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58f6259b7a
Xen 4.17 supports the creation of static evtchns. To allow user space application to bind static evtchns introduce new ioctl "IOCTL_EVTCHN_BIND_STATIC". Existing IOCTL doing more than binding that’s why we need to introduce the new IOCTL to only bind the static event channels. Static evtchns to be available for use during the lifetime of the guest. When the application exits, __unbind_from_irq() ends up being called from release() file operations because of that static evtchns are getting closed. To avoid closing the static event channel, add the new bool variable "is_static" in "struct irq_info" to mark the event channel static when creating the event channel to avoid closing the static evtchn. Also, take this opportunity to remove the open-coded version of the evtchn close in drivers/xen/evtchn.c file and use xen_evtchn_close(). Signed-off-by: Rahul Singh <rahul.singh@arm.com> Reviewed-by: Oleksandr Tyshchenko <oleksandr_tyshchenko@epam.com> Acked-by: Stefano Stabellini <sstabellini@kernel.org> Link: https://lore.kernel.org/r/ae7329bf1713f83e4aad4f3fa0f316258c40a3e9.1689677042.git.rahul.singh@arm.com Signed-off-by: Juergen Gross <jgross@suse.com>
114 lines
3.7 KiB
C
114 lines
3.7 KiB
C
/* SPDX-License-Identifier: ((GPL-2.0 WITH Linux-syscall-note) OR MIT) */
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/******************************************************************************
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* evtchn.h
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*
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* Interface to /dev/xen/evtchn.
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*
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* Copyright (c) 2003-2005, K A Fraser
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License version 2
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* as published by the Free Software Foundation; or, when distributed
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* separately from the Linux kernel or incorporated into other
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* software packages, subject to the following license:
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this source file (the "Software"), to deal in the Software without
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* restriction, including without limitation the rights to use, copy, modify,
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* merge, publish, distribute, sublicense, and/or sell copies of the Software,
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* and to permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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* IN THE SOFTWARE.
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*/
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#ifndef __LINUX_PUBLIC_EVTCHN_H__
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#define __LINUX_PUBLIC_EVTCHN_H__
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/*
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* Bind a fresh port to VIRQ @virq.
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* Return allocated port.
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*/
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#define IOCTL_EVTCHN_BIND_VIRQ \
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_IOC(_IOC_NONE, 'E', 0, sizeof(struct ioctl_evtchn_bind_virq))
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struct ioctl_evtchn_bind_virq {
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unsigned int virq;
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};
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/*
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* Bind a fresh port to remote <@remote_domain, @remote_port>.
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* Return allocated port.
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*/
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#define IOCTL_EVTCHN_BIND_INTERDOMAIN \
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_IOC(_IOC_NONE, 'E', 1, sizeof(struct ioctl_evtchn_bind_interdomain))
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struct ioctl_evtchn_bind_interdomain {
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unsigned int remote_domain, remote_port;
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};
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/*
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* Allocate a fresh port for binding to @remote_domain.
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* Return allocated port.
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*/
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#define IOCTL_EVTCHN_BIND_UNBOUND_PORT \
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_IOC(_IOC_NONE, 'E', 2, sizeof(struct ioctl_evtchn_bind_unbound_port))
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struct ioctl_evtchn_bind_unbound_port {
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unsigned int remote_domain;
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};
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/*
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* Unbind previously allocated @port.
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*/
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#define IOCTL_EVTCHN_UNBIND \
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_IOC(_IOC_NONE, 'E', 3, sizeof(struct ioctl_evtchn_unbind))
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struct ioctl_evtchn_unbind {
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unsigned int port;
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};
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/*
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* Unbind previously allocated @port.
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*/
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#define IOCTL_EVTCHN_NOTIFY \
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_IOC(_IOC_NONE, 'E', 4, sizeof(struct ioctl_evtchn_notify))
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struct ioctl_evtchn_notify {
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unsigned int port;
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};
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/* Clear and reinitialise the event buffer. Clear error condition. */
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#define IOCTL_EVTCHN_RESET \
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_IOC(_IOC_NONE, 'E', 5, 0)
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/*
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* Restrict this file descriptor so that it can only be used to bind
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* new interdomain events from one domain.
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*
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* Once a file descriptor has been restricted it cannot be
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* de-restricted, and must be closed and re-opened. Event channels
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* which were bound before restricting remain bound afterwards, and
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* can be notified as usual.
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*/
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#define IOCTL_EVTCHN_RESTRICT_DOMID \
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_IOC(_IOC_NONE, 'E', 6, sizeof(struct ioctl_evtchn_restrict_domid))
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struct ioctl_evtchn_restrict_domid {
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domid_t domid;
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};
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/*
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* Bind statically allocated @port.
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*/
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#define IOCTL_EVTCHN_BIND_STATIC \
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_IOC(_IOC_NONE, 'E', 7, sizeof(struct ioctl_evtchn_bind))
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struct ioctl_evtchn_bind {
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unsigned int port;
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};
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#endif /* __LINUX_PUBLIC_EVTCHN_H__ */
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