Re: [Xen-devel] [PATCH v3 06/10] xen/common: Restore IRQ affinity when hotplugging a pCPU

[Dario Faggioli <dfaggioli@xxxxxxxx>]

On Fri, 2018-04-27 at 19:12 +0200, Mirela Simonovic wrote:
> Non-boot pCPUs are being hot-unplugged during the system suspend to
> RAM and hotplugged during the resume. When non-boot pCPUs are
> hot-unplugged the interrupts that were targeted to them are migrated
> to the boot pCPU.
> On suspend, each guest could have its own wake-up devices/interrupts
> (passthrough) that could trigger the system resume. These interrupts
> could be targeted to a non-boot pCPU, e.g. if the guest's vCPU is
> pinned to a non-boot pCPU. Due to the hot-unplug of non-boot pCPUs
> during the suspend such interrupts will be migrated from non-boot
> pCPUs
> to the boot pCPU (this is fine). However, when non-boot pCPUs are
> hotplugged on resume, these interrupts are not migrated back to non-
> boot
> pCPUs, i.e. IRQ affinity is not restored on resume (this is wrong).
> This patch adds the restoration of IRQ affinity when a pCPU is
> hotplugged.
> 
> Signed-off-by: Mirela Simonovic <mirela.simonovic@xxxxxxxxxx>
> 
> ---
> CC: George Dunlap <george.dunlap@xxxxxxxxxxxxx>
> CC: Dario Faggioli <dfaggioli@xxxxxxxx>
>
Reviewed-by: Dario Faggioli <dfaggioli@xxxxxxxx>

Regards,
Dario
-- 
<<This happens because I choose it to happen!>> (Raistlin Majere)
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Dario Faggioli, Ph.D, http://about.me/dario.faggioli
Software Engineer @ SUSE https://www.suse.com/

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