All of lore.kernel.org
 help / color / mirror / Atom feed
From: Julien Grall <julien.grall@citrix.com>
To: Ian Campbell <ian.campbell@citrix.com>,
	Vijay Kilari <vijay.kilari@gmail.com>
Cc: manish.jaggi@caviumnetworks.com,
	Julien Grall <julien.grall@linaro.org>,
	Stefano Stabellini <stefano.stabellini@citrix.com>,
	xen-devel <xen-devel@lists.xen.org>
Subject: Re: [Draft F] Xen on ARM vITS Handling
Date: Fri, 12 Jun 2015 09:09:48 -0400	[thread overview]
Message-ID: <557ADA1C.8050700@citrix.com> (raw)
In-Reply-To: <1434099156.30003.196.camel@citrix.com>

Hi Ian,

On 12/06/2015 04:52, Ian Campbell wrote:
> On Fri, 2015-06-12 at 14:07 +0530, Vijay Kilari wrote:
> So pLPIs must be routed at device assignment time because in the vLPI
> configuration table trap there is no mapping back to a single pLPI.

I just remembered the exact reason that made use to differ SPI enabling.
When the device is assigned, the domain VCPUs are still down (even VCPU0).

If we receive an interrupt before the VCPU0 is unpaused, the interrupt 
will be lost. Same if the interrupt is not yet configured (i.e before 
the vITS setup correctly the table) with your proposal.

This could happen when the device is not quiescent. We had this issue on 
the vexpress at boot time when the network card was trying to send an 
interrupt before DOM0 is setup.

Regards,

-- 
Julien Grall

  reply	other threads:[~2015-06-12 13:09 UTC|newest]

Thread overview: 18+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-06-11  9:40 [Draft F] Xen on ARM vITS Handling Ian Campbell
2015-06-11 12:02 ` Ian Campbell
2015-06-12  8:37 ` Vijay Kilari
2015-06-12  8:52   ` Ian Campbell
2015-06-12 13:09     ` Julien Grall [this message]
2015-06-12 13:16       ` Ian Campbell
2015-06-12 13:32         ` Julien Grall
2015-06-12 14:05           ` Julien Grall
2015-06-12 14:12             ` Ian Campbell
2015-06-12 14:24           ` Ian Campbell
2015-06-12 17:55             ` Julien Grall
2015-06-16 15:10               ` Ian Campbell
2015-06-16 16:14                 ` Julien Grall
2015-06-12 12:55 ` Ian Campbell
2015-06-12 13:14   ` Julien Grall
2015-06-12 13:26     ` Ian Campbell
2015-06-16 14:50 ` Vijay Kilari
2015-06-16 15:07   ` Ian Campbell

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=557ADA1C.8050700@citrix.com \
    --to=julien.grall@citrix.com \
    --cc=ian.campbell@citrix.com \
    --cc=julien.grall@linaro.org \
    --cc=manish.jaggi@caviumnetworks.com \
    --cc=stefano.stabellini@citrix.com \
    --cc=vijay.kilari@gmail.com \
    --cc=xen-devel@lists.xen.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.