All of lore.kernel.org
 help / color / mirror / Atom feed
From: Julien Grall <julien.grall@linaro.org>
To: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Cc: Ian Campbell <Ian.Campbell@citrix.com>,
	Vijay Kilari <vijay.kilari@gmail.com>,
	Prasun Kapoor <Prasun.Kapoor@caviumnetworks.com>,
	Vijaya Kumar K <vijaya.kumar@caviumnetworks.com>,
	xen-devel@lists.xen.org,
	Stefano Stabellini <stefano.stabellini@citrix.com>
Subject: Re: [RFC PATCH v1 10/10] xen/arm: GICv3 device tree parsing
Date: Mon, 24 Mar 2014 18:00:59 +0000	[thread overview]
Message-ID: <533072DB.8040302@linaro.org> (raw)
In-Reply-To: <alpine.DEB.2.02.1403241729120.8273@kaball.uk.xensource.com>

Hi Stefano,

On 24/03/14 17:34, Stefano Stabellini wrote:
> I think that for Dom0 we have to use vgic_v3, because it doesn't only
> give you support for more vcpus but also MSI and MSI-X delivery.

Right.

>
> For DomUs it might be important to support vgic_v2 on gicv3 hardware,
> however I wouldn't want to defer the decision to the user (i.e.
> introduce yet another VM config option), if not for debugging.
>
> Would it be possible to advirtise both gicv2 and gicv3 on device tree?
> What would the guest kernel do in that case?

Linux will try to load both GICv2 and GICv3 drivers. In any case I don't 
think it's a solution because:
	- you don't know how the kernel will react
         - how will you choose which backend to use?

> Otherwise we could default to vgic_v2 if vcpus <= 8 and vgic_v3 if
> vcpus > 8.

What about kernel which only support GICv3 and have less than 8 VCPUS?
What about of device (MSI, ...) passthrough with this kind of kernel?

I think we need to have a VM config option in this specific case.

Regards,

-- 
Julien Grall

  reply	other threads:[~2014-03-24 18:00 UTC|newest]

