linux-kernel - Re: [PATCH] xen-evtchn: Bind dyn evtchn:qemu-dm interrupt to next online VCPU

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Date:   Mon, 5 Jun 2017 10:54:40 +0100
From:   Anoob Soman <anoob.soman@...rix.com>
To:     Juergen Gross <jgross@...e.com>, <xen-devel@...ts.xenproject.org>,
        <linux-kernel@...r.kernel.org>
CC:     <boris.ostrovsky@...cle.com>
Subject: Re: [PATCH] xen-evtchn: Bind dyn evtchn:qemu-dm interrupt to next
 online VCPU

On 02/06/17 16:10, Juergen Gross wrote:
>
> I'd prefer the to have irq disabled from taking the lock until here.
> This will avoid problems due to preemption and will be faster as it
> avoids one irq on/off cycle. So:
>
> local_irq_disable();
> raw_spin_lock();
> ...
> raw_spin_unlock();
> this_cpu_write();
> xen_rebind_evtchn_to_cpu();
> local_irq_enable();
>
>
> Juergen


Agreed, I will send a V2 with your suggestion.


-Anoob.