From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jan Kiszka Subject: Re: x2apic issues with Solaris and Xen guests Date: Mon, 20 Apr 2015 19:29:24 +0200 Message-ID: <55353774.6070408@web.de> References: Mime-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="9rgJobxbf3gKVLD22CNpiv4EvnaOiUwmd" Cc: Paolo Bonzini , Michael Tokarev , Eduardo Habkost To: Stefan Hajnoczi , kvm Return-path: Received: from mout.web.de ([212.227.15.4]:51286 "EHLO mout.web.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751024AbbDTR3k (ORCPT ); Mon, 20 Apr 2015 13:29:40 -0400 In-Reply-To: Sender: kvm-owner@vger.kernel.org List-ID: This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --9rgJobxbf3gKVLD22CNpiv4EvnaOiUwmd Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable On 2015-04-20 19:07, Stefan Hajnoczi wrote: > I wonder whether the following two x2apic issues are related: >=20 > Solaris 10 U11 network doesn't work > https://bugzilla.redhat.com/show_bug.cgi?id=3D1040500 >=20 > kvm - fails to setup timer interrupt via io-apic > (Thanks to Michael Tokarev for posting this link) > https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=3D528077#68 >=20 > It seems KVM's x2apic emulation works with regular Linux and Windows > guests, but not necessarily with other OSes. KVM's x2apic is kind of paravirtual - without VT-d interrupt remapping. That may confuse the guest, though it should work. But Xen already refuses to pick it according to the second report: | (XEN) Not enabling x2APIC: depends on iommu_supports_eim. >=20 > Has anyone looked into this? Not yet. Is there a handy reproduction guest image? Or maybe someone would like to start with tracing what the guest and the host do. Jan --9rgJobxbf3gKVLD22CNpiv4EvnaOiUwmd 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 iEYEARECAAYFAlU1N3QACgkQitSsb3rl5xSVlQCg5+nlXS4A/vHLuKBr1+9wBIFa DuwAoNGIrB/SWQAFeyN9lEm/nQ1Glc7S =3MjO -----END PGP SIGNATURE----- --9rgJobxbf3gKVLD22CNpiv4EvnaOiUwmd--