From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Woodhouse, David" Subject: Re: [PATCH 2/3] xen: set cpu capabilities from xen_start_kernel() Date: Wed, 11 Jul 2018 09:54:17 +0000 Message-ID: <1531302856.8759.28.camel@amazon.co.uk> References: <20180530110958.19413-1-jgross@suse.com> <20180530110958.19413-3-jgross@suse.com> <1531300502.8759.24.camel@amazon.co.uk> Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="===============8534271069403898034==" Return-path: Received: from us1-rack-dfw2.inumbo.com ([104.130.134.6]) by lists.xenproject.org with esmtp (Exim 4.89) (envelope-from ) id 1fdBpH-0006mg-OL for xen-devel@lists.xenproject.org; Wed, 11 Jul 2018 09:54:23 +0000 In-Reply-To: MIME-Version: 1.0 List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-devel-bounces@lists.xenproject.org Sender: "Xen-devel" To: "jgross@suse.com" , "stable@vger.kernel.org" , "xen-devel@lists.xenproject.org" Cc: "boris.ostrovsky@oracle.com" , "Veith, Simon" List-Id: xen-devel@lists.xenproject.org --===============8534271069403898034== Content-Language: en-US Content-Type: multipart/signed; micalg=sha-256; protocol="application/x-pkcs7-signature"; boundary="=-sQ7IaZBgsGHWhuMpB/Ui" --=-sQ7IaZBgsGHWhuMpB/Ui Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Wed, 2018-07-11 at 11:46 +0200, Juergen Gross wrote: > On 11/07/18 11:15, Woodhouse, David wrote: > >=20 > > On Wed, 2018-05-30 at 13:09 +0200, Juergen Gross wrote: > > >=20 > > > There is no need to set the same capabilities for each cpu > > > individually. This can easily be done for all cpus when starting the > > > kernel. > > >=20 > > > Upstream commit: 0808e80cb760de2733c0527d2090ed2205a1eef8 ("xen: set > > > cpu capabilities from xen_start_kernel()") > > >=20 > > > Signed-off-by: Juergen Gross > > > Reviewed-by: Boris Ostrovsky > > That breaks PV guests because they get KAISER enabled =E2=80=94 when > > kaiser_check_boottime_disable() runs, X86_FEATURE_XENPV isn't set. > > Which kernel version are you talking about? >=20 > With upstream commit 60d3450167433f2d099ce2869dc52dd9e7dc9b29 which will > be part of next stable-4.9 everything is fine. Right. That's what Simon had also backported. We hadn't spotted it was already lined up. --=-sQ7IaZBgsGHWhuMpB/Ui Content-Type: application/x-pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgEFADCABgkqhkiG9w0BBwEAAKCCEE4w ggUuMIIEFqADAgECAhEApEtL31g6H7ROXdOiQnA9RjANBgkqhkiG9w0BAQsFADCBlzELMAkGA1UE BhMCR0IxGzAZBgNVBAgTEkdyZWF0ZXIgTWFuY2hlc3RlcjEQMA4GA1UEBxMHU2FsZm9yZDEaMBgG A1UEChMRQ09NT0RPIENBIExpbWl0ZWQxPTA7BgNVBAMTNENPTU9ETyBSU0EgQ2xpZW50IEF1dGhl bnRpY2F0aW9uIGFuZCBTZWN1cmUgRW1haWwgQ0EwHhcNMTcxMjIxMDAwMDAwWhcNMTgxMjIxMjM1 OTU5WjAiMSAwHgYJKoZIhvcNAQkBFhFkd213QGFtYXpvbi5jby51azCCASIwDQYJKoZIhvcNAQEB BQADggEPADCCAQoCggEBAKdGKgXuwKMg2r+i/4BZZC0ddRxNq3xIKTakie/VCSzoO7P17A36ZzUc VMEYPfqDt/65xoc6Tdih+qkY2pNDppZ1DZ8mVrAX6O2O60ZhmXB60wMoDvXPZInvkMOW4drqnje/ 7/NOypn/XQAY+ln4KT+3tHG3TfryyJFMedqC/r29KJlCeeCxIzdtq2j5mN42tvPVv4+p+Kr77uui GOASNdFJbNdgx7UGF+il6kRGSle17LJZKMgRiLJXYjECwnGwdfLdN5SINWD5IC3yXY8d14Bq6DyD 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