From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jan Kiszka Subject: Re: arm: warning at virt/kvm/arm/vgic.c:1468 Date: Sun, 15 Feb 2015 15:40:40 +0100 Message-ID: <54E0AFE8.20202@web.de> References: <54D714B9.6090106@web.de> <20150213044613.GA47577@lvm> <87k2zms4ub.fsf@linaro.org> <87iof6s3o7.fsf@linaro.org> <54E05E8A.5020109@web.de> <87wq3je1o4.fsf@why.wild-wind.fr.eu.org> Mime-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="RoPAbddmhalfQBQvHEGEHIrjpU4SOBhLo" Cc: =?UTF-8?B?QWxleCBCZW5uw6ll?= , Christoffer Dall , kvmarm , kvm , Paolo Bonzini , Wei Huang To: Marc Zyngier Return-path: Received: from mout.web.de ([212.227.17.11]:58610 "EHLO mout.web.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754885AbbBOOk4 (ORCPT ); Sun, 15 Feb 2015 09:40:56 -0500 In-Reply-To: <87wq3je1o4.fsf@why.wild-wind.fr.eu.org> Sender: kvm-owner@vger.kernel.org List-ID: This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --RoPAbddmhalfQBQvHEGEHIrjpU4SOBhLo Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable On 2015-02-15 14:37, Marc Zyngier wrote: > On Sun, Feb 15 2015 at 8:53:30 am GMT, Jan Kiszka = wrote: >> I'm now throwing trace_printk at my broken KVM. Already found out that= I >> get ARM_EXCEPTION_IRQ every few 10 =C2=B5s. Not seeing any irq_* trace= s, >> though. Weird. >=20 > This very much looks like a screaming interrupt. At such a rate, no > wonder your VM make much progress. Can you find out which interrupt is > screaming like this? Looking at GICC_HPPIR should help, but you'll have= > to map the CPU interface in HYP before being able to access it there. OK... let me figure this out. I had this suspect as well - the host gets a VM exit for each injected guest IRQ? BTW, I also tried with in-kernel GIC disabled (in the kernel config), but I guess that's pointless. Linux seems to be stuck on a non-functional architectural timer then, right? >=20 > Do you have an form of power-management on this system? Just killed every config that has PM for FREQ in its name, but that makes no difference. Jan --RoPAbddmhalfQBQvHEGEHIrjpU4SOBhLo Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- Version: GnuPG v2 iEYEARECAAYFAlTgr+gACgkQitSsb3rl5xQIswCfSYdCssxHTEf4cU0rLjdunMEC KFoAn0Y81AcAuFS+0qtAVvTJGdeDJlav =Brps -----END PGP SIGNATURE----- --RoPAbddmhalfQBQvHEGEHIrjpU4SOBhLo--