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2b4246153e
While unhooking from the irqfd waitqueue, clear the internal eventfd counter by using eventfd_ctx_remove_wait_queue() instead of remove_wait_queue(), preventing potential spurious interrupts. This removes the need to store a pointer into the workqueue, as the eventfd already keeps track of it. This mimicks what other similar subsystems do on their equivalent paths with their irqfds (KVM, Xen, ACRN support, etc). Signed-off-by: Carlos López <clopez@suse.de> Signed-off-by: Wei Liu <wei.liu@kernel.org>
71 lines
2.2 KiB
C
71 lines
2.2 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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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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* ioeventfd: Allow an fd to be used to receive a signal from the guest.
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* All credit goes to kvm developers.
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*/
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#ifndef __LINUX_MSHV_EVENTFD_H
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#define __LINUX_MSHV_EVENTFD_H
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#include <linux/poll.h>
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#include "mshv.h"
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#include "mshv_root.h"
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/* struct to contain list of irqfds sharing an irq. Updates are protected by
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* partition.irqfds.resampler_lock
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*/
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struct mshv_irqfd_resampler {
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struct mshv_partition *rsmplr_partn;
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struct hlist_head rsmplr_irqfd_list;
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struct mshv_irq_ack_notifier rsmplr_notifier;
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struct hlist_node rsmplr_hnode;
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};
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struct mshv_irqfd {
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struct mshv_partition *irqfd_partn;
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struct eventfd_ctx *irqfd_eventfd_ctx;
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struct mshv_guest_irq_ent irqfd_girq_ent;
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seqcount_spinlock_t irqfd_irqe_sc;
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u32 irqfd_irqnum;
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struct mshv_lapic_irq irqfd_lapic_irq;
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struct hlist_node irqfd_hnode;
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poll_table irqfd_polltbl;
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wait_queue_entry_t irqfd_wait;
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struct work_struct irqfd_shutdown;
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struct mshv_irqfd_resampler *irqfd_resampler;
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struct eventfd_ctx *irqfd_resamplefd;
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struct hlist_node irqfd_resampler_hnode;
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};
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void mshv_eventfd_init(struct mshv_partition *partition);
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void mshv_eventfd_release(struct mshv_partition *partition);
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void mshv_register_irq_ack_notifier(struct mshv_partition *partition,
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struct mshv_irq_ack_notifier *mian);
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void mshv_unregister_irq_ack_notifier(struct mshv_partition *partition,
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struct mshv_irq_ack_notifier *mian);
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bool mshv_notify_acked_gsi(struct mshv_partition *partition, int gsi);
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int mshv_set_unset_irqfd(struct mshv_partition *partition,
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struct mshv_user_irqfd *args);
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int mshv_irqfd_wq_init(void);
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void mshv_irqfd_wq_cleanup(void);
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struct mshv_ioeventfd {
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struct hlist_node iovntfd_hnode;
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u64 iovntfd_addr;
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int iovntfd_length;
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struct eventfd_ctx *iovntfd_eventfd;
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u64 iovntfd_datamatch;
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int iovntfd_doorbell_id;
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bool iovntfd_wildcard;
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};
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int mshv_set_unset_ioeventfd(struct mshv_partition *pt,
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struct mshv_user_ioeventfd *args);
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#endif /* __LINUX_MSHV_EVENTFD_H */
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