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Message-ID: <20170628154424.GH30116@char.us.oracle.com>
Date: Wed, 28 Jun 2017 11:44:24 -0400
From: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
To: Vitaly Kuznetsov <vkuznets@...hat.com>
Cc: xen-devel@...ts.xenproject.org, Juergen Gross <jgross@...e.com>,
Boris Ostrovsky <boris.ostrovsky@...cle.com>, x86@...nel.org,
linux-kernel@...r.kernel.org
Subject: Re: [Xen-devel] [PATCH] xen/x86: Don't BUG on CPU0 offlining
On Mon, Jun 26, 2017 at 06:39:30PM +0200, Vitaly Kuznetsov wrote:
> CONFIG_BOOTPARAM_HOTPLUG_CPU0 allows to offline CPU0 but Xen HVM guests
> BUG() in xen_teardown_timer(). Remove the BUG_ON(), this is probably a
> leftover from ancient times when CPU0 hotplug was impossible, it works
> just fine for HVM.
>
> Signed-off-by: Vitaly Kuznetsov <vkuznets@...hat.com>
Perhaps:
BUG_ON(cpu == 0 && xen_pv_domain());
?
> ---
> - CPU0 hotplug is currently broken on x86, see
> https://lkml.org/lkml/2017/6/26/529
> ---
> arch/x86/xen/time.c | 1 -
> 1 file changed, 1 deletion(-)
>
> diff --git a/arch/x86/xen/time.c b/arch/x86/xen/time.c
> index a1895a8..1ecb05d 100644
> --- a/arch/x86/xen/time.c
> +++ b/arch/x86/xen/time.c
> @@ -309,7 +309,6 @@ static irqreturn_t xen_timer_interrupt(int irq, void *dev_id)
> void xen_teardown_timer(int cpu)
> {
> struct clock_event_device *evt;
> - BUG_ON(cpu == 0);
> evt = &per_cpu(xen_clock_events, cpu).evt;
>
> if (evt->irq >= 0) {
> --
> 2.9.4
>
>
> _______________________________________________
> Xen-devel mailing list
> Xen-devel@...ts.xen.org
> https://lists.xen.org/xen-devel
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