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Re: [Xen-devel] [PATCH v2] xen/pvhsim: fix cpu onlining


  • To: Juergen Gross <jgross@xxxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxxx>
  • From: George Dunlap <george.dunlap@xxxxxxxxxx>
  • Date: Wed, 23 Oct 2019 15:11:45 +0100
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  • Cc: Wei Liu <wl@xxxxxxx>, George Dunlap <george.dunlap@xxxxxxxxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Dario Faggioli <dfaggioli@xxxxxxxx>, Jan Beulich <jbeulich@xxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>
  • Delivery-date: Wed, 23 Oct 2019 14:11:53 +0000
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  • List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
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On 10/23/19 2:59 PM, Juergen Gross wrote:
> Since commit 8d3c326f6756d1 ("xen: let vcpu_create() select processor")
> the initial processor for all pv-shim vcpus will be 0, as no other cpus
> are online when the vcpus are created. Before that commit the vcpus
> would have processors set not being online yet, which worked just by
> chance.
> 
> When the pv-shim vcpu becomes active it will have a hard affinity
> not matching its initial processor assignment leading to failing
> ASSERT()s or other problems depending on the selected scheduler.
> 
> Fix that by doing the affinity setting after onlining the cpu but
> before taking the vcpu up. For vcpu 0 this is still in
> sched_setup_dom0_vcpus(), for the other vcpus setting the affinity
> there can be dropped.

I kinda feel like the issue here was that v->processor wasn't re-set
when the vcpu was brought up; but anyway this works:

Acked-by: George Dunlap <george.dunlap@xxxxxxxxxx>


I think this gives it all the acks it needs?

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