Thread overview: 95+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-03-19 14:17 [RFC PATCH v1 00/10] xen/arm: Add GICv3 support vijay.kilari
2014-03-19 14:17 ` [RFC PATCH v1 01/10] xen/arm: make secondary gic init as notifier call vijay.kilari
2014-03-20 12:48   ` Julien Grall
2014-03-22  8:16     ` Vijay Kilari
2014-03-23 14:38       ` Julien Grall
2014-03-26 11:27         ` Vijay Kilari
2014-03-26 14:41           ` Julien Grall
2014-03-26 17:22             ` George Dunlap
2014-03-21 17:15   ` Ian Campbell
2014-03-22  8:32     ` Vijay Kilari
2014-03-22 13:54       ` Julien Grall
2014-03-24 10:53         ` Ian Campbell
2014-03-19 14:17 ` [RFC PATCH v1 02/10] xen/arm: register mmio handler at runtime vijay.kilari
2014-03-20 13:18   ` Julien Grall
2014-03-21 13:19     ` Andrii Tseglytskyi
2014-03-21 17:17   ` Ian Campbell
2014-03-21 17:23     ` Julien Grall
2014-03-26 12:29       ` Vijay Kilari
2014-03-26 14:47         ` Julien Grall
2014-03-27  5:40           ` Vijay Kilari
2014-03-27 15:02             ` Julien Grall
2014-04-01  9:34               ` Vijay Kilari
2014-04-01 11:00                 ` Julien Grall
2014-04-01 12:32                   ` Vijay Kilari
2014-04-01 12:44                     ` Ian Campbell
2014-04-01 12:51                     ` Julien Grall
2014-04-01 13:05                       ` Vijay Kilari
2014-04-01 13:56                         ` Julien Grall
2014-03-19 14:17 ` [RFC PATCH v1 03/10] xen/arm: move vgic data to vgic driver vijay.kilari
2014-03-20 13:51   ` Julien Grall
2014-03-21 17:23     ` Ian Campbell
2014-03-22  9:20       ` Vijay Kilari
2014-03-24 10:57         ` Ian Campbell
2014-03-26 11:44           ` Vijay Kilari
2014-03-26 12:00             ` Ian Campbell
2014-03-26 12:42               ` Vijay Kilari
2014-03-22  9:17     ` Vijay Kilari
2014-03-20 17:14   ` Stefano Stabellini
2014-03-20 17:56     ` Julien Grall
2014-03-20 18:11       ` Stefano Stabellini
2014-03-21  9:22         ` Ian Campbell
2014-03-19 14:17 ` [RFC PATCH v1 04/10] arm/xen: move gic save and restore registers to gic driver vijay.kilari
2014-03-20 15:22   ` Julien Grall
2014-03-21 17:26     ` Ian Campbell
2014-03-22  9:22     ` Vijay Kilari
2014-03-20 17:23   ` Stefano Stabellini
2014-03-21 17:28     ` Ian Campbell
2014-03-22  9:27     ` Vijay Kilari
2014-03-19 14:17 ` [RFC PATCH v1 05/10] xen/arm: move gic definitions to seperate file vijay.kilari
2014-03-20 15:13   ` Julien Grall
2014-03-19 14:17 ` [RFC PATCH v1 06/10] xen/arm: split gic driver into generic and gicv2 driver vijay.kilari
2014-03-20 11:55   ` Stefano Stabellini
2014-03-22  9:32     ` Vijay Kilari
2014-03-23 14:43       ` Julien Grall
2014-03-24 11:01         ` Ian Campbell
2014-03-20 16:02   ` Julien Grall
2014-03-21 17:32     ` Ian Campbell
2014-03-21 17:37       ` Julien Grall
2014-03-22  9:40     ` Vijay Kilari
2014-03-23 15:05       ` Julien Grall
2014-03-20 16:39   ` Stefano Stabellini
2014-03-21 17:38   ` Ian Campbell
2014-03-22  9:59     ` Vijay Kilari
2014-03-24 11:06       ` Ian Campbell
2014-03-19 14:17 ` [RFC PATCH v1 07/10] xen/arm: split vgic into generic and GIC v2 specific drivers vijay.kilari
2014-03-19 14:17 ` [RFC PATCH v1 08/10] xen/arm: Add support for GIC v3 vijay.kilari
2014-03-20 12:37   ` Stefano Stabellini
2014-03-22 10:07     ` Vijay Kilari
2014-03-24 11:28       ` Ian Campbell
2014-03-24 17:01       ` Stefano Stabellini
2014-03-26 13:16         ` Vijay Kilari
2014-03-26 17:22           ` Stefano Stabellini
2014-03-20 16:40   ` Julien Grall
2014-03-22 10:21     ` Vijay Kilari
2014-03-23 14:49       ` Julien Grall
2014-03-24 11:26         ` Ian Campbell
2014-03-24 11:50           ` Julien Grall
2014-03-24 17:02       ` Stefano Stabellini
2014-03-19 14:17 ` [RFC PATCH v1 09/10] xen/arm: Add vgic " vijay.kilari
2014-03-20 12:38   ` Stefano Stabellini
2014-03-19 14:17 ` [RFC PATCH v1 10/10] xen/arm: GICv3 device tree parsing vijay.kilari
2014-03-20 16:08   ` Julien Grall
2014-03-22 10:30     ` Vijay Kilari
2014-03-24 11:43       ` Ian Campbell
2014-03-24 12:03         ` Julien Grall
2014-03-24 12:07           ` Ian Campbell
2014-03-24 12:08           ` Julien Grall
2014-03-24 17:34             ` Stefano Stabellini
2014-03-24 18:00               ` Julien Grall [this message]
2014-03-25 11:04                 ` Stefano Stabellini
2014-03-25 12:33                   ` Julien Grall
2014-03-25 12:34                     ` Julien Grall
2014-04-01 12:59                     ` Ian Campbell
2014-04-01 13:07                       ` Julien Grall
2014-03-20 11:55 ` [RFC PATCH v1 00/10] xen/arm: Add GICv3 support Stefano Stabellini

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=533072DB.8040302@linaro.org \
    --to=julien.grall@linaro.org \
    --cc=Ian.Campbell@citrix.com \
    --cc=Prasun.Kapoor@caviumnetworks.com \
    --cc=stefano.stabellini@citrix.com \
    --cc=stefano.stabellini@eu.citrix.com \
    --cc=vijay.kilari@gmail.com \
    --cc=vijaya.kumar@caviumnetworks.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.