On 29/07/17 18:59, Liu Shuo wrote:
> 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: Liu Shuo <shuo.a....@intel.com>
Pushed to xen/tip.git for-linus-4.13b
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