1 files changed, 71 insertions, 0 deletions
diff --git a/drivers/hv/mshv_eventfd.h b/drivers/hv/mshv_eventfd.h
new file mode 100644
index 000000000000..332e7670a344
--- /dev/null
+++ b/drivers/hv/mshv_eventfd.h
@@ -0,0 +1,71 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * irqfd: Allows an fd to be used to inject an interrupt to the guest.
+ * ioeventfd: Allow an fd to be used to receive a signal from the guest.
+ * All credit goes to kvm developers.
+ */
+
+#ifndef __LINUX_MSHV_EVENTFD_H
+#define __LINUX_MSHV_EVENTFD_H
+
+#include <linux/poll.h>
+
+#include "mshv.h"
+#include "mshv_root.h"
+
+/* struct to contain list of irqfds sharing an irq. Updates are protected by
+ * partition.irqfds.resampler_lock
+ */
+struct mshv_irqfd_resampler {
+	struct mshv_partition	    *rsmplr_partn;
+	struct hlist_head	     rsmplr_irqfd_list;
+	struct mshv_irq_ack_notifier rsmplr_notifier;
+	struct hlist_node	     rsmplr_hnode;
+};
+
+struct mshv_irqfd {
+	struct mshv_partition		    *irqfd_partn;
+	struct eventfd_ctx		    *irqfd_eventfd_ctx;
+	struct mshv_guest_irq_ent	     irqfd_girq_ent;
+	seqcount_spinlock_t		     irqfd_irqe_sc;
+	u32				     irqfd_irqnum;
+	struct mshv_lapic_irq		     irqfd_lapic_irq;
+	struct hlist_node		     irqfd_hnode;
+	poll_table			     irqfd_polltbl;
+	wait_queue_head_t		    *irqfd_wqh;
+	wait_queue_entry_t		     irqfd_wait;
+	struct work_struct		     irqfd_shutdown;
+	struct mshv_irqfd_resampler	    *irqfd_resampler;
+	struct eventfd_ctx		    *irqfd_resamplefd;
+	struct hlist_node		     irqfd_resampler_hnode;
+};
+
+void mshv_eventfd_init(struct mshv_partition *partition);
+void mshv_eventfd_release(struct mshv_partition *partition);
+
+void mshv_register_irq_ack_notifier(struct mshv_partition *partition,
+				    struct mshv_irq_ack_notifier *mian);
+void mshv_unregister_irq_ack_notifier(struct mshv_partition *partition,
+				      struct mshv_irq_ack_notifier *mian);
+bool mshv_notify_acked_gsi(struct mshv_partition *partition, int gsi);
+
+int mshv_set_unset_irqfd(struct mshv_partition *partition,
+			 struct mshv_user_irqfd *args);
+
+int mshv_irqfd_wq_init(void);
+void mshv_irqfd_wq_cleanup(void);
+
+struct mshv_ioeventfd {
+	struct hlist_node    iovntfd_hnode;
+	u64		     iovntfd_addr;
+	int		     iovntfd_length;
+	struct eventfd_ctx  *iovntfd_eventfd;
+	u64		     iovntfd_datamatch;
+	int		     iovntfd_doorbell_id;
+	bool		     iovntfd_wildcard;
+};
+
+int mshv_set_unset_ioeventfd(struct mshv_partition *pt,
+			     struct mshv_user_ioeventfd *args);
+
+#endif /* __LINUX_MSHV_EVENTFD_H */