd is fully initialized, otherwise
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* we might race against the POLLHUP
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*/
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fput(file);
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return 0;
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fail:
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if (eventfd && !IS_ERR(eventfd))
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eventfd_ctx_put(eventfd);
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if (!IS_ERR(file))
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fput(file);
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kfree(irqfd);
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return ret;
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}
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void
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kvm_eventfd_init(struct kvm *kvm)
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{
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spin_lock_init(&kvm->irqfds.lock);
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INIT_LIST_HEAD(&kvm->irqfds.items);
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INIT_LIST_HEAD(&kvm->ioeventfds);
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}
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/*
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* shutdown any irqfd's that match fd+gsi
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*/
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static int
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kvm_irqfd_deassign(struct kvm *kvm, int fd, int gsi)
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{
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struct _irqfd *irqfd, *tmp;
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struct eventfd_ctx *eventfd;
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eventfd = eventfd_ctx_fdget(fd);
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if (IS_ERR(eventfd))
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return PTR_ERR(eventfd);
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spin_lock_irq(&kvm->irqfds.lock);
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list_for_each_entry_safe(irqfd, tmp, &kvm->irqfds.items, list) {
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if (irqfd->eventfd == eventfd && irqfd->gsi == gsi)
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irqfd_deactivate(irqfd);
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}
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spin_unlock_irq(&kvm->irqfds.lock);
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eventfd_ctx_put(eventfd);
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/*
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* Block until we know all outstanding shutdown jobs have completed
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* so that we guarantee there will not be any more interrupts on this
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* gsi once this deassign function returns.
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*/
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flush_workqueue(irqfd_cleanup_wq);
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return 0;
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}
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int
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kvm_irqfd(struct kvm *kvm, int fd, int gsi, int flags)
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{
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if (flags & KVM_IRQFD_FLAG_DEASSIGN)
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return kvm_irqfd_deassign(kvm, fd, gsi);
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return kvm_irqfd_assign(kvm, fd, gsi);
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}
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/*
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* This function is called as the kvm VM fd is being released. Shutdown all
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* irqfds that still remain open
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*/
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void
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kvm_irqfd_release(struct kvm *kvm)
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{
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struct _irqfd *irqfd, *tmp;
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spin_lock_irq(&kvm->irqfds.lock);
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list_for_each_entry_safe(irqfd, tmp, &kvm->irqfds.items, list)
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irqfd_deactivate(irqfd);
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spin_unlock_irq(&kvm->irqfds.lock);
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/*
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* Block until we know all outstanding shutdown jobs have completed
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* since we do not take a kvm* reference.
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*/
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flush_workqueue(irqfd_cleanup_wq);
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}
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/*
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* create a host-wide workqueue for issuing deferred shutdown requests
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* aggregated from all vm* instances. We need our own isolated single-thread
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* queue to prevent deadlock against flushing the normal work-queue.
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*/
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static int __init irqfd_module_init(void)
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{
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irqfd_cleanup_wq = create_singlethread_workqueue("kvm-irqfd-cleanup");
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if (!irqfd_cleanup_wq)
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return -ENOMEM;
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return 0;
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}
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static void __exit irqfd_module_exit(void)
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{
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destroy_workqueue(irqfd_cleanup_wq);
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}
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module_init(irqfd_module_init);
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module_exit(irqfd_module_exit);
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/*
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* --------------------------------------------------------------------
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* ioeventfd: translate a PIO/MMIO memory write to an eventfd signal.
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*
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* userspace can register a PIO/MMIO address with an eventfd for receiving
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* notification when the memory has been touched.
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* --------------------------------------------------------------------
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*/
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struct _ioeventfd {
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struct list_head list;
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u64 addr;
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int length;
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struct eventfd_ctx *eventfd;
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u64 datamatch;
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struct kvm_io_device dev;
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bool wildcard;
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};
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static inline struct _ioeventfd *
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to_ioeventfd(struct kvm_io_device *dev)
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{
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return container_of(dev, struct _ioeventfd, dev);
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}
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static void
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ioeventfd_release(struct _ioeventfd *p)
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{
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eventfd_ctx_put(p->eventfd);
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list_del(&p->list);
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kfree(p);
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}
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static bool
