From mboxrd@z Thu Jan  1 00:00:00 1970
From: Julien Grall <julien.grall@linaro.org>
Subject: Re: [PATCH-4.5 3/4] xen/arm: do not request
	maintenance_interrupts
Date: Fri, 07 Feb 2014 23:10:03 +0000
Message-ID: <52F567CB.7080302@linaro.org>
References: <alpine.DEB.2.02.1402071847430.4373@kaball.uk.xensource.com>
	<1391799378-31664-3-git-send-email-stefano.stabellini@eu.citrix.com>
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To: Stefano Stabellini <stefano.stabellini@eu.citrix.com>, xen-devel@lists.xensource.com
Cc: julien.grall@citrix.com, Ian.Campbell@citrix.com
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On 07/02/14 18:56, Stefano Stabellini wrote:
    > +static void gic_clear_lrs(struct vcpu *v)
> +{
> +    struct pending_irq *p;
> +    int i = 0, irq;
> +    uint32_t lr;
> +    bool_t inflight;
> +
> +    ASSERT(!local_irq_is_enabled());
> +
> +    while ((i = find_next_bit((const long unsigned int *) &this_cpu(lr_mask),
> +                              nr_lrs, i)) < nr_lrs) {

Did you look at to ELRSR{0,1} registers which list the usable LRs? I 
think you can use it with the this_cpu(lr_mask) to avoid browsing every LRs.

-- 
Julien Grall