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xen/evtchn: Introduce new IOCTL to bind static evtchn

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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>
This commit is contained in:
Rahul Singh
2023-07-18 12:31:07 +01:00
committed by Juergen Gross
parent 0d8f7cc805
commit 58f6259b7a
4 changed files with 50 additions and 21 deletions
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11
include/xen/events.h
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@@ -69,7 +69,7 @@ int xen_set_irq_priority(unsigned irq, unsigned priority);
/*
* Allow extra references to event channels exposed to userspace by evtchn
*/
int evtchn_make_refcounted(evtchn_port_t evtchn);
int evtchn_make_refcounted(evtchn_port_t evtchn, bool is_static);
int evtchn_get(evtchn_port_t evtchn);
void evtchn_put(evtchn_port_t evtchn);
@@ -141,4 +141,13 @@ void xen_init_IRQ(void);
irqreturn_t xen_debug_interrupt(int irq, void *dev_id);
static inline void xen_evtchn_close(evtchn_port_t port)
{
struct evtchn_close close;
close.port = port;
if (HYPERVISOR_event_channel_op(EVTCHNOP_close, &close) != 0)
BUG();
}
#endif /* _XEN_EVENTS_H */