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RE: [Xen-devel] Question about evtchn_callback reentry
| To: | "Keir Fraser" <keir@xxxxxxxxxxxxx> |
|---|---|
| Subject: | RE: [Xen-devel] Question about evtchn_callback reentry |
| From: | "Xu, Anthony" <anthony.xu@xxxxxxxxx> |
| Date: | Wed, 20 Dec 2006 18:08:02 +0800 |
| Cc: | xen-devel@xxxxxxxxxxxxxxxxxxx, xen-ia64-devel <xen-ia64-devel@xxxxxxxxxxxxxxxxxxx> |
| Delivery-date: | Wed, 20 Dec 2006 02:08:41 -0800 |
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| Thread-topic: | [Xen-devel] Question about evtchn_callback reentry |
Keir Fraser write on 2006年12月20日 16:31:
> On 20/12/06 3:03 am, "Xu, Anthony" <anthony.xu@xxxxxxxxx> wrote:
>
> How did you implement nesting avoidance? It'll be a bit subtle to get
> right.
I added another global_event_mask in share page.
1. before injecting to event_callback_handler, set global_event_mask to 1 to
disable event inject..
2. after event_callback_handler is executed, it will return to ia64_leave_kernel
assembly code in dom0, in this assembly code, it sets global_event_mask to 0
to enable event inject.
There is no other code operating the global_event_mask.
Global_event_mask is initiated to 0(unmask).
Only global_event_mask is 0 and vcpu->vcpu_info->evtchn_upcall_mask is 0,
Can XEN injects to event_callback_handler of dom0.
--Anthony
>
> -- Keir
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