• Liu Shuo's avatar
    xen/events: Fix interrupt lost during irq_disable and irq_enable · 020db9d3
    Liu Shuo authored
    
    
    Here is a device has xen-pirq-MSI interrupt. Dom0 might lost interrupt
    during driver irq_disable/irq_enable. Here is the scenario,
     1. irq_disable -> disable_dynirq -> mask_evtchn(irq channel)
     2. dev interrupt raised by HW and Xen mark its evtchn as pending
     3. irq_enable -> startup_pirq -> eoi_pirq ->
        clear_evtchn(channel of irq) -> clear pending status
     4. consume_one_event process the irq event without pending bit assert
        which result in interrupt lost once
     5. No HW interrupt raising anymore.
    
    Now use enable_dynirq for enable_pirq of xen_pirq_chip to remove
    eoi_pirq when irq_enable.
    Signed-off-by: default avatarLiu Shuo <shuo.a.liu@intel.com>
    Reviewed-by: default avatarBoris Ostrovsky <boris.ostrovsky@oracle.com>
    Signed-off-by: default avatarJuergen Gross <jgross@suse.com>
    020db9d3
events_base.c 37.9 KB