xen/events: switch user event channels to lateeoi model
commit c44b849cee
upstream.
Instead of disabling the irq when an event is received and enabling
it again when handled by the user process use the lateeoi model.
This is part of XSA-332.
Cc: stable@vger.kernel.org
Reported-by: Julien Grall <julien@xen.org>
Signed-off-by: Juergen Gross <jgross@suse.com>
Tested-by: Stefano Stabellini <sstabellini@kernel.org>
Reviewed-by: Stefano Stabellini <sstabellini@kernel.org>
Reviewed-by: Jan Beulich <jbeulich@suse.com>
Reviewed-by: Wei Liu <wl@xen.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
parent
48b533aa83
commit
b7d6a66e21
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@ -166,7 +166,6 @@ static irqreturn_t evtchn_interrupt(int irq, void *data)
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"Interrupt for port %d, but apparently not enabled; per-user %p\n",
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evtchn->port, u);
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disable_irq_nosync(irq);
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evtchn->enabled = false;
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spin_lock(&u->ring_prod_lock);
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@ -292,7 +291,7 @@ static ssize_t evtchn_write(struct file *file, const char __user *buf,
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evtchn = find_evtchn(u, port);
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if (evtchn && !evtchn->enabled) {
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evtchn->enabled = true;
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enable_irq(irq_from_evtchn(port));
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xen_irq_lateeoi(irq_from_evtchn(port), 0);
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}
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}
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@ -392,7 +391,7 @@ static int evtchn_bind_to_user(struct per_user_data *u, int port)
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if (rc < 0)
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goto err;
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rc = bind_evtchn_to_irqhandler(port, evtchn_interrupt, 0,
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rc = bind_evtchn_to_irqhandler_lateeoi(port, evtchn_interrupt, 0,
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u->name, evtchn);
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if (rc < 0)
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goto err;
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