From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jan Kiszka Subject: Re: [PATCH v2 16/17] kvm: x86: Rework identity map and TSS setup for larger BIOS sizes Date: Mon, 03 Jan 2011 18:19:23 +0100 Message-ID: <4D22051B.5030600@web.de> References: <4D21F416.9090300@redhat.com> <4D21FECD.9000103@web.de> <4D220085.3040200@redhat.com> Mime-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="------------enig23321C7BEE00E58F14775042" Cc: Marcelo Tosatti , kvm@vger.kernel.org, qemu-devel@nongnu.org, Jan Kiszka To: Avi Kivity Return-path: Received: from fmmailgate02.web.de ([217.72.192.227]:59520 "EHLO fmmailgate02.web.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751198Ab1ACRT0 (ORCPT ); Mon, 3 Jan 2011 12:19:26 -0500 In-Reply-To: <4D220085.3040200@redhat.com> Sender: kvm-owner@vger.kernel.org List-ID: This is an OpenPGP/MIME signed message (RFC 2440 and 3156) --------------enig23321C7BEE00E58F14775042 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Am 03.01.2011 17:59, Avi Kivity wrote: > On 01/03/2011 06:52 PM, Jan Kiszka wrote: >> Am 03.01.2011 17:06, Avi Kivity wrote: >> > On 01/03/2011 10:33 AM, Jan Kiszka wrote: >> >> From: Jan Kiszka >> >> >> >> First of all, we only need this EPT identity and TSS reservation o= n >> >> Intel CPUs. >> > >> > kvm-amd will ignore it just fine. I'd like to keep arch difference= s >> > away from userspace. >> >> And I would prefer to avoid needlessly cluttering the physical guest >> address space where not needed. Long term, we could even give user spa= ce >> a hint (unless it can test it directly) that this workaround is no >> longer needed as the host Intel CPU supports true real mode. >=20 > Having different physical address spaces based on the host cpu is bad, > even disregarding live migration. If there's a real need, we can do it= > as an option. I don't see such a need though. I see, migration is a killer argument. Jan --------------enig23321C7BEE00E58F14775042 Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.15 (GNU/Linux) Comment: Using GnuPG with SUSE - http://enigmail.mozdev.org/ iEYEARECAAYFAk0iBRsACgkQitSsb3rl5xQMXQCeK9Ml2P2ywkk9oGOdhb1fJLU4 PcsAn3A1nzhqnX0QQ9bgNm3LROwiEqn3 =wZFT -----END PGP SIGNATURE----- --------------enig23321C7BEE00E58F14775042--