From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932533AbeCEB5A (ORCPT ); Sun, 4 Mar 2018 20:57:00 -0500 Received: from mga14.intel.com ([192.55.52.115]:39574 "EHLO mga14.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932119AbeCEB45 (ORCPT ); Sun, 4 Mar 2018 20:56:57 -0500 X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.47,425,1515484800"; d="scan'208";a="21986063" From: Luwei Kang To: kvm@vger.kernel.org Cc: tglx@linutronix.de, mingo@redhat.com, hpa@zytor.com, x86@kernel.org, pbonzini@redhat.com, rkrcmar@redhat.com, linux-kernel@vger.kernel.org, joro@8bytes.org, Luwei Kang Subject: [PATCH v5 03/11] perf/x86/intel/pt: Introduce a new function to get the capability of Intel PT Date: Sun, 4 Mar 2018 20:07:13 +0800 Message-Id: <1520165241-15819-4-git-send-email-luwei.kang@intel.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1520165241-15819-1-git-send-email-luwei.kang@intel.com> References: <1520165241-15819-1-git-send-email-luwei.kang@intel.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Because of the guest CPUID information may diffrent with with host(some bits may mask off in guest) so introduce a new function pt_cap_get_ex() to get the capability of Intel PT. Signed-off-by: Luwei Kang --- arch/x86/events/intel/pt.c | 10 ++++++++++ arch/x86/include/asm/intel_pt.h | 2 ++ 2 files changed, 12 insertions(+) diff --git a/arch/x86/events/intel/pt.c b/arch/x86/events/intel/pt.c index d89dd8c..817104e 100644 --- a/arch/x86/events/intel/pt.c +++ b/arch/x86/events/intel/pt.c @@ -86,6 +86,16 @@ u32 pt_cap_get(enum pt_capabilities cap) } EXPORT_SYMBOL_GPL(pt_cap_get); +u32 pt_cap_get_ex(u32 *caps, enum pt_capabilities cap) +{ + struct pt_cap_desc *cd = &pt_caps[cap]; + u32 c = caps[cd->leaf * PT_CPUID_REGS_NUM + cd->reg]; + unsigned int shift = __ffs(cd->mask); + + return (c & cd->mask) >> shift; +} +EXPORT_SYMBOL_GPL(pt_cap_get_ex); + static ssize_t pt_cap_show(struct device *cdev, struct device_attribute *attr, char *buf) diff --git a/arch/x86/include/asm/intel_pt.h b/arch/x86/include/asm/intel_pt.h index 2de4db0..486e11f 100644 --- a/arch/x86/include/asm/intel_pt.h +++ b/arch/x86/include/asm/intel_pt.h @@ -27,9 +27,11 @@ enum pt_capabilities { #if defined(CONFIG_PERF_EVENTS) && defined(CONFIG_CPU_SUP_INTEL) void cpu_emergency_stop_pt(void); extern u32 pt_cap_get(enum pt_capabilities cap); +extern u32 pt_cap_get_ex(u32 *caps, enum pt_capabilities cap); #else static inline void cpu_emergency_stop_pt(void) {} static inline u32 pt_cap_get(enum pt_capabilities cap) { return 0; } +static u32 pt_cap_get_ex(u32 *caps, enum pt_capabilities cap) { return 0; } #endif #endif /* _ASM_X86_INTEL_PT_H */ -- 1.8.3.1