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    Subject[PATCH 5.9 010/391] xen/events: switch user event channels to lateeoi model
    Date
    From: Juergen Gross <jgross@suse.com>

    commit c44b849cee8c3ac587da3b0980e01f77500d158c 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>

    ---
    drivers/xen/evtchn.c | 7 +++----
    1 file changed, 3 insertions(+), 4 deletions(-)

    --- a/drivers/xen/evtchn.c
    +++ b/drivers/xen/evtchn.c
    @@ -167,7 +167,6 @@ static irqreturn_t evtchn_interrupt(int
    "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
    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 pe
    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;


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