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From: Mirela Simonovic <mirela.simonovic@aggios.com>
To: Julien Grall <julien.grall@arm.com>
Cc: "Edgar E. Iglesias" <edgar.iglesias@xilinx.com>,
	Xen Devel <xen-devel@lists.xen.org>,
	Stefano Stabellini <sstabellini@kernel.org>,
	Davorin Mista <dm@aggios.com>,
	Dario Faggioli <dfaggioli@suse.com>
Subject: Re: [PATCH v3 10/10] xen/arm: Enable errata for secondary CPU on hotplug after the boot
Date: Thu, 10 May 2018 16:12:55 +0200	[thread overview]
Message-ID: <CAKPH-NjPpBmOgEZr9C_DUzOkXtcQT24b3hC8xVFj0R=ns+HkfA@mail.gmail.com> (raw)
In-Reply-To: <eec66fbe-5faa-3213-182a-5de560a52d46@arm.com>

Hi Julien,

On Thu, May 10, 2018 at 3:29 PM, Julien Grall <julien.grall@arm.com> wrote:
> Hi,
>
> On 05/10/2018 02:24 PM, Mirela Simonovic wrote:
>>
>> On Thu, May 10, 2018 at 1:57 PM, Mirela Simonovic
>> <mirela.simonovic@aggios.com> wrote:
>
>
>> I have tested the tuned scenario where enabling capabilities fails -
>> the erroneous CPU is stopped/powered down and the system continues to
>> work fine without it. Although I still don't understand why indeed I
>> needed to debug this I'll add the fix in v4.
>
>
> I don't understand your last sentence. What did you mean?
>

I still don't understand how can this scenario happen practically at
runtime (a scenario without me tuning the failure for testing). Memory
allocation failure shouldn't be possible at this point and any
workaround related failure would have happened at boot. I don't see
anything else or my understanding may not be correct...
However, if some new capability would be introduced one day and it
could fail, it would be good if we don't have to go back and fix this
patch.
At the end, it doesn't matter since the system will be able to
properly deal with such a scenario with the fix.

Thanks,
Mirela

> Cheers,
>
> --
> Julien Grall

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  reply	other threads:[~2018-05-10 14:12 UTC|newest]

Thread overview: 53+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-04-27 17:12 [PATCH v3 00/10] xen/arm64: Suspend preconditions and CPU hotplug fixes Mirela Simonovic
2018-04-27 17:12 ` [PATCH v3 01/10] xen/arm64: Added handling of the trapped access to OSLSR register Mirela Simonovic
2018-04-27 17:12 ` [PATCH v3 02/10] xen/arm: Ignore write to GICD_ISACTIVERn registers (vgic-v2) Mirela Simonovic
2018-04-30 14:32   ` Julien Grall
2018-04-27 17:12 ` [PATCH v3 03/10] xen/arm: Implement CPU_OFF PSCI call (physical interface) Mirela Simonovic
2018-04-30 14:36   ` Julien Grall
2018-04-27 17:12 ` [PATCH v3 04/10] xen/arm: Remove __initdata and __init to enable CPU hotplug Mirela Simonovic
2018-04-27 17:12 ` [PATCH v3 05/10] xen/arm: Setup virtual paging for non-boot CPUs on hotplug/resume Mirela Simonovic
2018-04-30 14:47   ` Julien Grall
2018-05-07 14:55     ` Mirela Simonovic
2018-05-08 14:14       ` Julien Grall
2018-05-08 14:28         ` Mirela Simonovic
2018-05-09 10:32           ` Julien Grall
2018-04-27 17:12 ` [PATCH v3 06/10] xen/common: Restore IRQ affinity when hotplugging a pCPU Mirela Simonovic
2018-05-10  7:33   ` Dario Faggioli
2018-04-27 17:12 ` [PATCH v3 07/10] xen/arm: Release maintenance interrupt when CPU is hot-unplugged Mirela Simonovic
2018-04-30 14:51   ` Julien Grall
2018-04-27 17:12 ` [PATCH v3 08/10] xen/arm: Release timer interrupts " Mirela Simonovic
2018-04-30 15:58   ` Julien Grall
2018-05-07 15:33     ` Mirela Simonovic
2018-04-27 17:12 ` [PATCH v3 09/10] xen/arm: Free memory allocated for sibling/core maps on CPU hot-unplug Mirela Simonovic
2018-04-30 15:55   ` Julien Grall
2018-04-27 17:12 ` [PATCH v3 10/10] xen/arm: Enable errata for secondary CPU on hotplug after the boot Mirela Simonovic
2018-04-30 16:09   ` Julien Grall
2018-05-09 15:48     ` Mirela Simonovic
2018-05-09 16:32       ` Julien Grall
2018-05-10 11:57         ` Mirela Simonovic
2018-05-10 13:24           ` Mirela Simonovic
2018-05-10 13:29             ` Julien Grall
2018-05-10 14:12               ` Mirela Simonovic [this message]
2018-05-10 14:35                 ` Julien Grall
2018-05-10 14:25             ` Dario Faggioli
2018-05-10 15:00               ` Mirela Simonovic
2018-05-10 15:13                 ` Julien Grall
2018-05-10 15:49                   ` Mirela Simonovic
2018-05-10 16:02                     ` Julien Grall
2018-05-10 16:21                       ` Dario Faggioli
2018-05-10 16:24                     ` Dario Faggioli
2018-05-11 10:41                       ` Mirela Simonovic
2018-05-11 10:54                         ` Julien Grall
2018-05-11 12:07                           ` Mirela Simonovic
2018-05-11 12:20                             ` Mirela Simonovic
2018-05-11 13:08                               ` Julien Grall
2018-05-11 13:31                                 ` Dario Faggioli
     [not found]                                   ` <CAKPH-Nj2znmdcjZEfFf83WmrcBS_u4R33yPOxAPWw37RHVZ38g@mail.gmail.com>
2018-05-11 14:14                                     ` Dario Faggioli
2018-05-11 21:47                                   ` Stefano Stabellini
2018-05-14  9:44                                     ` Julien Grall
2018-05-14 16:59                                       ` Stefano Stabellini
2018-05-15 11:45                                         ` Mirela Simonovic
2018-05-11 13:12                           ` Dario Faggioli
2018-05-11 13:01                         ` Dario Faggioli
2018-05-10 16:12                   ` Dario Faggioli
2018-05-10 13:33           ` Dario Faggioli

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