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Re: [Xen-devel] [PATCH 1/2] xen/sched: fix locking in restore_vcpu_affinity()
- To: Jan Beulich <JBeulich@xxxxxxxx>, Juergen Gross <JGross@xxxxxxxx>
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Tue, 23 Jul 2019 13:50:39 +0100
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- Cc: George Dunlap <george.dunlap@xxxxxxxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>, Dario Faggioli <dfaggioli@xxxxxxxx>
- Delivery-date: Tue, 23 Jul 2019 12:50:49 +0000
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On 23/07/2019 13:08, Jan Beulich wrote:
> On 23.07.2019 11:20, Juergen Gross wrote:
>> --- a/xen/common/schedule.c
>> +++ b/xen/common/schedule.c
>> @@ -708,6 +708,8 @@ void restore_vcpu_affinity(struct domain *d)
>> * set v->processor of each of their vCPUs to something that will
>> * make sense for the scheduler of the cpupool in which they are
>> in.
>> */
>> + lock = vcpu_schedule_lock_irq(v);
>> +
>> cpumask_and(cpumask_scratch_cpu(cpu), v->cpu_hard_affinity,
>> cpupool_domain_cpumask(d));
>> if ( cpumask_empty(cpumask_scratch_cpu(cpu)) )
>> @@ -731,6 +733,9 @@ void restore_vcpu_affinity(struct domain *d)
>>
>> v->processor = cpumask_any(cpumask_scratch_cpu(cpu));
>>
>> + spin_unlock_irq(lock);
>> +
>> + /* v->processor might have changed, so reacquire the lock. */
> Whoever commits this (perhaps me, later today) will want to replace
> the hard tab here.
I've already committed this, and did fix up the tab.
~Andrew
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