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
next prev parent 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
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