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Re: [Xen-devel] [RFC PATCH v2 13/22] xen/arm: its: Add virtual ITS command support
- To: Manish Jaggi <mjaggi@xxxxxxxxxxxxxxxxxx>, Vijay Kilari <vijay.kilari@xxxxxxxxx>
- From: Julien Grall <julien.grall@xxxxxxxxxx>
- Date: Wed, 29 Apr 2015 14:16:36 +0100
- Cc: Ian Campbell <ian.campbell@xxxxxxxxxx>, Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>, Prasun Kapoor <Prasun.Kapoor@xxxxxxxxxxxxxxxxxx>, Vijaya Kumar K <vijaya.kumar@xxxxxxxxxxxxxxxxxx>, Julien Grall <julien.grall@xxxxxxxxxx>, Tim Deegan <tim@xxxxxxx>, "xen-devel@xxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxx>, Stefano Stabellini <stefano.stabellini@xxxxxxxxxx>, manish.jaggi@xxxxxxxxxxxxxxxxxx
- Delivery-date: Wed, 29 Apr 2015 13:18:12 +0000
- List-id: Xen developer discussion <xen-devel.lists.xen.org>
On 29/04/15 14:08, Manish Jaggi wrote:
>>> Do you have any other security concern ?
>> Yes. The one we talked in every mail since the beginning of this thread
>> "polling in EL2". We got several XSA because the hypervisor code wasn't
>> preemptible (see [1])
>>
> We are removing polling using command processing completion which is
> signalled using INT interrupt.
Based on the discussion with Vijay, the completion based on the INT
command doesn't seems the right solution (see in particular [1] and [2])
Could you wait the end of this discussion before starting to implement
something that you may have to throw later?
Regards,
[1] http://lists.xen.org/archives/html/xen-devel/2015-04/msg03038.html
[2] http://lists.xen.org/archives/html/xen-devel/2015-04/msg03056.html
--
Julien Grall
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