Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754963AbdDRGds (ORCPT ); Tue, 18 Apr 2017 02:33:48 -0400 Received: from mx2.suse.de ([195.135.220.15]:39900 "EHLO mx1.suse.de" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1753203AbdDRGb0 (ORCPT ); Tue, 18 Apr 2017 02:31:26 -0400 From: Juergen Gross To: linux-kernel@vger.kernel.org, xen-devel@lists.xenproject.org Cc: boris.ostrovsky@oracle.com, Juergen Gross Subject: [PATCH v3 03/11] x86/xen: use capabilities instead of fake cpuid values for aperf Date: Tue, 18 Apr 2017 08:31:11 +0200 Message-Id: <20170418063119.11654-4-jgross@suse.com> X-Mailer: git-send-email 2.12.0 In-Reply-To: <20170418063119.11654-1-jgross@suse.com> References: <20170418063119.11654-1-jgross@suse.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1616 Lines: 49 When running as pv domain xen_cpuid() is being used instead of native_cpuid(). In xen_cpuid() the aperf/mperf feature is indicated as not being present by special casing the related cpuid leaf. Instead of delivering fake cpuid values clear the cpu capability bit for aperf/mperf instead. Signed-off-by: Juergen Gross Reviewed-by: Boris Ostrovsky --- arch/x86/xen/enlighten_pv.c | 9 +-------- 1 file changed, 1 insertion(+), 8 deletions(-) diff --git a/arch/x86/xen/enlighten_pv.c b/arch/x86/xen/enlighten_pv.c index bd69868909b4..4c8cd7278189 100644 --- a/arch/x86/xen/enlighten_pv.c +++ b/arch/x86/xen/enlighten_pv.c @@ -165,9 +165,6 @@ xen_running_on_version_or_later(unsigned int major, unsigned int minor) return false; } -#define CPUID_THERM_POWER_LEAF 6 -#define APERFMPERF_PRESENT 0 - static __read_mostly unsigned int cpuid_leaf1_edx_mask = ~0; static __read_mostly unsigned int cpuid_leaf1_ecx_mask = ~0; @@ -201,11 +198,6 @@ static void xen_cpuid(unsigned int *ax, unsigned int *bx, *dx = cpuid_leaf5_edx_val; return; - case CPUID_THERM_POWER_LEAF: - /* Disabling APERFMPERF for kernel usage */ - maskecx = ~(1 << APERFMPERF_PRESENT); - break; - case 0xb: /* Suppress extended topology stuff */ maskebx = 0; @@ -332,6 +324,7 @@ static void __init xen_init_capabilities(void) setup_clear_cpu_cap(X86_BUG_SYSRET_SS_ATTRS); setup_force_cpu_cap(X86_FEATURE_XENPV); setup_clear_cpu_cap(X86_FEATURE_DCA); + setup_clear_cpu_cap(X86_FEATURE_APERFMPERF); } static void xen_set_debugreg(int reg, unsigned long val) -- 2.12.0