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ioeventfd_in_range(struct _ioeventfd *p, gpa_t addr, int len, const void *val)
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{
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u64 _val;
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if (!(addr == p->addr && len == p->length))
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/* address-range must be precise for a hit */
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return false;
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if (p->wildcard)
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/* all else equal, wildcard is always a hit */
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return true;
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/* otherwise, we have to actually compare the data */
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BUG_ON(!IS_ALIGNED((unsigned long)val, len));
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switch (len) {
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case 1:
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_val = *(u8 *)val;
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break;
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case 2:
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_val = *(u16 *)val;
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break;
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case 4:
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_val = *(u32 *)val;
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break;
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case 8:
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_val = *(u64 *)val;
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break;
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default:
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return false;
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}
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return _val == p->datamatch ? true : false;
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}
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/* MMIO/PIO writes trigger an event if the addr/val match */
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static int
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ioeventfd_write(struct kvm_io_device *this, gpa_t addr, int len,
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const void *val)
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{
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struct _ioeventfd *p = to_ioeventfd(this);
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if (!ioeventfd_in_range(p, addr, len, val))
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return -EOPNOTSUPP;
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eventfd_signal(p->eventfd, 1);
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return 0;
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}
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/*
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* This function is called as KVM is completely shutting down. We do not
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* need to worry about locking just nuke anything we have as quickly as possible
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*/
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static void
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ioeventfd_destructor(struct kvm_io_device *this)
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{
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struct _ioeventfd *p = to_ioeventfd(this);
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ioeventfd_release(p);
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}
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static const struct kvm_io_device_ops ioeventfd_ops = {
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.write = ioeventfd_write,
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.destructor = ioeventfd_destructor,
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};
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/* assumes kvm->slots_lock held */
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static bool
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ioeventfd_check_collision(struct kvm *kvm, struct _ioeventfd *p)
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{
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struct _ioeventfd *_p;
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list_for_each_entry(_p, &kvm->ioeventfds, list)
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if (_p->addr == p->addr && _p->length == p->length &&
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(_p->wildcard || p->wildcard ||
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_p->datamatch == p->datamatch))
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return true;
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return false;
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}
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static int
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kvm_assign_ioeventfd(struct kvm *kvm, struct kvm_ioeventfd *args)
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{
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int pio = args->flags & KVM_IOEVENTFD_FLAG_PIO;
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enum kvm_bus bus_idx = pio ? KVM_PIO_BUS : KVM_MMIO_BUS;
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struct _ioeventfd *p;
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struct eventfd_ctx *eventfd;
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int ret;
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/* must be natural-word sized */
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switch (args->len) {
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case 1:
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case 2:
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case 4:
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case 8:
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break;
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default:
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return -EINVAL;
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}
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/* check for range overflow */
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if (args->addr + args->len < args->addr)
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return -EINVAL;
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/* check for extra flags that we don't understand */
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if (args->flags & ~KVM_IOEVENTFD_VALID_FLAG_MASK)
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return -EINVAL;
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eventfd = eventfd_ctx_fdget(args->fd);
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if (IS_ERR(eventfd))
|
|
return PTR_ERR(eventfd);
|
|
|
|
p = kzalloc(sizeof(*p), GFP_KERNEL);
|
|
if (!p) {
|
|
ret = -ENOMEM;
|
|
goto fail;
|
|
}
|
|
|
|
INIT_LIST_HEAD(&p->list);
|
|
p->addr = args->addr;
|
|
p->length = args->len;
|
|
p->eventfd = eventfd;
|
|
|
|
/* The datamatch feature is optional, otherwise this is a wildcard */
|
|
if (args->flags & KVM_IOEVENTFD_FLAG_DATAMATCH)
|
|
p->datamatch = args->datamatch;
|
|
else
|
|
p->wildcard = true;
|
|
|
|
mutex_lock(&kvm->slots_lock);
|
|
|
|
/* Verify that there isnt a match already */
|
|
if (ioeventfd_check_collision(kvm, p)) {
|
|
ret = -EEXIST;
|
|
goto unlock_fail;
|
|
}
|
|
|
|
kvm_iodevice_init(&p->dev, &ioeventfd_ops);
|
|
|
|
ret = kvm_io_bus_register_dev(kvm, bus_idx, &p->dev);
|
|
if (ret < 0)
|
|
goto unlock_fail;
|
|
|
|
list_add_tail(&p->list, &kvm->ioeventfds);
|
|
|
|
mutex_unlock(&kvm->slots_lock);
|
|
|
|
return 0;
|
|
|
|
unlock_fail:
|
|
mutex_unlock(&kvm->slots_lock);
|
|
|
|
fail:
|
|
kfree(p);
|
|
eventfd_ctx_put(eventfd);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int
|
|
kvm_deassign_ioeventfd(struct kvm *kvm, struct kvm_ioeventfd *args)
|
|
{
|
|
int pio = args->flags & KVM_IOEVENTFD_FLAG_PIO;
|
|
enum kvm_bus bus_idx = pio ? KVM_PIO_BUS : KVM_MMIO_BUS;
|
|
struct _ioeventfd *p, *tmp;
|
|
struct eventfd_ctx *eventfd;
|
|
int ret = -ENOENT;
|
|
|
|
eventfd = eventfd_ctx_fdget(args->fd);
|
|
if (IS_ERR(eventfd))
|
|
return PTR_ERR(eventfd);
|
|
|
|
mutex_lock(&kvm->slots_lock);
|
|
|
|
list_for_each_entry_safe(p, tmp, &kvm->ioeventfds, list) {
|
|
bool wildcard = !(args->flags & KVM_IOEVENTFD_FLAG_DATAMATCH);
|
|
|
|
if (p->eventfd != eventfd ||
|
|
p->addr != args->addr ||
|
|
p->length != args->len ||
|
|
p->wildcard != wildcard)
|
|
continue;
|
|
|
|
if (!p->wildcard && p->datamatch != args->datamatch)
|
|
continue;
|
|
|
|
kvm_io_bus_unregister_dev(kvm, bus_idx, &p->dev);
|
|
ioeventfd_release(p);
|
|
ret = 0;
|
|
break;
|
|
}
|
|
|
|
mutex_unlock(&kvm->slots_lock);
|
|
|
|
eventfd_ctx_put(eventfd);
|
|
|
|
return ret;
|
|
}
|
|
|
|
int
|
|
kvm_ioeventfd(struct kvm *kvm, struct kvm_ioeventfd *args)
|
|
{
|
|
if (args->flags & KVM_IOEVENTFD_FLAG_DEASSIGN)
|
|
return kvm_deassign_ioeventfd(kvm, args);
|
|
|
|
return kvm_assign_ioeventfd(kvm, args);
|
|
}
|