From: David Vrabel <david.vrabel@citrix.com>
To: "Jason A. Donenfeld" <Jason@zx2c4.com>,
David Vrabel <david.vrabel@citrix.com>
Cc: <netdev@vger.kernel.org>,
Paul McKenney <paulmck@linux.vnet.ibm.com>,
<linux-kernel@vger.kernel.org>, <xen-devel@lists.xen.org>
Subject: Re: [Xen-devel] printk from softirq on xen: hard lockup
Date: Thu, 6 Aug 2015 11:02:47 +0100 [thread overview]
Message-ID: <55C330C7.6050204@citrix.com> (raw)
In-Reply-To: <CAHmME9r6yYyiRXD7hyyvZnk9CvNAxgG5MSb=F=smSV6+j_U_FQ@mail.gmail.com>
On 05/08/15 00:01, Jason A. Donenfeld wrote:
> Hey David,
>
> Sorry for the premature response on my phone earlier. Real reply follows.
>>> rcu_read_lock, when using Xen PV. Relevant excerpts of the
>> ^^ PV guest?
>
> Yes. The lockup occurs on a PV guest. Nothing special at all about the
> configuration. Vanilla upstream 4.1.3 kernel.
>
>>> __xapic_wait_icr_idle () at ./arch/x86/include/asm/ipi.h:56
>>> 56 while (native_apic_mem_read(APIC_ICR) & APIC_ICR_BUSY)
>> ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ => HVM guest
>>
>> Which is it?
>
> That's odd. It's a PV guest, not an HVM nor PVH guest.
Linux PV guests must use the "Xen PV" APIC driver. You need to
investigate why your PV guest is not using this (although I'm surprised
it works at all with the wrong one).
David
next prev parent reply other threads:[~2015-08-06 10:02 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-08-04 16:41 printk from softirq on xen: hard lockup Jason A. Donenfeld
2015-08-04 17:12 ` [Xen-devel] " David Vrabel
2015-08-04 17:45 ` Jason A. Donenfeld
2015-08-04 23:01 ` [Xen-devel] " Jason A. Donenfeld
2015-08-06 10:02 ` David Vrabel [this message]
2015-08-06 15:58 ` Jason A. Donenfeld
2015-08-06 16:10 ` David Vrabel
2015-08-06 16:21 ` Jason A. Donenfeld
2015-08-06 16:29 ` [PATCH] xen-apic: Enable on domU as well Jason A. Donenfeld
2015-08-06 16:37 ` [PATCH v2] " Jason A. Donenfeld
2015-08-07 14:23 ` [Xen-devel] " Konrad Rzeszutek Wilk
2015-08-07 14:37 ` Jason A. Donenfeld
2015-08-10 13:40 ` [PATCH v3] " Jason A. Donenfeld
2015-08-10 13:41 ` David Vrabel
2015-08-10 13:44 ` Jason A. Donenfeld
2015-08-11 10:46 ` [Xen-devel] " David Vrabel
2015-08-05 16:37 ` [Xen-devel] printk from softirq on xen: hard lockup Jason A. Donenfeld
2015-08-06 8:22 ` Ian Campbell
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