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xen/events: switch user event channels to lateeoi model

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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>
This commit is contained in:
Juergen Gross 2020-09-07 15:47:29 +02:00
parent c2711441bc
commit c44b849cee
1 changed files with 3 additions and 4 deletions
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7
drivers/xen/evtchn.c
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@ -167,7 +167,6 @@ static irqreturn_t evtchn_interrupt(int irq, void *data)
"Interrupt for port %u, but apparently not enabled; per-user %p\n",
evtchn->port, u);
disable_irq_nosync(irq);
evtchn->enabled = false;
spin_lock(&u->ring_prod_lock);
@ -293,7 +292,7 @@ static ssize_t evtchn_write(struct file *file, const char __user *buf,
evtchn = find_evtchn(u, port);
if (evtchn && !evtchn->enabled) {
evtchn->enabled = true;
enable_irq(irq_from_evtchn(port));
xen_irq_lateeoi(irq_from_evtchn(port), 0);
}
}
@ -393,8 +392,8 @@ static int evtchn_bind_to_user(struct per_user_data *u, evtchn_port_t port)
if (rc < 0)
goto err;
rc = bind_evtchn_to_irqhandler(port, evtchn_interrupt, 0,
u->name, evtchn);
rc = bind_evtchn_to_irqhandler_lateeoi(port, evtchn_interrupt, 0,
u->name, evtchn);
if (rc < 0)
goto err;