From: julien.grall@citrix.com (Julien Grall)
To: linux-arm-kernel@lists.infradead.org
Subject: [Xen-devel] xen,arm: enable cpu_hotplug
Date: Fri, 16 Oct 2015 16:45:55 +0100 [thread overview]
Message-ID: <56211BB3.9020605@citrix.com> (raw)
In-Reply-To: <alpine.DEB.2.02.1510161635520.27957@kaball.uk.xensource.com>
On 16/10/15 16:41, Stefano Stabellini wrote:
> It is possible to shut down cpu1 (psci->cpu_off, which pauses the vcpu)
> but it is not possible to remove cpu1 without removing cpu2 first.
>
> If the user configures the target to be cpu 2-4, then shuts down cpu2, it
> won't receive any interrupts any more. This is not a cpu-hotplug bug.
> Maybe is a do_psci_cpu_off bug, which should be improved to handle this
> case.
It's neither a PSCI cpu off bug. It's a bug in our vGIC implementation.
Regards,
--
Julien Grall
WARNING: multiple messages have this Message-ID (diff)
From: Julien Grall <julien.grall@citrix.com>
To: Stefano Stabellini <stefano.stabellini@eu.citrix.com>,
Ian Campbell <ian.campbell@citrix.com>
Cc: xen-devel@lists.xensource.com, linux-arm-kernel@lists.infradead.org
Subject: Re: [Xen-devel] xen,arm: enable cpu_hotplug
Date: Fri, 16 Oct 2015 16:45:55 +0100 [thread overview]
Message-ID: <56211BB3.9020605@citrix.com> (raw)
In-Reply-To: <alpine.DEB.2.02.1510161635520.27957@kaball.uk.xensource.com>
On 16/10/15 16:41, Stefano Stabellini wrote:
> It is possible to shut down cpu1 (psci->cpu_off, which pauses the vcpu)
> but it is not possible to remove cpu1 without removing cpu2 first.
>
> If the user configures the target to be cpu 2-4, then shuts down cpu2, it
> won't receive any interrupts any more. This is not a cpu-hotplug bug.
> Maybe is a do_psci_cpu_off bug, which should be improved to handle this
> case.
It's neither a PSCI cpu off bug. It's a bug in our vGIC implementation.
Regards,
--
Julien Grall
next prev parent reply other threads:[~2015-10-16 15:45 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-10-14 17:49 xen,arm: enable cpu_hotplug Stefano Stabellini
2015-10-14 17:49 ` Stefano Stabellini
2015-10-14 17:49 ` [PATCH 1/3] xen/arm: Enable cpu_hotplug.c Stefano Stabellini
2015-10-14 17:49 ` Stefano Stabellini
2015-10-14 18:05 ` [Xen-devel] " Konrad Rzeszutek Wilk
2015-10-14 18:05 ` Konrad Rzeszutek Wilk
2015-10-14 18:17 ` Stefano Stabellini
2015-10-14 18:17 ` Stefano Stabellini
2015-10-16 15:21 ` Stefano Stabellini
2015-10-16 15:21 ` Stefano Stabellini
2015-10-14 22:51 ` Julien Grall
2015-10-14 22:51 ` Julien Grall
2015-10-16 15:23 ` Stefano Stabellini
2015-10-16 15:23 ` Stefano Stabellini
2015-10-14 17:49 ` [PATCH 2/3] xen, cpu_hotplug: call device_offline instead of cpu_down Stefano Stabellini
2015-10-14 17:49 ` Stefano Stabellini
2015-10-14 17:49 ` [PATCH 3/3] xen/arm: don't try to re-register vcpu_info on cpu_hotplug Stefano Stabellini
2015-10-14 17:49 ` Stefano Stabellini
2015-10-14 22:32 ` Julien Grall
2015-10-14 22:32 ` Julien Grall
2015-10-16 15:31 ` Stefano Stabellini
2015-10-16 15:31 ` Stefano Stabellini
2015-10-14 23:23 ` xen,arm: enable cpu_hotplug Julien Grall
2015-10-14 23:23 ` Julien Grall
2015-10-15 8:39 ` [Xen-devel] " Ian Campbell
2015-10-15 8:39 ` Ian Campbell
2015-10-15 9:57 ` Julien Grall
2015-10-15 9:57 ` Julien Grall
2015-10-15 9:58 ` Julien Grall
2015-10-15 9:58 ` Julien Grall
2015-10-16 15:44 ` Stefano Stabellini
2015-10-16 15:44 ` Stefano Stabellini
2015-10-16 15:41 ` Stefano Stabellini
2015-10-16 15:41 ` Stefano Stabellini
2015-10-16 15:45 ` Julien Grall [this message]
2015-10-16 15:45 ` Julien Grall
2015-10-16 15:45 ` Stefano Stabellini
2015-10-16 15:45 ` Stefano Stabellini
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