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Re: [Xen-devel] The use of evtchn_upcall_mask

To: Yaogun Wen <techno.geek.0x01@xxxxxxxxx>
From: Ian Campbell <Ian.Campbell@xxxxxxxxxx>
Date: Fri, 21 Sep 2012 14:24:44 +0100
Cc: "xen-devel@xxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxx>
Delivery-date: Fri, 21 Sep 2012 13:25:28 +0000
List-id: Xen developer discussion <xen-devel.lists.xen.org>

On Fri, 2012-09-21 at 14:12 +0100, Yaogun Wen wrote:
> I don't know if i understand this part correctly, it seems that
> evtchn_upcall_mask is useless. 

It is read from assembly code (entry.S) accessed via
VCPUINFO_upcall_mask which is defined using the asm-offsets.c mechanism.

local_event_delivery_is_enabled seems to be redundant these days.

Ian.

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References:
- [Xen-devel] The use of evtchn_upcall_mask
  - From: Yaogun Wen

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